Configuring Concatenation on the Cisco uBR7200 Series Cable Router

Feature Overview

Concatenation is now configurable. You can turn it on or off.

Benefits

Some modems experience problems when concatenation is enabled. This feature allows you to prevent concatenation-related problems by allowing you to turn it off.

Restrictions

This feature is not supported on the MC11 modem card as the MC11 does not support concatenation.

Related Features and Technologies

Table 1 lists the IOS cable router features released in the IOS 12.0 timeframe.

Table 1 uBR7200 Series Cable Router Features Available Since 12.0 T

Available With: Category Feature

11.3(5)NA & 12.0(3)T

Cable Features

Feature Enhancements

11.3(6)NA

MC16 Modem Card

11.3(8)NA

Access List Support Enhancements

12.0(4)T

Downstream Channel ID Configuration

12.0(4)T

Multiple Service ID Support

12.0(4)T

Cable Modem and Host Subnet Addressing

12.0(5)T

Telephone Return

12.0(5)T

Time Server Functionality

12.0(7)T

Amplitude Averaging Compensation

12.0(7)XR

Cable Interface Bundling

12.0(7)XR

Enhanced Modem Status Display

12.0(7)XR

Show Interface Cable Command Verbose Enhancements

12.0(7)XR

IP Address Verification

12.0(7)XR

Registration Timeout Configuration

12.0(7)XR

Show Cable Modem Command Enhancements

12.0(7)XR

Modem Status Summary Enhancements

12.0(7)XR

Show Controller Command Enhancements

12.0(7)XR

Configuring Concatenation

12.0(7)XR

Virtual Private Network Support

12.0(7)XR

Blind Hopping Support on the MC16S Modem Card

12.0(7)XR

Signal-to-Noise Ratio Data Support

11.3(9)NA and 12.0(4)T

Cable QoS

QoS Profile Enforcement

12.0(4)T

Quality of Service for Voice

11.3(9)NA

Network Management

Upstream Traffic Shaping Feature

12.0(5)T

Enhanced-Spectrum Management

12.0(5)T

Downstream Rate Shaping with TOS bits

12.0(7)XR

Spectrum Management Using the MC16S Modem Card

12.0(7)XR

Downstream Test Signals Configuration

12.0(7)XR

Wireless Features

Point-to-Point Wireless Support

Available With:	Category	Feature
11.3(5)NA & 12.0(3)T	Cable Features	Feature Enhancements
11.3(6)NA		MC16 Modem Card
11.3(8)NA		Access List Support Enhancements
12.0(4)T		Downstream Channel ID Configuration
12.0(4)T		Multiple Service ID Support
12.0(4)T		Cable Modem and Host Subnet Addressing
12.0(5)T		Telephone Return
12.0(5)T		Time Server Functionality
12.0(7)T		Amplitude Averaging Compensation
12.0(7)XR		Cable Interface Bundling
12.0(7)XR		Enhanced Modem Status Display
12.0(7)XR		Show Interface Cable Command Verbose Enhancements
12.0(7)XR		IP Address Verification
12.0(7)XR		Registration Timeout Configuration
12.0(7)XR		Show Cable Modem Command Enhancements
12.0(7)XR		Modem Status Summary Enhancements
12.0(7)XR		Show Controller Command Enhancements
12.0(7)XR		Configuring Concatenation
12.0(7)XR		Virtual Private Network Support
12.0(7)XR		Blind Hopping Support on the MC16S Modem Card
12.0(7)XR		Signal-to-Noise Ratio Data Support
11.3(9)NA and 12.0(4)T	Cable QoS	QoS Profile Enforcement
12.0(4)T		Quality of Service for Voice
11.3(9)NA	Network Management	Upstream Traffic Shaping Feature
12.0(5)T		Enhanced-Spectrum Management
12.0(5)T		Downstream Rate Shaping with TOS bits
12.0(7)XR		Spectrum Management Using the MC16S Modem Card
12.0(7)XR		Downstream Test Signals Configuration
12.0(7)XR	Wireless Features	Point-to-Point Wireless Support

Supported Platforms

uBR7200 series cable router

Supported Standards, MIBs, and RFCs

Standards

No new or modified standards are supported by this feature.

MIBs

No new or modified MIBs are supported by this feature.

RFCs

No new or modified RFCs are supported by this feature.

Configuration Task

Step	Command	Purpose
1.	Router(config-if)# cable upstream n concatenation	Turns on concatenation on the specified channel.
2.	Router(config-if)# no cable upstream n concatenation	Turns off concatenation on the specified channel.

Monitoring and Maintaining Concatenation

Command	Purpose
Router# show controller cable slot/port	Displays the current status of concatenation for the specified slot and port.

Configuration Examples

The following example indicates (in bold) that concatenation is turned off.

 
Lab-CMTS#show controller cab 3/0

 
Interface Cable3/0

 
Hardware is BCM3210 FPGA

 
 idb 0x6182BE18 MAC regs 0x3D900000 PLX regs 0x3D800000

 
 rx ring entries 1024 tx ring entries 128 MAP tx ring entries 128

 
 Rx ring 0x4B09A400 shadow 0x61849408 head 359

 
 Tx ring 0x4B09C440 shadow 0x6184A478 head 85 tail 85 count 0

 
 MAP Tx ring 0x4B09C880 shadow 0x6184A8E8 head 7 tail 7 count 0

 
 MAP timer sourced from slot 4

 
 throttled 0 enabled 0 disabled 0

 
 Rx: spurious 341 framing_err 0 hcs_err 2 no_buffer 0 short_pkt 2

 
     no_enqueue 0 no_enp 1 miss_count 0 latency 16

 
     invalid_sid 0 invalid_mac 0 bad_ext_hdr_pdu 0 concat 0 bad-concat 0

 
 Tx:  full 0 drop 0 stuck 0 latency 1

 
 MTx: full 0 drop 0 stuck 0 latency 9

 
 Slots 68056 NoUWCollNoEngy 15 FECorHCS 2 HCS 0

 
 Req 1803579865 ReqColl 1 ReqNoise 276120 ReqNoEnergy 0

 
 ReqData 0 ReqDataColl 0 ReqDataNoise 0 ReqDataNoEnergy 0

 
 Rng 143099 RngColl 0 RngNoise 3891

 
 FECBlks 0 UnCorFECBlks 0 CorFECBlks 0

 
 MAP FIFO overflow 0, Rx FIFO overflow 0, No rx buf 0

 
 DS FIFO overflow 0, US FIFO overflow 0, US stuck 0

 
 Bandwidth Requests= 0xFFC9

 
 Piggyback Requests= 0xA1D

 
 Ranging Requests= 0x22039

 
 Timing Offset = 0x0

 
 Bad bandwidth Requests= 0x31BC

 
 No MAP buffer= 0x0

 
 Cable3/0 Downstream is up

 
  Frequency not set, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 Msps

 
  FEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4

 
  Downstream channel ID: 0

 
 Cable3/0 Upstream 0 is up

 
  Frequency 20.208 MHz, Channel Width 1.600 MHz, QPSK Symbol Rate 1.280 Msps

 
  Spectrum Group is overridden

 
  SNR - Unknown

 
  Nominal Input Power Level 0 dBmV, Tx Timing Offset 4667

 
  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

 
  Concatenation is disabled

 
  part_id=0x3136, rev_id=0x05, rev2_id=0x64

 
  nb_agc_thr=0x3000, 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 = 0xFFD0

 
  Piggyback Requests = 0xA1D

 
  Invalid BW Requests= 0x31BC

 
  Minislots Requested= 0x1A21F3

 
  Minislots Granted  = 0x1A21F3

 
  Minislot Size in Bytes = 16

 
  Map Advance = 4000 usecs

 
  UCD Count = 46643

Command Reference

This section documents the new cable upstream concatenation command. All other commands used with this feature are documented in the Cisco IOS Release 12.0T command reference publications.

cable upstream concatenation

To turn concatenation on or off, use the cable upstream concatenating interface configuration command. To turn off concatenation, use the no form of this command.

: cable upstream n concatenation
: no cable upstream n concatenation

Syntax Description

n	Specifies the upstream channel.

Default

Enabled

Command Mode

Interface configuration

Command History

Release	Modification
12.0(7)XR	This command was introduced.

Usage Guidelines

Since the MC11 modem card does not support concatenation, this command is not supported on this card. Concatenation is always disabled for the MC11 modem card.

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