Cisco uBR10-SRP-OC12SML Specifications download pdf (Page 109)

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Cisco uBR10012 Universal Broadband Router Software Configuration Guide

OL-1520-08

Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software

Supported Software Features for the CiscouBR10012 Router

ranging slots at roughly the same time. Without theCiscouBR10012router algorithms enabled, CMs can

repeatedly collide and back off a random number of initial ranging slots independently before trying

again.

With CiscouBR10012router algorithms enabled, the CMTS can detect such high-contention scenarios,

and can increase the frequency of initial ranging slots to assist in quick resolution of ranging contention.

After the high collision state is over—few persistent ranging collisions occur on the upstream—the

CMTS detects this condition and switches back to the steady state mode. In the steady state mode, the

frequency of initial ranging slots is a function of the upstream channel utilization. If extra upstream

bandwidth is available, the CMTS allocates more initial upstream ranging slots. As soon as the MAC

scheduler needs the upstream bandwidth for data grants, the MAC scheduler reduces the frequency of

initial ranging slots.

For additional information about dynamic ranging on multiple components, refer to the Cisco Web site

at http://www.cisco.com.

Flap List Support

The cable flap list troubleshooting feature tracks “flapping” CMs—CMs that have intermittent

connectivity problems. Such connectivity problems might originate in the upstream or downstream

portion of the cable plant, or originate in the CM itself. For additional information, refer to flap list

information contained in the Cisco Cable Modem Termination System Feature Guide.

Online Offline Diagnostics (OOD) Support for the Cisco uBR10012 Universal Broadband Router

Cisco IOS Release 12.3(13a)BC introduces support for Online Offline Diagnostics (OOD) in the field

for the Cisco uBR1002 router, including support in a high availability environment with HCCP N+1

Redundancy. The Online Offline Diagnostics(OOD) feature introduces a Field Diagnostic tool that

provides a method of testing and verifying line card hardware problems.

This feature is supported on the following field replaceable units (FRUs) of the Cisco uBR10012 router:

• Cisco uBR10012 PRE1 and PRE2 Performance Routing Engine (PRE1 and PRE2) modules

• Cisco uBR10K-MC520S/U broadband processing engine (BPE)

• Cisco uBR10012 OC-48 DPT/POS WAN interface module

To view a list of hardware on the Cisco uBR10012 router that is supported by Field Diagnostics, refer

to the following document:

• Online Offline Diagnostics—User’s Guide for Cisco uBR10012 Router Field Diagnostics

http://www.cisco.com/univercd/cc/td/doc/product/cable/ubr10k/ubr10kts/index.htm

If you would like to perform a hardware diagnostic test on a line card in your Cisco uBR10000 series

router, an OOD Field Diagnostic image can be downloaded free of charge from Cisco Systems and used

to test whether the line card problems are indeed due to faulty hardware. The test results verify whether

or not the hardware is faulty.

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Cisco uBR10-SRP-OC12SML Specifications Page 109