Add Circuit Pack - AT&T Network Adapter 25 Installation And Maintenance Manual

APPENDIX C: System Additions or Changes
I
Port Type
ZTN178 port
I
TN742, TN746
port
ETU
TN760B Port
TN753B Port
502-type Headset
Adapter
5-Button
Terminals

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. 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
2.
hr the type signaling. See Set TN760B Option Switches in this appendix.
3. Remove the front cover of the cabinet.
4. 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
Caution: To release static electricity, always wear a wrist
C-2
Table C-A. Unit Loads
Unit Load
0.5 10- and 34-Button
Terminals
1.0
HFAI Terminals
2.0
MET Terminals
BIS Terminals
2.0
0.5 34-Button Deluxe
Terminals
.75 S102A
Speakerphone
34-Button BIS
1.0
With Display
the cabinet where high voltage is present.
grounding strap when handling CPs. Electrostatic
discharge can destroy or severely damage integrated
circuits and CPs.
Port Type
Unit Load
November 1995
1.25
1.5
1.0
1.5
2.0
1.0
2.0