Merlin 3070 Service And Maintenance Manual page 12

SERVICES MODULE TYPE B (OPTIONAL)
The Services Module (Type B), an optional module color-coded yellow, occupies position 6.
When a Type B module is not used, a plastic cover protects position 6. The Services Module
provides connections for auxiliary equipment: single- and multizone paging systems, music
sources, extra alerts, and Power Failure Transfer Telephones.
PFTT jack: Provides connection for up to
four backup basic Touch-Tone or rotary
telephones (Power Failure Transfer
Telephones). Service will automatically
switch over to these telephones if power to
the control unit is interrupted. When
power is restored, service will automatically
switch back to the control unit. A single
telephone plugged into the module
connects with line A0. When connected
through a 4-Way Modjack Adapter, four
phones will access lines A0, A1, B0, and
B1. (See Line Module description, page
12, for information on line designations.)
Extra Alert jacks: Provide connections for
three separately controllable extra alerts
(horns, bells, chimes, strobes, etc.).
Page jack: Provides connections for a
single- or multizone paging system.
Music In jack: Provides a music source
connection for Music-on-Hold and
Background Music features.
MOH Vol screw: Controls the volume for
Music-on-Hold.
Bkgd Vol screw: Controls the volume for
Background Music.
Tone switch: Turns paging signal on and
off (1 = on, 0 = off).
Level switch: Sets impedance level for
music source.
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CIB 3016