Подключение разводка кабеля Ethernet 10/100/1000Base-T and 100Base-T4 Crossover Cable

Справочная информация и описание кабеля

Ethernet 10/100/1000Base-T and 100Base-T4 Crossover

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.

 (To network interface card 1).
 (To network interface card 2).

RJ45 MALE CONNECTOR to network interface card 1.
RJ45 MALE CONNECTOR to network interface card 2.

(1000Base-T names in parentheses)

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.

Note 1: 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).

Note 2: 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 :)

Note 3: The colors originate from the numbering and name on NIC1.

Note 4: The pinout of this cable differs from what people usually calls a crossover cable since all pairs are swapped. If you need a crossover cable for use with special applications like serial cables you should not cross the pairs 4/5 and 7/8.

Contributor: Joakim Цgren, Niklas Edmundsson, Jim C?, Jason D. Pero, Oscar Fernandez Sierra, Cayce Balara, Jeffrey R. Broido, Patrick Smart, Jeffrey R. Broido, Kim Scholte Source: IEEE Std 802.3, 2000 Edition

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2004-04-12

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