Telephone Cable
Phone
cable generally contains two pairs of wires, for two phone lines.
The first pair is green and red; the second is black and yellow.
This set of colors is standardized for stranded wires (where
each "wire" consists of about 20 little tiny wires that stick
in your fingers and hurt like hell if you aren't careful.) For
solid wires, the colors defined below for Ethernet are used;
pair 1 is White/Blue+Blue, pair 2 is White/Orange+Orange.
RJ-11
Plug Wiring
This is the wiring for the plug side of an RJ-11 connector.
Can you say "BRGY"? (Think about cheap red wine; I know I do.)
The diagram is shown with the "hook" - the little thing you
press on to get the plug out - underneath. RJ-11 sockets always
have the colors indicated on the terminals.
Note
that the connector on the other end of an RJ-11 connector
is wired in reverse order. That is, if you stretch
the cable out flat, the Black wire stays on the left all the
way to the other end, including through the connector with
the hook oriented down also. Also note that the RJ-11 connector
has six terminals on it. Only the middle 4 are normally used.
Line 1 is the center pair: red and green, as in Christmas.
T-568B
Color Code for RJ-45 Plug
Eight-conductor
data cable contains 4 pairs of wires. Each pair consists of
a solid (or predominantly) colored wire and a white wire with
a stripe of the same color. The pairs are twisted together.
To maintain reliability on Ethernet, you should not untwist
them any more than necessary (like about 1 cm).
There are two wiring standards for these cables, called "T-568A"
and T-568B" They differ only in connection sequence, not in
use of the various colors. The illustration shown is for T-568B.
The pairs designated for 10BaseT Ethernet are Orange and Green.
The other two pairs, Brown and Blue, can be used for a second
Ethernet line or for phone connections.
Note
that the Blue pair is on the center pins and conveniently
corresponds to the Red and Green pair in a normal phone line.
The connections shown are specifically for an RJ45 plug (the
thing on the end of the wire). The wall jack may be wired
in a different sequence because the wires are actually crossed
inside the jack. The jack should either come with a wiring
diagram or at least designate pin numbers that you can match
up to the color code below.
Pin Number
Designations
There are pin number designations for each color in T568B
as well. The pin designations are as follows:
Color Codes for T568B |
Pin |
color |
pair |
name |
1 |
wh/or |
2 |
TxData
+ |
2 |
or |
2 |
TxData
- |
3 |
wh/grn |
3 |
RecvData+ |
4 |
blu |
1 |
|
5 |
wh/blu |
1 |
|
6 |
grn |
3 |
RecvData- |
7 |
wh/brn |
4 |
|
8 |
brn |
4 |
|
Note that the odd pin numbers are always the white with stripe
color.
Wiring
Diagrams for Straight Through, Cross Over and Y cables
Note:
The hook is underneath in all cases and Pin one is always
on the Left
|
