10/6/10 888-2629-200 4-17
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Maxiva ULX COFDM Series
Table 4-6 Exciter A Control/Status Connector J1A on TCU (9 pin female dsub)
Pin Signal Description
1 /EXC_A_MUTE_CMD Open collector output- Exciter A mute
command-100mA sink capability @ 0.8Vdc max.
1K ohm pull up to +5V. TVS protection.
Active’0’ state to command exciter mute.
2 /EXC_A_EQUALIZER_HOLD_CMD Open collector output- Exciter A equalizer hold
command-100mA sink capability @ 0.8Vdc max.
1K ohm pull up to +5V. TVS protection.
Active’0’ state to command exciter equalizer to
hold.
3 /EXC_A_ACTIVE_CMD Open collector output- Exciter A active
command-100mA sink capability @ 0.8Vdc max.
1K ohm pull up to +5V. TVS protection.
Active’0’ state to command exciter equalizer to
"on air".
4 NC No connection
5 GND Ground
6 GND Ground
7 /EXC_A_MUTE_STATUS CMOS input-Exciter A mute status-’0’ on this
line indicates exciter is muted. TVS protection.
1K pull up to +5Vdc
8 /EXC_A_RF_PRESENCE_STATUS CMOS input-Exciter A RF presence status-’0’ on
this line indicates exciter is present. TVS
protection. 1K pull up to +5Vdc.
9 /SUMMARY_FAULT CMOS input-Exciter A summary fault-’0’ on this
line indicates exciter has a fault. TVS protection.
1K pull up to +5Vdc.
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