3Com 5112M-TPLS Trans, ceiver, Port #, Polarity, Function, Specifications A

Table A-1. 50-Pin Cable Pinouts and Port Assignments

	Hub	Hub	Trans-				Hub	Trans-
Hub			ceiver		Hub	Hub		ceiver
	Pin	Function					Function
Port #			Function		Port #	Pin#		Function
	#	/Polarity					/Polarity
			/Polarity					/Polarity
Port 1	26	RX, +	TX, + (1)		Port 7	38	RX, +	TX, + (1)
Port 1	1	RX, -	TX, -	(2)	Port 7	13	RX, -	TX, - (2)
Port 1	27	TX, +	RX, + (3)		Port 7	39	TX, +	RX, + (3)
Port 1	2	TX, -	RX, -	(6)	Port 7	14	TX, -	RX, - (6)
Port 2	28	RX, +	TX, +	(1)	Port 8	40	RX, +	TX, + (1)
Port 2	3	RX, -	TX, -	(2)	Port 8	15	RX, -	TX, - (2)
Port 2	29	TX, +	RX, +	(3)	Port 8	41	TX, +	RX, + (3)
Port 2	4	TX, -	RX, -	(6)	Port 8	16	TX, -	RX, - (6)
Port 3	30	RX, +	TX, +	(1)	Port 9	42	RX, +	TX, + (1)
Port 3	5	RX, -	TX, -	(2)	Port 9	17	RX, -	TX, - (2)
Port 3	31	TX, +	RX, +	(3)	Port 9	43	TX, +	RX, + (3)
Port 3	6	TX, -	RX, -	(6)	Port 9	18	TX, -	RX, - (6)
Port 4	32	RX, +	TX, +	(1)	Port 10	44	RX, +	TX, + (1)
Port 4	7	RX, -	TX, -	(2)	Port 10	19	RX, -	TX, - (2)
Port 4	33	TX, +	RX, +	(3)	Port 10	45	TX, +	RX, + (3)
Port 4	8	TX, -	RX, -	(6)	Port 10	20	TX, -	RX, - (6)
Port 5	34	RX, +	TX, +	(1)	Port 11	46	RX, +	TX, + (1)
Port 5	9	RX, -	TX, -	(2)	Port 11	21	RX, -	TX, - (2)

Specifications A - 5