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Sangoma ISA card DB25 plug pin-out

RS232		V.35
Pin #	Function	Pin #	Function
2	TxD	4	RTS
3	RxD	5	CTS
7	GND	6	DSR
4	RTS	7	GND
5	CTS	8	DCD
20	DTR	10	TxA
6	DSR	9	TxB
8	DCD	12	RxA
15	TxC	11	RxB
17	RxC	19	Tx Clock A
24	BxC (On board clock source)	20	DTR (V10 signal)
		13	DTRA (V11 signal)
		14	DTRB (V11 signal)
		21	Tx Clock B
		22	RI
		23	Rx Clock A
		25	Rx Clock B
		18	Aux. Clock B (On board clock source)
		16	Aux. Clock A (On board clock source)

"We found that the
Sangoma cards were
noticeably faster than
the routers we
replaced..."

Albert Prast
CIO, Rotech Medical

Communications hardware & software products for networks & Internet infrastructure.