SpectraLink Link 150 M3 Operating instructions

Installation and Operation
Link Wireless Telephone System
Link 150 M3 MCU
Part Number: 72-0075-01
Issue D

SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
NOTICE
SpectraLink Corporation has prepared this document for use by SpectraLink personnel and clients. The
drawings and specifications contained herein are the property of SpectraLink and shall be neither
reproduced in whole or in part without the prior written approval of SpectraLink, nor be implied to grant
any license to make, use, or sell equipment manufactured in accordance herewith.
SpectraLink reserves the right to make changes in specifications and other information contained in this
document without prior notice, and the reader should in all cases consult SpectraLink to determine whether
any such changes have been made.
The terms and conditions governing the sale of SpectraLink hardware products and the licensing of
SpectraLink software consist solely of those set forth in the written contracts between SpectraLink and its
customers. No representation or other affirmation of fact contained in this document including but not
limited to statements regarding capacity, response-time performance, suitability for use, or performance of
products described herein shall be deemed to be a warranty by SpectraLink for any purpose, or give rise to
any liability of SpectraLink whatsoever.
In no event shall SpectraLink be liable for any incidental, indirect, special, or consequential damages
whatsoever (including but not limited to lost profits) arising out of or related to this document, or the
information contained in it, even if SpectraLink has been advised, knew, or should have known of the
possibility of such damages.
Trademark Information
SpectraLink
LinkPlus
Link Wireless Telephone System
NetLink Telephony Gateway
NetLink Wireless Telephone
NetLink SVP Server
SpectraLink Voice Priority
ccLink Wireless Telephone System
are trademarks and registered trademarks of SpectraLink Corporation.
All other trademarks used herein are the property of their respective owners.
Installation and Operation
Link WTS
Link 150 M3 MCU
© 2002 SpectraLink Corporation.
All Rights Reserved
Printed in the United States of America
SpectraLink Corporation
5755 Central Avenue
Boulder, CO 80301
Within the United States, dial
303.440.5330 or toll free
800.676.5465
Outside the U.S., dial
+1.303.440.5330
www.spectralink.com
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
Note concerning the Master Control Unit:
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference in which case the user will be required to correct the
interference at his own expense.
Note concerning shielded cable:
SpectraLink recommends the use of shielded cable for all external signal connections in order to maintain
FCC Part 15 emissions requirements.
Note concerning the Wireless Telephone and Base Stations:
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
WARNING Changes or modifications to this equipment not approved by SpectraLink Corporation may
cause this equipment to not comply with part 15 of the FCC rules and void the user’s authority to operate
this equipment.
WARNING SpectraLink products contain no user-serviceable parts inside. Refer servicing to qualified
service personnel.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
UL Information
This symbol on the nameplate means the product is listed by Underwriter’s
Laboratories, Inc. It is designed and manufactured to meet rigid U.L. safety
standards against X-radiation, fire, casualty, and electrical hazards.
The following are statements required for UL certification, related to safety procedures
that must be adhered to during installation.
Follow these general precautions while installing telephone equipment:
• Never install telephone wiring during a lightning storm.
• Never install telephone jacks in wet locations unless the jack is specifically designed
for wet locations.
• Never touch uninsulated telephone wires or terminals unless the telephone line has
been disconnected at the network interface.
• Use caution when installing or modifying telephone lines.
When installing Base Stations outside or in buildings other than the one containing the
System Controller, take the following precaution:
If wiring for a Base Station exits a building—whether to reach an outdoor Base Station
location or to reach a Base Station in another building—the wiring must be protected at
both ends by a Quick Clip Fuse from Illinois Tool Works, Linx Division, model number
SCP-2X2. The Quick Clip Fuse replaces the bridging clips on the 66 blocks for all four
connections to the non-internal Base Station.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
FCC Information
The Master Control Unit Complies with Part 68, FCC Rules
FCC Registration Numbers:
Link 150: IYGUSA-33400-PX-E
Ringer Equivalence:
Link 150 Model 3: 0.3B
SpectraLink Corporation
Link 150
Made in the USA
This equipment complies with Part 68 of the FCC Rules. On the back of this equipment is a label that
contains, among other information, the FCC Registration Number and Ringer Equivalence Number (REN)
for this equipment. If requested, this information must be given to the telephone company.
This equipment uses RJ-21 connectors.
The REN is useful to determine the quantity of devices you may connect to your telephone line and still
have all of those devices ring when your number is called. In most, but not all, areas, the sum of the RENs
of all devices connected to one line should not exceed five (5.0). To be certain of the number of devices
you may connect to your line, as determined by the REN, you should contact your local telephone company
to determine the maximum REN for your calling area.
If your telephone equipment causes harm to the telephone network, the telephone service may discontinue
your service temporarily. If possible, they will notify you in advance. But if advance notice isn’t practical,
you will be notified as soon as possible. You will be informed of your right to file a complaint with the
FCC.
Your telephone company may make changes in its facilities, equipment, operations or procedures that
could affect the proper functioning of your equipment. If they do, you will be notified in advance to give
you an opportunity to maintain uninterrupted telephone service.
If you experience trouble with this telephone equipment, please contact SpectraLink Corporation for
information on obtaining service or repairs.
SpectraLink Corporation
5755 Central Avenue
Boulder, CO 80301
303-440-5330
The telephone company may ask that you disconnect this equipment from the network until the problem
has been corrected or until you are sure that the equipment is not malfunctioning. There are no user
serviceable parts in this equipment.
This equipment may not be used on coin service provided by the telephone company. Connection to party
lines is subject to state tariffs.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
Industry Canada (IC) Notice
Notice:
The Industry Canada (IC) label identifies certified equipment. This certification means that the
equipment meets telecommunications network protective, operational, and safety requirements as
prescribed in the appropriate Terminal Equipment Technical Requirements document(s). The
department does not guarantee the equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to be connected to the
facilities of the local telecommunications company. The equipment must also be installed using an
acceptable method of connection. The customer should be aware that compliance with the above
conditions may not prevent degradation of service in some situations.
Repairs to certified equipment should be coordinated by a representative designated by the
supplier. Any repairs or alterations made by a user to this equipment, or equipment malfunctions,
may give the telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of the power
utility, telephone lines and internal metallic water pipe system, if present, are connected together.
This precaution may be particularly important in rural areas.
Caution: Users should not attempt to make such connections themselves, but should contact the
appropriate electric inspection authority, or electrician, as appropriate.
Notice: The Ringer Equivalence Number (REN) assigned to each terminal device provides as
indication of the maximum number of terminals allowed to be connected to a telephone interface.
The termination of an interface may consist of any combination of devices.
REN 0.3B
Approval Numbers:
Link 150: 2128-9760 A
Warranty and Repair Service Center:
SpectraLink Corporation
5755 Central Avenue
Boulder, CO 80301
303-440-5330
DOC Spread Spectrum certification
Base Station Cert. No. 2128-K1373
Wireless Telephone Cert. No. 2128-K1374
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
Table of Contents
1. ABOUT THIS DOCUMENT 9
1.1 Contacting SpectraLink 9
1.2 Icons and Conventions 9
1.3 Installation Overview 9
2. LINK WIRELESS TELEPHONE SYSTEM OVERVIEW 11
2.1 System Operation 11
2.2 The Front Panel of the Link 150 MCU 13
3. SITE PREPARATION 14
3.1 Required Materials 14
3.2 Determine Location of MCU 14
4. RUN CABLE FOR SYSTEM 15
4.1 Run Cables to Base Station Locations 15
4.2 Pull Cable 16
4.3 Terminate Cable at Base Station Locations 16
4.4 Prepare Demarc Blocks 17
4.5 Install Demarc Blocks 21
4.6 Assign and Program Ports 21
4.7 Connect Cables from Base Stations and Phone Lines to Demarc Blocks 22
5. INSTALL LINK WIRELESS TELEPHONE SYSTEM 26
5.1 Survey Site 26
5.2 Check Components 26
5.3 Install MCUs 27
5.4 Install Base Stations 31
5.5 Install Outdoor Base Stations 33
6. CONNECT AND REGISTER WIRELESS TELEPHONES 34
6.1 Set Up Diagnostic Modem 34
6.2 Register Wireless Telephones 34
6.3 Unregister Wireless Telephones 35
6.4 Program Wireless Telephone Features 36
6.5 Test Wireless Telephones 36
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
7. SITE CERTIFICATION 37
8. SYSTEM ADMINISTRATION 38
8.1 Troubleshoot Error Codes 38
8.2 Troubleshoot Phone Features 38
8.3 Status LED Codes 39
8.4 Replace a Wireless Telephone 43
8.5 Replace an MCU 44
8.6 Replace a Base Station 45
9. WIRELESS TELEPHONE PLANNING WORKSHEET 46
10. BASE STATION LOCATION WORKSHEET 47
11. TECHNICAL PARAMETERS 48
11.1 Select Alternate Spread Spectrum Sequence 48
11.2 Change Companding 49
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
1. About This Document
This document explains installation and operation of SpectraLink’s Link Wireless
Telephone System (Link WTS), using the Link 150 Model 3 (M3) Master Control Unit
(MCU). The Link 150 MCU adds wireless service to your existing telephone system. The
installation process connects the Link WTS to your telephone system, and activates
SpectraLink Wireless Telephones.
1.1 Contacting SpectraLink
SpectraLink wants every customer to have a successful installation. Please refer questions
to our Customer Support Hotline at [phone]. The Hotline is open Monday
through Friday, 7:00 AM to 6:00 PM Mountain Time.
1.2 Icons and Conventions
This manual uses the following icons and conventions.
Caution! Follow these instructions carefully to avoid danger.
Note these instructions carefully.
NORM This typeface indicates a key, label, or button on the MCU or Wireless
Telephone.
1.3 Installation Overview
Installation has three phases. In most cases, a separate person is responsible for each
phase.
• Site preparation and wire installation – this is usually done by a wire technician or
contractor.
• Installing the SpectraLink system – this is done by SpectraLink or one of our
certified distributors.
• Programming the customer's telephone system to work with the SpectraLink
system – this is usually done by the customer’s system administrator or technician.
Because these major steps require some parallel activities, it is important to coordinate
the activities among the persons involved.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
This table lists the installation steps and the person usually responsible for each step.
9Task
Description
Wire
Contractor Installer
System
Admin
Site Preparation
Determine Location of MCU
9
Run Cable for System
Run Cable to Base Station Locations 9
Pull Cable 9
Terminate Cable at Base Station Locations 9
Prepare and Install Demarc Blocks 9
Assign and Program Ports
9
Connect Cables to Demarc Blocks 9
Install SpectraLink System
Survey Site and Check Components 9
Install MCUs 9
Install Base Stations 9
Install Outdoor Base Stations 9
Connect and Register Wireless
Telephones
9
Set Up Diagnostic Modem 9
Register Wireless Telephones 9
Program Wireless Telephone Features
9
Test Wireless Telephones 9
Site Certification 9
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
2. Link Wireless Telephone System
Overview
Review this section if you are unfamiliar with the features and operation of the Link
WTS.
2.1 System Operation
The Link WTS is a wireless communication system that offers direct telephone access for
incoming and outgoing calls anywhere within a facility.
The Link WTS consists of three basic components: the Master Control Unit (MCU), the
Base Station and SpectraLink Wireless Telephones. This diagram shows an overview of
system. Components are described below.
M
aste
r
Control
U
ni
t
Link
Wireless
Telephones
B
ase
Stations
Analog or
Digital
Interface
PBX
Application
Server
OAI
Gateway
The Link Wireless Telephone System
• Master Control Unit (MCU) – serves as the connecting point, or gateway, between
the Base Stations and the existing telephone system. One or more of these boxes
(approximately 12 x 3 x 7 inches) are typically installed in the telephone equipment
room and provide connectivity from the telephone system to the Link WTS. Each
MCU is hard-wired to one or more Base Stations, which in turn provides the wireless
link to each of the Wireless Telephones. The MCU establishes the connection from
the telephone line to the appropriate Base Station in order to reach a Wireless
Telephone.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
The MCU supports four Base Stations and up to 16 Wireless Telephones. Up to four
Link 150 MCUs can be linked together for extended coverage area. Chained MCUs
support up to 64 Wireless Telephones maximum.
SpectraLink offers an analog MCU that works with telephone systems (CO, PBX or
Key Systems) with analog (loop start) ports. We also offer digital MCUs that work
with the most common brands of telephone systems' (PBX or key systems) digital
ports.
• Base Stations – act as a radio transceiver to provide the communications signal
between the Wireless Telephone and the MCU. Base Stations are slightly larger than
a smoke detector and are typically mounted on the ceiling, in strategic locations
throughout the facility. A single Base Station can provide radio coverage for an area
of 5,000 to 50,000 square feet depending on building obstructions. Base Stations may
be located up to 2,200 cable feet from the MCU.
When a Wireless Telephone user makes or receives a call, the Wireless Telephone
and Base Station establish a digital radio communication link. As the user moves
around the coverage area, calls are “handed off” to the Base Station that is able to
provide the best radio signal (typically the closest Base Station). These handoffs
involve the Wireless Telephone establishing a communication link with another Base
Station and dropping the previous link.
• Link Wireless Telephones – communicate with the Base Station using digital
spread spectrum transmission at 902-928 MHz. Employees can carry Wireless
Telephones to keep in contact as they move throughout the building. The Wireless
Telephones use on-premises wireless technology; they are not cellular or satellite
phones. They are connected to the facility's existing telephone system and, just like
wired telephones, can receive calls directly, receive transferred calls, transfer calls to
other extensions, and make outside and long distance calls (subject to the restrictions
applied in your facility.)
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
2.2 The Front Panel of the Link 150 MCU
The MCU's front panel contains the connections to the telephone system, switches to
control system administration, and status LEDs.
1
ERROR
16
2
3
4
1
2
3
4
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
S
T
A
T
U
S
L
I
N
E
S
S
T
N
S
B
A
S
E
!
ADMIN
NORMAL
REGISTER
STEP
DEL / ENTER
IPC IN
IPC OUT
5
1
2
3
4
5
6
7
10
8
9
11
12
10
1. STEP Button – Selects a specific line or Base
Station during registration process.
2. Mode Switch – Selects the mode of operation for
the Link 150 MCU.
ADMIN: Administration mode, used to set up
system features to match features on the telephone
system.
NORMAL: Normal mode, used during day-to-day
operations.
REGISTER: Registration mode, used to add or
delete Wireless Telephones and Base Stations.
3. DEL/ENTER Button – Removes a registered
Wireless Telephone from the system.
4. IPC IN Port – Used to connect preceding MCUs in
a multi-MCU configuration.
5. IPC OUT Port – Used to connect sequential MCUs
in a multi-MCU configuration or to connect to an Open
Applications Interface (OAI) Telephony Gateway.
6. Error LED – Flashes when the system has detected
an error. When flashing, check the Status LEDs for an
error code.
7. Status LEDs – Indicate system error messages and
status. Refer to LED Status Codes for more
information.
8. Line LEDs – Indicate the line status of each
Wireless Telephone: ringing, in use, or not active.
9. Base Stn LEDs – Indicate the status of each Base
Station.
10. Conn A or B – RJ-21 connector to the cross-
connect demarc block. Connector B is supplied and
used only with 4 wire interface.
11. Power Jack – Connects to the AC adapter to
supply power to the system.
CAUTION: Use only the provided Class II AC Adapter
with output 24VDC, 1A.
12. Grounding Lug- For use on the analog interface
MCU (SCA-5XX).
PWR
CONN
B
CONN
A
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
3. Site Preparation
3.1 Required Materials
The following equipment must be provided by the customer.
1. Outlet Strip – Recommended for installations with more than one MCU. This
will allow the MCUs to be turned on and off together.
2. Cross-Connect Block – required to connect the telephone switch ports and the
Base Stations to the MCU.
3. 25 Pair Cables – RJ-21 male at MCU end, required to connect the MCU to the
cross-connect blocks.
4. Backboard space – the MCU is designed to be wall mounted to ¾” plywood
securely screwed to the wall.
5. Quick Clip Fuse – Required with an RCO410 Outdoor Base Station or when a
Base Station is located in a separate building from the Link 150 MCU.
Recommended Quick Clip Fuse is available from Illinois Tool Works, Linx
Division, Model # SCP-2X2.
6. Base Station Mounting Hardware – If the Base Stations will be mounted on
finished walls or ceilings, a 4-5" long ¼" bolt, nuts, and washers will be required
for each Base Station mounted.
3.2 Determine Location of MCU
Each MCU is approximately 2.75 inches wide, 12.5 inches high, and 7 inches deep, and
weighs about 5 pounds. The unit is designed to be wall mounted over ¾”plywood.
Select a location for the MCU with sufficient backboard space and an available outlet.
The MCU must be within 2,200 feet of the Base Stations.
All digital interface modules must be within 250 feet of the telephone system.
See your telephone system specifications for distance limitations for analog modules.
Since the front panel is used for cabling and as an operator's console, mount the units so
the front panel is accessible.
If your system has more than one MCU, the units should be mounted
vertically, side by side, physically touching the adjacent unit. Do not
stack units on top of one another. Stacked MCUs can cause overheating
and failure.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
4. Run Cable for System
4.1 Run Cables to Base Station Locations
The Base Station locations should be designated on the building floor plans provided to
the installer. Base Stations can be mounted easily on raised or acoustical ceiling tiles, or
on the wall. Avoid locating Base Stations in high or hard-to-reach places, as this will
hinder maintenance, testing, or repositioning.
Wire Specifications
The customer's wire contractor is responsible for adhering to all local codes
for wiring.
SpectraLink recommends UL-Listed Wire that conforms to the following specifications
for AWG, distance, and number of power pairs required for this installation.
Power
Pairs
Max Cable Feet
22 AWG
Max Cable
Feet
24 AWG
Max Cable
Feet
26 AWG
1 1,100 750 470
2 2,200 1,500 940
3 2,200 2,200 1,400
One additional pair is required for Data.
Attenuation must not exceed 6.8 dB/1,000 feet @ 772KHz.
Wire that is already installed (spare house cable) can be used when it is available. House
cable will usually run from the MDF in the telephone equipment room to Intermediate
Distribution Frames (IDFs) spread throughout the facility. Install new wire from the
closest IDF to the Base Station. Be sure no bridge taps, multiples, or “Y” connections are
created or present.
Determine the amount of wire needed to connect the Base Station to the MCU by scaling
from a floor plan or a sketch, pacing, measuring, or estimating. Remember to include
enough wire to reach the ceiling.
The wire length between the MCU and each Base Station may not exceed
2,200 cable feet.
Install an extra 25 feet of wire at the Base Station to allow for possible
relocation.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
4.2 Pull Cable
Pull the cable from the MCU location (usually in the telephone equipment room) to the
Base Station locations designated on the floor plans.
If the cabling exits the building, consult the telephone system manual, the
NEC, and local codes for instructions on providing lightning and other over-
current protection.
When cabling an external Base Station or a Base Station with wiring that
exits the building, protect all Base Station wiring with the Quick Clip Fuse
(Illinois Tool Works, Linx Division, SCP-2X2) before bridging with other
Base Station power leads.
Run all cable before attaching the RJ-45 connectors to the Base Stations. Label both the
demarcation block end and the Base Station end of each wire with the Base Station
number using a wire tie marker or other form of marker.
Remove bridge taps, multiples, or "Y" connections to the Base Station wires;
these will cause data transmission errors.
The area above some suspended ceilings is used as an environmental air
plenum. The National Electric Code requires that wire installed in plenums
be rated for plenum installation.
4.3 Terminate Cable at Base Station Locations
After running the wire to the Base Station location, terminate the wire using an RJ-45
modular crimp-on plug. Connect the data pair to pins 1 and 2 and the power pair to pins 7
and 8.
If the connection uses more than two pair, refer to the table on the following page.
To avoid damage to the connectors or crimps, be sure to run the wire to the
Base Station before connecting the RJ-45 connectors.
1
8
RJ-45 Modular Cable
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
When wiring the 8-pin connector, use the following table as a guide.
8-pin modular
connector
MCU Pin
Function
Polarity
1 Data 1 Any
2 Data 2 Any
3 Power 3 +
4 Power 2 -
5 Power 2 +
6 Power 3 -
7 Power 1 -
8 Power 1 +
4.4 Prepare Demarc Blocks
The MCU connects to the existing telephone system using RJ-21 connections. An MCU
is designed to operate with a specific interface to the telephone system: two wire digital
or analog, or four wire digital. The number of demarcation blocks required for the system
depends on the number and type of MCUs installed.
Interface Type MCU
Part Number
Wire
Pairs
# Blocks
Analog POTS SCA-5XX 1 1
Universal Digital Interface
(Norstar, Meridian, Comdial,
Fujitsu, Inter-Tel, DEFINITY 2-
wire, NEC, Rolm, Toshiba)
SCU-5XX 1 1
Merlin Legend and
DEFINITY 4-wire
SCF-5XX 2 2
Mitel (DNIC) SCX-5XX 1 1
Panasonic (Universal 2-wire
Auxiliary Digital)
SCP-5XX 1 1
Executone (Universal 4-wire
Auxiliary Digital)
SCB-5XX 2 2
If the wiring between the Link 150 MCU and the telephone system leaves the
building, consult your telephone system manual for instructions on providing
adequate lightning and other over-current protection. All MCUs (except the
analog interface SCA-5XX) are intended only for connection to the isolated
side of an on-premises telephone switch. The interfaces are intended to
connect to digital telephone switch ports that provide signals of 5Vp-p (max)
AC component and some telephone switches provide a 48 V DC offset.
Based on the number and type of interfaces in the system, determine the number of 25-
pair cables required to connect line ports and Base Stations to the demarcation blocks.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
The diagrams which follow provide an overview of the connections.
Multiple Power Pairs
Some sites may prefer to wire Base Stations to a separate demarc block in order to split
out power pairs.
Dedicated Line for Diagnostic Modem
The Link 150 MCU can be accessed remotely using an internal modem. To use the
modem for remote access, a dedicated dial-in line must be provided. On digital interface
systems this line must be terminated as a digital extension to the MCU.
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
Two Wire Analog or Digital Interface
The wiring diagram below shows the connections required for a two-wire analog or
digital interface.
Pair 17 Unused
Telephone Ports
Pair 1-16
Pair
18-19
Data Pair
20-23
Pair 24 & 25
Unused
Power Pairs
Base Stn. 1-4
Data Pairs
Base Stn. 1-4
To
Base Stations
To
PBX
A
Two Wire Analog or Digital Connection
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SpectraLink Corporation Installation and Operation
Link WTS – Link 150 M3 MCU
Four Wire Digital Interface
The wiring diagram below shows the connections required for a four-wire interface .
Each MCU of this type requires two demarcation blocks which will be wired as
indicated.
Pair 17 - Unused
A
B
Receive (RX)
To PBX
Telephone Ports
Pair 1-16
Pair 17-25 Unused
Transmit (TX)
From PBX
Telephone Ports
Pair 1-16
Power Pairs 18-19
Base Stn. 1-4
Data Pairs 20-23
Base Stn.1-4
Pair 24 & 25 Unused

To
PBX
To
Base Stations
Four Wire Digital Connection
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