Table of Contents

Cisco IGX 8400 Series Data Service

Data Service—Functional Overview

This chapter provides information on provisioning and managing data service on an IGX node. For information on provisioning service on other node types, such as the BPX, see the appropriate product documentation.

For information about the BPX, see Chapter 1, "The BPX Switch: Functional Overview ," in the Cisco BPX 8600 Series Installation and Configuration guide.

On the IGX, the HDM and LDM cards are designed to support legacy data networks, while allowing data to be transmitted over trunks along with voice, ATM, and FR traffic for optimal bandwidth utilization.

HDM and LDM cards can directly interface with customer data equipment, or connect to modems and CSUs or DSUs.

Data Terminal Equipment and Data Circuit-Terminating Equipment

Data terminal equipment (DTE) serves as a user endpoint for data. A DTE passes data to data circuit-terminating equipment (DCE) for transmission over the network circuit. DTE equipment includes routers, PCs, mainframes, and printers.

Data Service Connections Supported on the IGX

The HDM, LDM, UVM, CVM, UFM, and FRM cards support data traffic. See Table 6-1 for more information on the different types of data supported by each card.

Data Service Provisioning

This section provides information on how to provision data service on an IGX node. Information in this section applies to the HDM and LDM cards. For more information on these cards, see the "High-Speed Data Module" section and the "Low-Speed Data Module" section in Chapter 2, "Cisco IGX 8400 Series Cards."

Tip For information on using the UVM, CVM, and URM to provision data service, see Chapter 7, "Cisco IGX 8400 Series Voice Service." For information on using the UFM and FRM to provision data service, see Chapter 9, "Cisco IGX 8400 Series Frame Relay Service."

Before provisioning data service, you should perform basic configuration on the node, set up a trunk.

When provisioning data service, you will complete the following tasks:

1. Set up a data connection (see the "Setting Up a Data Connection" section).

2. Apply an interface control template to the data channel (see the "Configuring an Interface Control Template" section).

3. Configure remaining channel parameters as necessary.

4. Add the data connection to the circuit line.

Setting Up a Data Connection

Before setting up a data connection, you must configure the node, trunks, to be used for the data connection. For information on configuring the node, see "Cisco IGX 8400 Series Nodes." For information on configuring a trunk, see "Cisco IGX 8400 Series Trunks."

To set up a data connection, use the following procedure:

Step 2   (Optional) Specify the clocking for the data channel with the switch software cnfdclk command.

Step 3   Continue with additional channel configurations as needed.

Configuring an Interface Control Template

Interface control templates define how the control leads at the data interface are to be configured (asserted, inhibited, follow a local source, or follow a remote source).

To configure the interface control template to fit your particular needs, use the following procedure:

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Note    You must configure each template and each control lead individually.

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A DCE terminates a network circuit, converts bits received from the DTE to the proper bit encoding for the network, and usually provides bit clocking for the DTE. DCE equipment includes modems, CSUs/DSUs and switch interfaces.

DTE and DCE interaction requires use of control leads, which indicate when the DTE can transmit data and let the DCE know that data is incoming, and data channel clocking based on oscillators in the DCE or DTE equipment.

Interface control templates (ICTs) provide a way to manage outbound control leads on the data channel. The ICT defines outbound control lead states (off or on) for the data channel depending on the current state of the associated connection. For example, an ICT could specify that the outbound control lead, DSR, be turned off if the connection fails.

The following ICTs can be specified for each data channel:

For more information on control leads and ICTs, see the "Configuring an Interface Control Template" section.

For more information on DTE and DCE clocking, see the "High-Speed Data Module" section and the "Low-Speed Data Module" section in Chapter 2, "Cisco IGX 8400 Series Cards."

Enabling DFM on a Data Channel

Note   DFM is a purchased feature. Contact your Cisco account representative for more information (see the "Obtaining Technical Assistance" section on page xiv).

DFM on the IGX allows suppression of repetitive data patterns (such as idle codes) at the source node and regeneration of the repetitive data pattern at the remote node, resulting in more efficient bandwidth utilization. DFM is used automatically when enabled at both ends of the connection, for speeds up to 128 kbps. If DFM is not enabled, the connection will continue to generate packets for repetitive data patterns.

To enable DFM, use the following procedure:

When DFM is first activated, it defaults to enabled on each data channel with the following default values:

Step 2   (Optional) Configure DFM using the switch software cnfchdfm command at both ends of the connection to enable orderable DFM or to change the pattern length.

Enabling Embedded EIA on the LDM

The embedded EIA feature encodes the status of a single control lead as the eighth bit in each data byte. The byte subsequently is processed in accordance with the DFM algorithm, which remains unchanged.

Any DCE and DTE combination at each end is valid. A typical configuration might have the LDP at one end of a connection as DCE and an LDM at the other end as DTE. RTS is transmitted in encoded form from the remote end to the local end, and CTS is transmitted in the other direction. Other control leads use the noninterleaved format.

Note   Embedded EIA is allowed for all legal baud rates up to 19.2 kbps.

To enable embedded EIA, activate embedded EIA for the data channel with the switch software addcon local channel remote node remote channel 7/8E *Z command.

Note   You can set up different channels on the same card with or without embedded EIA, but all ports on the card must be configured at or below 19.2 kbps for embedded EIA to be active.

Switch Software Command Related to Data Service

Full command descriptions for the switch software commands listed in Table 6-2 can be accessed at one of the following links:

Where to Go Next

For information on IGX voice service, refer to Chapter 7, "Cisco IGX 8400 Series Voice Service"

For installation and basic configuration information, see the Cisco IGX 8400 Series Installation Guide, Chapter 1, "Cisco IGX 8400 Series Product Overview"

For more information on switch software commands, refer to the Cisco WAN Switching Command Reference, Chapter 1, "Command Line Fundamentals ."