Comtech EF Data CIM-550, Installation And Operation Manual

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CiM-550 IP Enabled Satellite Modem Rev. 2
CiM IP Module Checkout & Fault Isolation CD/CIM550.IOM
426
3) Continue sending constant ping from the PC 1 to
PC 2. In the CiM 2, go to Operations
Maintenance/Diagnostics. Enable ‘Dump Packets
received from Satellite Interface”. Verify that the Pings
are being received by observing 1 packet on CLI every
second. If not displayed;
a) Reverify PC 2 and CiM 2 settings.
b) Verify IF link between modems for proper
settings and carrier quality (RX signal leval,
Eb/No, etc). It is possible that there is a
spectrum inversion, particulary if you are using
the CiM-550L with RF converter equipment. If
this is the case, the signal level & Eb/No may
be OK, but no data will be received. To correct
this invert the TX and RX Spectrum on one of
the CiM-550L’s.
NOTE: All pings transmitted will require a reply to be
transmitted from the target host. Use the Diagnostics
‘Dump Packets” tools to isolate where packets are lost
in the CiM duplex paths. Also, always disable “Dump
Packets” before sending live traffic.