AT&T MERLIN 410 Administration Manual page 6

9. Line and Voice Terminal Modules (Model 820 only)
These modules contain jacks for telephone company lines and jacks for voice
terminals. Three types are available: 2 lines/5 voice terminals, 0 lines/5 voice
terminals, and 2 lines/0 voice terminals. You can have as many as four modules for a
maximum of eight lines and twenty phones. The drawing of the control unit on page
6 shows a system with two modules installed.
10. Voice Terminal Jacks
The MERLIN system voice terminals plug in here. The number of the jack is the
same as the intercom number of the phone.
11. Telephone Company Line Jacks
Your lines from the telephone company plug in here. The letters next to the jacks–
A,B,C,D,E,F,G,H—correspond to the line buttons on voice terminals. (See "Initial
Feature Assignments," page 19.)
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MERLIN COMMUNICATIONS SYSTEM CONTROL UNIT
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MODEL 410
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