The Sapphire was Mercury compatible 1 + 5 PABX. It could be expanded to a 2 + 8 by adding a 1 + 3 clip in module.
An FT terminal could also be fitted to this system.
A console must be fitted to the system, as it is impossible to program the system
without it. It also has key & lamp indication of line and extension
status. On a 1+5 system the console is extn 1, whilst on a 2+8 system it becomes
extn 21 (extensions are numbered 1 -5 or 21 - 28).
The console has buttons for Prime Extension, Volume, Do Not Disturb and Monitor
(on-hook dialling only - no full handsfree)
Last revised: November 28, 2010