NEC Xen Topaz System Hardware Manual page 25

Xen Topaz System Hardware Manual
7.4 6TD TEL
This hybrid Multiline Terminal has 6 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 6TD 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