DSP Optimization on the Cisco 1751, Cisco 1760, and Cisco 2801 Routers [Cisco 1700 Series Modular Access Routers]

Table Of Contents

DSP Optimization on the Cisco 1751, Cisco 1760, and Cisco 2801 Routers

DSP Optimization

Cisco 1751 and Cisco 1760 Routers

Cisco 2801 Routers

DSP Resource Calculator

Codec Complexity

Restrictions

Prerequisites

Configuring Codec Complexity

Verification Example

Example 1

Example 2

Related Documents

Obtaining Documentation

Cisco.com

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Cisco Technical Support Website

Submitting a Service Request

Definitions of Service Request Severity

Obtaining Additional Publications and Information

DSP Optimization on the Cisco 1751, Cisco 1760, and Cisco 2801 Routers

This document describes optimizing the digital signal processor (DSP) resources among voice services, including transcoding and conferencing, on the Cisco 1751, Cisco 1760, and Cisco 2801 routers. It also describes new software configuration information for changing the codec complexity of analog voice interface cards (VICs).

This document contains the following sections:

•DSP Optimization

•Codec Complexity

•Related Documents

•Obtaining Documentation

DSP Optimization

This section describes the extent of DSP optimization possible on both analog voice cards and digital voice cards when DSPs provide voice services, including transcoding and conferencing.

Cisco 1751 and Cisco 1760 Routers

Cisco 1751 and Cisco 1760 routers use the following PVDMs:

•PVDM-256K-4 (1 DSP)

•PVDM-256K-8 (2 DSPs)

•PVDM-256K-12 (3 DSPs)

•PVDM-256K-16HD (4 DSPs)

•PVDM-256K-20HD (5 DSPs)

Conferencing needs dedicated DSP resources. A DSP will support one conference call with a maximium of six participants. Up to five conferencing calls can be supported on the Cisco 1751 and Cisco 1760 routers.

When conferencing service resources have been allocated, the remaining DSPs can be allocated to the voice and transcoding service requirements. A DSP supports two transcoding channels. Thus, the Cisco 1751 router supports up to 16 transcoding channels, and the Cisco 1760 router supports up to 20 transcoding channels.

DSP usage for voice channel allocation can be optimized by changing the codec complexity of the analog VICs.

With a medium-complexity codec configured:

•One DSP can serve four analog voice ports.

•If one DSP serves only two analog ports (due to an odd number of 2-port analog VICs in the system), one BRI port (2 channels) can also be served by this DSP.

With a high-complexity codec configured:

•One DSP can serve two analog voice ports.

After the DSP channels are assigned to all the analog cards, the remaining unused DSP resources will first be assigned to the BRI ports and then assigned to the T1/E1 channels.

Cisco 2801 Routers

Cisco 2801 routers use the following PVDMs:

•PVDM2-8 (1 DSP)

•PVDM2-16 (1 DSP)

•PVDM2-32 (2 DSPs)

•PVDM2-48 (3 DSPs)

•PVDM2-64 (4 DSPs)

Conferencing needs dedicated DSP resources. A DSP will support eight conference calls on a G.711 codec, or two conference calls on a G.729/G.711 configuration. (The PVDM2-8 will support four conference calls on G.711 or 1 conference call on G.729/G.711.) There is a maximium of eight participants per conference. Up to 30 conferencing calls can be supported on the Cisco 2801 routers.

When conferencing service resources have been allocated, the remaining DSPs can be allocated to the voice and transcoding service requirements. A DSP supports six transcoding channels. The Cisco 2801 router supports up to 30 transcoding channels.

DSP usage for voice channel allocation can be optimized by changing the codec complexity of the analog VICs.

With a medium-complexity codec configured:

•One DSP can serve eight analog voice ports.

With a high-complexity codec configured:

•One DSP can serve six analog voice ports.

After the DSP channels are assigned to all the analog cards, the remaining unused DSP resources will first be assigned to BRI ports and then assigned to T1/E1 channels.

DSP Resource Calculator

The DSP Resource Calculator is a web-based tool that helps the user to calculate the number of DSPs required on the system and that determines the number of calls that can be handled simultaneously using each of the codec standards. Users are required to input information such as the platform type, IOS release number, VIC slot configuration, and the type of codecs they wish to use on these interfaces. The tool then displays the number of DSPs required to run the configuration and generates the necessary configuration that the user would be prompted to input in order to start the system.

To see the DSP Resource Calculator application, refer to the following URL:

www.cisco.com/cgi-bin/Support/DSP/dsp-calc.pl

Codec Complexity

Codec complexity refers to the amount of processing power that a codec compression technique requires. Some codecs require more processing power than others. Codec complexity affects call density, which is the number of calls that can take place simultaneously on the DSP interface.

Codec complexity can be either low, medium, or high. The differences in complexity betweenthese codecs are in the amount of CPU power necessary to run the algorithm and, therefore, the number of voice channels that can be supported by a single DSP.

The Cisco 1751 and Cisco 1760 routers support medium-complexity modes, which serve a maximum of four voice channels. They also support two types of high-complexity (HC) modes: the analog HC mode, which serves two voice channels, and the digital Flexi-6 HC mode, which serves up to six voice channels.

The Cisco 2801 router supports medium-complexity modes which serve a maximum of eight voice channels, high complexity modes which serve six voice channels, and the Flexi mode, which is capable of serving up to 16 voice channels.

Restrictions

The codec complexity feature has the following restrictions:

•Codec complexity can be changed only on analog VICs.

•The complexity type selected by the user can restrict the codecs supported. When medium complexity is selected, the G.723 and G.728 codecs are not supported.

•After the codec complexity command is executed, depending on the DSP resources available, the voice ports on the router can be added, or deleted, or they can remain the same.

•If there are an odd number of analog VICs and one BRI VIC in the system, one BRI port can be served by the medium-complexity DSP while another BRI port can be served by the high-complexity Flexi-6 DSP.

Prerequisites

Before configuring the voice ports, calculate the number of DSPs required to run the configuration and generate the necessary configuration in order to start the system. See the "DSP Resource Calculator" section.

Before changing the codec complexity, you must shut down all voice ports. Follow these steps to shut down the voice ports:

1. Remove all ds0-group, pri-group, and cas-custom configurations that add voice ports in the router from all T1 and E1 controllers.

2. Use the shutdown command in the BRI interface configuration mode to shut down all the BRI interfaces.

3. Use the shutdown command in the voice-card configuration mode to shut down all the analog VICs.

Configuring Codec Complexity

To configure the codec complexity on the analog VIC, use the following commands, beginning in privileged EXEC mode:

Command

Purpose

Step 1

Router # show voice dsp

Checks the DSP voice channel activity. If any of the DSP voice channels is busy, the codec complexity cannot be changed.

Step 2

Router # show voice port summary

Verifies that all the DSP voice channels are in shutdown state and that no ds0-group is configured in the T1/E1 interfaces.

When all the DSP channels are in the idle state, continue to Step 3.

Step 3

Router # configure terminal

Enters global configuration mode.

Step 4

Router(config)# voice-card 0

Enters voice-card configuration mode and specifies that the voice card is in slot 0. In the Cisco 1751 routers, the slot numbers range from 0 to 2; in the Cisco 1760 and Cisco 2801 routers, the slot numbers range from 0 to 3.

Step 5

Router(config-voicecard)# codec complexity {high | medium}

(For analog voice ports) Specifies the codec complexity, based on the codec standard being used.

The keywords are as follows:

•high—Specifies two voice channels encoded in the following formats:

G.711a-law, G.711u-law, G.723 Annex A(r5.3),

G.723 Annex A(r6.3), G.723(r5.3), G.723(r6.3),

G.726(r16), G.726(r24), G.726(r32), G.728

G.729(br8), G.729(r8).

•medium—Specifies four voice channels encoded in the following formats:

G.711a-law, G.711u-law, G.726(r16),

G.726(r24), G.726(r32), G.729(br8), G.729(r8).

Configuring the codec complexity as medium, blocks the G.723(8) and G.728 voice calls on the voice-card.

Using the no form of this command will restore the default.

Verification Example

The following examples show codec complexity verification on the Cisco 1751 and Cisco 1760 routers.

Example 1 and Example 2 show scenarios in which codecs of different complexities are configured on the Cisco 1760 router. In these examples the router has a dual FXS VIC in slot 0 and slot 3, a T1 2-port multiflex VWIC in slot 1, and a dual NT or TE BRI VIC in slot 2.

Example 1

In this example, the FXS analog voice card in slot 0 and slot 3 are both configured with high-complexity codec.

Enter the show voice dsp command to check the status of the active voice calls, the number of MIPS consumed, and the DSP assigned to the voice ports:
router-1760#show voice dsp
DSP  DSP             DSPWARE CURR  BOOT                         PAK     TX/RX
TYPE NUM CH CODEC    VERSION STATE STATE   RST AI VOICEPORT TS ABORT  PACK COUNT
==== === == ======== ======= ===== ======= === == ========= == ===== ============
C549 000 00 g711ulaw     3.6 Idle  Idle      0  0 0/0       NA     0         9/0
C549 000 01 g711ulaw     3.6 Idle  Idle      0  0 0/1       NA     0         9/0
C549 001 00 g711ulaw     3.6 Idle  Idle      0  0 3/0       NA     0         9/0
C549 001 01 g711ulaw     3.6 Idle  Idle      0  0 3/1       NA     0         9/0
C549 002 00 g711ulaw     3.6 Idle  Idle      0  0 2/0       NA     0         0/0
C549 002 01 g711ulaw     3.6 Idle  Idle      0  0 2/0       NA     0         0/0
C549 002 02 g711ulaw     3.6 Idle  Idle      0  0 2/1       NA     0         0/0
C549 002 03 g711ulaw     3.6 Idle  Idle      0  0 2/1       NA     0         0/0
 Active Voice Call details
Current total analog signalling channels:4
Current max allowed digital timeslot for voice:48
Current number of DSP group:1
Group 0:
 Current allocated analog signalling channels:4
 Current free analog signalling channels:0
 Current allocated digital signalling channels:4
 Current free digital signalling channels:44
 Port(s) served:0/0  0/1  1/0  1/1  3/0  3/1  2/0  2/1
 Current Available MIPS:1000
 SPMM  DSPRM  State   Image     D-sig  D-sig     A-sig  A-sig  Mips Voice/Xcode
  Dsp   Dsp                  allocate   free  allocate   free  Free     Chan
  0/0     0      UP   FIXHC         0      0         2      0   100        0
  0/1     1      UP   FIXHC         0      0         2      0   100        0
  0/2     2      UP   FLEX6         4      2         0      0   100        0
  0/3     3      UP   FLEX6         0      6         0      0   100        0
  0/4     4      UP   FLEX6         0      6         0      0   100        0
  1/0     5      UP   FLEX6         0      6         0      0   100        0
  1/1     6      UP   FLEX6         0      6         0      0   100        0
  1/2     7      UP   FLEX6         0      6         0      0   100        0
  1/3     8      UP   FLEX6         0      6         0      0   100        0
  1/4     9      UP   FLEX6         0      6         0      0   100        0
Enter the show voice port summary command to display summary information for all the voice 
ports:
router-1760# show voice port summary
PORT      CH   SIG-TYPE   ADMIN OPER STATUS   STATUS   EC
========= == ============ ===== ==== ======== ======== ==
0/0       --  fxs-ls      up    dorm on-hook  idle     y 
0/1       --  fxs-ls      up    dorm on-hook  idle     y 
2/0       1   bri-voice   up    up   none     none     y 
2/0       2   bri-voice   up    up   none     none     y 
2/1       1   bri-voice   up    up   none     none     y 
2/1       2   bri-voice   up    up   none     none     y 
3/0       --  fxs-ls      up    dorm on-hook  idle     y 
3/1       --  fxs-ls      up    dorm on-hook  idle     y 
1/0:0     01  e&m-wnk     up    dorm idle     idle     y 
1/0:0     02  e&m-wnk     up    dorm idle     idle     y 
1/0:0     03  e&m-wnk     up    dorm idle     idle     y 
1/0:0     04  e&m-wnk     up    dorm idle     idle     y 
1/0:0     05  e&m-wnk     up    dorm idle     idle     y 
1/0:0     06  e&m-wnk     up    dorm idle     idle     y 
1/0:0     07  e&m-wnk     up    dorm idle     idle     y 
1/0:0     08  e&m-wnk     up    dorm idle     idle     y 
1/0:0     09  e&m-wnk     up    dorm idle     idle     y 
1/0:0     10  e&m-wnk     up    dorm idle     idle     y 
1/0:0     11  e&m-wnk     up    dorm idle     idle     y 
1/0:0     12  e&m-wnk     up    dorm idle     idle     y 
1/0:0     13  e&m-wnk     up    dorm idle     idle     y 
1/0:0     14  e&m-wnk     up    dorm idle     idle     y 
1/0:0     15  e&m-wnk     up    dorm idle     idle     y 
1/0:0     16  e&m-wnk     up    dorm idle     idle     y 
1/0:0     17  e&m-wnk     up    dorm idle     idle     y 
1/0:0     18  e&m-wnk     up    dorm idle     idle     y 
1/0:0     19  e&m-wnk     up    dorm idle     idle     y 
1/0:0     20  e&m-wnk     up    dorm idle     idle     y 
1/0:0     21  e&m-wnk     up    dorm idle     idle     y 
1/0:0     22  e&m-wnk     up    dorm idle     idle     y 
1/0:0     23  e&m-wnk     up    dorm idle     idle     y 
1/0:0     24  e&m-wnk     up    dorm idle     idle     y 
Example 2

In this example, the FXS voice card in slot 0 is configured with medium-codec complexity, and the FXS voice card in slot 3 is configured with high-codec complexity. The first BRI port shares the DSP with the FXS port in slot 0, and the second BRI port shares the DSP with the T1 port in slot 1.

Enter the show voice dsp command to check the status of the active voice calls, the number of MIPS consumed, and the DSP assigned to the voice ports:
router-1760#show voice dsp
DSP  DSP             DSPWARE CURR  BOOT                         PAK     TX/RX
TYPE NUM CH CODEC    VERSION STATE STATE   RST AI VOICEPORT TS ABORT  PACK COUNT
==== === == ======== ======= ===== ======= === == ========= == ===== ============
C549 000 00 g711ulaw     3.6 Idle  Idle      0  0 0/0       NA     0     45625/0 
C549 000 01 g711ulaw     3.6 Idle  Idle      0  0 0/1       NA     0     45715/0 
C549 000 02 g711ulaw     3.6 Idle  Idle      0  0 2/0       NA     0      1447/0 
C549 000 03 g711ulaw     3.6 Idle  Idle      0  0 2/0       NA     0      1435/0 
C549 001 00 g711ulaw     3.6 Idle  Idle      0  0 3/0       NA     0     45722/0 
C549 001 01 g711ulaw     3.6 Idle  Idle      0  0 3/1       NA     0     45824/0 
C549 002 00 g711ulaw     3.6 Idle  Idle      0  0 2/1       NA     0         0/0 
C549 002 01 g711ulaw     3.6 Idle  Idle      0  0 2/1       NA     0         0/0 
 Active Voice Call details 
Current total analog signalling channels:6
Current max allowed digital timeslot for voice:48
Current number of DSP group:1
Group 0:
 Current allocated analog signalling channels:6
 Current free analog signalling channels:0
 Current allocated digital signalling channels:26
 Current free digital signalling channels:22
 Port(s) served:0/0  0/1  1/0  1/1  3/0  3/1  2/0  2/1 
 Current Available MIPS:1000
 SPMM  DSPRM  State   Image     D-sig  D-sig     A-sig  A-sig  Mips Voice/Xcode
  Dsp   Dsp                  allocate   free  allocate   free  Free     Chan
  0/0     0      UP   FIXMC         0      0         4      0   100        0
  0/1     1      UP   FIXHC         0      0         2      0   100        0
  0/2     2      UP   FLEX6         6      0         0      0   100        0
  0/3     3      UP   FLEX6         6      0         0      0   100        0
  0/4     4      UP   FLEX6         6      0         0      0   100        0
  1/0     5      UP   FLEX6         6      0         0      0   100        0
  1/1     6      UP   FLEX6         2      4         0      0   100        0
  1/2     7      UP   FLEX6         0      6         0      0   100        0
  1/3     8      UP   FLEX6         0      6         0      0   100        0
  1/4     9      UP   FLEX6         0      6         0      0   100        0
Enter the show voice port summary command to display summary information for all the voice ports:
router-1760# show voice port summary
PORT      CH   SIG-TYPE   ADMIN OPER STATUS   STATUS   EC
========= == ============ ===== ==== ======== ======== ==
0/0       --  fxs-ls      up    dorm on-hook  idle     y 
0/1       --  fxs-ls      up    dorm on-hook  idle     y 
2/0       1   bri-voice   up    up   none     none     y 
2/0       2   bri-voice   up    up   none     none     y 
2/1       1   bri-voice   up    up   none     none     y 
2/1       2   bri-voice   up    up   none     none     y 
3/0       --  fxs-ls      up    dorm on-hook  idle     y 
3/1       --  fxs-ls      up    dorm on-hook  idle     y 
1/0:0     01  e&m-wnk     up    dorm idle     idle     y 
1/0:0     02  e&m-wnk     up    dorm idle     idle     y 
1/0:0     03  e&m-wnk     up    dorm idle     idle     y 
1/0:0     04  e&m-wnk     up    dorm idle     idle     y 
1/0:0     05  e&m-wnk     up    dorm idle     idle     y 
1/0:0     06  e&m-wnk     up    dorm idle     idle     y 
1/0:0     07  e&m-wnk     up    dorm idle     idle     y 
1/0:0     08  e&m-wnk     up    dorm idle     idle     y 
1/0:0     09  e&m-wnk     up    dorm idle     idle     y 
1/0:0     10  e&m-wnk     up    dorm idle     idle     y 
1/0:0     11  e&m-wnk     up    dorm idle     idle     y 
1/0:0     12  e&m-wnk     up    dorm idle     idle     y 
1/0:0     13  e&m-wnk     up    dorm idle     idle     y 
1/0:0     14  e&m-wnk     up    dorm idle     idle     y 
1/0:0     15  e&m-wnk     up    dorm idle     idle     y 
1/0:0     16  e&m-wnk     up    dorm idle     idle     y 
1/0:0     17  e&m-wnk     up    dorm idle     idle     y 
1/0:0     18  e&m-wnk     up    dorm idle     idle     y 
1/0:0     19  e&m-wnk     up    dorm idle     idle     y 
1/0:0     20  e&m-wnk     up    dorm idle     idle     y 
1/0:0     21  e&m-wnk     up    dorm idle     idle     y 
1/0:0     22  e&m-wnk     up    dorm idle     idle     y 
1/0:0     23  e&m-wnk     up    dorm idle     idle     y 
1/0:0     24  e&m-wnk     up    dorm idle     idle     y 
Related Documents

For additional information about installing and configuring the Cisco routers, refer to the following documentation:

•Cisco 17xx Routers Hardware Installation Guide—provides information on installing the Cisco 17xx routers.

•Quick Start Guide - Setting up the Cisco 17xx Routers—provides information for quick installation of the Cisco 17xx routers.

•Cisco 17xx Routers Software Configuration Guide—provides sample networks and router configurations for the Cisco 17xx routers.

•Cisco 2800 Routers Hardware Installation Dcoumentation—provides information on installing the Cisco 2801 routers.

•Quick Start Guide - Setting up the Cisco 2800 Routers—provides information for quick installation of the Cisco 2801 routers.

•Cisco 2800 Routers Software Configuration Documentation—provides sample networks and router configurations for the Cisco 2801 routers.

•Cisco IOS Release 12.3 Configuration Guides and Command References—provide IOS commands and configurations for your router.

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Cisco 1700 Series Modular Access Routers

DSP Optimization on the Cisco 1751, Cisco 1760, and Cisco 2801 Routers

Downloads

Table Of Contents

DSP Optimization on the Cisco 1751, Cisco 1760, and Cisco 2801 Routers

DSP Optimization

Cisco 1751 and Cisco 1760 Routers

Cisco 2801 Routers

DSP Resource Calculator

Codec Complexity

Restrictions

Prerequisites

Configuring Codec Complexity

Verification Example

Example 1

Example 2

Related Documents

Obtaining Documentation

Cisco.com

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Cisco Technical Support Website

Submitting a Service Request

Definitions of Service Request Severity

Obtaining Additional Publications and Information