IMG 1010 - DS3 Overview

DS3 Overview (IMG1010 only)

DS3:

A DS3 line (also known as a T-3) is an ultra high-speed connection capable of transmitting data at rates up to 45 Mbps. A DS3 line is equal to approximately 672 regular voice-grade telephone lines and supports a DS3 signaling interface which is bipolar with Bit 3 Zero Substitution (B3ZS). The DS3 interface is a 75 ohm coax cable and must be made with true 75 ohm cable and connectors.

Previously, the DS3 interface supported the T1 protocol only. As of software 10.5.1, support for the E1 protocol over DS3 line has been added. The IMG 1010 now supports either T1 or E1 protocol but not both. The IMG 1010 can be set up to support either T1 or E1 Protocol based on the value of the Host Flag setting in the dhcpd.conf file. See IMG 1010 - Setting Host Flags link for more information on setting host flags. Below is information on span/channel support for either E1 or T1.

T1 Protocol on DS3 line (1.544 Mbps)

Supports up to 672 DS3 Channels (28 Spans * 24 DS0's)
Supports configuring 4 signaling spans as well (4 Spans * 24 DS0's)

E1 Protocol on DS3 line (2.048 Mbps)

Supports up to 672 DS3 Channels (21 Spans * 32 DS0's)
Supports configuring 3 signaling spans as well (3 Spans * 32 DS0's)

The IMG supports a total of 768 ports, therefore along with the DS3 interface you can configure the signaling spans as well.

ClientView:

ClientView will display whether the Spans are E1 over DS3 or T1 over DS3. See screen capture below

Steps to creating DS3 interfaces

Configure a T1 or E1 Bearer Profile. See IMG 1010 - Configuring T1 or E1 Bearer Profile - 10.5.x
Configure a T1 or E1 Span. See IMG 1010 - DS3 Physical Span Configuration - 10.5.x
Insert T1 or E1 profile into DS3 Spans. See IMG 1010 - DS3 Span Profile - 10.5.x