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BASIC BOARD MODULE (BBM)
7-5
c. Adjust R90 for -12 dBm ±0.5 dB at TP9.
d. Adjust R86 for -12 dBm
±0.5 dB at TP4.
e. Verify the level at J12 to be -21 dBm
±1 dB.
6. Normal Operation
a. Set S5 to 0 (normal operation). Close section 1, 2,
3 and 4.
b. Reset the module, Press S2 and release.
c. Remove the input alignment tone from J1.
7.4 TEST TASKS
The following are the eight available tests with
the Test Switch S5 and the functions the module
performs. These tests can be used for additional veri-
fication of a module and the system.
7.4.1 SYSTEM SWITCH EQUALS "1"
1. Connects the System Alignment Tone on the VTM
Bus to the Transmit Audio.
2. Close the telephone line relays to connect to the tele-
phone line.
7.4.2 SYSTEM SWITCH EQUALS "2"
1. Turns on the TXDTMF gate.
2. Programs the tone remote personality card for 2175
Hz at maximum level.
3. Turns on the tone to the main transmit line.
7.4.3 SYSTEM SWITCH EQUALS "3"
1. Turns on the TXDTMF gate.
2. Programs the tone remote personality card for
DTMF.
3. Sends the tone out the main transmit.
7.4.4 SYSTEM SWITCH EQUALS "4"
1. Sends an FSK message out the main transmit.
2. Receives the message on the main receive.
3. Sends a digital message out the secondary transmit.
4. Receives the message on the secondary receive.
5. Closes the M-lead and receives the E-lead input.
6. If display shows:
a. "A" - all three tests passed.
b. "1" - main test failed.
c. "2" - secondary test failed.
d. "3" - M-lead/E-lead test failed.
7.4.5 SYSTEM SWITCH EQUALS "5"
1. Sends an FSK message on both the main and
secondary transmit PCMs in Slot 31.
2. Receives a message on both the main and secondary
receive PCMs in Slot 0.
3. If display shows:
a. "A" - both receive messages passed.
b. "1" - main receive message failed.
c. "2" - secondary receive message failed.
7.4.6 SYSTEM SWITCH EQUALS "6"
1. Sends an FSK message on both the main and
secondary transmit PCMs in Slot 0.
2. Receives a message on both the main and secondary
receive PCMs in Slot 31.