ADTRAN 25 manual Add Circuit Pack

APPENDIX C: System Additions or Changes

Table C-A. Unit Loads

Port Type	I	Unit Load	Port Type	Unit Load
ZTN178 port	I	0.5	10- and 34-Button	1.25
			Terminals
TN742, TN746		1.0	HFAI Terminals	1.5
port
ETU		2.0	MET Terminals	1.0
TN760B Port		2.0	BIS Terminals	1.5
TN753B Port		0.5	34-Button Deluxe	2.0
			Terminals
502-type Headset		.75	S102A	1.0
Adapter			Speakerphone
5-Button		1.0	34-Button BIS	2.0
Terminals			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.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.

2.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.

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 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-2 November 1995