Troubleshooting
9-20
InterReach Unison Installation, Operation, and Reference Manual
CONFIDENTIAL
D-620003-0-20 Rev J
Expansion Hub Warnings
Table 9-5
Warnings Reported by the Expansion Hub
Warning Message
Action
{EW21}The DL RF path has excessive gain
If the warning is common to more than one EH, replace the MH. If only one EH
has the warning, try another MH port. If no warning is reported, flag the previ-
ous port as unusable and replace the MH when possible. Otherwise, replace the
EH when possible.
{EW22}The DL RF path loss is too high
Downlink RF loss is above the recommended minimum. If ES01 is also
present, the fiber is the most likely problem. Clean the fiber ports and connec-
tors. Ensure the fiber is correctly seated.
If ES01 is not present, disconnect both downlink and uplink fiber at the Main
Hub. Wait 10 seconds, then re-connect downlink and uplink fiber.
Check the DL cable for excessive optical loss. If the warning is common to
more than one EH, replace the MH when possible. If only one EH has the warn-
ing, try another port on the MH. If no warning is reported, flag the previous
port as unusable and replace the MH when possible. Otherwise, replace the EH
when possible
{EW23}Hardware problem. Possible
degraded performance
Replace the EH when possible.
{EW24}Hardware problem. Possible
degraded performance
Replace the EH when possible.
{EW33}Contact closure 1 warning active
Contact closure 1 indicates an active warning. AC may have failed.
{EW34}Contact closure 2 warning active
Contact closure 2 indicates an active warning. UPS battery may be low.
{EW35}Contact closure 3 warning active
Contact closure 3 indicates an active warning.
Note: * applies to Firmware version 5.1 or earlier
