Cisco 851 - Page 73

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
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



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


High-Density Analog and
Digital Extension Module
for Voice and Fax
With support for up to 24
total voice and fax sessions,
the Cisco High-Density
Extension Module is ideal for
networks with high analog
(foreign exchange station
[FXS], direct inward dialing
[DID], and foreign exchange
ofce [FXO]) and digital
(Basic Rate Interface [BRI])
call-capacity requirements
Components: Baseboard
with eight ports that can be
congured individually for
FXS or DID signaling Add up
to two expansion modules in
any combination to increase
voice and fax session
capacity: EM-HDA-8FXS,
EM-4BRI-NT/TE,
EM-HDA-6FXO, EM-HDA-
3FXS/4FXO Packet
voice DSP modules
(PVDM2s) are used in
combination with the Cisco
High-Density Extension
Module baseboard and
its expansion modules
PVDM2s are purchased
separately and installed in
the digital signal processor
(DSP) module slots located
inside the Cisco 2821, Cisco
2851, Cisco 3825, and Cisco
3845 Integrated Services
Routers

Voice and Fax Integration
Extension Voice Module
(EVM) slot only:
2821–123(8)T4
2851–123(8)T4
Any Network Module Slot:
3825 (1 per router)–
123(11)T
3845 (1 or 2 per router)–
123(11)T
Requires a Cisco IOS voice
feature set

Four-port Voice and Fax
Expansion Module
Adds support for BRI
(NT and TE) for use with
the Cisco High-Density
Extension Module (EVM-
HD-8FXS/DID) baseboard
This module allows
connection to an ISDN
S/T network by replicating
either the network side
or the terminal side This
module provides four
on-premises S/T BRI trunk
connections to the ISDN
PBX

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

High-density Analog Voice/
Fax Network Module with
4 FXS
This base board is always
required for any congu-
ration of NM-HDA It comes
with four built-in FXS ports
Onboard DSP resources
can service eight voice
calls using high-complexity
codecs: G711 a/u; G726
at 32k, 24k and 16k; G728;
G729, A, B, AB; G7231 at
53k and 63k; clear channel
codec, fax relay Also
supports 16 voice calls
using medium-complexity
codecs: G711 a/u, G726 at
32k, 24k, and 16k; G729A
and AB; clear channel
codec, fax relay Supports
two expansion modules
and one DSP module

Voice and Fax Integration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T4
Prior to Cisco IOS 123
Mainline, requires a Cisco
IOS “Plus” feature set
123 Mainline and forward
supported in IP Voice
feature set
No reliance on other
network modules, WICs,
voice interface cards,
or advanced integration
modules
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
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




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


Two-slot IP Communications
Enhanced Voice/Fax
Network Module
Provides a two-slot
voice/fax network module
with an integrated digital
signal processor (DSP),
enabling voice and fax
trafc to be routed over
data networks The user-
congurable expansion
slot accommodate the
addition of up to four Cisco
voice interface cards
or voice/WAN interface
cards The interface cards
allow up to eight analog
ports, four BRI ports, 24
medium complexity, or
48 G711 digital T1/E1
voice channels Connects
to standard telephony
equipment such as PBXs,
key systems, phones, and
fax machines

Voice and Fax Integration
3800 Series–123(11)T
2811, 2821, and 2851–
123(8)T4
Requires voice interface
card and voice feature set
The VWIC2-1MFT-G703
and VWIC2-2MFT-G703
are not supported on the
NM-HD-2VE
Cisco Network Modules