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Question Title Make Ethernet & Loopback Cable

Wire a RJ45 jack

Ethernet

Eight Position (RJ-45) Modular Cable



T568B (with clip down)

Pin

Color

1

orange/white TD+

2

orange TD-

3

green/white RD+

4

blue

5

blue/white

6

green RD-

7

brown/white

8

brown





T568A (with clip down)

Pin

Color

1

green/white TD+

2

green TD-

3

orange/white RD+

4

blue

5

blue/white

6

orange RD-

7

brown/white

8

brown


UTP consists of 4 twisted pairs. The standard colors are:
white/blue - blue
white/orange - orange
white/green - green
white/brown - brown

Hub to Hub or Computer to Computer connection:
one end T568A, other end T568B (Crossover Cable).

Hub to Computer connection:
T568B on each end.


Color codes Demarc to CSU/DSU plugs

128K or higher Frame Relay/T1 Plug

The cable from the telco demarc (punch-down block) to the CSU/DSU is just a plain straight-through 8-conductor modular cable with a RJ-48 or RJ-45 plug at the end. For short runs, flat ribbon cable is fine, and one about 6 feet is normally supplied with the CSU. Make sure that the pins are not reversed, looking through the clear plugs you should see the colored wires in the same left-to-right order on both ends. A twisted-pair ethernet cord will also work, and is better for anything over a few feet. It isn't necessary that it be shielded.



Pin Number Designations

Pin

Color

Description

1

blue

RecvData + Ring RED (or yellow)

2

blue/white

RecvData - Tip GREEN (or black)

3

Unused

Unused

4

orange

TxData + Ring YELLOW (or red)

5

orange/white

TxData - Tip BLACK (or green)

6

Unused

Unused

7

Unused

Unused

8

Unused

Unused



RJ48S pinout

An RJ48S biscuit is frequently used to terminate a data circuit. When opening the biscuit, there are 8 color coded wires. Use the internal screws to connect your cable in the following manner:

White/Blue Blue (jack)
Blue Orange (jack)
White/Orange Brown (jack)
Orange Gray (jack)

A commonly used Network Interface Device (NID) by HyperEdge - pinout diagram w. screw terminal assignments

T1 Loopback plug

56K Frame Relay plug
The plug for 56K frame relays differs slightly from the T1 or 128K+. The pairs are on different pins (7 and 8 as opposed to 4 and 5) and the transmit and recieve pairs are swapped.



Pin Number Designations

Pin

Color

Description

1

orange

TxData + Ring YELLOW

2

orange/white

TxData - Tip BLACK

3

Unused

Unused

4

Unused

Unused

5

Unused

Unused

6

Unused

Unused

7

blue

RecvData + Ring RED

8

blue/white

RecvData - Tip GREEN

 

USOC (phone) pinout




Authored by: Guru Corner
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Article Number: 30
Created: 2008-10-06 2:55 PM
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