Under Construction
![](images/rj-plugs.jpg)
RJ9 RJ10 Telephone handset
RJ11 - 1 or 2 phone lines outlet
RJ14 - 2 telephone lines
RJ25 - 3 telephone lines
RJ45 Ethernet
Telephone:
pin |
RJ25 |
RJ14 |
RJ11 |
Pair |
T/R |
± |
Color |
Old |
1 |
X |
|
|
3 |
T |
+ |
white/green |
orange |
2 |
X |
X |
|
2 |
T |
+ |
white/orange |
black |
3 |
X |
X |
X |
1 |
R |
- |
blue/white |
red |
4 |
X |
X |
X |
1 |
T |
+ |
white/blue |
green |
5 |
X |
X |
|
2 |
R |
- |
orange/white |
yellow |
6 |
X |
|
|
3 |
R |
- |
green/white |
blue |
T - Tip - ground
R - Ring - 48 volts
Ringing voltage is usually 88-110Vac, 20 Hz superimposed on -48Vdc.
Source: RJ11, RJ14, RJ25 - Wikipedia
Data - Ethernet
Standard |
Required Pairs |
10M |
100M |
1000M |
Notes |
10base-T |
2 (1/2 and 3/6) |
yes |
yes |
no |
100m support only if no cat 3/4 in run |
100base-TX |
2 (1/2 and 3/6) |
yes |
yes |
no |
100m support only if no cat 3/4 in run |
100base-T4 |
4 (1/2, 3/6, 4/5 and 7/8) |
yes |
yes |
yes |
|
1000base-T |
4 (1/2, 3/6, 4/5 and 7/8) |
yes |
yes |
yes |
Functionally identical to 100base-T4 |
Source: Tech Info - LAN Wiring and Pinouts
Ethernet Wiring 8 Position 8 Contact (8P8C)
(often incorrectly referred to as RJ45)
10Base-T and 100Base-TX
TIA/EIA T-568B - Most Common
pin color function
1 wh/or TxData +
2 or TxData -
3 wh/grn RecvData+
4 blu
5 wh/blu
6 grn RecvData-
7 wh/brn
8 brn
TIA/EIA T568A (Transmit and receive colors reversed)
Based on original AT&T USOC (Universal Service Order Codes) standard
pin
1 TD+ white/green
2 TD- green
3 RD+ white/orange
4 blue
5 white/blue
6 RD- orange
7 white/brown
8 brown
A cable wired with 568A at one end and 568B at the other is a crossover cable
Standards:
- International Standards (ISO/IEC 11801:1995) for structured cabling systems
- Telecommunications Industry Association (TIA)
- The Electronic Industries Alliance (EIA) is a trade organization representing the United States high technology community, sponsoring technical standards
Links:
RJ - 45 wiring standard
Tech Info - LAN Wiring and Pinouts
568A v 568B
Return to Technology
last updated 14 Apr 2008
|