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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.
D Green 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
or
green
B1 Channel Activity. Green indicates a circuit-switched data
call in progress. Amber indicates a circuit-switched voice call in
progress. If a call is in a dialing state, the LED flashes. When the
call is disconnected, the LED goes off.
B2 Amber
or
green
B2 Channel Activity. Green indicates a circuit-switched data
call in progress. Amber indicates a circuit-switched voice call in
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.