
UPGRADE PROCESS SYSTEM 75
UPGRADE PROCESS SYSTEM 75
This section provides the information necessary to upgrade the System 75
from a Release 1, Version 1 (R1V1 ) system to a Version 2 (R1V2) or Version
3 (R1V3) system. The hardware and software involved in the upgrades and
the upgrade procedures are also provided.
The upgrade is required when the customer has a need for increased call
processing, enhanced feature capabilities in voice and data networks, system
management, and traffic management.
UPGRADE VERSION 1 TO VERSION 2
The following processes are required for a Version 1 to Version 2 upgrade:
• Hardware upgrades that involve modifying, replacing, and adding
circuit packs.
• Replacing the software tape.
• Software upgrades that involve saving, loading, and reentering
system translations.
• Reentering translations from Version 1 features and entering Version
2 system and voice terminal features. Most of the system and voice
terminal features are assigned by the customer’s System Manager.
System 75 features and functions are listed in the AT&T System 75--Feature
Description, 555-200-201. The AT&T System 75—implementation—Release 1,
Version 2, 555-200-651, provides the procedures and forms required to
implement the Version 2 features. The AT&T System 75—Administration, 555-
200-500, provides the commands and procedures required to initialize and
administer the System 75.
1. Hardware Upgrades
Only three circuit packs are required for the basic R1V2 system upgrades.
The other seven will be provided on an optional basis for R1 V2 features, as
required by the customer.
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