SpectraLink Link 150, Link 150 2 Installation And Operation Manual

The Link

 Wireless



Telephone System

Installation and Operation
Link 150 Model 2

Part Number: 72-0060-01
Issue B
May, 1999

SpectraLink Corporation Link 150 M2 Installation and Operation

Trademark Information

Comdial is a Registered Trademark of Comdial Corporation
DEFINITY is a Registered Trademark of Lucent Technologies Inc.
MERLIN LEGEND is a Registered Trademark of Lucent Technologies Inc.
Meridian is a Registered Trademark of Northern Telecom Ltd.
Mitel SX is a Registered Trademark of Mitel Corporation
Norstar is a Registered Trademark of Northern Telecom Ltd.
ROLMphone is a registered trademark of Siemens Business Communication Systems Inc.
Strata is a Registered Trademark of Toshiba America Information Systems, Inc.

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SpectraLink Corporation Link 150 M2 Installation and Operation

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 The SpectraLink Link 150 Wireless Telephone System contains no user-serviceable parts
inside. Refer servicing to qualified service personnel.

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 i f SpectraLink has be en advised, knew, or should have known of the
possibility of such damages.

SpectraLink is a trademark of SpectraLink Corporation.

SpectraLink Corporation

Link Wireless Telephone System Installation
© SpectraLink, 1999. All Rights Reserved
Printed in the United States of America
May 1999
Part Number 72-0060-01, Issue B

5755 Central Avenue
Boulder, CO 80301
[phone] or

800.676.5465
www.spectralink.com

08/11/99 Page i

SpectraLink Corporation Link 150 M2 Installation and Operation

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 te lephone wiring during a l ightning 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 Link 150 M2 Installation and Operation

FCC Information

The Master Control Unit Complies with Part 68, FCC Rules
FCC Registration Number IYGUSA-33816-PX-E
Ringer Equivale nce 0.3B
SpectraLink Corporation
Link 150 Model 2
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 Equival ence 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 Corp.
5755 Central Avenue
Boulder, Colorado 80301
303-440-5330
for information on obtaining service or repairs. 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 Link 150 M2 Installation and Operation

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 Number 2128-9760 A

Warranty and Repair Service Center:

SpectraLink Corp.
5755 Central Avenue
Boulder, Colorado 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 Link 150 M2 Installation and Operation

Table of Contents

1. ABOUT THIS DOCUMENT 1

1.1. Questions? 1

1.2. Icons and Conventions 1

1.3. Installation Overview 1

2. LINK 150 MODEL 2 OVERVIEW 3

2.1 System Operation 3

2.2 The Front Panel of the MCU 5

3. SITE PREPARATION 6

3.1 Required Materials 6

3.2 Determine Location of MCU 6

4. RUN CABLE FOR SYSTEM 7

4.1 Run Cables to Base Station Locations 7

4.1.1 Wire Specifications 7

4.2 Pull Cable 8

4.3 Terminate Cable at Base Station Locations 8

4.4 Prepare Demarc Blocks 9

4.4.1 Multiple Power Pairs 10

4.4.2 Dedicated Line for Diagnostic Modem 10

4.4.3 Two Wire Analog or Digital Interface 11

4.4.4 Four Wire Digital Interface 12

4.5 Install Demarc Blocks 13

4.6 Assign and Program Ports 13

4.7 Connect Cables from Base Stations and Phone Lines to Demarc Blocks 14

4.7.1 Two Wire Analog or Digital Demarc Block 15

4.7.2 Four Wire Digital Demarc Block 16

5. INSTALL SPECTRALINK SYSTEM 18

5.1 Survey Site 18

5.2 Check Components 18

5.3 Insta ll MCUs 19

5.3.1 Mount MCUs to Wall 19

5.3.2 Connect MCU to Demarc Blocks 19

5.3.3 Connect Multi-Unit Systems 20

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SpectraLink Corporation Link 150 M2 Installation and Operation

5.3.4 Connect Power 21

5.4 Install Base Stations 22

5.4.1 Mount Base Stations on Dropped Tile Ceilings 22

5.4.2 Mount Base Stations On Finished Ceilings 23

5.5 Install Outdoor Base Stations 24

5.5.1 Wire and Connect Outdoor Base Stations 24

6. CONNECT AND REGISTER WIRELESS TELEPHONES 25

6.1 Set Up Diagnostic Modem 25

6.2 Register Wireless Telephones 25

6.3 Unregister Wireless Telephones 27

6.4 Program Wireless Telephone Features 27

6.5 Test Wireless Telephones 27

7. SITE CERTIFICATION 28

8. SYSTEM ADMINISTRATION 29

8.1 Troubleshoot Error Codes 29

8.2 Troubleshoot Phone Features 29

8.3 Status LED Codes 30

8.3.1 Wireless Telephone Status Indicator Messages 32

8.4 Replace a Wireless Telephone 33

8.4.1 Delete Old Wireless Telephone 33

8.4.2 Register New Wireless Telephone 33

8.5 Replace an MCU 34

8.5.1 Clear Configuration on Replacement MCU 34

8.5.2 Connect the Replacement MCU 34

8.6 Replace a Base Station 35

A. TECHNICAL PARAMETERS 37

B. PROGRAM ANALOG FEATURES 39

Open Application Interface 39

2. Plan Programming 39

3. Program Macro Codes 40

C. INSTALLING THE OPEN APPLICATIONS INTERFACE (OAI) GATEWAY42

Before Installing the OAI Gateway 42
The OAI Gateway’s Front Panel 43

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SpectraLink Corporation Link 150 M2 Installation and Operation

1. Mount Gateway to Wall 43

2. Initial Test 44

3. Connect the OAI Gateway to the MCU 45

4. Connect the OAI Gateway to the Application Server 46

5. Assign A Function Key to OAI 46

6. Certification Test 47

C. WIRELESS TELEPHONE PLANNING WORKSHEET 48

D. BASE STATION LOCATION WORKSHEET 50

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SpectraLink Corporation Link 150 M2 Installation and Operation

1. About This Document

This document explains installation and operation of SpectraLink’s Link Wireless
Telephone System (WTS), Link 150, Model 2. The Link 150 Model 2 adds wireless
service to your existing telephone system. The installation process connects the Link 150
to your telephone system, and activates the Link Wireless Telephones.

1.1. Questions?

SpectraLink wants you to have a successful installation. If you have questions please
contact 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 Link 150 M2 Installation and Operation

This table lists the installation steps and the person usually responsible for each step.

Site Preparation

Determine Location of MCU

Run Cable for System

Run Cable to Base Station Locations

Pull Cable

Terminate Cable at Base Station Locations

Prepare and Install Demarc Blocks

Assign and Program Ports

Connect Cables to Demarc Blocks

Install SpectraLink System

Task

Description

Wire

Contractor

Installer

System

Admin

Survey Site and Check Components

Install MCUs

Install Base Stations

Install Outdoor Base Stations

Connect and Register Wireless Telephones

Set Up Diagnostic Modem

Register Wireless Te le phones

Program Wireless Telephone Features

Test Wireless Te le phones

Site Certification

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SpectraLink Corporation Link 150 M2 Installation and Operation

2. Link 150 Model 2 Overview

Review this section if you are unfamiliar with the features and operation of the Link 150

Model 2.

2.1 System Operation

The Link 150 Wireless Telephone System (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 the Link Wireless Telephone. This diagram shows an overview of
system. Components are described below.

Base Station Base Station

Existing

Telephone

Base Station

System

STEP

ADMIN

NORMAL

Link150

REGISTER

DEL / ENTER

IPC IN

MCU

IPC OUT

CONN

B

STATUS

LINES

CONN

A

STNS
BASE

PWR

!

Telephone Room

Wireless

Telephones

Desksets

The Link 150 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 wireless system.
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 Link 150 M2 Installation and Operation

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-premise 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 Link 150 M2 Installation and Operation

2.2 The Front Panel of the MCU

The MCU's front panel contains the connections to the telephone system, switches to
control system administration, and status LEDs.

1. STEP Button – Selects a specific line or Base

Station during re gi st ration proce ss.

S

ADMIN

NORMAL

REGISTER

DEL / ENTER

IPC IN

IPC OUT

CONN

B

10

CONN

A

10

STEP

1

2

3

4

5

ERROR
1

S

2

T
A

3

T
U

4

S

5

1
2
3
4
5
6
7

L

8

I

N

9

E
S

10
11
12
13
14
15
16

1

S

B

2

T

A

N

S

3

S

E

4

PWR

!

6

7

8

9

11

2. Mode Switch – Selects the mode of operation
for the Link 150 system.

ADMIN: Administration mode, used to set
up system features to match features on the
telephone system.

NORMAL: Normal mode, used during day­to-day operations.

REGISTER: Registration mode, used to
add or delete Wireless Telephones and Base
Stations.

3. DEL/ENTER Button – Removes a registered
Wireless Telep hone 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)
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 T elephone: 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 cross­connect 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.

Use only the provided Class II AC
Adapter with output 24VDC, 1A.

12

08/11/99 Page 5

12. Grounding Lug- For use on the SCA

408/416.

SpectraLink Corporation Link 150 M2 Installation and Operation

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 PBX 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. 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.
Since the front panel is used for cabling and as an operator's console, mount the units so

the front panel is accessible.
The MCU must be within 2,200 feet of the Base Stations.

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 Link 150 M2 Installation and Operation

4. Run Cable for System

4.1 Run Cables to Base Station Locations

The Base Station locations should be designated on the building floorplans 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.

4.1.1 Wire Specifications

The customer's wire contractor is responsible for adhering to all local codes







SpectraLink recommends UL-Listed Wire that conforms to the following specifications
for AWG, distance, and number of power pairs required for this installation.

for wiring.

Power

Pairs

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 floorplan or a sketch, pacing, measuring, or estimating. Remember to include
enough wire to reach the ceiling.

Max Cable

Feet

22 AWG

Max Cable

Feet

24 AWG

Max Cable

Feet

26 AWG

The wire length between the MCU and each Base Station may not exceed







08/11/99 Page 7

2,200 cable feet.
Install an extra 25 feet of wire at the Base Station to allow for possible

relocation.

SpectraLink Corporation Link 150 M2 Installation and Operation

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 floorplans.

If the cabling exits the building, consult the telephone system manual, the
NEC, and local codes for instructions on providing lightning and other over­current 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

Page 8 08/11/99

RJ-45 Modular Cable

SpectraLink Corporation Link 150 M2 Installation and Operation

When wiring the 8-pin connector, use the following table as a guide.

8-pin modular

connector

1 Data 1 Any
2 Data 2 Any
3Power 3 +
4Power 2 ­5Power 2 +
6Power 3 ­7Power 1 ­8Power 1 +

MCU Pin

Function

Polarity

4.4 Prepare Demarc Blocks

The MCU is connected 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 Interface Modules to be installed.

Interface Type MCU

Part Number

Wire
Pairs

# Blocks

Analog POTS SCA-416/SCA-408 1 1
Comdial SCC-416/SCC-408 1 1
DEFINITY SCD-416/SCD-408 1 1
Merlin Legend SCL-416/SCL-408 2 2
Mitel (DNIC) SCX-416 1 1
NEC SCE-41611
Nortel Meridian SCM-416/SCM-408 1 1
Nortel Norstar SCN-416/SCN-408 1 1
Siemens Rolm SCS-416/SCS-408 1 1
Toshiba SCK-416/SCK-408 1 1

If the wiring between the Link 150 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
SCA-416 and SCA-408) are intended only for connection to the isolated side
of an on-premise PBX. The interfaces are intended to connect to digital PBX
ports that provide signals of 5Vp-p (max) AC component and some PBXs

provide a 48 V DC offset.
Based on the number and type of interfaces in the system, determine the number of 25­pair cables required to connect line ports and Base Stations to the demarcation blocks.

08/11/99 Page 9