Quantum and Evolution Series Installation and Operating Handbook
11-3
Alarms and AGC Connector
Connector type: 15-pin `D' male
ALARMS CONNECTOR
2, 12
Fault Relay - Common
4
Prompt Unit fault - N/O
11
Prompt Unit fault - N/C
3
Prompt Rx Traffic fault (prompt) - N/O
10
Prompt Rx Traffic fault (prompt) - N/C
5
Prompt Tx Traffic fault (prompt) - N/O
13
Prompt Tx Traffic fault (prompt) - N/C
1
Deferred alarm - N/O
9
Deferred alarm - N/C
6
Uncommitted analog output from processor – not currently used
7 Transmit
inhibit
8
Buffered direct AGC voltage. This may be used as an antenna-
pointing signal when the demod is unlocked. It responds to
composite power in approximately a 2MHz bandwidth around the
nominal Rx carrier frequency.
14 Not
connected
15 Ground
To externally inhibit the Transmit carrier, either apply a TTL/CMOS 'low' signal to pin 7, or
short pin 7 to ground (for example with an external relay closure).
All relay contacts rated 30V DC 2A, or 125VAC 0.4A. The functions are as defined in
Section 6.5.
Note: N/O means 'normally open'
in the non-fail state of the modem
(relays energised)
when power is removed the relays fall back to the non-normal (ie non-energised) alarm
state.
