# 1 DS3 Information

Overview

This chapter provides information for configuring DS3, setting up your software for redundancy, and running internal diagnostics on the DS3 card.

Clarification of Terms

The term DS3 (Digital Signal, Level 3) is sometimes used interchangeably with T3, but T3 is really the physical interface over which DS3 information is transmitted. DS3 is the network interface protocol defined by ANSI Standard T1.102-1993, and according to AT&T TR62411 and TR54016.

Unless otherwise specified, the term DS3 card refers to the DS3 line card, not to the DS3 I/O card.

Digital communications link - 44.378 Mbps rate
American National Standards Institute. ANSI administers and coordinates the U.S. voluntary standardization and conformity assessment system for the
telecommunications industry. More details on these standards may be
viewed at www.ansi.org.
Digital communications link - voice, data, and video at a 1.544 Mbps rate (24 64 Kbps channels)