CMAC_LOG_RANGING_SUCCESS
CMAC_LOG_POWER_LEVEL_IS

Troubleshooting Tips

Event 3—Obtain Upstream Parameters

The cable modem waits for an upstream channel descriptor messages (UCD) from the headend Cisco uBR7246. This is done to retrieve transmission parameters for the upstream channel.

508146.124

CMAC_LOG_STATE_CHANGE

wait_ucd_state

508147.554

CMAC_LOG_UCD_MSG_RCVD

3

508147.558

CMAC_LOG_UCD_NEW_US_FREQUENCY

20000000

508147.558

CMAC_LOG_SLOT_SIZE_CHANGED

8

508147.622

CMAC_LOG_FOUND_US_CHANNEL

1

508147.624

CMAC_LOG_STATE_CHANGE

wait_map_state

508148.058

CMAC_LOG_MAP_MSG_RCVD

 

508148.060

CMAC_LOG_INITIAL_RANGING_MINISLOTS

40

Event 4—Start Ranging for Power Adjustments

The ranging process adjusts cable modem’s transmit power. The cable modem performs ranging in two stages, ranging state 1 and ranging state 2.

The field

modem to adjust to. The field successful.

is the power level that the Cisco uBR7246 told the cable indicates that the ranging adjustment was

508148.062

CMAC_LOG_STATE_CHANGE

ranging_1_state

508148.064

CMAC_LOG_RANGING_OFFSET_SET_TO

9610

 

508148.066

CMAC_LOG_POWER_LEVEL_IS

28.0

dBmV (commanded)

508148.068

CMAC_LOG_STARTING_RANGING

 

 

508148.070

CMAC_LOG_RANGING_BACKOFF_SET

0

 

508148.072

CMAC_LOG_RNG_REQ_QUEUED

0

 

508148.562

CMAC_LOG_RNG_REQ_TRANSMITTED

 

 

508148.566

CMAC_LOG_RNG_RSP_MSG_RCVD

 

 

508148.568

CMAC_LOG_RNG_RSP_SID_ASSIGNED

2

 

508148.570

CMAC_LOG_ADJUST_RANGING_OFFSET

2408

 

508148.572

CMAC_LOG_RANGING_OFFSET_SET_TO

12018

 

508148.574

CMAC_LOG_ADJUST_TX_POWER

20

 

508148.576

CMAC_LOG_POWER_LEVEL_IS

33.0

dBmV (commanded)

508148.578

CMAC_LOG_STATE_CHANGE

ranging_2_state

508148.580

CMAC_LOG_RNG_REQ_QUEUED

2

 

508155.820

CMAC_LOG_RNG_REQ_TRANSMITTED

 

 

508155.824

CMAC_LOG_RNG_RSP_MSG_RCVD

 

 

508155.826

CMAC_LOG_ADJUST_RANGING_OFFSET

-64

 

508155.826

CMAC_LOG_RANGING_OFFSET_SET_TO

11954

 

508155.828

CMAC_LOG_RANGING_CONTINUE

 

 

508165.892

CMAC_LOG_RNG_REQ_TRANSMITTED

 

 

508165.894

CMAC_LOG_RNG_RSP_MSG_RCVD

 

 

508165.896

CMAC_LOG_ADJUST_TX_POWER

-9

 

508165.898

CMAC_LOG_POWER_LEVEL_IS

31.0

dBmV (commanded)

508165.900

CMAC_LOG_RANGING_CONTINUE

 

 

508175.962

CMAC_LOG_RNG_REQ_TRANSMITTED

 

 

508175.964

CMAC_LOG_RNG_RSP_MSG_RCVD

 

 

508175.966

CMAC_LOG_RANGING_SUCCESS

 

 

12Release 11.3(4)NA

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Cisco Systems UBR904 manual Event 3-Obtain Upstream Parameters, Event 4-Start Ranging for Power Adjustments

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.