Digital Signal 3

Digital Signal 3
"DS3" redirects here. For the U.S. Army's Disabled Soldier Support System (DS3), see Army Wounded Warrior Program. For the car, see Citroën DS3. For the locomotive, see DS3 (locomotive). For the game, see Dungeon Siege III.

A Digital Signal 3 (DS3) is a digital signal level 3 T-carrier. It may also be referred to as a T3 line.

  • The data rate for this type of signal is 44.736 Mbit/s.
  • This level of carrier can transport 28 DS1 level signals within its payload.
  • This level of carrier can transport 672 DS0 level channels within its payload.[1]
  • Such circuits are the usual kind between telephony carriers, both wired and wireless, and typically by OC1[citation needed] optical connections.

Contents

Cabling

DS3 interconnect cables must be made with true 75 ohm coaxial cable and connectors. Cables or connectors which are 50 ohm or which significantly deviate from 75 ohms will result in signal reflections which will lower the performance of the connection, possibly to the point of not working. Bellcore standard GR-139-CORE defines type 734 and 735 cables for this application. Due to losses, there are differing distance limitations for each type of cable. Type 734 has a larger center conductor and insulator for lower losses for a given distance. The BNC connectors are also very important as are the crimping and cable stripping tools used to install them. Trompeter, Cannon, Amphenol, Kings, and Canare make some of the true 75 ohm connectors known to work. RG-6 or even inexpensive RG-59 cable may work temporarily when properly connectorized, though it does not meet telephony technical standards.

DS3 Pricing

DS3 service is provided to businesses in the United States through ILEC and CLEC communication providers. The price, much like a T1 (or DS1) line, has two primary components: the loop (which is distance-sensitive) and the port (or the price the carrier charges to access the internet through their proprietary network).

External links

See also

References

  1. ^ McMahan, Emmet. "Guide to T3 / DS3 Broadband Basics". Business.com. http://www.business.com/guides/t3--ds3-broadband-basics-26403/. Retrieved 9 June 2011. 
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