Cisco 851 - Page 74

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












Four-port Voice/Fax
Expansion Module – FXO
Provides four off-premise
analog connections to the
central ofce Country
settings are congurable
Includes support for
battery polarity reversal
detection and Caller ID

Voice and Fax Integration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T4
Requires Cisco IP voice
feature set and higher
Requires a high-density
analog voice/fax network
module (NM-HDA-4FXS)

Eight-port Voice/Fax
Expansion Module – FXS
Provides an additional
eight FXS ports for
connections directly
to analog phones, fax
machines, and key

Voice and Fax Integration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T4
123 Mainline and forward
supported in IP Voice
feature set
Requires a high-density
analog voice/fax network
module (NM-HDA-4FXS)
or a Cisco high-density
analog and digital
extension module
(EVM-HD-8FXS/DID)

16-channel DSP Module
for NM-HDA
Enables an additional eight
high-complexity or 16
medium-complexity voice
calls on NM-HDA

Voice and Fax Integration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T4
123 Mainline and forward
supported in IP Voice
feature set
Requires a high-density
analog voice/fax network
module (NM-HDA-4FXS)

Four-port Voice/Fax
Expansion Module – FXO
Provides four off-premise
analog connections to the
central ofce Country
settings are congurable
Includes support for
battery polarity reversal
detection and Caller ID
Compared to the EM-HDA-
4FXO, this module delivers
longer loop length support
and improved performance
against poor line conditions
when used in GroundStart
signaling mode

Voice and Fax Integration
3800 Series–123(14)T
2811, 2821, and 2851–
123(14)T
Requires Cisco IP voice
feature set and higher
Requires a high-density
analog voice/fax network
module (NM-HDA-4FXS)
Cisco Network Modules













Three-port FXS and
Four-port FXO Voice and
Fax Expansion Modules
Provides on-premises
FXS signaling to connect
directly to a standard
telephone, fax machine, or
similar device and supplies
ring, voltage, and dial tone
In addition, the FXO ports
provide off-premises
connection to the central
ofce Use with the Cisco
High-Density Extension
Module (EVM-HD-8FXS/
DID) baseboard

Voice and Fax Integration
3800 Series–123(11)T
2851–123(8)T4
2821–123(8)T4
Requires a Cisco high-
density analog and digital
extension module
(EVM-HD-8FXS/DID)
Requires voice feature set

Six-port FXO Voice and Fax
Expansion Module
Provides off-premises
connection to the central
ofce This module
supports FXO power
failover If power to the
router fails, this feature
helps enable a direct
metallic path between an
FXO port and a special
“red” telephone to provide
a direct line to the PSTN
Use with the Cisco High-
Density Extension Module
(EVM-HD-8FXS/DID)
baseboard

Voice and Fax Integration
3800 Series–123(11)T
2851–123(8)T4
2821–123(8)T4
Requires a Cisco high-
density analog and digital
extension module
(EVM-HD-8FXS/DID)
Requires voice feature set
Cisco Network Modules