Making an ethernet twisted pair cable, Table 37 – H3C Technologies H3C SecPath F5000-S Firewall User Manual
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Pin
10Base-T/100Base-TX
1000Base-T
Signal
Function
Signal
Function
2
Tx-
Sends data
BIDA-
Bi-directional data cable A-
3
Rx+
Receives data
BIDB+
Bi-directional data cable B+
4 Reserved
N/A
BIDC+ Bi-directional data cable C+
5 Reserved
N/A
BIDC- Bi-directional data cable C-
6
Rx-
Receives data
BIDB-
Bi-directional data cable B-
7 Reserved
N/A
BIDD+ Bi-directional data cable D+
8 Reserved
N/A
BIDD- Bi-directional data cable D-
Table 37 RJ-45 MDIX port pinouts
Pin
10Base-T/100Base-TX
1000Base-T
Signal
Function
Signal
Function
1
Rx+
Receives data
BIDB+
Bi-directional data cable B+
2
Rx-
Receives data
BIDB-
Bi-directional data cable B-
3
Tx+
Sends data
BIDA+
Bi-directional data cable A+
4 Reserved
N/A
BIDD+ Bi-directional data cable D+
5 Reserved
N/A
BIDD- Bi-directional data cable D-
6
Tx-
Sends data
BIDA-
Bi-directional data cable A-
7 Reserved
N/A
BIDC+ Bi-directional data cable C+
8 Reserved
N/A
BIDC- Bi-directional data cable C-
To ensure normal communication, the pins for sending data on one port must correspond to the pins for
receiving data on the peer port. When both of the ports on the two devices are MDI or MDIX, use a
crossover Ethernet cable; when one port is MDI and the other is MDIX, use a straight-through Ethernet
cable. To summarize, straight-through and crossover cables connect the following devices:
•
Straight-through cables connect devices of different types—for example, router to PC and router to
switch.
•
Crossover cables connect devices of the same type—for example, switch to switch, router to router,
and PC to PC.
If an RJ-45 Ethernet port is enabled with MDI/MDIX autosensing, it can automatically negotiate pin roles.
NOTE:
The RJ-45 Ethernet ports on the firewall support MDI/MDIX autosensing.
Making an Ethernet twisted pair cable
To make an Ethernet twisted pair cable:
1.
Cut the cable to a proper length with the crimping pliers.