STARPLUS Starplus DHS-L User manual

Technical Manual
The Answer To Your
Company’s Growing
Communication Needs
DHS-L
TM

STARPLUS®
DHS-L™
Key Telephone System
Technical Manual
Issue 2 - October 2001

Copyright © 2001 VODAVI Technology, Inc.
All Rights Re serve d
This material is copyrighted by VODAVI Technology, Inc., and may be duplicated by Authorized Dealers
only. Any unauthorized reproduct ions, use or discl osure of this materi al , or any par t t hereof, is stri ct ly
prohibited and i s a violation of the Copyright Laws of the United States (17 U.S.C. Section 1 01 et. seq.).
VODAVI reser ves the right to make changes in specifications at any tim e and without notice. The
information furnished by VODAVI in this material is beli eved to be accurate and reliable, but is not
warranted to be true in all cases.
STARPLUS®and DHS-L™ are registered trademarks of VODAVI Technology, Inc.
SEH/2001
Issue ReleaseDate Changes
1 6-00 Initial product release.
2 10-01 Manual content has been updated, andcontains major revisions.
LIFE SUPPORT APPLICATIONS POLICY
VODAVI Technology, Inc.products are not authorized for andshould not be used within Life Support
applications. Life Support systems are equipment intended to support or sustain life and whose failure
toperformwhenproperlyusedinaccordancewithinstructionsprovidedcanbereasonablyexpected
to r esult in significant personal injury or death.
VODAVI Technology, Inc.warranty is limited to replacement of defective components and does not
cover injury topersons or property or other consequential damages.

Contents
1Introduction
Regulatory Information (U.S.A.) ...................................................................................................1-3
Telephone Company Notification ........................................................................................1-3
Incidence of Harm ......................................................................................................................1-3
Changes in Service .....................................................................................................................1-3
Maintenance Limitations .........................................................................................................1-4
Hearing Aid Compatibility ......................................................................................................1-4
UL/CSA Safety Compliance .....................................................................................................1-4
Notice of Compliance ...............................................................................................................1-4
Toll Fraud and DISA Disclaimer ....................................................................................................1-4
2 Description and Installation
DHS-L General Description ............................................................................................................2-3
System Technology ...................................................................................................................2-3
System Components .................................................................................................................2-3
External Compone nts .................................. ......................... ......................... ...........................2-4
System Administration .............................................................................................................2-4
Key Service Unit ..........................................................................................................................2-5
Power Supply ...............................................................................................................................2-7
Main Processing Board (MPB) ................................................................................................2-8
Miscellaneous Service Board (MISB) ....................................................................................2-10
Peripheral Cards .........................................................................................................................2-12
Direct Station Se lector (DSS) Console ...................... ......................... ......................... ........2-17
2-Port Analog Adapter .............................................................................................................2-18
Two-Port Analog Expander ....................................................................................................2-19
DHS-L Technical Specification Tables ........................................................................................2-20
Preparation for DHS-L Installation ..............................................................................................2-26
Installation Overview ................................................................................................................2-26
Ge neral Site Considerations ...................... ......................... ......................... ......................... ..2-27
Necessary Tools and Supplies ...............................................................................................2-28
DHS-L Installation ..............................................................................................................................2-29
System Check-Out .............................................................................................................................2-50
Power Up Sequence ..................................................................................................................2-50
Feature Upgrade Procedure ..........................................................................................................2-51
3 Key Station Features, Operation, and Programming
Ge neral Conventions .............................. ......................... ......................... ......................... ..............3-3
DHS-L Features ............................................................................................................................3-3
Soft Button Prompts .................................................................................................................3-4
Programming ......................................................................................................................................3-4
Using a PC .....................................................................................................................................3-4
Using a Keyset .............................................................................................................................3-5

ii Cont ents
System Programming Tables .................................................................................................3-7
Database Programming Procedural Flow .........................................................................3-34
Feature Code Table ...................................................................................................................3-40
System Numbering Plan ..........................................................................................................3-43
ADP Modular Jack .............................................................................................................................3-44
Alarm Clock ..........................................................................................................................................3-44
Attendant .............................................................................................................................................3-45
Attendant Administration ..............................................................................................................3-46
System Se rvice Mode ................................................................................................................3-46
Automatic Busy Redial (ABR) .........................................................................................................3-47
Background Music ............................................................................................................................3-48
Busy Lamp Field (BLF) ......................................................................................................................3-48
Combination DSS/BLF ..............................................................................................................3-49
Call Abandon ......................................................................................................................................3-49
Call Announce ....................................................................................................................................3-49
Call Back ................................................................................................................................................3-50
Cancel .............................................................................................................................................3-51
Call Discrimination ............................................................................................................................3-52
Override .........................................................................................................................................3-52
Call Forward ........................................................................................................................................3-52
Call Forward Modes ...................................................................................................................3-53
Display ............................................................................................................................................3-53
Busy .................................................................................................................................................3-55
Busy/No Answer .........................................................................................................................3-55
External Call Forward ................................................................................................................3-56
Cancel .............................................................................................................................................3-56
Direct (All Call) .............................................................................................................................3-58
Follow To (from your station) ................................................................................................3-58
Follow Me (from another station) ........................................................................................3-58
Forced Intercom Call Forward ...............................................................................................3-59
No Answer ....................................................................................................................................3-60
Caller Identification (ICLID) ............................................................................................................3-61
Name/ Number Caller ID ..........................................................................................................3-65
Calling Number (SMDR) ...........................................................................................................3-67
Call Park ................................................................................................................................................3-68
Answer ...........................................................................................................................................3-68
Remind ...........................................................................................................................................3-69
Call Pickup ............................................................................................................................................3-69
Direct ..............................................................................................................................................3-70
Group ..............................................................................................................................................3-70
Camp On ...............................................................................................................................................3-70
Busy CO Line ................................................................................................................................3-70
Busy Station .................................................................................................................................3-72
Class of Service (COS) .......................................................................................................................3-73
Day/Night ......................................................................................................................................3-73
Day Class of Service (COS) .......................................................................................................3-73
Night Class of Service (COS) ...................................................................................................3-74

Cont ent s iii
CO Line ..................................................................................................................................................3-74
Assignment ..................................................................................................................................3-74
Connecting Two Systems Using T-1 ....................................................................................3-75
Tenant Group ..............................................................................................................................3-75
Receive Assignment ..................................................................................................................3-76
Automatic Selection ..................................................................................................................3-76
Call Discrimination .....................................................................................................................3-77
Signaling .......................................................................................................................................3-78
Type Assignment .......................................................................................................................3-79
CO-Use Indication .............................................................................................................................3-80
Conference ..........................................................................................................................................3-80
Supervised ....................................................................................................................................3-80
Unsupervised ...............................................................................................................................3-81
Conference Time ........................................................................................................................3-82
Day/Night Service .............................................................................................................................3-83
Dial Pulse to DTMF Conversion ....................................................................................................3-83
Direct Inward System Access (DISA) ...........................................................................................3-84
Distinctive Ringing ............................................................................................................................3-85
Do Not Disturb (DND) ......................................................................................................................3-86
DND Override (Attendant Only) ...........................................................................................3-86
DSS Console ........................................................................................................................................3-87
End-to-End Signaling .......................................................................................................................3-88
Feature Button ...................................................................................................................................3-88
Copy ................................................................................................................................................3-88
Inquiry ............................................................................................................................................3-88
Programming ..............................................................................................................................3-89
Flash .......................................................................................................................................................3-91
Flexible Line Assignment ...............................................................................................................3-92
Flexible Receive Assignment ........................................................................................................3-92
Flexible Ring Assignment ...............................................................................................................3-92
Forced Tone Ringing ........................................................................................................................3-93
Hold ........................................................................................................................................................3-94
Automatic .....................................................................................................................................3-94
Call Abandon (Loop Supervision) ........................................................................................3-94
Call Answer/Select .....................................................................................................................3-95
Exclusive ........................................................................................................................................3-96
Reminder Time ............................................................................................................................3-96
System ............................................................................................................................................3-97
Hot Dial Pad .........................................................................................................................................3-98
Hot Line (Ring Down) .......................................................................................................................3-98
Cancel .............................................................................................................................................3-99
Hour Mode Sele ction . ......................... ......................... ......................... ........................ ...................3-99
Intercom Call .......................................................................................................................................3-100
Intrusion (Privacy) .............................................................................................................................3-101
Release ...........................................................................................................................................3-101
Last Number Redial (LNR) ...............................................................................................................3-103
Loud Bell Control (Optional) .........................................................................................................3-104

iv Cont ents
Message ................................................................................................................................................3-105
Outgoing .......................................................................................................................................3-105
Premise (Messages) ...................................................................................................................3-107
Message Waiting ...............................................................................................................................3-110
Music-on-Hold (MOH) ......................................................................................................................3-112
Mute .......................................................................................................................................................3-112
Muted Ringing ....................................................................................................................................3-112
On Hook Dialing .................................................................................................................................3-113
Page ........................................................................................................................................................3-113
Allow/Deny ...................................................................................................................................3-114
Meet Me .........................................................................................................................................3-114
Pause ......................................................................................................................................................3-115
Private Line ..........................................................................................................................................3-116
Pulse To Tone Switch-Over ............................................................................................................3-116
Rec all (Transfe r Recall) ........................................ ....................... ......................... ....................... ......3-117
Reminder Tones .................................................................................................................................3-117
Ringing Line Priority .........................................................................................................................3-118
Save Dialed Number (SDN) ............................................................................................................3-118
Spee d Dialing (A BBR) ...................................... ......................... ......................... ....................... ........3-119
Station ...................................................................................................................................................3-123
Copy ................................................................................................................................................3-123
Feature Status Check ................................................................................................................3-123
Drop Time-Out ............................................................................................................................3-124
Groups ............................................................................................................................................3-124
Numbering Plan .........................................................................................................................3-124
Parameters ....................................................................................................................................3-125
Position ..........................................................................................................................................3-125
Time ................................................................................................................................................3-125
Station Lock/Unlock ........................................................................................................................3-125
Station Message Detail Recording (SMDR) ..............................................................................3-127
System ...................................................................................................................................................3-129
Ring Scheme ................................................................................................................................3-129
Time ................................................................................................................................................3-129
Tone Detector .....................................................................................................................................3-130
Tone/Inter-Digit Duration ..............................................................................................................3-131
Transfer .................................................................................................................................................3-132
UCD Group (Hunt) .............................................................................................................................3-133
Station ............................................................................................................................................3-133
User Name Programming ...............................................................................................................3-135
User Saved Number Redial (USNR) .............................................................................................3-136
Voice Announce (Hands-Free or Tone) .....................................................................................3-137
Voice Mail .............................................................................................................................................3-138
Button .............................................................................................................................................3-141
Dialing Ratio .................................................................................................................................3-141
Integration ....................................................................................................................................3-142
Monitor ..........................................................................................................................................3-143
Port ..................................................................................................................................................3-144

Cont ent s v
Voice Recorder ...................................................................................................................................3-145
Volume Control ..................................................................................................................................3-146
Warning Tone .....................................................................................................................................3-146
Warning Time ..............................................................................................................................3-146
Voice Mail .............................................................................................................................................3-147
4SLTFeaturesandOperation
SLT Feature Code Table ..................................................................................................................4-3
Alarm Clock ..........................................................................................................................................4-5
Set ....................................................................................................................................................4-5
Cancel .............................................................................................................................................4-5
Call Back ................................................................................................................................................4-5
Clear ................................................................................................................................................4-5
Call Brokering ......................................................................................................................................4-6
Call Forward ........................................................................................................................................4-6
Busy .................................................................................................................................................4-6
Cancel .............................................................................................................................................4-6
Direct (All Call) .............................................................................................................................4-6
DND Forward ...............................................................................................................................4-7
External Forward ........................................................................................................................4-7
Follow To .......................................................................................................................................4-7
Follow Me Call Forward ...........................................................................................................4-7
No Answer ....................................................................................................................................4-7
Call Operator (Call Attendant) ......................................................................................................4-7
Call Park Answer ................................................................................................................................4-8
Call Pickup ............................................................................................................................................4-8
Direct ..............................................................................................................................................4-8
Group ..............................................................................................................................................4-8
Camp On ...............................................................................................................................................4-8
CO Line Access ...................................................................................................................................4-9
Specific Line .................................................................................................................................4-9
Do Not Disturb (DND) ......................................................................................................................4-9
Flash .......................................................................................................................................................4-10
Hold ........................................................................................................................................................4-11
Flash ................................................................................................................................................4-11
Hot Line (Ring Down) .......................................................................................................................4-11
Cancel .............................................................................................................................................4-12
Intercom Call .......................................................................................................................................4-12
Intrusion (Privacy) .............................................................................................................................4-12
Last Number Redial (LNR) ...............................................................................................................4-12
Message Waiting ...............................................................................................................................4-13
Cancel .............................................................................................................................................4-13
Clear Message Sent ...................................................................................................................4-13
Retrieve ..........................................................................................................................................4-13
Send ................................................................................................................................................4-13
Page ........................................................................................................................................................4-13
External (Paging Speakers) ....................................................................................................4-14

vi Cont ents
Meet Me Answer (Meet Me Page) ........................................................................................4-14
Station Group ..............................................................................................................................4-14
System All Call .............................................................................................................................4-14
Tenant Paging (All Groups) ....................................................................................................4-14
Port Numbering .................................................................................................................................4-14
2-Port Analog Adapter .............................................................................................................4-15
Spee d Dialing (A BBR) ...................................... ......................... ......................... ....................... ........4-16
Dialing ............................................................................................................................................4-16
Storing ............................................................................................................................................4-16
Station Lock .........................................................................................................................................4-17
Password Change ......................................................................................................................4-17
Unlock ............................................................................................................................................4-17
Transfer .................................................................................................................................................4-17
UCD Group (Hunt) .............................................................................................................................4-18
Station ............................................................................................................................................4-18
Voice Mail .............................................................................................................................................4-19
Port ..................................................................................................................................................4-19
5 HOTEL/MOTEL -- Operator Features
Configurations ....................................................................................................................................5-3
911 Emergency Service - User Dialed .................................................................................5-3
Multiple Wake-Up Calls ............................................................................................................5-6
Room Status .................................................................................................................................5-7
Voice MailBox (Clear Messages) ............................................................................................5-10
Feature Access Codes ...............................................................................................................5-11
Station Type .................................................................................................................................5-12
6 Maintenance/Troubleshooting
System Maintenance ........................................................................................................................6-3
Ge neral Information ............................. ......................... ......................... ......................... ..........6-3
System Diagnostics ...........................................................................................................................6-4
A Database Programming Forms
Programming Work Sheets ............................................................................................................A-3
BPartNumbers
Basic/Optional Equipment .............................................................................................................B-3

Fig ures vii
Figures
DHS-L KSU (cover removed) ..................................................................................................................... 2-5
KSU Layout ...................................................................................................................................................... 2-6
Power Supply ................................................................................................................................................. 2-7
MPB ................................................................................................................................................................... 2-9
MISB Layout .................................................................................................................................................... 2-11
DTMF Receiver Board .................................................................................................................................. 2-12
T1IB Board ....................................................................................................................................................... 2-12
LCOB-8 (8-Circuit Loop Start Board) ...................................................................................................... 2-13
DTIB-8 (8-Circuit Digital Telephone Board) ......................................................................................... 2-13
DTIB-16 (16-Circuit Digital Telephone Board) .................................................................................... 2-14
SLIB-1 6 (16-Circuit SLT Board) ................................................................................................................. 2-14
Enhanced Key Telephone ......................................................................................................................... 2-15
Executive Key Telephone .......................................................................................................................... 2-16
DSS Console ................................................................................................................................................... 2-17
2-Port Analog Adapter ............................................................................................................................... 2-18
2-Port Analog Expander ............................................................................................................................. 2-19
MPB Layout ..................................................................................................................................................... 2-32
MISB Layout .................................................................................................................................................... 2-33
MISB Cut Sheet .............................................................................................................................................. 2-34
Point-To-Point T1 Connection ................................................................................................................. 2-35
T-1 Single Card Connection ...................................................................................................................... 2-35
DTIB-8/16 Wiring .......................................................................................................................................... 2-37
SLIB Wiring ...................................................................................................................................................... 2-38
LCOB Wiring ................................................................................................................................................... 2-39
Key Telephone Modular Jack Locations ............................................................................................... 2-44
RS-232C DB-9 Connector ........................................................................................................................... 2-45
2-Port Analog Adapter ............................................................................................................................... 2-49
Jumper Switch ...............................................................................................................................................2-50
Soft Buttons .................................................................................................................................................... 3-3
Database Programming Functions—Station and CO Line ........................................................... 3-35
Database Programming Functions—Call Handling ........................................................................ 3-36
Database Programming Functions—Resource, Restriction and Station App. ...................... 3-37
Database Programming Functions—Line App. ................................................................................ 3-38
Database Programming Functions—System App. .......................................................................... 3-39
System Configuration ................................................................................................................................. 3-62
Caller ID Connection ................................................................................................................................... 3-63

Ta b l e s viii
Tables
FCC Compliance ...........................................................................................................................................1-3
RS-232C DB-9 Connector ........................................................................................................................... 2-8
MPB Specifications .......................................................................................................................................2-9
MISB Function Specifications ................................................................................................................... 2-10
Digital Hybrid System Capacities ........................................................................................................... 2-20
Electrical Specifications .............................................................................................................................. 2-23
Environmental Specifications .................................................................................................................. 2-23
Unit Specifications .......................................................................................................................................2-24
Maximum Cable Length ............................................................................................................................ 2-25
Dialing Specifications ................................................................................................................................. 2-25
FCC Re gistration Num bers ......................................... ......................... ......................... ............................. 2-25
Audible Signals .............................................................................................................................................2-26
Default Station Directory Numbers ....................................................................................................... 2-40
Default CO Trunk Directory Numbers ................................................................................................... 2-41
Station Location Cable Terminations ....................................................................................................2-42
Station Programming Table .....................................................................................................................3-7
CO Lines Programming Table .................................................................................................................. 3-9
Call Handling Programming Table ........................................................................................................ 3-10
Resource Programming Table ................................................................................................................. 3-14
Restriction Programming Table .............................................................................................................. 3-17
Station Application Programming Table ............................................................................................. 3-21
Line Application Programming Table ................................................................................................... 3-23
System Application Programming Table ............................................................................................. 3-25
Maintenance Application Programming Table ................................................................................. 3-31
Diagnostics Application Programming Table .................................................................................... 3-33
Feature Access Codes ................................................................................................................................. 3-40
System Numbering Plan ............................................................................................................................ 3-43
Call Forward Programming ...................................................................................................................... 3-53
Call Pickup Priority List ............................................................................................................................... 3-69
Restriction Data (Example) ....................................................................................................................... 3-78
Dial Pad Key Programming .......................................................................................................................3-106
Available Outgoing Pre-Programmed Messages ............................................................................. 3-107
Available Premise Pre-programmed Messages ................................................................................. 3-108
SMDR (Data Examples) ............................................................................................................................... 3-128
System Ring Scheme ................................................................................................................................... 3-129
Voice Announce ...........................................................................................................................................3-137
SLT Feature Access Codes .........................................................................................................................4-3
Default Station Directory Numbers ....................................................................................................... 4-15
Feature Access Codes (Guest) .................................................................................................................. 5-12
Central Processor Unit (CPU) .................................................................................................................... 6-4

ix Ta b l e s
Key Telephone / SLT Telephones Dead ................................................................................................ 6-5
Erratic Key Telephone Operation ........................................................................................................... 6-6
Key Telephone (cannot be heard) .......................................................................................................... 6-6
Key Telephone (cannot hear) ................................................................................................................... 6-7
Speakerphone (cannot be heard) .......................................................................................................... 6-7
No Sound From Speaker ............................................................................................................................ 6-7
Static/Noise During Conversation .......................................................................................................... 6-8
CO Line Problems .........................................................................................................................................6-9
Lines Stay Busy .............................................................................................................................................. 6-9
Btn Programming is Lost/Changed at Key Telephone ................................................................... 6-10
System Application Numbering Plan ....................................................................................................A-3
CO Line Data .................................................................................................................................................. A-3
Station Data .................................................................................................................................................... A-4
TRUNKS Data .................................................................................................................................................. A-5
Call Handling Data .......................................................................................................................................A-6
CO Line Attributes ........................................................................................................................................ A-7
CO Line Attributes ........................................................................................................................................ A-7
External Call Forward - Auto Busy Redial Parameters ..................................................................... A-8
System Application Data ........................................................................................................................... A-9
Restriction Data .............................................................................................................................................A-11
Resource Data ................................................................................................................................................ A-15
System Speed DIal .......................................................................................................................................A-18
DHS-L Part Numbers .....................................................................................................................................B-3

» » » » » » » NOTES » » » » » » »

1Introduction
The information necessary to install, program, operate, and maintain the STARPLUS®
DHS-L™ systemsisaddressedinthismanual.

Regulatory Info rmation (U.S.A.) 1-3
Chapter 1 - Introduction
Regulatory Information (U.S.A.)
The FederalCommunications Commission (FCC) has established rules that allow the
direct connection of the DHS-L systems to the telephone network . Certain actions must
be undertaken or understood before the connection of customer-provided equipment is
completed.
Telephone Company Notification
Before connecting the DHS-L system to the telephone network, the local telephone
companymustbegivenadvancenoticeofintentiontousecustomer-provided
equipment, and must be provided with the following information:
Telephone numbers to be connected to the system
DHS-L system information
REN
USOC jack required f or direct intercon nection with the telep hone network (RJ11C)
FCC Registration Numbers (Refer to Table 1-1 )
Incidence of Harm
If the telephone company determines that the customer-provided equipment is faulty
and possibly causing harm or interruption to the telephone network, it should be
disconnecteduntil repairs canbe made.If thisis not done,the telephonecompany may
tempor arily d is connect service.
Changes in Service
The local telephone company may make changes in its communications facilities or
procedures. If these changes affect the use of the DHS-Ls y stem or co mpat ib ilit y with the
network, the telephone company must give written notice to the user to allow
uninterrupted service.
Table 1-1: FCCCompliance
Complies with Part 68, FCC Rules. DHS-L
FCC Registr ation Number for PBX or hybrid
operation (CO Line accessed by means of
dial-access-codes or group/pooled CO l ine
access)
D6XTAI-23279-MF-E
Ri nger Equivalence Number (REN) or
service code
1.1B
Type and USOC number of the interface
jack tobe orderedfromthe telephone
company
RJ21X

1-4 Toll Fraud and DISA Disclaimer
Ch a pt e r 1 - I n t ro d uc ti o n
Maintenance Limitations
Maintenance on the DHS-L system must be performed only by the manufacturer or its
authorized agent. The user may not make any changes and/or repairs except as
specifically noted in this manual. If unauthorized alterations or repairs are made, any
remaining warrantyand the software license for the system will be voided.
Hearing Aid Compatibility
All DHS-L digital terminals are Hearing Aid Compatible, as defined in Section 68.316 of
Part 68 FCCRulesand Regulations.
UL/CSA Safety Compliance
The DHS-L system hasmet all safety requirements and was found in compliance with the
Underwriters Lab oratories (UL) 1459.
Notice of Compliance
The DHS-L system complies with rules regarding radiation and radio frequency emissions
by Class A computing devices. In accordance with FCC Standard 15 (Subpart J), the
following information must be supplied to the end user:
Tol l Fr au d a n d DIS A D i s c la i m er
“While this device is designed to be reasona bly secure against intrusio ns from f raud ulent
callers, it is by no means inv ulnerable to f raud . Theref ore, no exp ress or imp lied warra nty
is made against such fraud including interconnection to the long distance network.”
“While this device is d esigned to be rea sonably secu re aga inst inv asion of privacy, it is by
no means invulnerable to such invasions. Therefore, no express or implied warranty is
made against unlawful or unauthorized utilization which results in the invasion of one’s
right of privacy.”
Vodavi has made every reasonable effort to ensure that this product works in most
business environments. However, there may be some environments (RFI and EFI) in
which this product may not work properly. In such cases, it isthe responsibility ofthe
installer to take the necessary actions to correct the situation.
“Thi s e qui pmen t gen era tes and uses RF en erg y and if no t i nstall ed an d used in accord anc e
with the Instruction Manual, may cause interference to Radio Com munications. It has been
tested and found to comply with the limits for a Class A computing device, pursuant to
Subpa rt J of Part 15 of the FCC Rules, which are designed to provide reasonable protection
against such interference, when operated in a c ommercial environment. Operation of t his
equipmentin a residential area is likely to cause interference, in which case the user, at his
own expense, will be required to take whatever measures may be required to correct the
interference.”
Use of Station Lock Feature 97 will restr ict access to 911. Also, u se of cert ain musi c so urces
for BGM or MOH may violate copyrightlaws.

2Description and Installation
The STARPLUS DHS-L™Digital Hybrid System is a full-featured digital key telephone
system. The common system architecture supports two digital telephone models, a
Direct Station Selector and an expandable analog adaptor interface. DHS-L is
designed to meet the telecommunications needs of small-to-medium sized
business offices.