HP 10504 - Pin Assignments

89
Pin assignments
Select an Ethernet twisted pair cable according to the RJ-45 Ethernet interface type on your device. An
RJ-45 Ethernet interface can be MDI (for routers and PCs) or MDIX (for switches). For the pinouts of RJ-45
Ethernet interfaces, see Table 55 and Table 56.
Table 55 RJ-45
MDI interface pinouts
Pin
10Base-T/100Base-TX
1000Base-T
Si
g
nal Function
Si
g
nal
Function
1 Tx+ Send data BIDA+ Bi-directional data cable A+
2 Tx- Send data BIDA- Bi-directional data cable A-
3 Rx+ Receive 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- Receive 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 56 RJ-45 MDI-X interface pinouts
Pin
10Base-T/100Base-TX
1000Base-T
Si
g
nal Function
Si
g
nal
Function
1 Rx+ Receive data BIDB+ Bi-directional data cable B+
2 Rx- Receive data BIDB- Bi-directional data cable B-
3 Tx+ Send 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- Send 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 correct communication, the pins for sending data on one port should correspond to the pins for
receiving data on the peer port. When both of the ports on the two devices are MDI or MDIX, a crossover
Ethernet cable is needed. A cross-over cable connects devices of the same type. When one port is MDI
and the other is MDIX, a straight-through Ethernet cable is needed. A straight-through cable connects
devices of different types.
If an RJ-45 Ethernet interface with MDI/MDIX autosensing enabled can automatically negotiate pin roles.
The 10500 RJ-45 Ethernet interfaces support MDI/MDIX. By default, MDI/MDIX autosensing is enabled
on a port.