Duplex DS3 coaxial cable assembly, with red and black RX/TX color coded, gray, T3/E3. These cables are offered for interconnection and cross connection of DSX (Digital Cross Connect) transmission systems. Using 75 ohm Mini BNC coax. RoHS Compliance: Yes 1.0/2.3 Coaxial Connectors 75 OHM Contact Termination: Crimp/Solder Body Style: Right Angle / Straight RG Cable Type: 735a duplex 75 OHM Voltage Rating: 500V RoHS Compliant: Yes DS-3 and DS-4 Transmission Formats Digital Signal Level 3 (DS-3) and DS-4 are the transmission formats used in telephone equipment to carry traffic in Central Office facilities. DS-3 is a signal capable of 672 multiplexed voice channels, or 28 T-1s. DS-3 systems operate at a transmission rate of 44.736 Mbps and a frequency of 22.368 MHz DS-4 has a channel capacity of 4,032 voice channels, a transmission rate of 274.176 Mbps, and a frequency of 137.088 MHz. DS-1 (1.544 Mbps) and DS-1C (3.125 Mbps) are other standards from the North American digital hierarchy. DS-3 and DS-4 Cables Bellcore GR-139-CORE (Generic Requirements for Central Office Coaxial Cable) contains and defines the requirements for coax cable utilized in DS-3 and DS-4 systems. 734A*, 734D*, and 735A* are industry references for coax made for Central Office applications in general, and Digital Signal Cross-connect (DSX) applications in particular. All Belden's DS-3 and DS-4 Coax Cables conform to the requirements of Bellcore GR-139-CORE. Cross-connect or Interconnect Applications Cross-connect applications are those within a DSX. A DSX frame is an array of equipment operating at a particular digital transmission rate. Interconnect cables are those carrying signals between a DSX and a multiplexer or other transmission equipment. Digital Multiplexers (MUX) combine and de-combine individual voice channels for transmission or distribution. DS-3 and DS-4 signals are also carried within and between patch panels, transmitters, receivers and telephone switches.