Configuring Cisco MC3810 Series Concentrators
to Use High-Performance Compression Modules
This document describes feature changes introduced in Cisco IOS Release 12.0(7)XK and supported in
Cisco IOS Release 12.1(2)T and later for Cisco MC3810 series concentrators that contain
high-performance voice compression modules (HCMs).
This document includes the following sections:
• “Feature Overview” on page 1
• “Supported Platforms” on page 2
• “Supported Standards, MIBs, and RFCs” on page 3
• “Prerequisites” on page 3
• “Configuration Tasks” on page 3
• “Command Reference” on page 7
Feature Overview
High-performance voice compression modules (HCMs) provide voice compression according to the
voice compression coding algorithm (codec) specified when the Cisco MC3810 is configured. Table 1
shows the number of voice channels each type of compression module can support.
Table 1 Voice Compression Module Application Information
Voice Channels
Type Codec Packaging Complexity (see Table 2)
HCM2 High complexity (codec complexity set to high)4
Medium complexity (codec complexity set to medium)8
HCM6 High complexity (codec complexity set to high)12
Medium complexity (codec complexity set to medium)24
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Benefits
Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
Table 2 Codec Packaging Information
Codec Packaging Codecs
High complexity G.711ulaw, G.711alaw
G.723.1(r5.3), G.723.1 Annex A(r5.3), G.723.1(r6.3), G.723.1 Annex A(r6.3)
G.726(r16), G.726(r24), G.726(r32)
G.728
G.729, G.729 Annex B
fax relay
Medium complexity G.711ulaw, G.711alaw
G.726(r16), G.726(r24), G.726(r32)
G.729 Annex A, G.729 Annex B with Annex A
fax relay
HCMs support more voice channels than the earlier voice compression modules (VCMs) used in the
Cisco MC3810 series.
Restrictions
The following restrictions apply to HCMs:
• HCMs should not be combined with VCMs in a Cisco MC3810 chassis.
• HCMs require Cisco IOS Release 12.0(7)XK or 12.1(2)T or later.
Related Features and Technologies
Voice over Internet Protocol (VoIP)
Voice over Frame Relay (VoFR)
Voice over Asynchronous Transfer Mode (VoATM)
Related Documents
• Cisco IOS Multiservice Applications Configuration Guide, Cisco IOS Release 12.1
• Cisco IOS Multiservice Applications Command Reference, Cisco IOS Release 12.1
Supported Platforms
• Cisco MC3810 series
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Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
Supported Standards, MIBs, and RFCs
RFCs
• RFC 1890— RTP: A Transport Protocol for Real-Time Applications
• RFC 1889—RTP Profile for Audio and Video Conferences with Minimal Control
MIBs
• CISCO-ENTITY-VENDORTYPE-OID-MIB
• OLD-CISCO-CHASSIS-MIB
• CAS_INTF_MIB
International Telecommunication Union (ITU-T) G-Series Codec Compression Specifications
–
G.711 A Law at 64,000 bps
–
G.711 u Law at 64,000 bps
–
G.723.1 Annex A at 5300 bps
–
G.723.1 Annex A at 6300 bps
Supported Standards, MIBs, and RFCs
Prerequisites
One or two HCM modules must be installed in your Cisco MC3810 chassis.
Note An HCM may not be combined with a VCM in one chassis.
–
G.723.1 at 5300 bps
–
G.723.1 at 6300 bps
–
G.726 at 16,000 bps
–
G.726 at 24,000 bps
–
G.726 at 32,000 bps
–
G.728 at 16,000 bps
–
G.729 at 8000 bps
–
G.729 Annex A and B at 8000 bps
–
G.729 Annex A at 8000 bps
–
G.729 Annex B at 8000 bps
Configuration Tasks
Complete the following tasks to configure the Cisco MC3810 voice ports for operation with one or two
HCMs installed:
• Configuring Codec Complexity
• Specifying Codecs for Network Dial Peers
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Configuration Tasks
Configuring Codec Complexity
To configure codec complexity for voice ports, enter the following commands, beginning in privileged
EXEC mode. Commands apply to both analog and digital voice ports unless otherwise indicated. You
enter the codec complexity command in voice-card configuration mode. On the Cisco MC3810 series,
voice-card 0 is used as a virtual voice-card, and the setting applies to all voice ports on a Cisco MC3810.
This procedure does not cover other voice-port configuration commands that may be required. To learn
more, see the Cisco IOS Multiservice Applications Configuration Guide and the Cisco IOS Multiservice
Applications Command Reference for Cisco IOS Release 12.1.
Command Purpose
Step 1
Step 2
Step 3
Step 4
Step 5
router# show voice dsp
router# configure terminal
router(config)# voice-card 0
router(config-voicecard)# codec
complexity
router(config-voicecard)# exit
{high | medium}
Check the DSP voice channel activity. If any DSP voice channels are in the
busy state, you cannot change the codec complexity.
When all of the DSP channels are in the idle state, continue to step 2.
Enter global configuration mode.
Enter voice-card configuration mode and specify voice card 0. Voice card 0
provides the configuration mode for setting the codec complexity on a
Cisco MC3810.
Specify the codec complexity for this Cisco MC3810 according to the
bandwidth requirements and the number of voice channels to be supported
per DSP. The default is medium complexity, which provides four voice
channels per DSP.
See the “codec complexity” section on page 11 in the Command Reference
for information about the codec complexity command.
Exit from voice-card configuration mode.
Verifying Codec Complexity Settings
To verify the codec complexity configuration, enter the show running-config command to display the
current voice-card setting. If medium complexity is specified, the codec complexity setting is not
displayed. If high complexity is specified, the setting
following example shows an excerpt from the command output if high complexity has been specified:
Router# show running-config
.
.
.
hostname router-alpha
voice-card 0
codec complexity high
.
.
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codec complexity high is displayed. The
Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules
Specifying Codecs for Network Dial Peers
Follow these steps to specify a codec for each network dial peer according to the codec complexity
setting selected for this Cisco MC3810. If you do not set codec complexity and specify a codec, the
defaults remain in effect: medium complexity and G.729, 8000 bps.
This does not cover the complete dial-peer configuration procedure. To learn more, see the Cisco IOS
Multiservice Applications Configuration Guide and the Cisco IOS Multiservice Applications Command
Reference for Cisco IOS Release 12.1.
Command Purpose
Step 1
Step 2
Step 3
Router# configure terminal
Router(config)# dial-peer voice tag {voip | vofr |
voatm}
Router(config-dial-peer)# codec codec [bytes
payload-size
]
Enter global configuration mode.
Enter dial-peer configuration mode and specify a
network dial peer for which to specify a codec.
tag is one or more digits to identify the dial peer. Valid
entries are 1 to 2147483647.
Specify a codec for the dial peer. Codec types are as
follows:
The default is g729r8.
Configuration Tasks
g711alaw, g711ulaw,
g723ar53, g723ar63, g723r53, g723r63,
g726r16, g726r24, g726r32,
g728,
g729abr8, g729ar8, g729br8, g729r8
Step 4
Router(config-dial-peer)# exit
Verifying Network Dial Peers
Follow the procedure below to verify dial-peer configuration. To learn more about these commands, see
the Cisco IOS Multiservice Applications Configuration Guide and the Cisco IOS Multiservice
Applications Command Reference for Cisco IOS Release 12.1.
Enter the privileged EXEC show dial-peer voice command. The following text is sample output from
the show dial-peer voice command for a VoIP dial peer:
Router# show dial-peer voice 10
VoiceOverIpPeer10
information type = voice,
tag = 10, destination-pattern = `555....',
answer-address = `', preference=0,
group = 10, Admin state is up, Operation state is up,
incoming called-number = `', connections/maximum = 0/unlimited,
DTMF Relay = disabled,
application associated:
type = voip, session-target = `ipv4:10.1.1.1',
Optionally specify the voice payload (in bytes) of each
frame.
For information about the options available for the
codec command, see the command reference section or
enter ?.
Exit from dial-peer configuration mode.
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