Comtech EF Data CDM-570A - Manual (Page 123)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Front Panel Operation Revision 2
6–19
Use the ◄ ► arrow keys to select the RTI Timeout value (in seconds) as 10s, 7s, 4s, 2s, or 1s.
Press ENTER.
CAUTION – USE THE Rx-Tx INHIBIT FEATURE WITH EXTREME
CARE!
RTI means RECEIVE/TRANSMIT INHIBIT. When you select this feature, the
modem prevents transmission of the Tx carrier until the demodulator is locked.
To prevent the Tx Carrier from turning off when the demodulator loses lock for
a very short period of time, you must instruct the demodulator to unlock
continuously for a selected time period (10, 7, 4, 2, or 1 seconds) before the
mode inhibits the transmit carrier.
Enabling the RTI feature does not affect the internal IF loopback feature. Be
aware, however, that if you attempt an external IF loopback (by connecting an
external cable from the Tx IF output to the Rx IF input), then this will not work!
The Tx carrier cannot turn on until the demod locks, and the demod cannot lock
because the Tx output is off. The net result is that the demod will not lock and the
Tx carrier will not turn on.
6.3.2.3.7 (CONFIG: Tx) Pwr (Power)
Output Power Level Mode:
Manual AUPC CnC-APC
Use the ◄ ► arrow keys to set the output power level mode. Press ENTER.
(CONFIG: Tx) Output Power Level Mode: Manual
Tx Output Power Level:
-03.9 dBm (◄ ►,▲ ▼ ENT)
To edit the Tx Output Power Level, use the ◄ ► arrow keys to select a digit, and then use the
▲▼arrow keys to change that digit. Press ENTER. Note the following:
• For the CDM-570AL, the valid range of output power is from 0 dBm to –40 dBm.
• For the CDM-570A, the valid range of output power is from 0 dBm to –25 dBm.
(CONFIG: Tx) Output Power Level Mode: AUPC
Appendix E. AUPC (AUTOMATIC UPLINK POWER CONTROL)
• If you do not select ‘Framed’ or ‘IP-ACM’ mode, and you then attempt to select AUPC,
the modem displays the following message: