AT&T System 25 - Manual (Page 315)

APPENDIX D:
APPENDIX D:
System Upgrades
A D-kit-of-parts (PEC 62526N) k required to upgrade a Release 1 or a Release 2
system to a Release 3 V3 system. The kit contains the following:
●
ZTN142 CPU/Memory Circuit Pack(1)
●
ZTN131 Service Circuit Pack (1)
●
Switched Loop Attendant Console (SLAC) Face Plates (2)
●
Cassette Tapes (2)
● Release 3 V3 Documentation.
To upgrade to a Release 3 V3 system, proceed as follows:
1.
2.
3.
4.
5.
6.
7.
Connect SAT and DTU. Follow the instructions in this manual.
Save the translations, and verify the accuracy of the backup tape. Refer
to “Using the DTU” in Section 4.
Power down the system-all cabinets (Cabinet 1 last).
From R1 to R3 only: At the rear of the control cabinet (Cabinet 1), move
the 50-pin Amphenol connector from slot 2 to slot 1.
Remove the front cover on the control cabinet (Cabinet 1).
From RI to R3 only: Disconnect and remove the ribbon cable that
connects the Memory (ZTN81 or ZTN127) and Call Processor (ZTN82 or
Z T N 1 2 8 ) C P s .
Replace the ZTN81, ZTN127 Memory CP, or ZTN129 CPU/Memory CP
in slot 1 with the ZTN130/ZTN142 CPU/Memory CP.
November 1995 D-1