Troubleshooting Tips

You can display other aspects of the MAC layer by using variations of the show controller cable-modem 0 mac command:

uBR904# show controller cable-modem 0 mac ?

errors

Mac Error

Log data

hardware

All

CM Mac Hardware registers

log

Mac

log data

resets

Resets of

the MAC

state

Current MAC state

For examples and descriptions on how to use these keywords, see the show controller cable-modem mac command reference page.

Interpret the MAC Log File and Take Action

The MAC log file explains a detailed history of initialization events that occurred in the cable modem. All pertinent troubleshooting information is stored here.

The following sample log file is organized by chronological sequence event. Sample comments are also included.

Event 1—Wait for the Link to Come Up

Event 2—Scan for a Downstream Channel then Synchronize

Event 3—Obtain Upstream Parameters

Event 4—Start Ranging for Power Adjustments

Event 5—Establish IP Connectivity

Event 6—Establish the Time of Day

Event 7—Establish Security

Event 8—Transfer Operational Parameters

Event 9—Perform Registration

Event 10—Comply with Baseline Privacy

Event 11—Enter the Maintenance State

Event 1—Wait for the Link to Come Up

The MAC layer informs the cable modem’s drivers that it needs to reset. This is the first event that happens after the modem powers up and begins initialization. The fields LINK_DOWN and LINK_UP are similar to a shut and no shut on a standard Cisco interface.

uBR904# show controller cable-modem 0 mac log

528302.040

CMAC_LOG_LINK_DOWN

 

528302.042

CMAC_LOG_RESET_FROM_DRIVER

 

528302.044

CMAC_LOG_STATE_CHANGE

wait_for_link_up_state

528302.046

CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN

0x08098D02

528302.048

CMAC_LOG_LINK_DOWN

 

528308.428

CMAC_LOG_DRIVER_INIT_IDB_RESET

0x08098E5E

528308.432

CMAC_LOG_LINK_DOWN

 

528308.434

CMAC_LOG_LINK_UP

 

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Cisco Systems UBR904 manual Interpret the MAC Log File and Take Action, Event 1-Wait for the Link to Come Up

UBR904 specifications

The Cisco UBR904 is a versatile broadband access device designed to deliver high-speed internet and data services in various deployment scenarios, particularly suitable for cable operators and service providers. This device allows operators to provide broadband services over a wide area, utilizing advanced technologies to ensure reliability and performance.

One of the key features of the UBR904 is its capability to support multiple channels for upstream and downstream communication, allowing for greater bandwidth and improved network performance. With its integrated DOCSIS (Data Over Cable Service Interface Specification) compliance, the UBR904 enables operators to leverage existing coaxial cable infrastructures to deliver data services efficiently. This makes it an ideal choice for operators looking to expand their service offerings without the need for extensive infrastructure changes.

Equipped with a powerful processor and ample memory, the UBR904 is designed for high throughput and low latency, supporting IP data services, voice services, and video on demand. It utilizes advanced modulation techniques and error correction algorithms that enhance data transmission efficiency and reliability. This results in a robust platform capable of meeting the demands of high-density areas while accommodating future growth.

The UBR904 also features flexible management capabilities. It includes support for SNMP (Simple Network Management Protocol), enabling operators to monitor and manage network performance effectively. The device can be easily configured through a graphical user interface or command-line interface, providing system administrators with the tools needed for straightforward deployment and maintenance.

In addition to its core functionalities, the UBR904 integrates security features to protect network traffic and ensure user data integrity. This includes capabilities for secure tunneling and access control lists, which enhance the security of the broadband connection.

Furthermore, the Cisco UBR904 is designed with scalability in mind. Operators can easily scale their networks by adding additional modules or interfaces as demand grows. This ensures that the UBR904 can meet the evolving needs of service providers without necessitating a complete hardware overhaul.

In summary, the Cisco UBR904 is a robust, feature-rich broadband access device that combines high performance, advanced technologies, and scalability, making it an excellent choice for operators looking to deliver high-speed internet and data services across diverse environments. Its ease of use and extensive management features further enhance its appeal, positioning it as a key player in the broadband access market.