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D9112 Operation & Installation Manual
Page 31
© 1993 Radionics
74-06144-000-C 2/96
Primary Phone Lines, Primary Phone Numbers
Don’t confuse primary phone lines with primary phone numbers:
With the D128
Dual Phone Line Switcher installed, the D9112 uses two phone lines, primary and
secondary, to dial up to four phone numbers.
These four phone numbers are designated as primary, backup, or duplicate. See
Phone
Routing
in the
Panel Wide Parameters
module of the
D9112 Program Entry Guide
(74-
06145-000) for a description of these designations.
The D128 uses the primary or secondary phone line to dial a primary, secondary, or
backup phone number. After two failed attempts to reach the receiver on the primary
phone line, the D9112 switches to the secondary line.
It alternates between the two phone lines, making two attempts on each line, until it
makes ten attempts on each line. After ten failed attempts on each phone line, the
D9112 goes into communication failure. See
Communication Failure
in this section.
Watchdog Feature
The D128 Watchdog circuit monitors the D9112’s CPU (Central Processing Unit) for
proper operation. If the CPU fails, the buzzer on the D128 sounds in addition to the
sounder on the D9112. The D128 only stops sounding when the D9112’s CPU begins
operating normally.
Installing the D128
1. Mount the D128 on the lower right side of the enclosure using the screws provided
with the switcher. See Figure 2.
2. Connect the green lead from the D128 to terminal 1 on the D9112.
3. Connect the black lead from the D128 to terminal 9 on the D9112.
4. Plug one end of the ribbon cable provided with the D128 into J4 on the D128. Plug
the other end into J2 (ACCESSORY) on the D9112.
5. Plug one end of the D162 (2') phone cord provided with the D128 into J3 on the
D128. Plug the other end into J3 (TELCO) on the D9112.
6. Plug one end of a D161 (8') or D162 (2') phone cord into J1 on the D128. Plug the
other end into the RJ31X for the primary phone line.
7. Plug one end of a D161 or D162 phone cord into J2 on the D128. Plug the other end
into the RJ31X for the secondary phone line.