Guest

Cisco Network Modules

High-Density Analog Telephony Network Modules

  • Viewing Options

  • PDF (240.2 KB)
  • Feedback
Connecting Cisco High-Density Analog Telephony Network Modules to the Network

Table Of Contents

Connecting Cisco High-Density Analog Telephony Network Modules to the Network

High-Density Analog Telephony Network Module

Connecting the High-Density Analog Telephony Network Module to the Network

Adding DSP Expansion Modules

Adding Port Expansion Modules

High-Density Analog Telephony Network Module LEDs

High-Density Analog Voice Card Pinouts

Related Documents

Obtaining Documentation, Obtaining Support, and Security Guidelines


Connecting Cisco High-Density Analog Telephony Network Modules to the Network


Revised: October 21, 2009, OL-12820-01

This guide describes how to connect Cisco high-density analog telephony network modules to your network. It contains the following sections:

High-Density Analog Telephony Network Module

Connecting the High-Density Analog Telephony Network Module to the Network

Adding DSP Expansion Modules

Adding Port Expansion Modules

High-Density Analog Telephony Network Module LEDs

High-Density Analog Voice Card Pinouts

Related Documents

Obtaining Documentation, Obtaining Support, and Security Guidelines

High-Density Analog Telephony Network Module

The high-density analog telephony network module is a modular, high-density voice network module that provides dual tone multifrequency (DTMF) detection, voice compression and decompression, call progress tone generation, voice activity detection (VAD), echo cancellation, and adaptive jitter buffering.

The high-density analog telephony network module supports two different expansion modules, providing up to 12 ports in addition to the 4 Foreign Exchange Service (FXS) ports on the base high-density analog telephony network module (NM-HDA). See Table 1 for expansion module support information.

Table 1 Expansion Modules Supported on the Cisco High-Density Analog Telephony Network Module (NM-HDA)

Expansion Modules
Port Type
Number of Ports

EM-HDA-8FXS

FXS

8

EM3-HDA-8FXS

FXS

8

EM-HDA-4FXO

FXO1

4

EM2-HDA-4FXO

FXO

4

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)

Eight 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 four 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 2.

Table 2 Physical Port Locations

Physical Port
Location
FXS Ports
FXO Ports

1-4

Default on card

1-4

5-14

Expansion module 0

5-12 FXS
13-14 Not used

5-8 FXO
9-13 Not used
14 Power failure port

Note Port 8 is hard-wired to port 14.

15-24

Expansion module 1

15-22 FXS
23-24 Not used

15-18 FXO
19-23 Not used
24 Power fail port

Note Port 18 is hard-wired to port 24.

25

Not used



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.



Note If you have specified the use of a private line automatic ringdown (PLAR) off-premises extension (OPX) connection mode for an FXO voice port (with loop resistance less than 8000 Ohm), you must ensure that the soft-offhook option is enabled on the port.

This option allows a stepped offhook resistance during seizure which avoids overloading the circuit during offhook in the event that ringing voltage is present on the circuit at the same time as the trunk seizure. The stepped offhook resistance is initially set to 800 Ohms, then adjusts to 50 Ohms when ringing voltage is not present.

To enable soft-offhook command on the port, and to access the connection command with plar opx syntax, see the Cisco Command Lookup Tool.


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 1.

Figure 1 High-Density Analog Telephony Network Module

Connecting the High-Density Analog Telephony Network Module to the Network

The high-density analog telephony network module is connected to a distribution frame with an RJ-21 cable. (See Figure 2.) RJ-21 cables are not provided with the network module. Some recommended cables are as follows:

253PP10GYADI male-to-male cable and 253PC10GYADI male-to-female cable from Gray Bar

AT125-SM patch panel (supports both male and female connection) from Gray Bar

For ordering information, see the "Obtaining Documentation, Obtaining Support, and Security Guidelines" section.

Figure 2 High-Density Analog Telephony Card Connected to a Main Distribution Frame

Adding DSP Expansion Modules

DSP expansion modules can be used if more than eight ports using high-complexity codecs are needed on the high-density analog telephony network module.

To install DSP expansion modules, follow these steps:


Step 1 Insert the connector on the DSP expansion module into the module connector on the network module. (See Figure 3.)


Note Be sure to press firmly on the DSP expansion module until the board seats onto the connector.


Step 2 Insert the screws from the hardware kit through the DSP expansion module into the brackets on the network module.

Step 3 Install the network module into the router, as described in the "Installing Cisco Network Modules in Cisco Access Routers" section on page 5.

Figure 3 Installing a DSP Expansion Module


Adding Port Expansion Modules

Port expansion modules can be used to increase the number of ports supported on the high-density analog telephony network module.

To install port expansion modules, follow these steps:


Step 1 Decide if the expansion board is going in the EM0 slot or EM1 slot, as shown in Figure 4.

Step 2 Insert the connector on the port expansion module into the module connector on the network module, as shown in Figure 4. Use the alignment pins on the bracket to correctly align the expansion module. If the pin does not properly align with the expansion module, the rear bracket can be adjusted by loosening the screw underneath the bracket and tightening it when the module is correctly in place.


Note Be sure to press firmly on the port expansion module until the board seats securely on the connector.



Caution For each expansion module, two mounting screws must be installed with 6-8 lbs-in (67.8 N-cm) of torque. Failure to properly secure the expansion module to the base module with two screws compromises product reliability. In the case of FXO ports, failure to properly tighten both mounting screws causes FXO ground-start outgoing call operation to fail.

Step 3 Insert the screws from the hardware kit through the port expansion module into the brackets on the network module.


Warning Failure to secure the expansion module to the base module with two screws defeats the earth ground, causing a potential safety hazard. Statement 347


Figure 4 Installing a Port Expansion Module

Step 4 Apply the appropriate label on the front of the card, as shown in Figure 5.

Step 5 Install the network module into the router, as described in the "Installing Cisco Network Modules in Cisco Access Routers" section on page 5.

Figure 5 Label Locations for Expansion Ports


High-Density Analog Telephony Network Module LEDs

Figure 6 shows high-density analog telephony network module LEDs. Table 3 describes their meaning.

Figure 6 High-Density Analog Telephony Network Module LEDs

Table 3 High-Density Analog Telephony Network Module LEDs

LED
Meaning

EN

Green indicates that the module has passed its self-tests and is available to the router.

ACT

Green indicates that the module is ready to process data. It goes on when the boot process is complete and stays on during normal operation.


High-Density Analog Voice Card Pinouts

Figure 7 shows the RJ-21 connector wiring for the cable used for the high-density analog voice card; Table 4 lists the pinouts. The port usage depends on the type of expansion cards installed.

Figure 7 RJ-21 Connector Wiring

Table 4 RJ-21 Connections for the High-Density Analog Voice Network Module 

RJ-21 Connector
NM-HDA Port
Network Module Reference
Pair
Tip Conductor
Ring Conductor

1

26

1

0

FXS

Base card

2

27

2

1

FXS

3

28

3

2

FXS

4

29

4

3

FXS

5

30

5

4

FXS

FXO

Expansion board in slot 0

6

31

6

5

FXS

FXO

7

32

7

6

FXS

FXO

8

33

8

7

FXS

FXO

9

34

9

8

FXS

Unused

10

35

10

9

FXS

Unused

11

36

11

10

FXS

Unused

12

37

12

11

FXS

Unused

13

38

13

12

Unused

Unused

14

39

14

13

Unused

FXO failover

15

40

15

14

FXS

FXO

Expansion board in slot 1

16

41

16

15

FXS

FXO

17

42

17

16

FXS

FXO

18

43

18

17

FXS

FXO

19

44

19

18

FXS

Unused

20

45

20

19

FXS

Unused

21

46

21

20

FXS

Unused

22

47

22

21

FXS

Unused

23

48

23

22

Unused

Unused

24

49

24

23

Unused

FXO failover

25

50

25

Unused


Related Documents

For additional information, see the following documents and resources.

Related Topic
Document Title

Regulatory compliance and safety information

Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information
http://www.cisco.com/en/US/docs/routers/access/interfaces/rcsi/IOHrcsi.html

Cisco IOS software website and reference documentation

Cisco IOS Software http://www.cisco.com/web/psa/products/index.html?c=268438303


Obtaining Documentation, Obtaining Support, and Security Guidelines

For information on obtaining documentation, obtaining support, providing documentation feedback, security guidelines, and also recommended aliases and general Cisco documents, see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:

http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html