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Cisco High-Density Analog Voice and Fax Network Module
Feature Overview
Feature Overview
The Cisco High-Density Analog Voice and Fax Network Module provides DTMF detection, voice
compression and decompression, call progress tone generation, voice activity detection (VAD), echo
cancellation, and adaptive jitter buffering for up to 16 ports.
The following port combinations are supported:
•
Twelve Foreign Exchange Station (FXS) ports
•
Eight Foreign Exchange Office (FXO) ports and four FXS ports
•
Twelve FXS and four FXO ports
•
Four Foreign Exchange Station (FXS) ports
The base card supports four FXS ports. The addition of an eight-port FXS expansion module can
increase the capacity to twelve FXS ports. The addition of two four-port FXO expansion modules can
increase the capacity to eight- FXO ports and four-FXS ports. The addition of one each of the FXS and
FXO expansion modules can increase the capacity to twelve FXS ports and four- FXO ports. The FXO
expansion module supports a power failure port which connects directly to the central office (CO) in case
of failure.
The digital signal processors (DSPs) on the network module support up to eight-ports of
high-complexity codecs or up to sixteen ports of medium-complexity and low-complexity codecs. The
number of DSPs must be increased if more than eight ports of high-complexity codecs are needed. In
this case, a DSP expansion module must be installed.
Table 1 shows analog voice port numbering, which differs for each of the voice-enabled routers. More
current information may be available in the release notes that accompany the Cisco IOS software you
are using.
Table 1
Caution
Base Module
Telephony Signaling
Interface
Voice Port Numbers
NM-HDA-4FXS
FXS
0 to 3
EM0
FXO
4 to 7
EM0
FXS
4 to 11
EM1
FXO
14 to 17
EM1
FXS
14 to 21
No more than a total of 12 FXS ports can be configured at one time.
Cisco IOS Release 12.2(2)XT and 12.2(8)T
2
High-Density Analog Voice Port Numbering