Comtech EF Data SNM-1001L - Manual (Page 191)

8–1
Chapter 8. SYSTEM CHECKOUT
8.1 System Checkout
CAUTION
This equipment contains parts and assemblies sensitive to damage by ESD.
Use ESD precautionary procedures when touching, removing, or inserting
PCBs.
The modem comes equipped with an internal self-test feature. This feature is designed to
provide the operator with maximum confidence that the modem is operational without
installing external equipment.
A 2047 pattern is generated by the modem and routed through all sections. Placing the
modem in IF and baseband loopbacks accomplish this. Pseudo Gaussian noise is
introduced to the modulated IF section allowing the modem to check its indicated E
b
/N
0
against the known E
b
/N
0
of the demodulated input.
• If this measurement falls
outside of a specified
window:
The modem declares a failed test.
• If Reed-Solomon card(s)
are installed:
The signal is routed through the TX or
RX card, verifying their operation.
• Faults, if any: Stored in the Stored Fault menu.