Comtech EF Data CDM-570 - Manual (Page 435)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Appendix F MN/CDM570L.IOM
F–9
Scenario Problem Action
2 No Ping response from the
locally connected PC to the
remote CDM-IP or remote
PC.
ICMP response is ‘Request
timed out’.
a)
Verify both CDM-IP’s are in Managed Switch Mode.
b)
Verify IF link between modems for proper settings and carrier
quality (RX signal level, E
b
/N
0
, etc.). It is possible that there is a
spectrum inversion, particularly if you are using the CDM-IP with
RF converter equipment. If this is the case, the signal level &
E
b
/N
0
may be OK, but no data will be received. To correct this,
invert the TX and RX Spectrum on one of the CDM-IPs.
c) Send a constant ping from the PC 1 ‘ping 172.16.10.2 –t’ to PC
2. In the CDM-IP1, go to Operations and Maintenance/
Diagnostics. Enable ‘Dump Packets transmitted to Satellite
Interface’. Verify that the Pings are being transmitted by
observing 1 packet on CLI every second. If not displayed, re-
verify PC 1 and CDM-IP 1 settings. Disable ‘Dump Packets
transmitted to Satellite Interface’ by entering ‘T’.
d) Continue sending constant ping from the PC 1 to PC 2. In the
CDM-IP 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, re-verify PC 2 and CDM-IP 2 settings.
Disable ‘Dump Packets received from Satellite Interface’ by
entering ‘R’.
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 CDM-IP duplex paths. Also, always disable
‘Dump Packets’ before sending live traffic.