Collision Recovery; Burst Mode System - Specifications; Loopback Modes - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Burst Mode Modulator Operation
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.
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C.5.1.1 Test Modes
The following receive IF test modes are available to the operator.
Test Modes
IF loopback:
RF loopback:
Baseband: Near end and far end
Interface: Near end
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.
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.
Remarks
C–11
Revision 1
MN/SNM1001L.OM