Chapter 28
Connecting Cisco High-Density Extension Modules
Expansion Modules for Cisco High-Density Extension Modules
The Cisco high-density extension module supports up to two expansion modules (EMs) in the
configurations shown in
Table 28-1 Example Hardware Configurations Supported on Cisco High-Density Extension Modules (EVM-HD-8FXS/DID)
Base Board
(FXS or DID)
EM0
EVM-HD-8FXS/
—
DID
EM-HDA-8FXS
EM-HDA-8FXS
EM-HDA-8FXS
EM-HDA-8FXS
EM-HDA-8FXS
EM-HDA-3FXS/4FXO
EM-HDA-3FXS/4FXO
EM-HDA-3FXS/4FXO
EM-HDA-3FXS/4FXO
EM-HDA-6FXO
EM-HDA-6FXO
EM-HDA-6FXO
EM-4BRI-NT/TE
EM-4BRI-NT/TE
The 4-port digital voice/fax expansion module (EM-4BRI-NT/TE) operates as an S/T interface and is
capable of NT or TE functionality. In NT mode, the expansion module can supply in-line power for the
far end of the connection.
The 7-port analog voice/fax expansion module (EM-HDA-3FXS/4FXO) provides three additional FXS
ports and four FXO ports for off-premises analog voice applications.
The 6-port analog voice/fax expansion module (EM-HDA-6FXO) provides six FXO ports for
off-premises analog voice applications. The sixth port (port 5) provides a trunk bypass (TBP) or power
failover capability.
The 8-port analog voice/fax expansion module (EM-HDA-8FXS) adds an additional eight FXS ports to
the Cisco high-density extension module.
When router power is off, connect an analog phone to the FXO line to make a call. (See the
Tip
Cisco High-Density Extension Modules to the Network" section on page 28-6
OL-2485-20
Cisco High-Density Analog and Digital Extension Module for Voice and Fax
Table
28-1.
Total Ports
FXS or
EM1
DID
—
8
8
—
EM-HDA-8FXS
8
EM-HDA-3FXS/4FXO
8
EM-HDA-6FXO
8
EM-4BRI-NT/TE
8
—
8
EM-HDA-3FXS/4FXO
8
EM-HDA-6FXO
8
EM-4BRI-NT/TE
8
—
8
EM-HDA-6FXO
8
EM-4BRI-NT/TE
8
—
8
EM-4BRI-NT/TE
8
BRI
FXS
FXO
Ports
—
—
—
8
—
—
16
—
—
11
4
—
8
6
—
8
—
4
3
4
—
6
8
—
3
10
—
3
4
4
6
—
—
12
—
—
6
4
—
—
—
4
—
—
8
Cisco Network Modules Hardware Installation Guide
Total
B-
Voice
channel
Sessions
—
8
—
16
—
24
—
23
—
22
8
24
—
15
—
22
—
21
8
23
14
—
20
—
8
22
8
16
16
24
"Connecting
for more information).
28-3