Double-Density Modem Card

The Cisco AS5800 universal access server uses the Cisco Modem ISDN Channel Aggregation (MICA) double-density modem module cards (DMMs) to convert analog pulse-code modulation (PCM) bitstreams to digital data.

This chapter discusses the use of the double-density modem card in the Cisco 5814 dial shelf, the LEDs on the front of the card, the firmware that is used, and also includes steps for configuring your software and verifying and troubleshooting your DMM installation.

DMM Card Overview

The Cisco AS5800 accommodates a maximum of ten DMM cards that use Cisco's MICA technology with upgradable firmware. Each DMM card plugs directly into the dial shelf backplane and has no external connections. Each DMM card has five LEDs, which indicate modem card status.

The Cisco AS5800 is capable of terminating as many as 1,344 modem connections when equipped with ten DMM cards and two CT3 trunk cards.

Each double-density modem card contains 12 DMM SIMMS. Each DMM SIMM contains 12 digital modems.

DMMs perform the modulation and demodulation of the analog bitstreams. Each DMM comprises 12 digital modems. There are 12 DMMs on each DMM modem card; thus, each card can support a maximum of 144 modems.

DMM cards can be installed in slots numbered 0 to 11 on the dial shelf backplane. However, we recommend that you install modem cards in dial shelf slots 2 to 11 and reserve slots 0 and 1 for trunk cards. (Trunk cards are required for call termination and can only operate in slots 0 to 5.)

Figure 4-2 shows a fully-configured Cisco 5814 dial shelf with ten modem cards installed.

LED Indicators

During normal operation, all five LEDs light when the system is powered ON and the DMM cards are ready. When the modem card CPU software image starts running, it shuts off all LEDs except the power LED. DMM card LEDs are listed in Table 4-1.

Table 4-1 DMM Card LED Descriptions

LED	Color	Description
PWR (Power)	Green	Lights when card is powered ON.
Maint (Maintenance)	Yellow	Lights when there are no active calls on the card and you have completed a card-level software busyout. This indicates that the card is ready to be removed.
HCPU (Host CPU)	Green	Lights when the DMM card passes diagnostics and the modem card CPU is operating properly.
Modems	Green	Lights when all modem modules have passed diagnostics and are operating properly. Remains OFF if one or more modem modules are missing from the card or if one or more modems fails diagnostics.
Calls	Green	Lights when at least one active call is switched through the modem card.

Modem Firmware

Modem card software is automatically downloaded to a modem card from the router shelf when you boot the system for the first time, or when you insert a modem card while the system is operating. If you insert modem cards while the system is operating, the system software recognizes the cards and the router shelf downloads the required portware to the cards.

The modem firmware image (also known as portware) is bundled with the Cisco IOS modem card image. The firmware image uses an auto-detect mechanism, which enables the modem to service multiple modem call types. A modem detects the call type and automatically configures itself for that operation.

The DMM modems can be programmed to collect ANI (calling number) and DNIS (called number) digits for caller identification information when the trunk cards are configured in channel-associated signaling (CAS) mode. The modem passes the ANI/DNIS information to the DMM card software using a portware mailbox message.

Table 4-2 Modem Standards and Supported Features

Feature	Description
Carrier protocols	ITU V.23 at 75/1,200 bps Telcordia Technologies (formerly Bellcore) 103 at 300 bps ITU V.21 at 300 bps ITU V.22 at 1,200 bps Telcordia Technologies (formerly Bellcore) 212A at 1,200 bps ITU V.22bis at 2,400 bps ITU V.32 up to 9,600 bps ITU V.32bis up to 14,400 bps V.32 turbo up to 19,200 bps V.FC up to 28,800 bps V.34 up to 28,800 bps V.34+ up to 33,600 bps TIA/ITU 56K up to 56,000 bps (when standardized) K56flex
Error-correcting link-access protocols	V.42 LAPM, MNP 2-4
Compression protocols	V.42bis (includes MNP 5)
Command interface	Superset of the AT command set
In-band signaling/tone generation and detection	DTMF generation DTMF detection MF generation MF detection
Other	Out-of-band access for management PPP and SLIP framing

Verifying and Troubleshooting the Installation

During normal operation, all five DMM card LEDs light when the modem card is powered ON. When the modem card CPU software starts running, it shuts off all LEDs except the power LED. The LEDs then light again as described in Table 4-1.

To complete the installation, verify that the DMM card LEDs operate properly by observing the following LED states:

If the power LED lights on other modem cards in the dial shelf, try inserting the DMM card in a different slot. If none of the power LEDs light, check your dial shelf power connections, power entry modules, and AC-input power supplies (if present).

If the HCPU LED lights, the DMM card has passed diagnostics and the system software is up and running.

If the HCPU LED is OFF but the power LED is ON, the software image might have failed to load onto the card. The dial shelf controller attempts to reload the software automatically. If a programmed number of attempts to reload the software image fails, the dial shelf controller will power OFF the DMM card and the HCPU light will shut off.

Verify that the other cards in the dial shelf work properly. Verify that the card is seated properly. Try inserting the card in a different slot. Verify that you are using the correct software image by using the show modem version command.

If the modems LED lights, all modem modules present on the card pass diagnostics. You can also verify modem operation by using the show modem command.

If the modems LED fails to light, you have a faulty DMM card. Return the modem card to the factory for a replacement.

For further installation troubleshooting information, refer to the Cisco AS5800 Universal Access Server Hardware Installation Guide.

Configuring the Modems

The Cisco 5814 dial shelf is designed to recognize modem cards in slots 0 to 11 within the dial shelf chassis. If you are installing ten modem cards in the dial shelf chassis, we recommend that you install modem cards in slots 2 to 11 and reserve slots 0 and 1 for trunk cards.

If you are replacing a dial shelf card by installing a new dial shelf card of the same type in the same slot, the system software recognizes the new dial shelf card interfaces and brings them up automatically. No additional configuration is needed.

Table 4-3 Configuring Double-Density Modem Cards

	Command	Description
Step 1	AS5800> enable Password: password AS5800#	Enter the enable command. Enter your password. You are in privileged EXEC mode when the prompt changes to `AS5800#`.
Step 2	AS5800# configure terminal Enter configuration commands, one per line. End with CNTL/Z. AS5800(config)#	Enter global configuration mode by typing the configure command. The example uses the terminal configuration option. You are in global configuration mode when the prompt changes to `AS5800(config)#.`
Step 3	AS5800(config)# modem country country_name	Specify the country to set the modem parameters (including country code and encoding) for MICA modems. The default is usa if the access server is configured with T1 interfaces and e1-default if the access server is configured with E1 interfaces.
Step 4	AS5800(config-if)# line shelf/slot/port shelf/slot/port AS5800(config-line)#	Enter the number of modem lines to configure. If you have 144 modems¹ on a modem card in slot 2 of a dial shelf identified as shelf 2, enter 2/2/0 2/2/143.
Step 5	AS5800(config-line)# transport input all	Allow all protocols to be used when connecting to the line.
Step 6	AS5800(config-line)# autoselect ppp	Enable remote IP users running a PPP application to dial in, bypass the EXEC facility, and connect directly to the network.
Step 7	AS5800(config-line)# modem inout	Enable incoming and outgoing calls.
Step 8	AS5800(config-line)# exit AS5800(config)# [or] AS5800(config-line)# Ctrl-Z AS5800#	Type the exit command to exit out of line configuration mode. Press the Return key to verify your command registers, then type Ctrl-Z to return to privileged EXEC mode.
Step 9	AS5800# copy running-config startup-config	Save your changes when ready.

1Each DMM card contains 12 DMM SIMMs. Each DMM SIMM has 12 digital modems.

If you are installing a new modem card into the dial shelf, additional configuration is needed. For additional software configuration information, refer to the Cisco AS5800 Universal Access Server Operation, Administration, Maintenance, and Provisioning Guide that shipped with your system.

Table 4-4 contains the commands to help you configure your double-density modem lines.

Table 4-4 Configuring Double-Density Modem Lines

	Command	Description
Step 1	AS5800> enable Password: password AS5800#	Enter the enable command. Enter your password. You are in privileged EXEC mode when the prompt changes to `AS5800#`.
Step 2	AS5800# configure terminal Enter configuration commands, one per line. End with CNTL/Z. AS5800(config)#	Enter global configuration mode by typing the configure command. The example uses the terminal configuration option. You are in global configuration mode when the prompt changes to `AS5800(config)#.`
Step 3	AS5800(config)# line shelf/slot/port shelf/slot/port	Configure lines shelf/slot/1 to shelf/slot/xx. You are in line configuration mode when the prompt changes to `AS5800(config-line)#`.
Step 4	AS5800(config-line)# modem inout	Enable incoming and outgoing calls.
Step 5	AS5800(config-line)# modem autoconfigure type modem-name mica_hdms	Configure the line to attempt to configure the attached modem and select a modem type.
Step 6	AS5800(config-line)# transport input all	Configure the transport input to select all protocols.
Step 7	AS5800(config-line)# stopbits 1	Configure stop bits.
Step 8	AS5800(config-line)# flowcontrol hardware {in \| out}	Set hardware flow control and direction.
Step 9	AS5800(config-line)# login local	Enable password checking at login. The example uses local authentication based on user name.
Step 10	AS5800(config-line)# autoselect during-login	Configure a line to start a session.
Step 11	AS5800(config-line)# autoselect ppp	Configure PPP.
Step 12	AS5800(config-line)# exit AS5800(config)# [or] `AS5800(config-line)#` Ctrl-Z `AS5800#`	Type the exit command to exit out of line configuration mode. Press the Return key to verify your command registers, then type Ctrl-Z to return to privileged EXEC mode.
Step 13	AS5800# copy running-config startup-config	Save your changes when ready.

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