Allied Telesis AT-8500 Series manual Unused RX- and Vport-2 TX- and Vport-2

Appendix A: Technical Specifications

Table 13. 10/100Base-T Port MDI/MDI-X Pin Signals with PoE

Pin	MDI Signal	MDI-X Signal
4	Unused	Unused
5	Unused	Unused
6	RX- and Vport-2	TX- and Vport-2
7	Unused	Unused
8	Unused	Unused

1.Vport-1 can be positive (+) or negative (-), depend- ing on the requirements of the powered device con- nected to a port.

2.Vport-2 can be positive (+) or negative (-), depend- ing on the requirements of the powered device con- nected to a port. If Vport-1 is positive, then Vport-2 will be negative. If Vport-1 is negative, then Vport-2 will be positive.

Table 14 lists the RJ-45 pin signals for the two 10/100/1000-Base-T ports on the AT-8550GB switch when the ports are operating at 1000 Mbps.

Table 14. MDI and MDI-X Pin Signals (1000Base-T)

MDI Configuration			MDI-X Configuration
Pinout	Pair		Pinout	Pair
1	Pair 1 +		1	Pair 2 +
2	Pair 1 -		2	Pair 2 -
3	Pair 2 +		3	Pair 1 +
4	Pair 3 +		4	Pair 4 +
5	Pair 3 -		5	Pair 4 -
6	Pair 2	-	6	Pair 1	-
7	Pair 4	+	7	Pair 3	+
8	Pair 4	-	8	Pair 3	-

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