Part of the Telecom glossary:

Digital signal X is a term for the series of standard digital transmission rates or levels based on DS0, a transmission rate of 64 kilobits per second (Kbps), the bandwidth normally used for one telephone voice channel. Both the North American T-carrier system and the European E-carrier system of transmission operate using the DS series as a base multiple. The digital signal is what is carried inside the carrier system.

DS0 is the base for the digital signal X series. DS1, used as the signal in the T1 carrier, is 24 DS0 (64 Kbps) signals transmitted using pulse-code modulation (PCM) and time-division multiplexing (TDM). DS2 is four DS1 signals multiplexed together to produce a rate of 6.312 Mbps. DS3, the signal in the T3 carrier, carries a multiple of 28 DS1 signals or 672 DS0s or 44.736 Mbps.

Digital signal X is based on the ANSI T1.107 guidelines. The ITU-TS guidelines differ somewhat. The following table summarizes the set of signals and relates them to the T-carrier and E-carrier systems.

Digital Signal DesignatorData RateDS0 MultipleT-CarrierE-Carrier
DS0 64 Kbps 1 - -
DS1 1.544 Mbps 24 T1 -
- 2.048 Mbps 32 - E1
DS1C 3.152 Mbps 48 - -
DS2 6.312 Mbps 96 T2 -
- 8.448 Mbps 128 - E2
- 34.368 Mbps 512 - E3
DS3 44.736 Mbps 672 T3 -
- 139.264 Mbps 2048 - E4
DS4/NA 139.264 Mbps 2176 - -
DS4 274.176 Mbps 4032 - -
- 565.148 Mbps 4 E4 channels - E5

This was last updated in September 2005
Contributor(s): Martin Gee, Patrick Tierce, and Michael Whyte
Posted by: Margaret Rouse

Related Terms

Definitions

  • base station

    - A base station is a fixed point of communication for customer cellular phones on a carrier network. The base station is connected to an antenna (or multiple antennae) that receives and transmits t... (WhatIs.com)

  • Open Settlement Protocol (OSP)

    - Open Settlement Protocol (OSP) is a client-server protocol that manages access control, accounting, usage data and inter-domain routing to make it easier for Internet service providers to support I... (SearchUnifiedCommunications.com)

  • autodialer

    - An autodialer is a software program that automatically dials telephone numbers from a list or a database. (WhatIs.com)

Glossaries

  • Telecom

    - Terms related to telecom, including definitions about telecommunication service providers and words and phrases about voice, video and Internet communication.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About digital signal XPowered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.