Cisco Systems UBR904 manual Troubleshooting Tips, Cable Modem Initialization Flowchart

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Troubleshooting Tips

Figure 2 Cable Modem Initialization Flowchart

Power

on

1

2

3

4

5

Scan for

downstream

channel

Downstream

sync

established

Obtain

upstream

parameters

Upstream parameter acquired

Start

Ranging

Ranging and

auto adjust completed

Establish

IP

connectivety

IP

complete

Establish

time of

day

Time of day established

Establish

security

Security

established

Transfer

operational parameters

Transfer complete

Register with

the Cisco uBR7246

Registration

complete

Baseline

privacy

initialization

Baseline

privacy

initialized

Operational

6

7

8

9

10

12960

6Release 11.3(4)NA

Image 6
Contents Feature Summary BenefitsFeature Summary List of TermsPrerequisites Supported MIBs and RFCsList of Terms Cmts to Cable Modem Network Topology Cmts to Cable Modem Network TopologyTroubleshooting Tips Understand How Basic Initialization WorksUnderstand How Basic Initialization Works Troubleshooting Tips Cable Modem Initialization FlowchartConnect to the Cable Modem Display the Cable Modem’s MAC Log File UBR904# show controller cable-modem 0 mac logDisplay the Cable Modem’s MAC Log File Event 1-Wait for the Link to Come Up CmaclogresetfromdriverInterpret the MAC Log File and Take Action UBR904# show controller cable-modem 0 mac ?Interpret the MAC Log File and Take Action Event 4-Start Ranging for Power Adjustments Event 3-Obtain Upstream ParametersEvent 5-Establish IP Connectivity Event 6-Establish the Time of DayEvent 7-Establish Security Event 8-Transfer Operational Parameters Event 9-Perform RegistrationEvent 10-Comply with Baseline Privacy Use Additional Troubleshooting Commands Use Additional Troubleshooting CommandsEvent 11-Enter the Maintenance State Command PurposeCommand Reference Command ReferenceSyntax Description Command ModeShow controller cable-modem Usage GuidelinesRelated Commands Show controller cable-modem bpkm Show controller cable-modem bpkmUBR904# show controller cable-modem 0 bpkm Show controller cable-modem des UBR904# show controller cable-modem 0 des downstream desShow controller cable-modem des Show controller cable-modem filters DsmacdafiltersShow controller cable-modem filters Show controller cable-modem lookup-table Lookup table is displayed in the following exampleShow controller cable-modem lookup-table Errors Show controller cable-modem macShow controller cable-modem mac 014308 528311.396 Cmacloginitialrangingminislots014313 528315.936 Cmaclogadjustrangingoffset 014259 528302.046 CmaclogdriverinitidbshutdownUBR904# show controller cable-modem 0 mac errors CmaclogwatchdogtimerCmaclogresetdhcpwatchdogexpired CmaclogdhcpprocesskilledSample Displays Possible but Uncommon Cable Interface Reset CausesUBR904# show controller cable-modem 0 mac resets Message DescriptionCmaclogresetsecuritywatchdogexpired CmaclogresetprivacywatchdogexpiredCmaclogresetchangeuswatchdogexpired CmaclogresetallfrequenciessearchedCmaclogresetdstunerwatchdog CmaclogresetunabletosetmibobjectInterrupts Irqpend=0x0018, irqmask=0x00E7 DS ID UBR904# show controller cable-modem 0 mac stateTrue 64QAMUS ID Burst Descriptor Interval Usage CodeRanging Backoff Start Show controller cable-modem phy D11=FFD3FFADD12=FFD3FFE0 Show controller cable-modem phy CC CC CC CC CC 0D 0D CC CC CC CC CC CC CC CC 0DShow controller cable-modem tuner Show controller cable-modem tuner Show interface cable-modem AccountingARP Show interface cable-modemUBR904# show int cable-modem 0 accounting UBR904# show int cable-modem 0 countersDebug Commands Debug CommandsBpkm Debug cable-modem bpkmDebug cable-modem bpkm UBR904# debug cable bpkmRelated Commands Debug cable-modem bridge Debug cable-modem bridgeUBR904# debug cable-modem bridge Debug cable-modem error Sample Debug Cable-Modem Error OutputDebug cable-modem error Debug cable-modem interrupts Debug cable-modem interruptsUBR904# debug cable-modem interrupts Debug cable-modem mac Debug cable-modem mac Sample Debug Cable-Modem Mac Log OutputUBR904# debug cable-modem mac log UBR904# debug cable mac log UBR904# debug cable mac log verboseDebug cable mac messages Rsvd CC 0DEhdr MAC Management Message HeaderDebug cable-modem map Debug cable-modem mapDebug cable-modem map What to do Next What to do Next
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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.