Nortel Meridian 1 Manual page 509

8-66 Meridian 1 option 21 upgrades
Table 8-7
Database conversion requirements, option 21/21E to an option 51C
X11
release
ROM card
required
From To
For converting a release 18 customer database
(Use conversion procedure beginning on page 8-67)
18 19 N/A
19 21 N/A
For converting a release 19 or 20 customer database
(Proceed with "Installing option 51C hardware" on page 8-69)
19,20 21 N/A
Note: Use the latest software release (e.g., 21.xx) acquired from your Northern Telecom representative. If a
specific issue is indicated (e.g., 20.53 and 20.57), it must be used.
553-3001-250 Standard 14.00 August 1996
Software required (see note)
Release 19.xx 21E system software disk and data cartridge
Software Installation Tool
Software Installation Tool