Nortel Meridian 1 Planning, Installation And Operating Instructions page 335

Page 316 of 536
553-3121-210 Standard 3.0
Chapter 22 — Upgrading software
Procedure 72
Reverting to Previous Software Procedure
1 If not previously done, install the Software Delivery (PCMCIA) card in
the socket in the faceplate of the SSC Card.
Note: This Software Delivery card must be the same one that was
used to upgrade this Option 11C Compact. It must not have been used
to upgrade a subsequent Option 11C Compact because the Security
ID will no longer match and the "undo" function will fail.
To install the Software Delivery card:
• Insert the card in slot A in the PCMCIA socket located in the
faceplate of the NTMW01 Small System Controller (SSC) card.
Gently press on the Software Delivery card until it is firmly
seated.
2 Select the method of invoking the Software Installation Program.
There are two methods of invoking the Software Installation Program:
• By using the UPGRADE command in Overlay 143 (this is the
recommended method — no SYSLOAD).
—or—
• By pressing the 'control' and 'I' keys on the keyboard when
prompted after the Software Delivery card is installed (this
method requires a SYSLOAD).
If you wish to invoke the program using Overlay 143
go to Step 4
If you wish to wish to invoke the program when prompted
go to Step 5
January 1999