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This cable can be used to cascade hubs, or for connecting two
Ethernet stations back-to-back without a hub. It works with
10Base-T, 100Base-TX, 100Base-T4 and 1000Base-T. Use a good enough cable, if
you are confused about categories of cables then use category 5e(nhanced) and
you'll be fine even at 1000Base-T.

== Pinout ==

[[Image:rj45m.png]]

RJ45 MALE CONNECTOR to network interface card 1.

[[Image:rj45m.png]]

RJ45 MALE CONNECTOR to network interface card 2.

(1000Base-T names in parentheses)

{| {{border}}
! Name         !! NIC1 !! Color        !! NIC2                                                         !! Name
|-
| TX+ (BI_DA+) || 1    || White/Orange || 3                                                          || RX+ (BI_DB+)
|-
| TX- (BI_DA-) || 2    || Orange       || 6                                                          || RX- (BI_DB-)
|-
| RX+ (BI_DB+) || 3    || White/Green  || 1                                                          || TX+ (BI_DA+)
|-
| - (BI_DC+)   || 4    || Blue         || 7                                                          || - (BI_DD+)
|-
| - (BI_DC-)   || 5    || White/Blue   || 8                                                          || - (BI_DD-)
|-
| RX- (BI_DB-) || 6    || Green        || 2                                                          || TX- (BI_DA-)
|-
| - (BI_DD+)   || 7    || White/Brown  || 4                                                          || - (BI_DC+)
|-
| - (BI_DD-)   || 8    || Brown        || 5                                                          || - (BI_DC-)
|}

That means that the white/orange cable connected to NIC 1 pin 1 should go to NIC 2 pin 3 and NIC 1 pin 2 to NIC 2 pin 6 etc.

<i>Notes:
* It's important that each pair is kept as a pair. TX+ & TX- must be in the pair, and RX+ & RX- must together in another pair. (Just as the table above shows).''
* While 10Base-T and 100Base-TX only uses 2 pairs, please connect all four since 100Base-T4 and 1000Base-T needs them and save yourself some future debugging :)''
* The colors originate from the numbering and name on NIC1.</i>

== Contributions ==
* [[User:Joakim|Joakim Ögren]]
* [[User:Niklas|Niklas Edmundsson]]
* [mailto:jimc@megalink.net Jim C?]
* [mailto:JDP6640@ritvax.isc.rit.edu Jason D. Pero]
* [mailto:oscar@charpy.etsiig.uniovi.es Oscar Fernandez Sierra]
* [mailto:CayceB@yardboy.com Cayce Balara]
* [mailto:broidoj@gti.net Jeffrey R. Broido]
* [mailto:Patrick@mail.beon.be Patrick Smart]
* [mailto:broidoj@gti.net Jeffrey R. Broido]
* [mailto:KScholte@BigFoot.Com Kim Scholte]

== Sources ==
* IEEE Std 802.3, 2000 Edition

[[Category:Cable]]
[[Category:Network]]