Mitel 3000 Manual

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Installation and Maintenance.
MITEL
3000

Mitel 3000
Installation & Maintenance Manual
Table of Contents
TABLE OF CONTENTS ..................................................................................................................................... 1
FCC INFORMATION.......................................................................................................................................... 1
SAFETY REGULATIONS.................................................................................................................................. 4
INTRODUCTION ................................................................................................................................................ 6
GENERAL OVERVIEW..................................................................................................................................... 6
SAFETY PRECAUTIONS DURING INSTALLATION AND SYSTEM UPGRADES ............................................................. 6
ELECTROSTATIC PRECAUTION (ESP) ................................................................................................................... 7
LIGHTNING AND SURGE VOLTAGE PROTECTION ................................................................................................... 7
INSTALLATION STEPS ........................................................................................................................................... 8
INSTALLING THE MAIN EQUIPMENT ........................................................................................................ 9
EQUIPMENT LOCATION ........................................................................................................................................ 9
MOUNTING THE CCU .......................................................................................................................................... 9
MODULES LOCATED IN THE CCU............................................................................................................. 12
MODULE LOCATION ........................................................................................................................................... 12
INSTALLING THE BACKPLANE WALL BRACKET .................................................................................................. 13
MOUNTING THE CCU WITH TWO BRACKETS...................................................................................................... 13
MOUNTING THE BACKPLANE ............................................................................................................................. 14
EXPANSION MODULES.................................................................................................................................. 15
REMOVING THE 008 MODULE FROM THE BACKPLANE........................................................................................ 16
INSTALLING THE 008 MODULE ONTO THE BACKPLANE ...................................................................................... 17
INSTALLING AN EXPANSION MODULE................................................................................................................. 17
CO LINE MODULE ............................................................................................................................................. 17
CO LINE MODULE ............................................................................................................................................. 18
EXTERNAL MUSIC-ON-HOLD MODULE...................................................................................................22
T1/E1 PRI MODULE......................................................................................................................................... 22
CONNECTING THE BATTERY-BACKUP-UNIT (BBU) TO THE SYSTEM........................................... 23
CONNECTING THE BATTERY ..................................................................................................................... 24
SIXTEEN KEY FEATURE PHONE .......................................................................................................................... 25
EIGHT KEY FEATURE PHONE.............................................................................................................................. 25
EIGHT KEY FEATURE PHONE.............................................................................................................................. 26
DIRECT STATION SELECTION (DSS) UNIT.......................................................................................................... 28
CLIP, PEDESTAL AND INSTALLATION OF THE DSS ............................................................................................. 29
WALL-MOUNTING THE FEATURE PHONES.......................................................................................................... 30
DOOR PHONE ..................................................................................................................................................... 31
CABLING THE UNIT ....................................................................................................................................... 32
CONNECTING THE EXTENSIONS.......................................................................................................................... 33
CONNECTING T1/E1 PRI TRUNKS ..................................................................................................................... 34
STRUCTURED WIRING........................................................................................................................................ 35
CCU CONNECTIONS........................................................................................................................................... 36

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Installation & Maintenance Manual
DOOR PHONE ..................................................................................................................................................... 36
DOORSTRIKE...................................................................................................................................................... 36
CONNECTING A PA (PUBLIC ADDRESS) AMPLIFIER ........................................................................................... 36
CONNECTING A PC OR PRINTER TO THE SERIAL PORT....................................................................................... 37
CENTRAL BELL .................................................................................................................................................. 37
EXTENSION MODULE MDF CONNECTIONS........................................................................................................ 37
BROADBAND MODULE CONNECTIONS................................................................................................... 38
EXPANDING AN EXISTING SYSTEM.......................................................................................................... 39
INSTALLING AN ADDITIONAL CO LINE MODULE ............................................................................................... 39
INSTALLING ADDITIONAL EXTENSION MODULES OR A BROADBAND MODULE .................................................. 39
T1/E1 MODULE ON THE MITEL 3000.......................................................................................................... 40
TI (RBS) SETTINGS ........................................................................................................................................... 40
FRAMING AND CODING ON T1 (RBS) ................................................................................................................ 41
LINE BUILD OUT................................................................................................................................................ 41
LINE GAIN ......................................................................................................................................................... 41
DTMF OR PULSE DIALING ................................................................................................................................. 41
RECEIVED DIGITS .............................................................................................................................................. 41
PROGRAMMING REQUIRED FOR T1 PRI (ISDN)................................................................................................. 42
PROGRAMMING THE Q 931 PROTOCOL ON PRI (ISDN) ..................................................................................... 42
LINE BUILD OUT PROGRAMMING ON PRI (ISDN) ............................................................................................. 42
LINE GAIN PROGRAMMING FOR PRI (ISDN) ..................................................................................................... 42
ADDITIONAL PROGRAMMING OPTIONS FOR T1 PRI (ISDN)............................................................................... 42
ADDITIONAL T1 PRI (ISDN) INFORMATION ........................................................................................... 43
ISDN (PRI) CALLED PARTY NUMBER - CALL TYPES........................................................................................ 43
ISDN T1 (PRI) CALLING PARTY NUMBER - CALL TYPE................................................................................... 44
DIALING NUMBERS ON ISDN (PRI) ................................................................................................................... 44
CALLER ID RESTRICTION OVERRIDE .................................................................................................................. 44
TRANSIT NETWORK SELECTION ON ISDN (T1 PRI) .......................................................................................... 44
RELEASE COMPLETE .......................................................................................................................................... 44
T1/ PRI DIAGNOSTICS.................................................................................................................................... 45
ALARM INDICATIONS......................................................................................................................................... 45
DMS EXCHANGE – LT1 FLAG .......................................................................................................................... 46
PROGRAMMING REQUIRED FOR E1 PRI (ISDN).................................................................................... 46
PROGRAMMING THE NUMBER OF CHANNELS (NO. CHANNELS)......................................................................... 47
PROGRAMMING THE CRC-4............................................................................................................................... 47
HOT SWAPPING FAULTY MODULES..................................................................................................................... 48
REPLACING A FAULTY MODULE MDF................................................................................................................ 49
REPLACING FAULTY PCBS.......................................................................................................................... 49
REPLACING FAULTY PCBS.......................................................................................................................... 50
REPLACING THE 008 EXTENSION BOARD ........................................................................................................... 50
POWER SUPPLY UNIT SPARE FUSE ...................................................................................................................... 51
POWER SUPPLY UNIT SPARE FUSE ...................................................................................................................... 52
REPLACING THE CCU MDF .............................................................................................................................. 53
POWER UP AND TEST.................................................................................................................................... 55
SWITCH ON ........................................................................................................................................................ 55
GETTING STARTED........................................................................................................................................ 55

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Installation & Maintenance Manual
ESSENTIAL PROGRAMMING....................................................................................................................... 56
EQUIPPED CO LINES .......................................................................................................................................... 56
INCOMING RINGING............................................................................................................................................ 56
CALL RESTRICTION ............................................................................................................................................ 57
INDIVIDUAL FEATURE PHONE PROGRAMMING.................................................................................. 57
SYSTEM PROGRAMMING FROM THE PROGRAMMING TELEPHONE ........................................... 61
“SYSTEM” PROGRAMMING OPTIONS. ................................................................................................................. 63
“EXTENSIONS” PROGRAMMING OPTIONS. .......................................................................................................... 67
“LINES” PROGRAMMING OPTIONS...................................................................................................................... 70
“SYSTEM” PROGRAMMING......................................................................................................................... 71
TIME AND DATE................................................................................................................................................. 71
TO CHANGE THE SYSTEM PROGRAMMING PASSWORD ...................................................................................... 71
TO CHANGE THE PROGRAMMING EXTENSION.................................................................................................... 72
NIGHT SERVICE ................................................................................................................................................. 72
MUSIC-ON-HOLD OPTIONS ................................................................................................................................73
TO CONFIGURE LINE KEY LIGHTS ..................................................................................................................... 73
CHANGE GREETINGS ......................................................................................................................................... 73
PROGRAMMING SYSTEM TIMERS ....................................................................................................................... 75
LOCAL CODES (7 NUMBER DIGIT DIALING) ........................................................................................................ 78
REMOTE NOTIFICATION OF VOICE MESSAGES ................................................................................................... 79
TO RESET THE SYSTEM...................................................................................................................................... 81
ENHANCED EMERGENCY SERVICE..................................................................................................................... 83
EXTENSION PROGRAMMING...................................................................................................................... 85
ASSIGNING EXTENSION NAMES ......................................................................................................................... 85
TO CONFIGURE DISCONNECTED EXTENSIONS ................................................................................................... 87
SEND SPECIFIC DID........................................................................................................................................... 92
LINE PROGRAMMING ................................................................................................................................... 97
OUTGOING GROUPS ......................................................................................................................................... 101
E1 PRI INTERFACE...................................................................................................................................... 108
PROGRAMMING THE SERVICE TYPES ............................................................................................................... 110
DID LINE TYPE - SERVICE TYPES.................................................................................................................... 111
LOOP START LINE TYPE - SERVICE TYPES....................................................................................................... 111
GROUND START LINE TYPE - SERVICE TYPES ................................................................................................. 111
PROGRAMMING THE START TYPES .................................................................................................................. 111
RECOMMENDATIONS FOR CUSTOMER TRAINING........................................................................... 116
TROUBLESHOOTING................................................................................................................................... 117
SYSTEM NOT INITIALIZING ............................................................................................................................... 117
NO INCOMING CALLS ....................................................................................................................................... 117
EXTENSION OUTGOING LOCKED....................................................................................................................... 117
NO EXTENSION DIAL TONE ............................................................................................................................... 117
NOT SEIZING A LINE FOR OUTGOING CALLS...................................................................................................... 117
DOOR PHONE NOT OPERATING......................................................................................................................... 117
PHONE RESET................................................................................................................................................... 117
SYSTEM RESET................................................................................................................................................. 117
ADDITIONAL TROUBLESHOOTING INFORMATION ............................................................................................. 118
SOFTWARE UPGRADE INSTRUCTIONS.................................................................................................. 124

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UPGRADING SYSTEMS AND RESTORING DATABASES WHEN UPGRADING TO T1/E1 PRI.... 125
TECHNICAL SPECIFICATION.................................................................................................................... 126
INDEX ............................................................................................................................................................... 128

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1
FCC INFORMATION
FCC Part 68 Exhibit J
This equipment complies with Part 68 of the FCC rules and the requirements adopted by the ACTA. On the
exterior of the cabinet of this equipment is a label that contains, among other information, a product identifier in
the format LKCPF09BENCORECX. If requested, this number must be provided to the telephone company.
• FCC Registration Number: LKCPF09BENCORECX
• Ringer Equivalence Number (REN): 0.9B
• Facility Interface Code (FIC): 9.0Y
• Service Order Code (SOC): 02LS2
• USOC Jack Type: RJ11
A FCC compliant telephone cord and modular plug is provided with this equipment. This equipment is designed
to be connected to the telephone network or premises wiring using a compatible modular jack that is Part 68
compliant. See Installation Instructions for details.
The REN is used to determine the quantity of devices that may be connected to the telephone line. Excessive
RENs on the telephone line may result in the devices not ringing in response to an incoming call. Typically, the
sum of RENs should not exceed five (5.0). To be certain of the number of devices that may be connected to a
line (as determined by the total RENs) contact the local telephone company.
If this equipment MITEL 3000 causes harm to the telephone network, the telephone company will notify you in
advance that temporary discontinuance of service may be required. But if advance notice isn't practical, the
telephone company will notify the customer as soon as possible. Also, you will be advised of your right to file a
complaint with the FCC if you believe it is necessary.
The telephone company may make changes to its facilities, equipment, operations or procedures that could affect
the operation of the equipment. If this happens the telephone company will provide advance notice so you can
make the necessary modifications to maintain uninterrupted service.
If the equipment is causing harm to the telephone network, the telephone company may request that you
disconnect the equipment until the problem is resolved.
Connection to party line service is subject to state tariffs. (Contact the state public utility commission, public
service commission or corporation commission for information.)
CAUTION
THE TELEPHONE INSTRUMENTS SPECIFICALLY DESIGNED FOR THIS SYSTEM
HAVE HEARING-AID COMPATIBLE HANDSETS THAT ARE IN COMPLIANCE WITH
SECTION 68.316 OF THE FCC RULES.

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Customer Owned Coin/Credit Card Phones
To comply with state tariffs, the telephone company must be given notification prior to connection. In some
states, the state public utility commission, public service commission or corporation commission must give prior
approval of connection.
Data Equipment
The table below shows which jacks are associated with which modes of operation:
Mode of Operation USOC Jack
Permissive RJ11C
Programmable RJ41S and RJ45S
Systems
Facility Interface Codes (FIC), Service Order Codes (SOC), USOC Jack Codes and Ringer Equivalence
Numbers (REN) are shown in the table below for each port where applicable:
Port FIC SOC USOC Jack REN
PSTN 9.0Y 02LS2 RJ11 0.9B
ISDN _PRI RJ45
ADSL RJ11
Adjuncts – KX and PX Devices
When this adjunct is used with a leased system, permission of the owner should be requested for connection of
the adjunct.
KX-type telephones with message waiting lights and/or line status indicators can only be connected to host
equipment and never directly to the network.
KX devices can only be installed with the permission of the owner of the host equipment as “surgery” is often
required on the host system.
OEM Devices
The mounting of the certified unit in the final assembly must be made so that the certified unit is isolated from
exposure to any hazardous voltages within the assembly. Adequate separation and restraint of cables and cords
must be provided.
The circuitry from the certified unit to the telephone line must be provided in wiring that carries no other
circuitry unless specifically allowed by the rules (such as PC and PR leads). PC board traces carrying tip and
ring leads shall have sufficient spacing to avoid surge breakdown.
If the certified device is enclosed in an assembly, and is not readily accessible, the certification label must be
placed on the exterior of the cabinet for each type of certified device contained therein.
The final assembler must provide all applicable material (contained in this section) with the final equipment.
A modular plug or jack must be provided which complies with Part 68, Subpart F requirements for dimensions,
tolerances and metallic plating.

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WARNING
This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict
accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has
been type tested and found to comply with the limits for a Class A computing device in accordance with the
specifications in Subpart J of Part 15 of FCC Rule. Operation of this equipment in a residential area may cause
unacceptable interference to radio and TV reception requiring the operator to take whatever steps are necessary
to correct the interference. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
• Reorient the receiving antenna
• Relocate the CCU with respect to the receiver
• Check that the CCU and receiver are not on the same circuit; the CCU must be powered from an isolated,
dedicated AC outlet
If necessary, the user should consult the dealer or an experienced radio/television technician for
additional suggestions. The user may find the following booklet prepared by the FCC helpful: “How to
Identify and Resolve Radio-TV Interference Problems”
This booklet is available from the U.S. Government Printing Office, Washington, D.C. 20402, Stock No.
004-000-00398-5. If RFI problems persist, contact Mitel Customer Support.

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Safety Regulations
Important Safety Instructions
The following safety information is reprinted from UL 1459. When using your telephone equipment, basic safety
precautions should always be followed to reduce the risk of fire, electric shock, and injury to persons, including
the following:
1. Read and understand all instructions.
2. Follow all warnings and instructions marked on the product.
3. Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners.
Use a damp cloth for cleaning.
4. Do not use this product near water (for example, in a wet basement).
5. Do not place this product on an unstable cart, stand, or table. The product may fall, causing serious
damage to the product.
6. Slots and openings in the cabinet and the back or bottom are provided for ventilation, to protect it from
overheating; these openings must not be blocked or covered. This product should never be placed near or
over a radiator or heat register. This product should not be placed in a built-in installation unless proper
ventilation is provided.
7. This product should be operated only from the type of power source indicated in the manual. If you are
not sure of the type of power source to your building, consult your dealer or local power company.
8. This product is equipped with a three-wire grounding type plug, a plug having a third (grounding) pin.
This plug will only fit into a grounding type power outlet. This is a safety feature. If you are unable to
insert the plug into the outlet, contact your electrician to replace your obsolete outlet. Do not defeat the
safety purpose of the grounding type plug.
9. Do not allow anything to rest on the power cord. Do not locate this product where the cord will be abused
by persons walking on it.
10. Do not use an extension cord with this product's AC power cord. The AC outlet for this product should
not be used for any other electrical equipment.
11. Never push objects of any kind into this product through cabinet slots as they may touch dangerous
voltage points or short out parts that could result in a risk of fire or electric shock. Never spill liquid of
any kind on the product.
12. To reduce the risk of electric shock, do not disassemble this product, but take it to a qualified serviceman
when some service or repair work is required. Opening or removing covers may expose you to dangerous
voltages or other risks. Incorrect reassemble can cause electric shock when the product is subsequently
used.
13. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the
following conditions:
• When the power supply cord or plug is damaged or frayed.
• If liquid has been spilled into the product.
• If the product has been exposed to rain or water.
• If the product does not operate normally by following the operating instructions.
• Adjust only those controls that are covered by the operating instructions because improper adjustment
of other controls may result in damage and will often require extensive work by a qualified technician
to restore the product to normal operation.
• If the product has been dropped or the cabinet has been damaged.

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• If the product exhibits a distinct change in performance.
14. Avoid using a telephone (other than a cordless type) during an electrical storm. There may be a remote
risk of electric shock from lightning.
15. Do not use the telephone to report a gas leak if the telephone is in the vicinity of the leak.
Save These Instructions

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6
Introduction
This document describes the practices to be adopted by certified field technicians during installation and
maintenance of the Mitel 3000. A more detailed description of the product, along with customer programmable
facilities and features, may be found in the Administrator's manual, which should be read in conjunction with
this document.
NOTICE
This Mitel 3000 Installation Manual instructs field technicians on the proper installation practices for
the Mitel 3000 System. This manual does not provide step-by-step instructions for premises wiring
practices as dictated by the National Electrical Code, which includes, but is not limited to, cable
layouts, cable installation, AC power installation, proper AC grounding, eliminating or preventing
external interferences (including, but not limited to, RFI, EMI, lightning, AC power disturbances,
static discharge), and other telephony practices standard within the industry. Cable installers,
electricians, and field technicians are expected to be properly trained and, if applicable, licensed in
their trade practices.
General overview
• "The Mitel 3000 is a scalable business communications platform that supports up to 40 users.
• "The Mitel 3000 is a hybrid PABX/key-system, which may be equipped with Feature Phones or standard
two-wire DTMF telephones. Extensions can also be equipped with fax or answering machines.
• The Mitel 3000 is modular in construction and can be upgraded by adding system expansion modules
(Expansion Modules and Broadband Module).
• The Mitel 3000 is a versatile, easy-to-use system, which is simple to install and maintain.
• The Mitel 3000 Broadband Module provides data connectivity to the Internet via DSL lines or Cable
Modems. It also provides an internal LAN. Up to 12 IP extensions and VoIP trunks are also supported.
Safety Precautions during installation and system upgrades
Always unplug or isolate the main supply when installing or upgrading the
system.
After installing the Central Control Unit (CCU) and all required modules,
ensure that the following points are checked before switching the main AC
power source on:
• The cabled extensions have a DTMF telephone or a Feature Phone connected.
• The CCU cover is in place and locked.
After switching on the main AC power source, allow at least thirty seconds for the CCU to go through its power
up routine.

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Electrostatic precaution (ESP)
The Mitel 3000 contains electrostatic components. To ensure long-term reliability of the system, electrostatic
precautions should be taken when handling any of the system PCBs (Printed Circuit Boards) that are not enclosed
in plastic.
Lightning and surge voltage protection
Extension cabling should not be exposed to high voltage surges (for example, surges
induced by lightning or neighboring high current-carrying cables). If this is a possibility,
external protection of the main equipment and extensions using earthed line surge
protectors is essential.

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Installation steps
Carry out the following steps to install the system:
FIRST, read the safety and precaution information on page 6 carefully.
SECOND, mount the Main Equipment as detailed in the section starting on page 9.
THIRD, install the CO line, T1/E1 PRI Module, Expansion Modules, and Broadband Module as required.
An Expansion Module must be installed if the following is required:
• More than 8 extensions
• More than four CO lines
A Broadband Module must be installed if an internal LAN or connection to a DSL Line or Cable Modem is
required. It must also be fitted if IP extensions/VoIP trunks are to be provided.
A Voice Module must be installed to provide Voice Mail, Customized Courtesy Service, Directory Service or
Auto-Attendant functionality.
The Battery Back Up module and battery must be installed if battery back up is required.
FOURTH, cable the extensions to the Main Equipment and install the system Feature Phones and
standard telephones as detailed in the Cabling Section starting on page 32. This section also covers
installation of the following:
• Door Phone
• Doorstrike
• External Music-On-Hold
• Public Address
• RS232 Interface to provide Call Logging
FIFTH, cable the CO line connections as detailed in the cabling section starting on page 32.
SIXTH, Power up the system and provide customer training as detailed on page 116.

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Installing the main equipment
Equipment location
The equipment is intended for installation in a residential or office-type environment. It needs to be mounted at a
convenient working height on a dry, flat wall. The normal height is 5 feet from the floor to the bottom of the case.
Do not place the CCU where it will be subjected to excessive levels of heat, dust or high
humidity. Locating the equipment near sources of electromagnetic radiation, such as
heavy electrical switchgear, lift machinery or electric arc welders, should be avoided.
Allow at least six inches of free space all around the CCU for ventilation.
The CCU needs to be located within six feet of an isolated, dedicated power supply outlet. The CCU must not
share the same main supply socket with any other electrical appliance.
Mounting the CCU
When a suitable location has been found, mark the screw locations on the mounting surface, using the mounting
bracket provided.
If the CCU is being mounted on masonry or plasterboard, suitable wall plugs must be used. Drill and plug four
holes in the wall at the marked locations. The holes should be deep enough to accept a one-inch screw.
Wall mount bracket

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CCU Mounting bracket clearances
The main unit is mounted on a wall using the bracket supplied and should have top and side clearance as
shown below.
CCU Mounting Bracket
If the system is to be equipped with an Expansion or Broadband Module, then two mounting brackets need
to be installed.
CCU Bracket + Backplane Bracket
300mm min

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Mounting the CCU
The CCU is mounted on the bracket by sliding it on from the left-hand side. The marks on the side of the
CCU must be lined up with the flanges on the wall bracket as shown below before sliding the CCU into
place. When you slide it fully to the right-hand side of the bracket, the CCU is automatically locked in place.
To remove the CCU, depress the lock located on the left-hand side of the wall bracket. Slide the CCU to the
left to remove it from the bracket.
300mm min

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Modules located in the CCU
There are a number of modules that can be installed in the CCU.
• CO Line Module (Colored Black). This provides two CO lines. Up to two of these modules can be installed in
the CCU to provide two or four CO lines.
There are two slots in the CCU for the CO Line modules.
• Voice Module two, four or eight port (Colored Blue). Only one of these modules can be inserted in a unit.
• T1/E1 PRI Module (Colored Yellow). This module provides for a T1/Primary Rate ISDN (PRI) interface.
When a T1/E1 PRI Module is installed, the unit can be further equipped with one or two
CO line modules to provide backup in the event T1/E1 PRI Module fails.
Module location
The CO line, Voice and T1/E1 PRI Module locations in the CCU are indicated below.
CO Module 2
CO Lines 3 and 4
Voice Module
T1/E1 PRI Module
CO Module 1
CO Lines 1 and 2

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System Expansion
To equip the switch with more than eight extensions, two CO Line Modules or a Broadband Module, a
backplane, mounted on a second wall bracket, is needed.
The power must be disconnected to install the backplane or expansion modules.
Installing the Backplane wall bracket
The CCU and backplane brackets are identical. However, when both are installed, the backplane bracket is
inverted so that it meshes closely with the CCU bracket.
Locate the second bracket and mark the screw holes. Drill and plug the holes in the wall at the marked locations.
The holes should be deep enough to accept a one inch screw.
Mount the second bracket ensuring the two brackets are correctly interlocked and that sufficient clearance is
provided on all sides.
Mounting the CCU with two brackets
Slide the CCU on to the brackets from the left-hand side.
Ensure that the locking mechanism is activated.

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Mounting the Backplane
Slide the backplane on from the right-hand side.
Ensure the connector is fully mated with the CCU.
Securing the backplane to the wall bracket
A mounting screw is used to securely locate the backplane on the wall bracket. This provides additional rigidity
to ensure the backplane and CCU connectors do not move.
Remove the fourth and fifth cover from the backplane.
Locate the backplane on the bracket and connect it to the CCU.
The backplane must be fully connected to the CCU to correctly locate the mounting screw hole.
Insert the screw into the pillar on the bracket, which can be seen through the backplane mounting screw hole.
Mounting screw
hole

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Expansion modules
There are two types of expansion modules that can be installed on the backplane. These are the Expansion
Module and the Broadband Module. These modules are installed in the same way.
The Expansion Module is also equipped with two connectors for the CO Line modules.
The power must be disconnected when installing the backplane or expansion
modules.
Expansion Module
Expansion Module separated
Upper Locking Screw
Lower Locking Screw