Cisco Optical Hub and Hub-Node Installation Guide
Chapter 5 Troubleshooting
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OL-29937-01
Note: The SM could receive messages not intended for it. In this case, the SM
discards the messages and stays in this state.
discards the messages and stays in this state.
This state indicates that the headend controller is not receiving data and is not
registering the SM. The most common cause of this problem is that the reverse plant
levels are incorrect.
registering the SM. The most common cause of this problem is that the reverse plant
levels are incorrect.
Complete the following steps to troubleshoot this condition.
1 Verify that the MAC address and/or IP address of the SM is correctly recorded
1 Verify that the MAC address and/or IP address of the SM is correctly recorded
on the headend controller.
2 Verify the SM is transmitting on the reverse frequency by using a spectrum
analyzer to check the transmitter test point for a reverse carrier on the correct
frequency.
Note: This is a short burst and it may be necessary to use the "Max Hold"
function of the spectrum analyzer.
frequency.
Note: This is a short burst and it may be necessary to use the "Max Hold"
function of the spectrum analyzer.
3 If the reverse carrier is present, check the cabling at the headend controller. Since
the Status Monitor is receiving the channel descriptor but not receiving
registration commands, the downstream and upstream cables may not be
connected properly.
registration commands, the downstream and upstream cables may not be
connected properly.
4 After verifying the SM is transmitting a carrier on the reverse plant, verify that
the carrier is present at the headend controller and that the levels are correct.
Note: An HMS compliant headend controller has a -20 dBmV to +20 dBmV input
range. Some non-HMS headend controllers have a very limited input range,
therefore the reverse plant and transponder's transmit power level may need to
be tuned to accommodate them.
Note: An HMS compliant headend controller has a -20 dBmV to +20 dBmV input
range. Some non-HMS headend controllers have a very limited input range,
therefore the reverse plant and transponder's transmit power level may need to
be tuned to accommodate them.
Registered State
If the SM is in the "Registered" state, then it is communicating successfully with the
headend controller.
headend controller.
Notes:
In some cases, the SM may be communicating MIB data with the headend
controller but not showing "Registered" on the HPT status screen. The full
registration can take up to one hour when registering with certain Non-HMS
headend controllers.
controller but not showing "Registered" on the HPT status screen. The full
registration can take up to one hour when registering with certain Non-HMS
headend controllers.
If the SM is in the "Registered" state, but MIB data is not being transferred, then
the EMS software is not configured correctly.
the EMS software is not configured correctly.