Comtech EF Data C5 - Manual (Page 81)

C5/K1/K3 Integrated Satellite Terminal System Specifications
Rev. 0 2–47
2.6 System Specifications
2.6.1 Test Modes
Refer to Table 2-27 for available test modes.
Table 2-27. Test Modes
Test Mode Description
RF Loopback Tunes the RX frequency to the satellite downlink frequency for the
configured TX frequency. A C-Band system will tune the RX frequency
2.225 GHz below the TX frequency. A Ku-Band system will tune the RX
frequency 2.3 GHz below the TX frequency.
Note: The TX and RX data rates must be the same for the modem to lock.
IF Loopback Tunes the RX IF to a sample of the TX IF output. The IF out is not
affected.
Notes:
1. The TX and RX data rates must be the same for the modem to
lock.
2. Since the TX IF output is active, RF OFF must be selected if
transmission is not intended.
BIST (Built in
Self Test) The IDU has the ability to generate 2 11 -1 (2047) PN data and pass the
data through the interface, modulator, and demodulator sections of the
IDU. The IDU generates noise in the IF path to simulate a satellite
environment. This feature invokes on power up or by the operator and the
result checked against specification (and a fault is flagged if the unit
fails). This feature can be turned off at the front panel (if desired) to
minimize initialization time.
RS CORR Off Turns off the Reed-Solomon decoder data error correction circuitry. Data
flow is then routed through the normal data paths without error
correction.
Note: Available with Reed-Solomon Interface only.
Baseband
Loopback Internally switches the modulator clock and data signals to the
demodulator. Also, loops the external DTE TX clock and data to the
external receiver.
2047 Pattern
Generator Inserts an industry standard 2047 pattern in place of the TX data stream.
Note: Available with Overhead card installed.
Interface
Loopback Internally switches the modulator clock and data (with overhead data)
signals to the demodulator. Also, loops the external DTE TX clock and
data to the external DTE receiver.
Note: Available with Overhead or Reed-Solomon option installed.
2047 Pattern
Monitor Monitors the RX data for 2047 pattern. If 2047 pattern is present; this test
mode provides an indication of Bit Error Rate (BER). The RX data is not
interrupted.
Note: Available with Overhead card installed.
ODU Enable Disables ODU faults and alarms.