Pin Assignments
80
7210 SAS-M CHASSIS INSTALLATION GUIDE
3HE 10089 AAAA TQZZA Edition 01 Issue: 07
8.1 Management Port Pin Assignments
Use shielded twisted-pair (STP) cable for RJ-45 connections, 100-ohm Category 3,
4, or 5 cable for 10 Mbps connections, and 100-ohm Category 5 cable for 100 Mbps
connections. Make sure that the length of any twisted-pair connection does not
exceed 328 ft (100 m).
The RJ-45 ports on the switch base unit support automatic MDI/MDI-X operation, so
you can use straight-through cables for all network connections to PCs or servers, or
to other switches or hubs. In straight-through cable, pins 1, 2, 3, and 6, at one end of
the cable, are connected straight through to pins 1, 2, 3, and 6 at the other end of the
cable. When using any RJ-45 port on these switches, you can use either straight-
through or crossover cable.
Table 16 10/100 Base-Tx MDI and MDI-X Port Pin Assignments
Pin MDI Signal Name MDI-X Signal Name
1 Transmit Data plus (TD+) Receive Data plus (RD+)
2 Transmit Data minus (TD-) Receive Data minus (RD-)
3 Receive Data plus (RD+) Transmit Data plus (TD+)
6 Receive Data minus (RD-) Transmit Data minus (TD-)
4, 5, 7, 8 Not used Not used
Note:
• The + and – signs represent the polarity of the wires that make up each wire pair.
• Auto-negotiation must be enabled for automatic MDI/MDI-X pin assignment
configuration.
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