Merlin 3070 Service And Maintenance Manual page 6

BASIC CONFIGURATION
A. Control unit: The control unit is
the heart of the MERLIN system.
It provides the power and
intelligence for all voice terminals
as well as the connection
between voice terminals and
outside lines. Program memory
for the MERLIN system resides
in the control unit.
Model 1030 is the basic control
unit (the lower half of the unit
illustrated) and has a capacity of
10 lines and 30 voice terminals or
telephones. Model 3070, with the
expansion unit mounted above
the basic control unit as
illustrated, has a capacity of 30
lines and 70 voice terminals or
telephones.
B. Network interface: The network
interface connects the control unit
and the outside lines. The most
common network interface is the
25-pair amphenol connector
(RJ21) illustrated. However, the
network interface may be
different (see the Installation
Guide: Models 1030 and 3070).
C. Jack field: The jack field connects the control unit and modular jacks for the voice
terminals. Optional attachments (extra alerts, paging systems, etc.) may also connect to
the control unit through the jack field.
D. Modular jack: Each voice terminal wiring run from the jack field terminates in a modular
jack. Every voice terminal has a separate modular jack.
E. Voice terminal: The voice terminal provides not only basic telephone functions, but also
access, usually by programmable buttons, to the advanced feature software residing in
the control unit. Basic Touch-Tone and rotary-dial telephones may also be used with the
MERLIN system. These telephones access system features by means of dial codes.
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