(RJ xx: telephone connection interfaces, registered with the FCC, the U.S. Federal Communications Commission.)
Pins: looking at the wiring end of a plug with the latch down, pin 1 is on the left.
pair 1: blue pair: 2 orange pair: 3 green pair: 4 brown (twisted about 3 times per inch) |
The wiring standard is defined by TIA/EIA-568. In 1991 the first revision of the standard, TIA/EIA-568-A was released. In 2001 TIA/EIA-568-B was released. In 2008 (?) the new version TIA/EIA-568-C was released. The standard now defines that the wiring by color code 568-B is completely deprecated, not valid anymore. The only valid color code for structured wiring with twisted pair cable CAT 5/6/7 shall be the same color code as with the older 568-A !!
TIA/EIA-568-A, TIA/EIA-568-C | TIA/EIA-568-B |
RJ45 Pin | Wire Color (568-C) | 10, 100BaseT Tx, Rx | Gbit Ethernet |
1 | white/green | Tx + | BI_DA+ |
2 | green | Tx - | BI_DA- |
3 | white/orange | Rx + | BI_DB+ |
4 | Blue | BI_DC+ | |
5 | white/blue | BI_DC- | |
6 | orange | Rx - | BI_DB- |
7 | white/brown | BI_DD+ | |
8 | brown | BI_DD- |
Straight Ethernet Cable TIA/EIA-568-A and C | Cross-Cable Gigabit (!) Ethernet TIA/EIA-568-A and C |
Category |
Type |
Spectral B/W |
Length |
LAN Applications |
Notes |
Cat3 |
UTP |
16 MHz |
100m |
10Base-T, 4Mbps |
Telephone Cables |
Cat4 |
UTP |
20 MHz |
100m |
16Mbps |
Rarely Used |
Cat5 |
UTP |
100MHz |
100m |
100Base-Tx,ATM, CDDI |
LAN |
Cat5e |
UTP |
100MHz |
100m |
100Base-T |
LAN |
Cat6 |
UTP |
250MHz |
100m |
1000Base-T |
LAN |
Cat7 |
ScTP |
600MHz |
100m |
1000Base-T |
LAN |
CAT 5 |
CAT 5e |
CAT 6 |
|
Frequency |
100 MHz |
100 MHz |
250 MHz |
Attenuation (Min. at 100 MHz) |
22 dB |
22 dB |
19.8 dB |
Characteristic Impedance |
100 ohms ± 15% |
100 ohms ± 15% |
100 ohms ± 15% |
NEXT (Min. at 100 MHz) |
32.3 dB |
35.3 dB |
44.3 dB |
PS-NEXT (Min. at 100 MHz) |
no specification |
32.3 dB |
42.3 dB |
ELFEXT (Min. at 100 MHz) |
no specification |
23.8 dB |
27.8 dB |
PS-ELFEXT (Min. at 100 MHz) |
no specification |
20.8 dB |
24.8 dB |
Return Loss (Min. at 100 MHz) |
16.0 dB |
20.1 dB |
20.1 dB |
Delay Skew (Max. per 100 m) |
no specification |
45 ns |
45 ns |
RJ 45 Pin | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||
Pair | Tx+ | Rx + | Rx - | Tx - |