Overview

Management screens that you access from the SystemWAN InterfacesConfigure screen enable you to configure the settings for a T1 with an integrated CSU/DSU, including extended super frame (ESF) framing parameters and adding fractional T1 channels.

Following is a list of screens that allow you to either configure or view status for the T1 interface with an integrated CSU/DSU:

• SystemWAN
• SystemWANConfigure
• AdminHealth Check
• StatusStatisticsWAN Status

Newer T1 services use extended super frame (ESF) framing, which uses out-of-band signaling. The configuration parameters with ESF are:

• Line framing is ESF.
• Line coding is B8ZS.
• HDLC polarity is normal.
• Performance report message value is determined by the T1 service provider.

Older T1 services use super frame (SF) framing, which uses in-band signaling. The configuration parameters with SF are:

• Line framing is SF.
• Line coding is AMI.
• HDLC polarity is inverted.
• Performance report message should be set to "none" as it has no effect in SF framing.

Because SF framing uses in-band signaling, the data can generate a false yellow alarm. These false yellow alarms can be eliminated by setting one fractional T1 channel to "off." If you have the option of using SF or ESF framing, Nortel Networks recommends ESF framing because it provides better diagnostics and does not generate false yellow alarms.

Initial configuration takes place when you install the card, and configuration changes are necessary when adding additional fractional T1 channels.

All of the CSU/DSU commands can be configured through the Web interface, the serial interface, or the command line interface.