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Cisco Voice Modules and Interface Cards

Cisco Multiflex Trunk Dedicated Echo Cancellation Modules

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Q&A

GENERAL

Q. What new Cisco ® modules are being announced?
A. Two Cisco Multiflex Trunk Dedicated Echo Cancellation (MFT ECAN) Modules are being announced, as described in Table 1.

Table 1. New Cisco MFT Dedicated ECAN Modules

Product Number

Description

EC-MFT-32

32-Channel Multiflex Trunk Dedicated ECAN Module

EC-MFT-64

64-Channel Multiflex Trunk Dedicated ECAN Module

Q. What voice/WAN interface cards (VWICs) contain a slot for the modules? What modules are generally used for each card?
A. The Cisco Second-generation 1- and 2-port T1/E1 Multiflex Trunk VWIC2s (MFT VWIC2s) contain slots for the dedicated ECAN modules. The MFT VWIC2s and the recommended ECAN modules are listed in Table 2.

Table 2. Recommended ECAN Modules

Product Number

Product Description

Recommended ECAN Module

VWIC2-1MFT-T1/E1

1-Port T1/E1 Multiflex Trunk Voice/WAN Interface Card
EC-MFT-32

VWIC2-2MFT-T1/E1

2-Port T1/E1 Multiflex Trunk Voice/WAN Interface Card
EC-MFT-64

VWIC2-1MFT-G703

1-Port G.703 Multiflex Trunk Voice/WAN Interface Card
EC-MFT-32

VWIC2-2MFT-G703

2-Port G.703 Multiflex Trunk Voice/WAN Interface Card
EC-MFT-64

Note:

• It is possible to install a Cisco 32-Channel MFT Dedicated ECAN Module on a 2-port MFT VWIC2. However, not all voice channels will be able to concurrently use the echo cancellation feature.

• It is possible to install a Cisco 64-Channel MFT Dedicated ECAN Module on a 1-port MFT VWIC2. However, the extra echo cancellation channels will not be used. The only ports on the MFT VWIC2 that can use the module resources are the ports directly attached to the module.

Q. What echo cancellation solution is recommended for demanding network environments where a 64 ms echo canceller coverage may not be sufficient?
A. The ECAN modules provide a dedicated hardware resource that runs the Cisco Enhanced ITU-T G.168 ECAN feature with a tail length of up to 128 ms with other optional settings set through the CLI. These optional daughter cards attach to the second-generation T1/E1 MFT VWIC2s to provide robust echo cancellation performance for demanding network environments.
Q. What is the difference between the echo canceller software feature that is run on the dedicated ECAN modules and the other DSP resources on the Packet Voice DSP Modules (PVDMs), network modules, or advanced integration modules?
A. The PVDM2s, other voice (digital signal processor [DSP]) resources mounted directly on the access router main board or directly on a network module or advanced integration module, and the dedicated ECAN modules all support the Cisco enhanced ITU-T G.168 ECAN feature. However, only the dedicated ECAN modules can support the feature with the echo canceller coverage set to 128 ms. On the other platforms, the echo canceller coverage is limited to 64 ms.
Q. What version of Cisco IOS ® Software is required for supporting the dedicated ECAN modules? What are the Cisco IOS Software license requirements?
A. The dedicated ECAN modules running the Cisco Enhanced ITU-T G.168 ECAN feature are supported starting in Cisco IOS Software Release 12.3(14)T and will be first available in the Cisco IOS Software 12.4(1) mainline release. Data applications require at minimum the IP Base feature set license, and voice applications require at minimum the IP Voice feature set license.
Q. How can one find out if dedicated ECAN modules can benefit a particular voice-over-IP (VoIP) network?
A. There are a few ways to help determine whether a dedicated ECAN module will help. First, there will likely be echo only on a subset of the calls, because other calls will be handled by the 64 ms echo canceller coverage. These calls will likely be long-distance calls or calls to a small set of numbers. Additionally, the echo should be relatively the same, independent of whether the echo cancellation feature is enabled or disabled.
Q. Where can I find out more information about echo cancellers and how they are tuned?
A. The "Echo Analysis for Voice over IP" white paper provides a comprehensive overview of echo; echo cancellation components, operation, and operation verification; and case studies. It can be found at http://www.cisco.com/en/US/tech/tk652/tk701/technologies_white_paper09186a00800d6b68.shtml.
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Addresses, phone numbers, and fax numbers are listed onthe Cisco Website at www.cisco.com/go/offices.Argentina · Australia · Austria · Belgium · Brazil · Bulgaria · Canada · Chile · China PRC · Colombia · Costa Rica · Croatia · Cyprus Czech Republic · Denmark · Dubai, UAE · Finland · France · Germany · Greece · Hong Kong SAR · Hungary · India · Indonesia · Ireland · Israel Italy · Japan · Korea · Luxembourg · Malaysia · Mexico · The Netherlands · New Zealand · Norway · Peru · Philippines · Poland · Portugal Puerto Rico · Romania · Russia · Saudi Arabia · Scotland · Singapore · Slovakia · Slovenia · South Africa · Spain · Sweden · Switzerland · Taiwan Thailand · Turkey · Ukraine · United Kingdom · United States · Venezuela · Vietnam · ZimbabweCopyright  2005 Cisco Systems, Inc. All rights reserved. CCSP, CCVP, the Cisco Square Bridge logo, Follow Me Browsing, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and iQuick Study are service marks of Cisco Systems, Inc.; and Access Registrar, Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GigaDrive, GigaStack, HomeLink, Internet Quotient, IOS, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, LightStream, Linksys, MeetingPlace, MGX, the Networkers logo, Networking Academy, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, ProConnect, RateMUX, ScriptShare, SlideCast, SMARTnet, StrataView Plus, TeleRouter, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0502R)	205276.r_ETMG_JR_4.05Printed in the USA Text Box:  Corporate HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:	408 526-4000	800 553-NETS (6387)Fax:	408 526-4100	European HeadquartersCisco Systems International BVHaarlerbergparkHaarlerbergweg 13-191101 CH AmsterdamThe Netherlandswww-europe.cisco.comTel:	31 0 20 357 1000Fax:	31 0 20 357 1100	Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAwww.cisco.comTel:	408 526-7660Fax:	408 527-0883	Asia Pacific HeadquartersCisco Systems, Inc.168 Robinson Road#28-01 Capital TowerSingapore 068912www.cisco.comTel: +65 6317 7777Fax: +65 6317 7799Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed onthe Cisco Website at www.cisco.com/go/offices.Argentina · Australia · Austria · Belgium · Brazil · Bulgaria · Canada · Chile · China PRC · Colombia · Costa Rica · Croatia · Cyprus Czech Republic · Denmark · Dubai, UAE · Finland · France · Germany · Greece · Hong Kong SAR · Hungary · India · Indonesia · Ireland · Israel Italy · Japan · Korea · Luxembourg · Malaysia · Mexico · The Netherlands · New Zealand · Norway · Peru · Philippines · Poland · Portugal Puerto Rico · Romania · Russia · Saudi Arabia · Scotland · Singapore · Slovakia · Slovenia · South Africa · Spain · Sweden · Switzerland · Taiwan Thailand · Turkey · Ukraine · United Kingdom · United States · Venezuela · Vietnam · ZimbabweCopyright  2005 Cisco Systems, Inc. All rights reserved. CCSP, CCVP, the Cisco Square Bridge logo, Follow Me Browsing, and StackWise are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, and iQuick Study are service marks of Cisco Systems, Inc.; and Access Registrar, Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherFast, EtherSwitch, Fast Step, FormShare, GigaDrive, GigaStack, HomeLink, Internet Quotient, IOS, IP/TV, iQ Expertise, the iQ logo, iQ Net Readiness Scorecard, LightStream, Linksys, MeetingPlace, MGX, the Networkers logo, Networking Academy, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, ProConnect, RateMUX, ScriptShare, SlideCast, SMARTnet, StrataView Plus, TeleRouter, The Fastest Way to Increase Your Internet Quotient, and TransPath are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.All other trademarks mentioned in this document or Website are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0502R)	205276.r_ETMG_JR_4.05Printed in the USA