3Com 3C882 Front Panel LED Indicator Definitions, Color Description, Green, Synchronized, Amber

		Familiarizing Yourself with the 3C882 ISDN Modem	2-3
Table 2-1 Front Panel LED Indicator Definitions
LED	Color	Description
PWR	Green	Power Indicator. Lit when power is on and remains lit as long
		as power is supplied to the unit.
TEST	Green	Self-Test/Status. Flashes when the 3C882 ISDN modem is
		executing its power-up self-test or a user-initiated reset. If the
		results of the self-test or reset are normal, the LED goes off. If
		the result of the self-test is abnormal and a fault is detected,
		the LED remains lit but does not flash.

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.