Difference between revisions of "Coaxial Cable Data"

Revision as of 19:36, 6 March 2008

DS-3

DS3 interconnect cables must be made with true 75 ohm cable and connectors. Use DS-3 Coax Cable to interconnect or crossconnect DS-3 transmission equipment and Digital System Cross-connect (DSX) systems. Cables or connectors which are 50 ohm or which significantly deviate from 75 ohms will result in reflections which will lower the performance of the connection, possibly to the point of it 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. 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, Canare are some of the true 75 ohm connectors known to work. RG-6 cable will also work, though it does not meet telephony technical standards.

• telephony high speed data

RG-6U 75 Ohm

RG6U, RG-6U. Suitable for CatTV and Satellite small dish signal from LNB.

Dual RG6/U Quad Shield is ideal for antenna, cable television and satellite installations. Make two cable runs at one time for dual LNB satellite or satellite and antenna installations. This cable is 18AWG copper clad steel center conductor surrounded by a foam polyethylene dielectric. A bonded aluminum foil and 60% aluminum braid over another foil and 40% aluminum braid provide 100% shield coverage. This cable meets specifications for CL1, CL2, CM, CMX and CMG installations. Swept tested to 3GHz to ensure performance at applicable frequencies.

• rf and tv antenna
• satellite lnb signal

RG-58 Coaxial 50-Ohm

RG58, RG-58. A coaxial cable consisting of a 20 AWG solid .032" bare copper conductor with polyethylene insulation, 95% tinned copper braid shield and PVC jacket. RG-58/U is a specific type of coaxial cable often used for Thin Ethernet (10BASE2) and low-power signal connections. The cable has a characteristic impedance of either 50 or 52 Ω.

When used for Ethernet, it provides a maximum segment length of 185 meters.

Most two-way radio communication systems, such as marine SSB, marine VHF, amateur, police, fire, WLAN Antennas etc., are designed to work with 50 Ω cable.

RG-58 cable can be used for moderately high frequencies. Its signal attenuation depends on the frequency, e.g. from 0.11 dB/m at 50 MHz to 1.4 dB/m at 2 GHz.

• Ethernet / networking
• citizen band radio
• vhf, ham radio

RG-59 75 Ohm

RG59, RG-59. Made of 23 AWG solid copper, shielded with 34 AWG braided annealed copper and wrapped in a PVC jacket. RG-59/U is a specific type of coaxial cable, often used for low-power video and RF signal connections.

Frequently used for lowpass baseband video frequencies, such as composite video. RG-59 coaxial cable is commonly packed-in with consumer equipment, such as VCRs or digital cable/satellite receivers. Manufacturers tend to include only RG-59 cables because of its low cost (when compared to RG-6). However, given the short lengths provided (usually 4-6 feet), this is generally sufficient for its typical use. For broadcast RF (like tv antenna cable) its high-frequency losses are too great to allow its use over long distances.

This cable is also used with IBM 3270 equipment, WANG equipment or Black Box Coax Protocol Converters or Switches.

• composite video (RCA)
• Computer