The Control Unit - AT&T MERLIN 410 Administration Manual

The Control Unit

The control unit is the center of the MERLIN system in that, one way or another,
everything connects to it.
Feature Package 2, which contains the software that enables you to customize your
MERLIN system, is a cartridge that plugs into your control unit. It can be used with
the control unit for Models 206,410, or 820. These models differ from one another in
the number of outside lines and voice terminals (MERLIN system telephones) that
they support.
The diagrams on the next two pages show the parts of your control unit. The diagram
of the Model 410 control unit serves to illustrate both Model 410 and Model 206.
1. Red Warning Light
The red Iight warns you about problems in the system. (See "Troubleshooting Chart,"
pages 36-37.)
2. Green Power Light
The green light indicates that power is on.
3. Admin/Normal Switch
When you administer the system, set this switch to Admin. You can leave it in the
Admin position permanently, even during normal operation, if you wish. However, to
ensure that no accidental administration takes place, you may want to set it back to
Normal (see page 17).
4. ToII Prefix/Area Code Switch
If you use a 1 or 0 as a prefix when dialing long-distance calls, set this switch to Toll
Prefix. If you do not use a prefix, set the switch to Area Code (see page 16).
5. Tone/Pulse Switch
If you have Touch-Tone service, set this switch to Tone. If you have rotary pulse lines
from your telephone company, set it to Pulse.
6. Auxiliary Power
The Auxiliary Power Unit plugs in here to provide the auxiliary power you need if you
have an unusual number of accessories, for example, Hands-Free Units or 34-but-
ton deluxe voice terminals.
7. On/Off Switch (Model 820 only)
Controls electrical power to the MERLIN system.
8. AC Power Input (Model 820 only)
The electrical power cord plugs in here.
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