Panasonic DBS Series Installation guide

Panasonic Digital Business System - Overview
April 1997 Issue 6
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Panasonic
Digital Business System
Overview

Panasonic Digital Business System - Overview
April 1997 Issue 6
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Contents
INTRODUCTION 4
IMPORTANT SYSTEM DATA 4
PORT TYPES 4
SPECIAL AND OPTIONAL CIRCUITS SUPPORTED 4
PORT TO PORT CONNECTIONS PERMITTED 5
PORT TO PORT LOSS 5
RELATIVE LEVELS 5
LOUDNESS RATING 5
CABLING REQUIREMENT 6
OVER-VOLTAGE PROTECTION 6
PBX RECALL 6
1AS PORT LINE FEEDING 6
ANALOGUE EXTENSIONS 6
CALL PATH DELAY 7
POWER FAILURE 7
INTERCONNECTION OF PORTS 8
PREVENTION OF ACCESS BY THE USER 8
SIMPLE CALL ROUTING MODE 8
APPROVED FEATURES 9
SYSTEM CAPACITY AND SPECIFICATIONS 10
DBS EQUIPMENT DESCRIPTIONS 11
DBS CCU (DBS 38 / DBS 68 / DBS 90) 11
DBS 38 BUILT IN BATTERY 11
DBS 68 / 90 BUILT IN BATTERY 11
EXTERNAL BATTERY CABINET AND BATTERY 12
CPC-B CENTRAL PROCESSOR CARD 12
CPC-C CENTRAL PROCESSOR CARD 12
CPC-EX CENTREL PROCESOR CARD 12
SCC SYSTEM CONTROL CARD 12
RAI REMOTE ADMINISTRATION INTERFACE 13
EXCHANGE LINE CARD 13
DIGITAL EXTENSION CARD 13
ANALOGUE EXTENSION CARD 13
DTMF RECEIVER CARD 13
SLT RING GENERATOR 14
DOORPHONE INTERFACE 14
DOORPHONES 14
METER PULSE DETECTION CARD 14
-48V POWER SUPPLY 14
E&M CARD 14
AC15A CARD 15
PROPRIETARY KEY TELEPHONES 15
ISDN INTERFACE 16
DASS II EQUIPMENT LIST 16
DASS II FEATURES 16
DASS II FEATURES FOR FUTURE USE 16

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DASS II FEATURE DESCRIPTIONS 16
DASS II DETAILED FEATURE DESCRIPTIONS 17
DASS II RELATIONSHIP WITH EXISTING FEATURES 20
OTHER RESTRICTIONS WHEN USING DASS II ON DBS 22
VOICE ANNOUNCE UNIT 22
FEATURE ENHANCEMENTS WITH SOFTWARE VERSIONS 4.1 & ISDN 1.1 23
GROUP RINGING 23
INCOMING LINE NAME ASSIGNMENT 23
INTERNAL DTMF DIALLING FROM SYSTEM AND PERSONAL SPEED DIALS 24
CALL LOGGER INDICATION OF HELD AND TRANSFERRED CALLS 24
180 SYSTEM SPEED DIAL AVAILABILITY 25
CALL CHARGE RANGE INCREASED 25
SUPPRESSION OF CALL FORWARD INDICATIONS 25
ISDN DDI GROUP NAME DISPLAY 25
ABSENCE MESSAGE ENTRY WITHOUT A DSS CONSOLE 25
CALL FORWARD NO ANSWER SETTING FROM MENUS ON THE VB3411LDS 25
THE CPC-EX CARD 26
CPC-EX - EURO ISDN 27
EURO ISDN AND ISDN FEATURE ENHANCEMENTS 27
CALL FORWARD WITH GROUP RINGING 27
RINGING HUNTING FOR EXTERNAL CALLS 27
OPERATOR CALL FORWARD 28
EXTENSION FEATURE CLEAR 28
PROGRAMMING MODE FROM ANY DISPLAY KEYSET 28
CPC-EX - DBS DDI ENHANCEMENTS 29
DDI NIGHT SERVICE TABLE 29
ALTERNATIVE DDI DESTINATION - BUSY / NO ANSWER 29
DDI RING GROUP MEMBERSHIP 29
DDI HUNT GROUP 29
TONE AND LAMP INDICATION 31

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Introduction
The Digital Business System (DBS) range is a hybrid system allowing both digital key
telephone and analogue telephone handsets.
There is a range of three cabinet sizes. DBS38 , DBS68 and DBS90. These can be used
individually or combined with a second DBS90 to give a range of systems DBS38 , DBS68 ,
DBS90 , DBS128 (DBS90+DBS38) , DBS158 (DBS90+DBS68) and DBS180
(DBS90+DBS90).
The cabinets are supplied empty, except for the power supply, and are configured using
modular cards and equipment options.
This section describes the port types and equipment for the DBS.
Important System Data
This is a class A product.
In a domestic environment this product may cause radio interference, in which case the user
may be required to take appropriate measures.
This product has been CE marked to show compliance with the EMC Directive 89/336/EEC
amended by 92./31/EEC and 93/68/EEC.
Port Types
Table 1 - Port Connections
Special And Optional Circuits Supported
Table 2 - Special & Optional Circuits
Port Type Permitted Connection
PAS
requirements
2 wire PSTN exchange line without DDI
2 wire PBX extension
Loop calling unguarded clearing, DTMF or LD
signalling, timed break or earth recall.
1AS
requirements
2 wire analogue speech band equipment
DTMF or LD dialling, timed break recall
E.g. SLT, cordless telephone, FAX, modem
ITS Panasonic proprietary DBS digital keytelephone
Panasonic digital Voice Announce Unit
Circuit Type Circuit Use
Meter Pulse, 50 Hz Call charge calculation
DC5, 2 wire + E&M Private circuit link
ISDN 30 , DASS 2 ISDN network connection

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Port To Port Connections Permitted
The following port to port connections can be made.
Table 3 - Call Paths
Port To Port Loss
The following table shows the maximum port to port and associated cable loss.
Table 4 - Port To Port Loss
Relative Levels
The input and output relative levels for each port type are shown below. These values
assume zero cable loss.
Table 5 - Relative Levels
Loudness Rating
The loudness rating for each port type is given below. (PTRP - )
Table 6 - Loudness Rating
Call Path Call Path Call Path Call Path
PAS > ITS ITS > ITS ITS > PAS 1AS > 1AS
PAS > 1AS ITS > 1AS 1AS > PAS 1AS > ITS
Port > Port Port > Port Loss Associated Cable Loss
PAS > 1AS 1.3 dB 0.7 dB
PAS > ITS
ITS > 1AS
Port Input (dBr) Output (dBr)
PAS -6 2.5
1AS 3.5 -7
ITS
PTRP > ITS 0 dB ITS > PTRP 2.5 dB
PTRP > 1AS 1AS > PTRP
PTRP > PAS PAS > PTRP

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Cabling Requirement
The cabling between the Central Control Unit (CCU) and each extension is 2 wire, 0.5mm
diameter copper conductor and terminated with a Line Jack Unit (LJU). Use a master LJU for
analogue extensions and a slave LJU for the digital extensions.
The following table shows the maximum cable length from the CCU.
Cabling from the Network Test and Termination Point (NTTP) must also comply with these
requirements.
Table 7 - Maximum Cable Distances
Over-voltage Protection
Surge arresters are fitted to the PAS, ITS and 1AS ports of the system. If the extension
cabling extends between buildings or runs around the outside of a building, surge arresters
should be fitted at both exit and entry points.
PBX Recall
The DBS can be installed as a host or subsidiary system to suitably approved PBX
equipment.
As a host the DBS will accept timed break recall signals from a PBX connected to a 1AS
port.
As a subsidiary the DBS can provide both timed break and earth recall signalling to the host
from PAS ports.
1AS Port Line Feeding
The DBS is not a through fed system. Line feeding from 1AS ports to connected equipment is
derived internally from the DBS CCU. The maximum current that can be supplied to
extension equipment on 1AS ports is 50mA.
Analogue Extensions
When using separately approved extension apparatus, Panasonic recommend DTMF
signalling. The recall signalling must be timed break. The impedance class of the apparatus
must be class (a) of clause 4.3.2.1 of BS6305:1982.
Cable Maximum Loop Resistance Maximum Length
CCU > ITS 40 ohms 240m
CCU > DSS 20 ohms 120m
CCU > 1AS (A version) 100 ohms 480m
CCU > 1AS (B version) 100 ohms 880m
CCU > PFU 250m
NTTP > CCU 15m

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Call Path Delay
The maximum call path delay for each speech link is shown below. The times are in micro-
seconds.
Table 8 - Call Path Delay
Power Failure
If installed the batteries inside the CCU will back up the operation of the DBS for a short
time. The precise time will depend upon system size and the volume of call traffic.
Alternatively an external battery may be added to increase the running time in the event of a
power failure.
In addition a number of power fail telephone units (PFUs) can be connected. The CCU will
divert the first few lines to these units if the power and battery backup fails. The number of
PFUs varies according to the CCU used.
Call Path Max. Delay Call Path Max. Delay
PAS > ITS 1000 ITS > PAS 1000
PAS > 1AS 875 1AS > PAS 875

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Interconnection Of Ports
Warning
Interconnection directly or by way of other apparatus, of ports marked in accordance with
clause 5.2 of BS6301:1989 with ports marked or not so marked may produce hazardous
conditions on the network. Advice should be obtained from a qualified engineer before such a
connection is made.
SAFETY WARNING: See Instructions For Use !
The ports so marked do not provide isolation sufficient to satisfy BS6301. Apparatus
connected to such ports should either have been approved to BS6301 or have previously
been evaluated against British Telecommunications PLC, Technical Guides 2 or 26 and
given permission to attach. Other usage will invalidate any approval given to the apparatus.
Prevention Of Access By The User
The DBS is intended to be accessible only to authorised personnel. There are no user
accessible parts inside the equipment. Failure to prevent such user access will invalidate any
approval given to this apparatus.
Simple Call Routing Mode
The DBS works only in Simple Call Routing Mode (SCRM). All PSTN ports can be configured
for SCRM working. ITS and 1AS ports are associated with the SCRM PSTN ports.

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Approved Features
The DBS has been approved for the use of the following facilities. This list includes exchange
line related features only and does not include internal facilities.
•Direct exchange line access •Hold and transfer
•Group exchange line access •Music on hold
•Exchange line grouping •Hold reminder
•Exchange line key access •Call pick up
•On hook dialling •External conference
•Handsfree conversation •Busy override
•Speed (abbreviated) dialling •Call hunting
•Last number redial •Meter pulse detection
•Saved number redial •Remote programming
•Auto answer by lifting a handset •DISA
•Call barring •PBX and PSTN recall
•Call barring override •LD and DTMF dialling
•Station lock •Least cost routing
•Call duration display •Headset connection
•Trunk queuing •Night transfer
The CPC-C Card for ISDN provides all the above facilities and adds the following
•DASSII Primary Rate ISDN •Direct Dial In (144 Numbers)
•Calling Line Identity On ISDN Lines •Call Charge Information On ISDN Lines
The CPC-EX card provides ISDN and E&M/AC15A networking along with the facilities above
and the following
•Trunk To Trunk Conference •Trunk To Trunk Transfer
•External Call Forward •Internal / External Ring Priority
•DISA Break Out •CLI Name Look Up
Any other usage will invalidate the approval of the apparatus if as a result it then ceases to
comply with the standards against which approval was granted.

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System Capacity And Specifications
DBS 38 DBS 68 DBS 90 DBS 128 DBS 158 DBS 180
Exchange Line Ports 6 12 18 24 30 36
Extension Ports 24 48 64 88 112 128
Extension/Line Ports 6/8 6/8 6/8 6/8 + 6/8 6/8 + 6/8 6/8 + 6/8
Max.Key Telephones 32 56 72 104 128 144
Max.Analogue Tels. 24 48 64 96 120 136
Max. DSS Consoles 444444
Exch/Extn Speech Non-Blocking
Conf Speech Paths 8
Operator Positions 2
Paging Groups 8
Speed Personal 10
Dial System 90 x 2
Digits 24
Table 9 - System Capacity
DBS 38 DBS 68 DBS 90 DBS 128 DBS 158 DBS 180
Power Standby 170W 250W 320W 490W 570W 640W
Consumption Maximum 216W 324W 444W 660W 768W 888W
Dimensions
HxWxD 532x441x 210 532x554x 210 532x554x 210 DBS 90+38 DBS 90+68 DBS 90+90
Weight (Kg) 24 29.5 30.8 54.8 60.3 61.6
Table 10 - Size & Power Specifications

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DBS Equipment Descriptions
This section contains a description of each component that can be used to build up a DBS
system. Refer to the Installation Manual for details about installing these components.
DBS CCU (DBS 38 / DBS 68 / DBS 90)
Model Numbers: VB3357 / VB3557 / VB3657 Max. Per System: 2
The DBS CCU is the basis of the whole system, modular cards and power supplies are fitted
to configure the system. A DBS 90 CCU can be doubled up with any one other CCU to
configure larger systems. The CCU has a bank of slots for the installation of modular cards
and a range of connection points for other optional equipment. The slots are divided into the
following groups:
CPC For the main system processor card
SCC For the system control card
LINE LINE slots can accept either an exchange line card or E&M card
EXT EXT slots can accept either digital or analogue extension cards
EXT/LINE or Universal slot can accept exchange line , E&M , ISDN , digital or
analogue extension cards.
AUX For DTMF receiver cards and system interconnection cables.
Connections are provided on the CCU for the following:
Exchange Lines Music On Hold (MOH) source
Extensions External Paging Adapter (EPA)
E&M Circuits Earth connections
Power Fail Telephones Doorphone Interface
SLT Ring Generator -48v Power Supply
Backup Batteries Call Logging Equipment (RS232C)
DBS 38 Built In Battery
Model Number: VB2450A2 Max. Per DBS38: 1
Batteries for use with the DBS 38 CCU to maintain system operation in the event of a power
failure. It will hold system operation for approximately 30 minutes on a fully configured
system. From discharged state it takes 15 hours charging to reach 80% fully charged.
DBS 68 / 90 Built In battery
Model Number: VB26502 Max. Per DBS68/90: 1
Batteries for use with the DBS 68 and 90 CCUs to maintain system operation in the event of
a power failure. It will hold system operation for approximately 30 minutes on a fully
configured DBS68 and 15 minutes for a fully configured DBS 90 system. From discharged
state it takes 15 hours charging to reach 80% fully charged.

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External Battery Cabinet And Battery
Model Number: VB2497 / VB24973PEX Max. Per CCU: 1
With the internal batteries removed the external battery cabinet can be attached to the CCU.
This is larger capacity battery than the internal option and will hold the system operation for
approximately 4 hours on DBS 38 , 5 hours DBS 68 , 4 hours DBS 90 and 4 hours per
cabinet on an double CCU system. When used on a double CCU system one external battery
and cabinet is required to be installed for each CCU. From discharged state it takes 15 hours
charging to reach 80% fully charged.
CPC-B Central Processor Card
Model Number: VB3775 Max. Per System: 1
The Central Processor Card (CPC) is installed in a the dedicated CPC slot within the CCU. It
controls the system operation and holds the system software and engineer settings. It is a
68000 processor with the system program stored on EPROM and programmable options
stored in battery backed RAM. The system clock is also on this card. The CPU on this card is
in overall control of sub-CPUs on other system cards.
CPC-C Central Processor Card
Model Number: VB3775A Max. Per System: 1
The CPC-C card performs the same function as the CPC-B card with the addition of DASSII
ISDN connection supporting DDI, CLI and CCI. For a full feature description see the later
section ‘ISDN Interface’
CPC-EX Centrel Procesor Card
Model Number: VB3776 Max. Per System: 1
The CPC-EX is a further enhanced CPC card replacing both CPC-B and C above on systems
where both DASSII and analogue private networking are required. It also provides addition
system features as described in the appropriate section later ‘The CPC-EX Card’.
SCC System Control Card
Model Number: VB3665 Max. Per System: 1
The System Control Card (SCC) is installed in the dedicated SCC slot next to the CPC. It
provides tone generators for the system and controls external interfaces for music on hold ,
external paging , remote administration and call logging.

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RAI Remote Administration Interface
Model Number: VB3666A Max. Per System: 1
The Remote Administration Interface (RAI) is a plug in modem with 300 and 1200 bps
transmission speeds, V.21/22 standard. It is mounted onto the SCC. The RAI allows engineer
programming of the system from a remote location over an exchange line.
Exchange Line Card
Model Number: VB3660
Each exchange line card provides interfaces for 6 exchange lines. These are loop calling
unguarded clearing lines with LD or DTMF signalling. Exchange line cards are installed in
the LINE slots, but can also be installed in the universal slot. The maximum number which
can be installed is dependant upon the CCU used.
Digital Extension Card
Model Number: VB3670
Each Digital Extension Card (DEC) provides 8 interface circuits for the connection of
proprietary digital extensions. The card installed in the first EXT1 slot of the DBS must be a
DEC. The remaining slots can be any mix of DEC or Analogue Extension Cards (AEC). The
DEC can also be installed in the universal slot if required.
Analogue Extension Card
Model Number: VB3680
The Analogue Extension Card (AEC) provides a circuits for the connection of 8 analogue
equipment approved to BS6305. This equipment must used timed break recall signalling.
Dialling can be LD, however DTMF is recommended because not all features are accessible
form LD Telephones. To support this card the SLT Ring Generator VB3687 must be installed
and if DTMF telephones are used at least one DTMF Receiver Card VB3682. The AEC can
be installed in any EXT slot except the first EXT1 slot of the DBS.
DTMF Receiver Card
Model Number: VB3682 Max. Per System: 1
The DTMF Receiver Card (MFR) provides 8 DTMF receiver circuits for use by analogue
extensions and DISA calls.

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SLT Ring Generator
Model Number: VB3687 Max. Per CCU: 1
The SLT Ring Generator provides ringing signals to analogue extensions. The ring signal is
50vAC into 500ohms or 80vAC into 10 kilo-ohms at 25Hz +/- 3 Hz.
Doorphone Interface
Model Number: VB3473
The Doorphone interface is used to link upto 2 doorphones and lock releases to the DBS. It is
an externally mounted unit, which links into ports on the DBS.
Doorphones
Model Number: VL568G / VL582A Max. Per VB3473: 2
The doorphones are connected to the doorphone interface. There is a small and large
version.
Meter Pulse Detection Card
Model Number: VB3667 Max. Per Line: 1
The Meter Pulse Detection (MPD) card is a small daughter board installed into sockets on the
exchange line cards. One MPD card is required for each line where meter pulses are used.
The -48v Power Supply is required when MPD cards are used.
-48v Power Supply
Model Number: VB3697 Max. Per CCU: 1
The -48v Power Supply is used to provide the power for the MPD cards and E&M cards.
E&M Card
Model Number: VB3663 Max. Per DBS 38: 1
Max. Per Other CCU: 2
The E&M card provides three DC5 E&M circuit interfaces for use when linking the DBS to a
private network. When installed the -48v Power Supply is required to power the E&M card. It
can be installed into any LINE or universal slot except the first LINE1 in the DBS.

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AC15A Card
Model Number: VB3673 Max. Per DBS38: 1
Max. Per Other CCU: 2
The AC15A card provides three AC15A private circuit interfaces for use when linking the
DBS to a private network. The -48v Power Supply is not required to power the AC15A card. It
can be installed into any LINE or universal slot except the first LINE1 in the DBS.
Proprietary Key Telephones
The following range of proprietary key telephone equipment is available for connection to
digital extension ports.
VB3411 12 Line Key Standard Handset
VB3411DS 12 Line Key Handsfree Display Handset
VB3411LDS 12 Line Key Handsfree Large Display Handset
VB3611D 24 Line Key Display Handset
VB3611DS 24 Line Key Handsfree Display Handset
VB3011 O Line Key Handset
VB3631 Direct Station Selection (DSS) Console
With the introduction of the CPC-EX Processor Card the following new models were added
provide feature enhancements.
VBD411 12 Line Key Standard Handset
VBD411DS 12 Line Key Handsfree Display Handset
VBD411LDS 12 Line Key Handsfree Large Display Handset
VBD611D 24 Line Key Display Handset
VBD611DS 24 Line Key Handsfree Display Handset
VBD631 Direct Station Selection (DSS) Console

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ISDN Interface
The DASS II interface and associated equipment allows the connection of Primary Rate
ISDN to the Digital Business System (DBS). A maximum of 30 digital channels can be
connected to any of the DBS systems irrespective of the system size. Connection of the
digital circuits will reduce the number of analogue lines which can be connected to the
system. The tables in the installation manual show which combinations are valid. The
maximum number of DASS channels plus analogue lines can never exceed 48.
DASS II Equipment List
DASS II TRK Card VB3664UK
DASS II MDF VB3688UK
CPC-C Card VB3775AUK
Synchronisation Unit VB3668UK
DASS II Features
The following features are supported by the DBS DASS II interface.
Category 1 & 2 Calls
Direct Dial In (DDI)
Call Charge Information (CCI)
Calling Line Identity (CLI including OLI & TLI)
DDI , CCI and CLI require rental of network services.
DASS II Features For Future Use
The following features are intended for inclusion in future developments. These are proposed
features and their development in future products is not guaranteed.
Customer Controlled Diversion Call Charge Rate Data
Customer Controlled Channel Busying Customer Controlled Call Barring
DASS II Feature Descriptions
Category 1 & 2 Calls
All calls on the ISDN have a Service Indication Code (SIC code) to allow the network to
determine the call type. The DBS will accept incoming calls with SIC codes 00H , 10H or 12H
only other call types will be refused. Outgoing calls from the DBS use the SIC 10H.
Direct Dial In
The network can send the last digits of the number dialled by the caller to the DBS. This
string can be 1 to 6 digits long dependant upon configuration and the network services being
subscribed to by the user. The DBS will use these digits to route the call to a specific
extension or group of extensions using a look up table.

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Call Charge Indication
The call charge is sent to the DBS at the end of an outgoing call. This data can be printed on
the call logger and/or optionally displayed on keysets with an LCD.
Calling Line Identity
The calling party’s number or called party’s number can be displayed on a keyset with an
LCD. The Incoming CLI from a caller is called Originating Line Identification (OLI) and the
number returned from the network from a called party is Terminating Line Identification (TLI).
DASS II Detailed Feature Descriptions
Where the DASS II features are different from the analogue equivalent the details are given
below.
Channel Seizure
The DASS channels are analogous to exchange lines and the terms channel and line can be
considered equivalent when discussing calls over ISDN. The method of selecting a DASS
line is the same as for Analogue lines. The two line types can be mixed in line groups, but
caution is required since the dialling method for each is slightly different. When a DASS line
is seized the B channel is set so that incoming calls on the selected channel are rejected.
Dummy Dial Tone
When a channel is selected the DBS will send a dummy dial tone to the internal user. The
tone stops when dialling starts. If no dialling is started during a specified time after seizure
the channel is released and busy tone sent to the user.
Dialling
Dialled digits are stored in the DBS and compiled into a dial message. this is sent to the
network when a send key (#) time-out expires. The send key can be assigned to an FF key.
If no digits are sent busy tone is heard by the user.
The timer restarts after each digit is entered. The time-out can be set by programming.
The # key is used as the send key. Analogue extensions using LD dialling will have to wait for
the time-out since they are unable to dial the send command. When dialling the first press of
# will send the digits entered so far to the line. A second press will act as a DTMF # or
account code terminator depending upon circumstances.
If digits are dialled after the send key is pressed they are stored by the DBS and sent as
DTMF after the called party answers. When using a DASS II channel the speech path is not
established until the called party answers.

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Call Type
When a call is received the SIC showing its type and capacity required are checked by the
DBS. Calls of a type which are not supported by the DBS are terminated.
DASS Incoming Ringing
Calls without DDI information will ring as if they were a standard analogue line. When A DDI
call is received it will ring as per the DDI settings. If the system is not set to use DDI numbers
and a DDI call is received it will ring as if it were a normal incoming call.
Direct Dial In
The DBS can connect calls directly to extensions using DDI information of 1 to 6 digits sent
from the network. Up to 144 DDI numbers can be specified in a programming look up table to
route calls to an extension or group of extensions. A maximum of 50 groups of 8 member
extensions can be created via programming.
In the DDI look up table each DDI number can only be specified once and route to one
extension or group. Extensions and groups can be the recipient of calls to multiple DDIs by
assignment to these DDI numbers in the table.
An incoming DDI call has priority over other incoming call types at the destination extension,
overriding DISA , private line and other incoming calls.
Delayed ringing does not operate with DDI calls.
Auto answer is always operative for DDI calls regardless of system settings.
DDI to Extensions
When a DDI call is routed to an extension hunting call forward and coverage groups will
operate as normal.
A extension cannot receive a DDI call under the following conditions.
Off hook
While receiving another call
While being used for programming
The extension to which call forward has been set cannot receive a call
While DND is set
While absence message is set
SLT overload (system cannot drive the ringer on any further SLTs)
While holding an internal or non appearing line and the DDI is also non appearing
While hunting is disabled

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DDI to Groups
When a DDI call is routed to a group hunting call forward and coverage groups are not
available and do not operate.
A extension in a group cannot receive a DDI call under the following conditions.
Off hook
While receiving another call
While being used for programming
The extension to which call forward has been set cannot receive a call
While DND is set
While absence message is set
SLT overload (system cannot drive the ringer on any further SLTs)
While holding an internal or non appearing line and the DDI is also non appearing
A group cannot receive a DDI call under the following conditions.
All members are unable to receive the call
The group is receiving another incoming DDI call which is not yet answered
Incoming DDI ringing is only sent once. If a receiving extension returns to idle after DDI
ringing is sent it will not ring for the missed DDI call.
Auto Transfer / Terminate Of DDI Calls
When a DDI call cannot be routed to its destination, is unanswered or the DDI number is not
recognised it will either be transferred to the operator or terminated depending upon system
program setting.
Sending Of DDI Number On Outgoing Calls
The DDI number of a telephone can be sent to the network with outgoing calls to become CLI
for the receiving party.
When a telephone has multiple DDI numbers assigned to it the DDI number sent is
determined using the following rules.
If the extension has its own DDI and is a DDI group member, extension DDI is sent
If the extension has more than one individual DDI, the DDI look up table is scanned
from 1 to 144 and the first DDI found for the extension is sent.
If more than one DDI group numbers and no extension DDI us set, the DDI look up
table is scanned from 1 to 144 and the first group DDI found for the extension is sent.
DASS II Called Party Busy
When the called party is busy the DBS can pass busy tone to the extension making the call
or terminate the call and pass dummy busy tone to the extension. It is also possible to display
the cause of the busy tone returned from the network on the LCD of a keyset. The action
taken when a called party is busy is specified through programming.

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Call Logging Output
The CLI and CCI data sent from the network is sent to the call logger. Condition codes for
incoming and outgoing DASS II calls have been added to the call logging output.
CLI Display
When a call is received the first 16 digits of a callers number can be displayed on the first
line of the LCD on a keyset. If CLI is not supplied by the network the channel number is
displayed similar to the display when an analogue incoming call is received.
When making a call the first 15 digits of the recipient party’s CLI can be displayed on the
second line of the LCD on a keyset if supplied by the network. If this data is not supplied the
dialled number is displayed as for analogue lines.
The number will not be displayed when the call is held, when the second line will display the
line number as for an analogue call.
Confirming Charge Data.
The charge data for the most recent call can be displayed on the LCD of a keyset. When new
CCI is received the previously stored value is replaced with the new one. This data is not
backed up.
The totals provided by the DBS at the operator console are cumulative and are only cleared
when the operator enters the command CONF #95 Ext No. *. See the DBS Operating
Instructions for more detail.
DASS II Relationship With Existing Features
Call Barring
Call barring operates in the same way as analogue lines.
Least Cost Routing
The LCR function will operate on the DASS II channels. However the method of accessing
the networks differ between the analogue and digital lines.
It is recommended that analogue line access be programmed as carrier 1 (NCC1) and DASS
II access be programmed as carrier 2 (NCC2).
When 131 access is used the 131 is sent first with the PIN and caller number are sent after
the network sends the acknowledged signal.
When 132 access is used , 132 and the caller number are sent at one time as a dial
message.