Cisco Cisco 2600 3600 Series 1-Port 30-Channel J1 Voice Fax Network Module Data Sheet
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DATA SHEET
CISCO MULTIFLEX TRUNK DEDICATED ECHO
CANCELLATION MODULES
CANCELLATION MODULES
Cisco
®
Multiflex Trunk Dedicated Echo Cancellation (MFT ECAN) Modules are dedicated resources for the Cisco Enhanced
ITU-T G.168 ECAN feature, providing robust echo cancellation performance for demanding network environments. The
modules are daughter cards that attach to Cisco Second-generation Multiflex Trunk Voice/WAN Interface Cards (MFT VWIC2
cards). The dedicated ECAN modules are available in 32- and 64-channel configurations, which match the requirements of
the 1- and 2-port T1/E1 MFT VWIC2s, respectively. The 64-channel MFT ECAN Module is shown in Figure 1. Figure 2 shows
the module attached to a 2 port T1/E1 MFT VWIC2.
Figure 1. Cisco 64 Channel Multiflex Trunk Dedicated Echo Cancellation Module
Figure 2. Cisco 2-Port T1/E1 MFT VWIC2 with 64-Channel MFT Dedicated ECAN Module
The Cisco Enhanced ITU-T G.168 ECAN feature can be run either on the dedicated ECAN modules or the general voice resources that reside on
the platform, network module, or advanced integration module. For example, Cisco 2800 Series and 3800 Series integrated services routers can use
either the packet voice DSP modules (PVDM2s) mounted in the router chassis or the digital signal processor (DSP) resources on network modules to
run the G.168 ECAN feature. When the G.168 ECAN feature is run on general voice resources, processing and memory constraints limit it to having
at most 64-ms echo tail coverage. Although this is adequate in most network conditions, a larger echo tail coverage is sometimes required. In these
situations, the dedicated ECAN modules, attached to the appropriate MFT VWIC2, can be used. The processing and memory resources of the
dedicated ECAN modules enable the echo canceller to be configured with predefined settings and an extended 128-ms echo tail buffer, providing
robust echo cancellation performance in these more demanding network environments.