Cisco uBR10-SRP-OC12SML Specifications download pdf (Page 159)

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Cisco uBR10012 Universal Broadband Router Software Configuration Guide

OL-1520-05

Chapter3 Configuring Cable Interface Features for the CiscouBR10012Router

Configuring the Upstream Cable Interface

Note Software adjustments of 1 to 3 dB can be used to adjust for minor variations in measurement or setup

and port-to-port calibration differences. These adjustments can significantly improve cableinterface

performance, particularly in marginal situations. Larger adjustments should be made in conjunction

with spectrum analyzer support at the headend or distribution hub.

Specifying Upstream Minislot Size

To specify the minislot size (in ticks) for specific upstream cable interfaces, use the following command

in cable interface configuration mode. Acceptable values are 2, 4, 8, 16, 32, 64, and 128. The default is 8.

Router(config-if)# cable upstream usport minislot-size size

For additional information about channel width and minislot size, refer to the Cable Radio Frequency

(RF) FAQs at http://www.cisco.com/warp/public/109/cable_faq_rf.html.

Verifying Upstream Minislot Size

To verify upstream minislot size, enter the show controllers cable command for the upstream port you

have just configured:

Router# show controllers cable5/0/0 u0

Cable5/0/0 Upstream 0 is up

Frequency 24.016 MHz, Channel Width 1.600 MHz, QPSK Symbol Rate 1.280 Msps

Spectrum Group is overridden

SNR 33.2560 dB

Nominal Input Power Level 0 dBmV, Tx Timing Offset 2288

Ranging Backoff automatic (Start 0, End 3)

Ranging Insertion Interval automatic (60 ms)

Tx Backoff Start 0, Tx Backoff End 4

Modulation Profile Group 1

part_id=0xFFFF, rev_id=0xFF, rev2_id=0xFF

nb_agc_thr=0x0000, nb_agc_nom=0x0000

Range Load Reg Size=0x58

Request Load Reg Size=0x0E

Minislot Size in number of Timebase Ticks is = 8

Minislot Size in Symbols = 64

Bandwidth Requests = 0xFE

Piggyback Requests = 0xD

Invalid BW Requests= 0x2

Minislots Requested= 0x2963

Minislots Granted = 0x2963

Minislot Size in Bytes = 16

Map Advance = 4000 usecs

UCD Count = 32964

DES Ctrl Reg#0 = C000C043, Reg#1 = 0

Perform these steps if you are having difficulty with verification:

Step1 Ensure that the cable connections are not loose or disconnected.

Step2 Ensure that the cable interface line card is firmly seated in its chassis slot.

Step3 Ensure that the captive installation screws are tight.

Step4 Verify that you have entered the correct slot and port numbers.

Step5 Verify that you selected a valid frequency for your router.

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Cisco uBR10-SRP-OC12SML Specifications Page 159

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