NEC Xen Topaz System Hardware Manual page 23

Xen Topaz System Hardware Manual
7.2 12TD TEL
This hybrid Multiline Terminal has 12 Line Keys (with 2-colour LEDs),
10 Programmable Function Keys (no LED indication), intercom
talkback function, and a large LED to indicate incoming calls and
messages. It also incorporates height adjustment, built-in wall mount
facility. It is available in black.
A maximum of 24 12TD terminals can be installed in the Xen Topaz
system. The combined total of all terminals that can be installed is 24.
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The Components