AT&T 518-600-016 manual Upgrading an Existing System

2Remove Processor Module 517A7 from S1Ot of the Basic Carrier. See “Removing a Module” on page 2-64 for instructions.

3Insert Feature Module 3 in the Release 3 Processor Module (517B7). See “Installing the Feature Module on the Processor Module” on page 2-73 for instructions.

4If needed, modify the Processor Module for square, or key, operation. See “Modifying the 51737 Processor Module for Square (Key) Operation” on page 2-78 for instructions.

5Insert the Release 3 Processor Module in slot 0 of the Basic Carrier. See “Installing a Module” on page 2-63 for instructions.

6Add line or station modules as needed. See “Installing Line and Station Modules” on page 2-79 and/or see “lnstalling a Basic Telephone Module” on page 2-81 for instructions.

7If an Expansion Carrier has been added, insert the Power Supply Module on that carrier in its slot. See “Installing the Power Supply Module” on page 2-66 for instructions.

8Consider unit load requirements to determine if any Auxiliary Power Units are needed. See “Determining Unit Load Requirements” on page 2-57 for information about unit loads and their calculation.

9Add Tie Line Modules as needed. See "Installing a Tie Line Module” on page 2-81 for instructions.

10Connect any new CO lines as follows as appropriate:

>Connect new CO lines from the network interface to the jack field if one has been used. Connect the CO lines from the jack field to the proper jacks on the line modules.

2-I 34 Upgrading an Existing System