SpectraLink 150 M3 MCU Operating instructions

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

SpectraLink Corporation Link WTS Installation and Operation
Part Number: 72-0075-01-C-W.doc Page ii
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
Wireless@work
LinkPlus
Link Wireless Telephone System
NetLink Wireless Telephone System
ccLink Wireless Telephone System
are trademarks and registered trademarks of SpectraLink Corporation.
All other trademarks used herein are the property of their respective owners.
Link 150 M3 Master Control Unit
System Documentation
© 2001 SpectraLink Corporation.
All Rights Reserved
Printed in the United States of America
SpectraLink Corporation
5755 Central Avenue
Boulder, CO 80301
303.440.5330 or
800.676.5465
www.spectralink.com

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Part Number: 72-0075-01-C-W.doc Page iii
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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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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Part Number: 72-0075-01-C-W.doc Page v
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 notifiedin advance to give
you an opportunity to maintain uninterrupted telephone service.
If you experience trouble with this telephone equipment, please contact:
SpectraLink Corporation
5755 Central Avenue
Boulder, CO 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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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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Warranty Support Program
World-class support for your Wireless Telephone System
Service
Overview The SpectraLink Warranty Support Program provides predictable no cost factory repair and telephone technical support for the first twelve months you
own your system. Services include overnight parts replacement for SpectraLink
infrastructure components, repair or replacement of defective Wireless
Telephones shipped within three-days of receipt at our factory, and technical
telephone support seven days a week, twenty-four hours a day, including
weekends and holidays. You can choose to upgrade your first year warranty on
either infrastructure or Wireless Telephones, or both. See details below.
Service
Coverage All models within the Link 150 and Link 3000 product families, Link WTS Base Stations, Wireless Telephones, and the full range of NetLink products.
Term Twelve (12) month warranty on hardware and software.
Service Features In conjunction with customer-provided on-site labor resources,SpectraLink
Warranty Support provides high-quality parts repair and at no additional
charge. SpectraLink uses a hotline as the first level of support to facilitate
problem solving and provide technical assistance. Telephone response is
immediate. Ensuing problems will be escalated according to established
policies to effect timely resolution of problems.
Telephone Technical Support is provided seven days a week, twenty-four
hours a day, including weekends and holidays. On-site technical support may
be purchased at $100 per hour during business days (8am to 5pm), and $150
per hour after business hours.
Software that fails in normal operation and/or does not conform to published
specifications will be repaired or replaced as appropriate.
After-Hours Remote Testing can be purchased at $750 per year. This service
option provides for SpectraLink to access their system via dial-up after hours
and perform diagnostics on all infrastructure equipment. Infrastructure failures
will be automatically logged and the customer notified the following business
morning.
Warranty
Upgrade Customers may upgrade the warranty repair of their Wireless Telephones from
three-day factory repair to advanced replacement. Customers may also increase
the level of support of their infrastructure to next business day on-site service
from advanced parts replacement, which includes after-hours remote diagnosis
at no additional charge.
SpectraLink
Responsibilities 1. Provide toll-free hotline telephone number for accessing SpectraLink
Technical Support and placing a service request.
2. Provide technical telephone assistance during the PPM.
3. Provide parts repair and replacement services in accordance with response
time commitments.
4. Provide 45 days prior written notice of the service period expiration.

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Customer
Responsibilities 1. Maintain the installation site and provide the necessary utility services for use of the Product in accordance with SpectraLink’s applicable published
specifications, see installation guide.
2. Provide all on-site labor necessary to assist SpectraLink in troubleshooting;
and for receiving, replacing, and returning all parts required to effect a
repair.
3. Provide unattended dial-up modem access to the system for remote
diagnosis by SpectraLink service personnel.
4. Customer will return to SpectraLink all defective equipment for which an
advanced shipment replacement has been made within ten business days.
Failure to return replaced items within the above-referenced period will
result in a customer obligation to pay full purchase price for the
replacement item.
Return Material
Authorization All equipment failures must be verified by a SpectraLink Customer Support representative and assigned a Return Material Authorization (RMA) number.
Replacement equipment will not be shipped without an RMA number assigned.
Equipment received by SpectraLink without an RMA number will be returned
to the customer without being repaired.
Exclusions The following services are not included under this Agreement:
1. Support of Products not listed under the Coverage section above.
2. On-site services performed by SpectraLink to effect repair.
3. Services required to repair Product which has been opened, disassembled,
or otherwise tampered with due to unauthorized attempts by persons other
than SpectraLink employees or persons authorized by SpectraLink to
install, repair, maintain, or modify the hardware or software.
4. Services required due to causes external to the SpectraLink maintained
Products including, but not limited to fire, flood, lightning, physical abuse,
immersion in liquids, or exposure to solvents.
5. Services in connection with the relocation of the Product, or the addition,
removal, or maintenance of other devices not furnished by SpectraLink,
including communications devices, networks, or links.
Termination SpectraLink requires 30-days written notice to cancel any optional services
purchased to upgrade the SpectraLink Warranty Support. Such written notice
must be on company stationary and indicate the date on which the cancellation
is to be effective. SpectraLink will credit the customer any unused prepaid
maintenance fees, calculated on a pro rata basis.

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Cleaning Tips for Wireless Telephones
Wireless Telephones may occasionally need to be cleaned to maintain appearance.
Generally, wiping the handset surface with a clean, water-dampened cloth or paper towel
will remove most films or residues. If the soiling is too stubborn for plain water, a mild
detergent solution may be used. Be sure to wipe away any detergent residue with a plain
water dampened cloth.
DO NOT IMMERSE WIRELESS TELEPHONES IN WATER OR OTHER LIQUID.
The Wireless Telephone may be cleaned with any general-purpose household glass and
surface type cleaner. Spray the cleaner on a soft cloth or paper towel, then wipe the
surface.
DO NOT SPRAY THE HANDSET DIRECTLY.
Pre-treated cloths, like those used for eyeglasses or cameras, may be used to clean the
Wireless Telephone. Pre-moistened towelettes may also be used. Avoid those containing
lanolin or aloe as it will leave a slippery residue.
The surface of the handset may be cleaned occasionally with disinfectants used for
general cleaning in a medical environment. Isopropyl alcohol may be used occasionally
applied by a damp cloth or paper towel. When using alcohol, do not rub the keypad
characters vigorously. Doing so will significantly degrade legibility.
•Do not use furniture polishes, waxes or plasticizer-based cleaner
(Armor All, etc.)
•Do not use lanolin, aloe, glycerin or other skin care type products.
•Do not apply any solvent such as acetone, mineral spirits etc.
•Do not directly spray or immerse the handset.
Should the headset connector become dirty, a scratchy or intermittent signal may be
experienced. To clean the connector, dip the non-padded end of either a wooden or paper
handled cotton swab in isopropyl alcohol. Gently insert in the connector and twist,
repeating several times. If available, blow compressed air into the connector to clear
debris.

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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 WIRELESS TELEPHONE SYSTEM OVERVIEW 3
2.1 SystemOperation 3
2.2 The Front Panel of the Link 150 M3 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
4.2 Pull Cable 8
4.3 Terminate Cable at Base Station Locations 8
4.4 Prepare Demarc Blocks 9
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
5. INSTALL LINK WIRELESS TELEPHONE SYSTEM 18
5.1 Survey Site 18
5.2 CheckComponents 18
5.3 Install MCUs 19
5.4 Install Base Stations 23
5.5 Install Outdoor Base Stations 25
6. CONNECT AND REGISTER WIRELESS TELEPHONES 26
6.1 Set Up Diagnostic Modem 26
6.2 Register Wireless Telephones 26
6.3 Unregister Wireless Telephones 27
6.4 ProgramWireless Telephone Features 28
6.5 Test Wireless Telephones 28

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7. SITE CERTIFICATION 29
8. SYSTEM ADMINISTRATION30
8.1 Troubleshoot Error Codes30
8.2 Troubleshoot Phone Features 30
8.3 Status LED Codes 31
8.4 Replace a Wireless Telephone 35
8.5 Replace an MCU 36
8.6 Replace a Base Station 37
9. WIRELESS TELEPHONE PLANNING WORKSHEET 38
10. BASE STATION LOCATION WORKSHEET 39
11. APPENDIX A: TECHNICAL PARAMETERS 40
11.1 Select Alternate Spread Spectrum Sequence 40
11.2 Change Companding 41
12. APPENDIX B: PROGRAM ANALOG FEATURES 42
12.1 Defining Macros 42
12.2 Plan Programming 42
12.3 Program Macro Codes 43
12.4 Examples of Programming 44
13. APPENDIX C: INSTALLING THE OPEN APPLICATIONS INTERFACE
(OAI) TELEPHONY GATEWAY 45
13.1 Before Installing the OAI Telephony Gateway 45
13.2 The OAI Telephony Gateway’s Front Panel 46
13.3 Mount Telephony Gateway to Wall 46
13.4 Initial Test 47
13.5 Connect the OAI Telephony Gateway to the MCU 48
13.6 Connect the OAI Telephony Gateway to the Application Server 49
13.7 Assign A Function Key to OAI Telephony Gateway 49
13.8 Certification Test 50

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1. About This Document
This document explains installation and operation of SpectraLink’s Link Wireless
Telephone System (WTS), using the Link 150 Model 3 (M3) Master Control Unit
(MCU). The Link 150 M3 MCU adds wireless service to your existing telephone system.
The installation process connects the Link Wireless Telephone System to your telephone
system, and activates SpectraLink Wireless Telephones.
1.1 Questions?
SpectraLink wants you to have a successful installation. If you have questions please
contact
SpectraLink 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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This table lists the installation steps and the person usually responsible for each step.
üü Task
Description Wire Contractor Installer System Admin
Site Preparation
Determine Location of MCU ü
Run Cable for System
Run Cable to Base Station Locations ü
Pull Cable ü
Terminate Cable at Base Station Locations ü
Prepare and Install Demarc Blocks ü
Assign and Program Ports ü
Connect Cables to Demarc Blocks ü
Install SpectraLink System
Survey Site and Check Components ü
Install MCUs ü
Install Base Stations ü
Install Outdoor Base Stations ü
Connect and Register Wireless
Telephones ü
Set Up Diagnostic Modem ü
Register Wireless Telephones ü
Program Wireless Telephone Features ü
Test Wireless Telephones ü
Site Certification ü

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2. Link Wireless Telephone System
Overview
Review this section if you are unfamiliar with the features and operation of the Link
Wireless Telephone System.
2.1 System Operation
The Link Wireless Telephone System (WTS) is a wireless communicationsystem 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.
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 Wireless
Telephone 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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The MCU supports four Base Stations and up to 16 Wireless Telephones. Up to four
Link 150 M3 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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2.2 The Front Panel of the Link 150 M3 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 registration process.
2. Mode Switch –Selects the mode of operation for
the Link 150 Wireless Telephone System.
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).

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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 M3 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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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
11,100 750 470
22,200 1,500 940
32,200 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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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.
RJ-45 Modular Cable

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When wiring the 8-pin connector, use the following table as a guide.
8-pin modular
connector MCU Pin Function Polarity
1Data 1 Any
2Data 2 Any
3Power 3 +
4Power 2 -
5Power 2 +
6Power 3 -
7Power 1 -
8Power 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 11
Universal Digital Interface
(Norstar, Meridian, Comdial,
Fujitsu, Inter-Tel, DEFINITY 2-
wire, NEC, Rolm, Toshiba)
SCU-5XX 11
Merlin Legend and
DEFINITY 4-wire SCF-5XX 22
Mitel (DNIC) SCX-5XX 11
Panasonic (Universal 2-wire
Auxiliary Digital) SCP-5XX 11
Executone (Universal 4-wire
Auxiliary Digital) SCB-5XX 22
If the wiring between the Link 150 M3 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-premise 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.