Editing Digital Signal 3 (section)

==Cabling==
DS3 interconnect cables must be made with true 75-ohm [[coaxial cable]] and connectors. Cables or connectors which are 50 ohms or which significantly deviate from 75 ohms will result in [[signal reflection]]s which will lower the performance of the connection, possibly to the point of not working. [http://telecom-info.njdepot.ericsson.net/site-cgi/ido/docs.cgi?ID=119151491D000103&KEYWORDS=&TITLE=&DOCUMENT=GR-139&DATE=&CLASS=&COUNT=1000 GR-139-CORE], ''Generic Requirements for Central Office Coaxial Cable'', 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 connector]]s 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 most reliable 75 ohm connectors known. [[RG-6]] or even inexpensive [[RG-59]] cable may work temporarily when properly terminated, though it does not meet telephony technical standards. Type 735 26 AWG is used for interconnects up to 225 feet, and Type 734 20 AWG is used for interconnects up to 450 feet.