Cisco Systems UBR900 User Manual

 Configuring the Cisco uBR900 Series Cable Access Routers 123

Use the the debug cable-modem error command in privileged EXEC mode to enable debugging 
messages for the cable interface driver. To turn the debugging messages off, use the no form of this 
command.

[no] debug cable-modem error

Syntax Description

This command has no keywords or arguments.

Defaults

No default behavior or values.

Command Modes

Privileged EXEC 

Command History

Usage Guidelines

This command displays detailed output about the sanity checking of received frame formats, the 
acquisition of downstream QAM/FEC lock, the receipt or non-receipt of SYNC messages from the 
CMTS, reception errors, and bandwidth request failures.

Examples

The following example shows sample display output for the debug cable-modem error privileged 
EXEC command:

uBR924# debug cable-modem error

*Mar  7 20:16:29: AcquireSync(): Update rate is 100 Hz

*Mar  7 20:16:30: 1st Sync acquired after 1100 ms.

*Mar  7 20:16:30: Recovery loop is locked (7/9)

*Mar  7 20:16:30: 2nd Sync acquired after 100 ms.

*Mar  7 20:16:30: Recovery loop is locked (10/15)

11.3 NA

This command was introduced.