3Com 520, 510, 530 manual WAN Port Connecting Cable V.24/V.28 Support

B-6 TECHNICAL INFORMATION

WAN Port Connecting Cable – V.24/V.28 Support

The WAN port terminates with a 25-way D-type female connector. The port can be configured to support V.24 or V.28 signalling characteristics at data transfer rates up to 19.2 Kbps. The WAN port connecting cable is not supplied with the unit. The following signalling characteristics should be observed when purchasing or fabricating a suitable cable.

Pin	3Com end	Signal name	Client end
			pin no.
Links pin no.
			(25-way male
	(25-way male
	D-type		D-type
	connector)		connector)
	2	Transmit Data (TXD 103)	2
	3	Receive Data (RXD 104)	3
	4	Request To Send (RTS 105)	4
	5	Clear To Send (RTS 106)	5
	6	Data Set Ready (DSR 107)	6

Pin	3Com end	Signal name	Client end
			pin no.
Links pin no.
			(25-way male
	(25-way male
	D-type		D-type
	connector)		connector)
	7	Signal Ground (102)	7
	8	Data Carrier Detect (DCD	8
		109)
	11	Signal Ground (AutoSense)
	12	Signal Ground (AutoSense)
	15	Transmit Clock (TXCLK	15
		114)
	17	Receive Clock (RXCLK 115)	17
	18	Analog Loop Test (141)	18
	20	Data Terminal Ready (DTR	20
		108)
	21	Remote Digital Loop Test	21
		(140)
	22	Ring Indicator (RI 125)	22
	24	External Clock (EXCLK)
		If clock signals are required, connect Pin 24 to Pins 15 &
		17 at the 3Com end only.