ATT System 25 Installation And Maintenance Manual

							APPENDIX B: Parts Listing
DESCRIPTlON
Cables
Octopus Cable (15 ft)
Splitter Cable, Tie-Trk
Splitter Cable, CO Trk
Adapter (TN746)
RS-232C X-Over Cable
Cable Corm (15’ DE)
CPU/MEM
interconnect cable
Cable, Adapter
Cable, Connector
Cable, Connector
PEC
2720-OSP
2720-05X
2720-06X
2724-30C
No PEC
No PEC
No PEC
No PEC
No PEC
APPARATUS CODE
WP90780, L1
WP90929, L3
WP90929, L1
8536
M7U-87
A25D
853B
H600 307, G2
C6E
COMCODE
405010612
403864150
403836620
104305834
104246616
100963990
845412956
104305834
104307434
Cords
Mod(ADU) X-Over Cord2724-38X138AM-87104154430
Mod Cord (7 ft)2725-07G D8W-87103786786
Mod Cord (14 ft)2725-07ND8W-87103786802
Mod Cord (25 ft)2725-075D8W-87103786828
MET AdapterCord
2750-AI 7 ZD8AJ103881421
* Not Available.
B-1ONovember 1995 
						

							APPENDIX C:
APPENDIX C:
System Additions or Changes
Additions and changes can be made to the system to support growth or
changing needs of the customer.These system changes include: adding
voice or data terminals, changing a voice-only connection to a voice/data
connection, adding trunks, adding modems, and adding auxiliary equipment.
To handle such changes as these, you may need to add or replace circuit
packs (CPs), add a cabinet, add cabling, and add or change a user’s terminal.
These procedures are described first; then specific procedures for making
the changes listed above are described.
Note:After any changes have been made, save translations to
DTU.
Evaluate Cabinet Unit Power Load
Each cabinet can handle a maximum of 80 unit loads of 48-volt power. The
unit load for each type of terminal equipment is shown in Table C-A. Before
adding a CP or a terminal to an existing system, count the unit loads in the
cabinet to ensure that the maximum has not been reached.
Any station/adjunct combination requiring more than two unit loads must be
locally powered.When 7300H Series terminals are locally powered, they
represent zero load to the switch. (Any CPs not listed do not affect the unit
load.)
November 1995
C-1 
						

							APPENDIX C: System Additions or Changes
Table C-A. Unit Loads
Port TypeIUnit Load
ZTN178 port
I
0.5
TN742, TN7461.0
port
ETU2.0
TN760B Port2.0
TN753B Port0.5
502-type Headset.75
Adapter
5-Button
1.0
Terminals
Port Type
Unit Load
10- and 34-Button
1.25
Terminals
HFAI Terminals
1.5
MET Terminals
1.0
BIS Terminals
1.5
34-Button Deluxe2.0
Terminals
S102A
1.0
Speakerphone
34-Button BIS2.0
With Display
Add Circuit Pack
All CPs are installed in the cabinets in the same way. Evaluate the cabinet unit
power bad, using the procedure above.
1.
2.
3.
4.
Determine in which cabinet to add the CP. Install all DID CPs in
Cabinet 1. A maximum of two Pooled Modem CPs can be installed in
each cabinet. A maximum of two TN767 DS1 Interface CPs can be
Installed per system. Select the cabinet with the lowest unit load to
minimize the power bad and heat dissipation requirements.
It the CP being added is a TN760B, you must first set the option switches
hr the type signaling. See Set TN760B Option Switches in this appendix.
Remove the front cover of the cabinet.
See Danger and Warning. Make sure that your hands are clean and dry.
Put on a wrist grounding strap, and clip it to the grounding block at the
back of the cabinet.
Danger:Do not clip the wrist grounding strap to the front of
the cabinet where high voltage is present.
Caution:To release static electricity, always wear a wrist
grounding strap when handling CPs. Electrostatic
discharge can destroy or severely damage integrated
circuits and CPs.
C-2November 1995 
						

							APPENDIX C: System Additions or Changes
5. Insert the CP into the slot with the latch lever opened. Push it in firmly
until you feel resistance and the latch lever moves toward its vertical
position, flush with the edge of the CP. Push the lever all the vvay to
vertical until the latch pin engages. (See figure C-1.)
Add Cabling
If the CP added is a voice or data station CP (ZTN78, ZTN79, TN762, TN726,
TN735, TN742, or TN746), you must connect the associated 25-pair receptacle
in the back of the cabinet to the SIP with an octopus cable. Follow the
instructions under “Connect Cabinets to SIP in Section 2. If the new CP is a
trunk CP (ZTN76, ZTN77, TN747, TN760, TN763, or TN753), connect the
associated 25-pair receptacle on the back of the cabinet to the TAE with a
splitter cable, following the instructions under “Install Equipment Room Trunk
Cablingn in Section 2.
For DS1 Interface CP (TN767) connections, see “Install DS1” in “INSTALL
EQUIPMENT ROOM TRUNK CABLING” in Section 2.
November 1995
C-3 
						

							APPENDIX C: System Additions or Changes
Figure C-1.
Typical System 25 Port Circuit Pack
C-4
November 1995 
						

							APPENDIX C: System Additions or Changes
Set Option Switches on TN760B CP
If the CP being added is a TN760B, use Figure C-2 and Table C-B to choose
Figure C-2.
Tie Trunk (TN760B) Circuit Pack Option Switches
C-5 
						

							APPENDIX C: System Additions or Changes
Table C-B.TN760B Option Switch Settings and Administration
System 25
Installation
Situation
Circumstance
Co-Located
Inter-Bldg.
.
Co-Located
Inter-Bldg.
Co-Located
Inter-Bldg.
Co-Located
To
Sys25
DEFINITY
Sys75/75XE
Sys85
Sys25
DEFINITY
sys75/75xE
Sys85
DIMENSION
PBX
DIMENSION
PBX
Other
Other
Net
Int.
Preferred
Signaling Format
System 25
Simplex
Type 5
Simplex
Type 5
E&M
Type 1
Compatible
Prot.
Type 1
Compatible
E&M
Type 1
Compatible
Prot.
Type 1
Compatible
E&M
Type 1
Standard
Far-End
Simplex
Type 5
Simplex
Type 5
E&M
Type 1
Standard
Prot.
Type 1
Standard
E&M
Type 1
Standard
Prot.
Type 1
Std. 
PIUS
Protection
Unit
Don’t Care
Set
E&M/
SMPLX
Option
Switch
SMPLX
SMPLX
E&M
E&M
E&M
E&M
E&MSet
Prot/
Unprot
Option
Switch
Either
Either
Unprot
Prot
Unprot
Prot
UnprotAdminister
the Port
Type 5
Type 5
Type 1
Compatible
Type 1
Compatible
Type 1
Compatible
Type 1
Compatible
Type 1
C-6 
						

							APPENDIX C: System Additions or Changes
Replace Circuit Pack
Replace a CP if it fails or becomes damaged.
1.
2.
3.
4.
5.
6.
Make sure that your hands are clean and dry. Put on a wrist
grounding strap, and clip it to the grounding block at the back of the
cabinet.
With your thumb, pull up on the latch pin.
When the latch is up, pull down on the latch lever until the lever
stops at an angle of about 30 degrees to the floor.
Pull the CP out of the slot, and set it aside.
Insert the replacement of the same type CP in the same slot,
following the instructions above for adding a CP.
Package the defective CP in protective material, and return it per
local instructions.
C-7 
						

							APPENDIX C: System Additions or Changes
Add Cabinet
Add a cabinet if all the slots in the existing cabinets are full and you need to
add a CP. Also, if the addition of a CP to a cabinet will cause the unit load to
exceed 80, a cabinet must be added. The system can support a maximum of
three cabinets.
Perform this task outside normal business
interfering with normal business operations.
Caution:
1.
2.
3.
4.
5.
Make
StackService is interrupted whenhours, if possible, to avoid
the TDM Bus cable is
connected to working cabinets.
sure that the new cabinet power switch is in the OFF position.
the new cabinet on top of the existing cabinet(s).
Remove the front and upper back covers.
Label the connectors on the bottom back cover following the
instructions under “Install System Cabinets” in Section 2.
On the backplane near the center, note an “address plug” installed
in one of the positions marked 1-3 on a black address connector.
This indicates the cabinet number. If it is not in the correct position,
pull it out and insert it in the correct position. (The new cabinet will
be either Cabinet 2 or 3.) Take care to avoid bending the pins on the
backplane.
C-8 
						

							APPENDIX C: System Additions or Changes
6.
7.
8.
9.
10.
11.
12.
13.
14.
Power down the system
—all cabinets (Cabinet 1 last).
Connect the cabinets, following the instructions under “Install
System Cabinets” in Section 2.
Connect a #6 AWG copper wire between the ground block of the
new cabinet and the ground block of Cabinet 1.
See Note. Make connections between the TDM bus of the new
cabinet and the cabinet directly beneath. Move the bus terminator,
following the instructions under “Install System Cabinets” in Section
2.
Note:
When properly installed, the light blue stripe on the
extender cable is at the bottom of the cable and the
lettering on the cable (SER=1, for example) is right
side up.
Connect the receptacle end of the power cord to the plug at the rear
of the new cabinet.
Connect the plug end of the power cord to the system’s quad ac
outlet.
See DANGER. Recheck the electrical and ground connections that
you just made.
Danger: Once power has been applied,
hands or tools into the cabinet.
Power up the system—Cabinet 1 last.do not insert
Check the performance of the CPs in the new cabinet following the
instructions under “Power Up and Initialize System” in Section 2.
C-9