Practical 01-01- Cabling

Computer Networks Version 1.0 Cabling This practical session makes you comfortable with cabling you see on a regular basis. As you are going through computer networks, you must be aware of some fundamental issues associated with cabling. It is a part of physical layer of network layered architecture. RJ 45 Cable: In RJ 45 cable, what you will see is a cable containing 4 pairs of wires (total 8 wires) which are coloured and a connector where the wires conclude. There are 3 different types of RJ 45 cable. 1. Straight through cable: In straight through cable the coloured wires are in the same order at the both ends. Orange White

Orange

Green Blue Blue Green Brown White White White Figure: Straight Through Cable in One End

Brown

Orange White

Orange

Green Blue Blue Green Brown White White White Figure: Straight Through Cable in Other End

Brown

2. Cross Over Cable: In a crossover cable, the first (far left) coloured wire at one end of the cable is the third coloured wire at the other end of the cable. Orange White

Green Blue Blue Green Brown Brown White White White Figure: Cross Over Cable in One End Green Green Orange Blue Blue Orange Brown Brown White White White White Figure: Cross Over Cable in Other End 3. Roll Over Cable: In a rolled cable, the colored wires at one end of the cable are in the reverse sequence of the colored wires at the other end of the cable. Orange Orange Green Blue Blue Green Brown Brown White White White White Figure: Roll Over Cable in One End Brown Brown Green Blue Blue Green Orange Orange White White White White Figure: Roll Over Cable in Other End

Rushdi Shams

Orange

Dept of CSE, KUET

Use of RJ 45: The different types of RJ 45 cables are used for different purposes. The following table describes the purpose of each type. Straight Through Cable

Host to switch Host to hub Router to switch Router to hub

Crossover Cable

Hub to hub Host to host Hub to switch Router direct to host

Roll Over Cable

PC running hyper terminal to CISCO hardware

Rushdi Shams

Dept of CSE, KUET