Troubleshooting the Cisco Remote-PHY Solution

This section provides the troubleshooting procedures for the Cisco Remote-PHY solution.


Note

show cable cmc command can be used to identify the status of CMC in first hand. 

issu-ubr10k-5#show cable cmc
MAC Address    IP Address      State      Group Offset CMCID Conn ID    IF
9078.5634.1200 0.0.0.0         init(d)    0     0      1     N/A        Gi7/0/0

The table below shows the description of each state.

Table 1 CMC State Description

State

Description

Offline

CMC is not operational

Reject(i)

IP assign failed

Init(d)

DHCP discovery

Init(g)

GCP connection establishing

Init(est)

GCP connection established

Init(c)

Get CMC Capability

Init(s)

Download configuration to CMC

Reject(c)

Get CMC Capability failed

Online

CMC is operational

Troubleshooting the Cisco Remote-PHY Solution

This section provides the troubleshooting procedures for the Cisco Remote-PHY solution.


Note

show cable cmc command can be used to identify the status of CMC in first hand. 

issu-ubr10k-5#show cable cmc
MAC Address    IP Address      State      Group Offset CMCID Conn ID    IF
9078.5634.1200 0.0.0.0         init(d)    0     0      1     N/A        Gi7/0/0

The table below shows the description of each state.

Table 2 CMC State Description

State

Description

Offline

CMC is not operational

Reject(i)

IP assign failed

Init(d)

DHCP discovery

Init(g)

GCP connection establishing

Init(est)

GCP connection established

Init(c)

Get CMC Capability

Init(s)

Download configuration to CMC

Reject(c)

Get CMC Capability failed

Online

CMC is operational

Troubleshooting: Cisco uBR-MC3GX60V-RPHY Line Card Link LED Does Not Illuminate

Problem    After inserting the network cable into the SFP module of the Cisco uBR-MC3GX60V-RPHY line card, the LINK LED of the line card does not illuminate.
Possible Cause    Dirt or skin oil is accumulated on the network cable plug faceplate generating significant attenuation and reducing the optical power levels below threshold levels. This could result in link failure.
Solution    Clean the plug faceplate with a lint-free tissue soaked in 99 percent pure isopropyl alcohol and then with a dry lint-free tissue. Remove any residual dust from the faceplate with compressed air before installing the network cable.

Troubleshooting: Cisco CMC Resets After DHCP Timeout

Problem    The Cisco CMC is reset after DHCP timeout.
Possible Cause    The DHCP server address is not specified in the Gigabit Ethernet interface of the Cisco uBR-MC3GX60V-RPHY line card.
Solution    Verify the Gigabit Ethernet Interface configuration on the Cisco uBR-MC3GX60V-RPHY line card. To specify the DCHP server address, use the ip helper-address command. For more information, see Configuring the Gigabit Ethernet Interface on the Cisco uBR-MC3GX60V-RPHY Line Card.

Troubleshooting: Cisco CMC is Not Working

Problem    The Cisco CMC is online but the cable modem fails to come online.
Possible Cause    The Cisco uBR-MC3GX60V-RPHY line card is not properly configured.
Solution    Verify the configuration on the Cisco uBR-MC3GX60V-RPHY line card. See Configuring the Cisco Remote-PHY Solution.
Possible Cause    The Cisco CMC is not properly connected to the line card.
Solution    Verify the connection between Cisco uBR-MC3GX60V-RPHY line card and Cisco CMC.

Troubleshooting: The Cisco uBR-MC3GX60V-RPHY Line Card is Not Working

Problem    The Cisco uBR-MC3GX60V-RPHY line card is not working.
Possible Cause    The Cisco uBR-MC3GX60V-RPHY line card is not connected to the power supply.
Solution    Verify if the power LED is illuminated and the power supply is connected to the Cisco uBR-MC3GX60V-RPHY line card. Connect to the power supply, if not connected.
Possible Cause    The Cisco uBR-MC3GX60V-RPHY line card is not configured on the Cisco CMTS.
Solution    Configure the Cisco uBR-MC3GX60V-RPHY line card. See Configuring the Cisco Remote-PHY Solution.
Possible Cause    The captive screws are not secured on the faceplate and the ejector levers are not properly closed.
Solution    Close the ejector levers and tighten the captive screws with your fingers. Then, use either a T-­10 Torx or a common flathead screwdriver to tighten the captive screws from 5 to 7 in-­lbs.
Possible Cause    The Cisco uBR-MC3GX60V-RPHY line card is not firmly seated in the chassis.
Solution    Unscrew the top and bottom captive screws on the line card using a T-­10 Torx driver tool or flathead screwdriver. Simultaneously pivot both ejector levers away from the line card to disengage the line card. Slide the line card partially out of the slot in the chassis and slide it back in until it is firmly seated in the chassis. Close the ejector levers and tighten the captive screws with your fingers. Then, use either a T-­10 Torx or a common flathead screwdriver to tighten the captive screws from 5 to 7 in-­lbs.
Possible Cause    The network cable connectors are not properly seated in the ports on the Cisco uBR-MC3GX60V-RPHY line card and cables are broken.
Solution    Verify if the cables are broken. Replace the cables, if broken and insert the network cable connector into the SFP module port until it clicks and locks into place to ensure proper seating..
Possible Cause    Incorrect or inappropriate software license is configured on the Cisco uBR-MC3GX60V-RPHY line card.
Solution    Reinstall or rehost the appropriate license on the Cisco uBR-MC3GX60V-RPHY line card.
Possible Cause    Power on Self Test (POST) fails when the line card is installed in the chassis.
Solution    Verify the power supply connection and if the problem persists, contact the Technical Assistance Center (TAC) for further assistance.

Troubleshooting: The DTI Timer is Not Working

Problem    The DOCSIS Timing Interface (DTI) timer is not working correctly and the cable modems are not in init() state.
Possible Cause    DTI-based timing is disabled on the active card.
Solution    Use the show cable clock command to identify the active card and enable the DTI-based timing using the cable clock dti command.