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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
Type
HCM2
HCM6
Voice Compression Module Application Information
Codec Packaging Complexity (see Table 2)
High complexity (codec complexity set to high)
Medium complexity (codec complexity set to medium)
High complexity (codec complexity set to high)
Medium complexity (codec complexity set to medium)
Voice Channels
per HCM
4
8
12
24
Cisco IOS Release 12.1(2)T
1
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Page 1: Table Of Contents
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). -
Page 2: Related Documents
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. •... -
Page 3: Supported Standards, Mibs, And Rfcs
One or two HCM modules must be installed in your Cisco MC3810 chassis. An HCM may not be combined with a VCM in one chassis. Note Configuration Tasks Complete the following tasks to configure the Cisco MC3810 voice ports for operation with one or two HCMs installed: Configuring Codec Complexity •... - Page 4 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.
- Page 5 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.
- Page 6 Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules Configuration Tasks technology prefix: ip precedence = 0, UDP checksum = disabled, session-protocol = cisco, req-qos = best-effort, acc-qos = best-effort, fax-rate = voice, payload size = 20 bytes codec = g711alaw,...
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Page 7: Command Reference
Last Setup Time = 0. Command Reference This section documents new or modified commands. Modified commands are indicated by an asterisk (*). All other commands used with this feature are documented in the Cisco IOS Release 12.1 command reference publications. codec (dial-peer)* •... - Page 8 Use the no form of this command to restore the default value. codec codec [bytes payload-size] no codec codec Codec options on Cisco MC3810 series equipped with HCM, and with codec Syntax Description complexity set to high or medium: g711alaw—G.711 A Law, 64000 bps •...
- Page 9 Release Modification Command History 11.3(1)T This command was introduced as a Cisco 3600 series VoIP dial-peer configuration command. 12.0(4)T This command was modified for VoFR dial peers. On the Cisco MC3810 series, this command was first supported as a dial-peer command.
- Page 10 Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules codec (dial-peer) Table 3 Voice Payload-per-Frame Options and Defaults Default Voice Codec Protocol Voice Payload Options (bytes) Payload (bytes) g726r32 VoIP 40 to 200 in multiples of 40 VoFR 20 to 240 in multiples of 20...
- Page 11 (DSPs). With higher codec complexity, fewer calls can be handled. Note In the Cisco MC3810 series, this command is valid only with HCM(s) installed, and you must specify voice card 0 in the command mode. If two HCMs are installed, the codec complexity command configures both HCMs at once.
- Page 12 The following example sets the codec complexity to high on a Cisco MC3810 containing one or two HCMs: router(config)# voice-card 0 router(config-voicecard)# codec complexity high The following example sets the codec complexity to high on voice card 1 in a Cisco 2600 or 3600 series router: router(config)# voice-card 1 router(config-voicecard)# codec complexity high...
- Page 13 Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules ds0-group ds0-group To specify the DS0 timeslots that make up a logical voice port on a T1 or E1 controller, and to specify the signaling type, enter the ds0-group controller configuration command. Use the no form of the command to remove the DS0 group and signaling setting.
- Page 14 The ds0-group command automatically creates a logical voice port that is numbered as follows on the Cisco MC3810 series: slot:ds0-group-number. On the Cisco MC3810 series, the slot number is the controller number. Although only one voice port is created for each DS0 group, applicable calls are routed to any channel in the group.
- Page 15 Configuring Cisco MC3810 Series Concentrators to Use High-Performance Compression Modules ds0-group Examples The following example configures DS0 groups 0 and 1 with different CAS signaling on controller T1 0: router(config)# controller T1 0 router(config-controller)# mode cas router(config-controller)# framing esf router(config-controller)# linecode b8zs...
- Page 16 You can configure codec complexity only in voice-card configuration mode. On the Cisco 2600 and 3600 series, the slot corresponds to the physical slot in the chassis. On the Cisco MC3810 series, the slot is always 0, and all changes made in voice-card mode apply to the entire Cisco MC3810. On Cisco MC3810 series concentrators, this command is available only if the chassis is equipped with one or two HCMs.