Management Port Pin Assignments
Page 80 7210 SAS-M Installation Guide
Management Port Pin Assignments
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45
connections and 100-ohm Category 3, 4, or 5 cable for 10 Mbps connections or 100-
ohm Category 5 cable for 100 Mbps connections. Make sure that the length of any
twisted-pair connection does not exceed 100 meters (328 feet).
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: 10/100BASE-TX MDI and MDI-X Port Pinouts
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 pinout configuration.
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