Cisco 3825 Hardware Installation Guide - Page 210
Physical Port, Location, FXS Ports
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High-Density Analog Telephony Network Module Chapter 16 Connecting High-Density Analog Telephony Network Modules 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 and EM3-HDA-8FXS expansion modules) • 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-8FXS, EM3-HDA-8FXS, and 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. Table 16-2 Physical Ports on the High-Density Analog Telephony Network Module Physical Port 1-4 5-14 15-24 25 Location Default on card Expansion module 0 Expansion module 1 Not used FXS Ports 1-4 5-12 FXS 13-14 Not used 15-22 FXS 23-24 Not used - 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 Note Port 18 is hard-wired to port 24. - Tip To maintain an emergency connection during power outages, connect port 14 or port 24 to the public 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 Figure 16-1. 16-2 Cisco Network Modules Hardware Installation Guide OL-2485-20