|
Written by Administrator
|
|
Saturday, 11 July 2009 04:09 |
|
Page 4 of 15 CablingCoaxial Cable It is more resistant to electromagnetic interference (EMI), providing a higher bandwidth and longer cable lengths compared to twisted pair. It can either transmit using a baseband method, where the cable carries only one channel or using a broadband method, where the cable carries several channels.
Twisted Pair It is cheaper and easier to work with than coaxial cable. It is less resistant to electromagnetic interference (EMI). - STP Shielded twisted pair - Has an outer foil shielding which is added protection from radio frequency interference.
- UTP Unshielded twisted pair - Different categories of cabling that have different characteristics. Least secure due to interference, crosstalk and eavesdropping.
Fiber-Optic Cabling Because of the use of glass, it has higher transmission speeds that can travel over longer distances and is not affected by attenuation and EMI when compared to cabling that uses copper. However this is most expensive compare to coax and twisted pair cabling. Cabling problems- Noise - The receiving end will not receive the data in the form that was originally transmitted. This can be caused by motors, computers, copy machines, florescent lightning and microwave ovens.
- Attenuation - The loss of signal strength as it travels or caused by cable breaks and cable malfunctions.
- Crosstalk - When electrical signals of one wire spill over to another wire. UTP is much more vulnerable to this than STP or coaxial.
- Plenum space - Plenum is area between false ceiling and actual roof, same for floor. Network cabling that is placed in plenum area must meet specific fire rating to ensure that it will not produce and release harmful chemicals in case of a fire.
- Pressurized conduits – An encapsulation of wires so that, if there is an attempt to access a wire, the pressure of the conduit will change and sound an alarm or send a message to the administrator.
|
|
Last Updated on Friday, 28 August 2009 05:02 |
