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...

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...

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,...

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...

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...

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...

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...

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...