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