Troubleshooting
9-8
InterReach Unison Installation, Operation, and Reference Manual
CONFIDENTIAL
D-620003-0-20 Rev J
{MF39} Port 3 UL RF path loss is too high
The uplink RF loss is above the recommended minimum. If codes MS13-MS16
are also present, the fiber is the most likely problem. Clean the fiber ports and
connectors. Ensure that the fiber connector is correctly seated.
If codes MS13-MS16 are not present, disconnect both downlink and uplink
fiber at the Main Hub. Wait 10 seconds, then re-connect downlink and uplink
fiber.
If fault common to more than one port, replace the MH. If only one port has the
fault, try another MH port. If no fault is reported, flag the previous port as unus-
able and replace the MH when possible. Otherwise, replace the EH.
{MF40} Port 4 UL RF path loss is too high
The uplink RF loss is above the recommended minimum. If codes MS13-MS16
are also present, the fiber is the most likely problem. Clean the fiber ports and
connectors. Ensure that the fiber connector is correctly seated.
If codes MS13-MS16 are not present, disconnect both downlink and uplink
fiber at the Main Hub. Wait 10 seconds, then re-connect downlink and uplink
fiber.
If fault common to more than one port, replace the MH. If only one port has the
fault, try another MH port. If no fault is reported, flag the previous port as unus-
able and replace the MH when possible. Otherwise, replace the EH.
{MF41}No communication with EH 1
If fault common to more than one port, replace the MH. If only one port has the
fault, try another MH port. If no fault is reported, the MH fiber port is dirty or
bad. Clean DL & UL fiber ports on both the MH and EH. Measure DL & UL
optical loss. Check for flat polished fiber connectors. Replace the EH.
{MF42}No communication with EH 2
If fault common to more than one port, replace the MH. If only one port has the
fault, try another MH port. If no fault is reported, the MH fiber port is dirty or
bad. Clean DL & UL fiber ports on both the MH and EH. Measure DL & UL
optical loss. Check for flat polished fiber connectors. Replace the EH.
{MF43}No communication with EH 3
If fault common to more than one port, replace the MH. If only one port has the
fault, try another MH port. If no fault is reported, the MH fiber port is dirty or
bad. Clean DL & UL fiber ports on both the MH and EH. Measure DL & UL
optical loss. Check for flat polished fiber connectors. Replace the EH.
{MF44}No communication with EH 4
If fault common to more than one port, replace the MH. If only one port has the
fault, try another MH port. If no fault is reported, the MH fiber port is dirty or
bad. Clean DL & UL fiber ports on both the MH and EH. Measure DL & UL
optical loss. Check for flat polished fiber connectors. Replace the EH.
{MF45}EH 1 disconnected
Try another port. If no connection, cycle EH power and confirm UL STATUS
LED is green for 90 seconds. Check UL fiber connection(s). Clean fiber con-
nectors and ports on MH and EH. Measure UL optical loss. Use “Clear All Dis-
connect Status” command to clear fault, or physically connect the EH.
{MF46}EH 2 disconnected
Try another port. If no connection, cycle EH power and confirm UL STATUS
LED is green for 90 seconds. Check UL fiber connection(s). Clean fiber con-
nectors and ports on MH and EH. Measure UL optical loss. Use “Clear All Dis-
connect Status” command to clear fault, or physically connect the EH.
Table 9-1
Faults Reported by the Main Hub (continued)
