3Com ISDN Modem manual Installing a Serial Cable, You will need the following type of serial cable

Installing a Serial Cable 2-3

LED Color Description

DGreen D Channel Status. Indicates the ISDN physical network interface and D channel status:

		Goes off once the physical and D channel signaling are
		synchronized.
		Flashes if the physical interface establishes synchronization
		and the ISDN D channel signaling procedures are not properly
		established.
		Remains lit if the physical ISDN interface is not synchronized or
		is disconnected.
B1	Amber	B1 Channel Activity. Green indicates a circuit-switched data
	or	call in progress. Amber indicates a circuit-switched voice call in
	green	progress. If a call is in a dialing state, the LED flashes. When the
		call is disconnected, the LED goes off.
B2	Amber	B2 Channel Activity. Green indicates a circuit-switched data
	or	call in progress. Amber indicates a circuit-switched voice call in
	green	progress. If a call is in a dialing state, the LED flashes. When the
		call is disconnected, the LED goes off.
SD	Green	Send Data. Indicates that information is being transmitted
		over the serial data port from the computer to the ISDN
		modem.
RD	Green	Receive Data. Indicates that information is being transmitted
		over the serial data port to the computer from the ISDN
		modem.
DTR	Green	Data Terminal Ready. Indicates that communication between
		the ISDN modem and computer has been established.

Installing a Serial Cable

You will need the following type of serial cable.

■For a Macintosh computer, you will need a 25-pin male to mini DIN 8-pin male serial cable. Refer to the information enclosed in your 3C882 ISDN modem package to order a free cable. If you are providing your own serial cable, ensure that it meets the pin specifications provided in Appendix C.

■For a PC, you will need the 25-pin male to 9-pin female serial cable that was provided. For PCs with a 25-pin serial port connector, you will need to purchase a standard 9-pin to 25-pin adapter.