Comtech EF Data SNM-1001L - Manual (Page 325)

SNM-1001L Satellite Modem Revision 1
Burst Mode Modulator Operation MN/SNM1001L.OM
C–11
C.4.15 Collision Recovery
A programmable packet length can be programmed from 48 bps to 1,048,576 bps in 1 bit
increments. This allows for the demodulator to go back to acquisition mode when this
parameter times out, in the case of a collision. This value should be set greater than the
maximum packet size but less than the time slot size.
Note: this is programmed from the UTILITY DEMODULATOR menu.
C.5 Burst Mode System - Specifications
C.5.1 Loopback Modes
The operator can select one of the following interface loopback test modes.
• Baseband: Near end and far end
• Interface: Near end
C.5.1.1 Test Modes
The following receive IF test modes are available to the operator.
Test Modes Remarks
IF loopback: Disconnects the IF input from the receive input connector and couples it to a sample
of the transmit IF output. The IF output is not affected.
Note: The transmit and receive data rates must be the same for the modem to lock.
RF loopback: Sets the demodulator frequency to the same value as the modulator. For the
modem to lock, an external IF loop must be provided.
Note: The transmit and receive data rates must be the same for the modem to lock.