Cisco CISCO2650 - 2650 Router Hardware Installation Manual page 210

High-Density Analog Telephony Network Module
1. FXO = Foreign Exchange Office
These expansion modules can be used in the following combinations:
12 Foreign Exchange Station (FXS) ports (NM-HDA with installed EM-HDA-8FXS
•
EM3-HDA-8FXS
Ten Foreign Exchange Office (FXO) ports and four FXS ports (NM-HDA with two installed
•
EM-HDA-4FXO or EM2-HDA-4FXO expansion modules)
12 FXS and 4 FXO ports (NM-HDA with installed
•
EM-HDA-4FXO or EM2-HDA-4FXO expansion modules)
The FXO expansion module supports a power failure port that connects directly to the central office
(CO) in case of failure. Physical ports are added as shown in
Table 16-2 Physical Ports on the High-Density Analog Telephony Network Module
Physical Port
1–4
5–14
15–24
25
To maintain an emergency connection during power outages, connect port 14 or port 24 to the public
Tip
switched telephone network (PSTN). Phones connected to port 8 or port 18 fail over to the PSTN
connections through port 14 or port 24 during power outages.
The digital signal processors (DSPs) on the card support up to 8 ports of high-complexity codecs or up
to 16 ports of medium- 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.
The high-density analog telephony network module is connected to the network using an RJ-21
Amphenol connector on the front panel. The front of the card is shown in
Cisco Network Modules Hardware Installation Guide
16-2
Chapter 16
expansion modules)
Location FXS Ports
Default on card 1–4
Expansion module 0 5–12 FXS
13–14 Not used
Expansion module 1 15–22 FXS
23–24 Not used
Not used —
Connecting High-Density Analog Telephony Network Modules
EM-HDA-8FXS, EM3-HDA-8FXS,
Table 16-2.
FXO Ports
—
5–8 FXO
9–13 Not used
14 Power failure port
Note Port 8 is hard-wired to port 14.
15–18 FXO
19–23 Not used
24 Power fail port
Port 18 is hard-wired to port 24.
Note
—
Figure
and
and
16-1.
OL-2485-20