Cisco Model GS7000 4-Port Node 1 GHz with 42 54 Split Installation Guide
Chapter 4 Troubleshooting
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4015678 Rev B
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 the SM is transmitting on the reverse frequency by using a spectrum
1 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.
2 If the reverse carrier is present next 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.
3 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 +20dBmV 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 +20dBmV 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 management information base
(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.
(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.
If the SM is in the "Registered" state, but MIB data is not being transferred, then
the element management software is not configured correctly.
the element management software is not configured correctly.
Error State
If the SM is in the "Error" state, then the transponder core module in the SM is
defective. Replace the transponder core module or the entire SM as necessary.
defective. Replace the transponder core module or the entire SM as necessary.