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26 C
HAPTER
3: H
ARDWARE
D
ESCRIPTION
AND
I
NSTALLATION
Front Panel LED
Description
The front panel provides the following LEDs.
Figure 11
ISDN LAN Modem Front Panel
The functions of the front panel LEDs are described in Table 4. These front panel
LEDs show whether or not the unit is functioning properly and indicate the status
of the activity over the 10BASE-T and ISDN ports.
Table 4
Front Panel LED Indicator Definitions
LED Color Description
Alert Amber
Operational Status. Lit during power-on self-test diagnostic or
after pressing the reset button.
Off indicates the unit has passed the diagnostic tests and is
working properly.
Flashes (four times per second) if one or more of the diagnostics
have failed or after the unit is placed in firmware download mode
and is waiting for a firmware upgrade.Flashes (once per second) to
indicate there are pending voice mail messages.
POWER Green
Power Indicator. Remains lit as long as power is supplied to the
unit.
ISDN
OK
Green D Channel Status. Indicates the status of the ISDN physical
network interface and D channel.
Remains lit once the physical ISDN interface and D channel
signaling are synchronized.
Off indicates the physical ISDN interface is not synchronized or is
disconnected.
Flashes when the physical interface attempts synchronization or
when the ISDN D channel parameters have changed.
B1/B2 Amber or
Green
B1/B2 Channel Activity. Green indicates a data call in progress.
Amber indicates a voice call in progress. If a call is in a dialing state,
the LED flashes. When the call is disconnected, the LED goes off.
Tx Green
Ethernet Transmit Status. Flashes green when data is being
transmitted to the Ethernet LAN from the ISDN LAN Modem.
Off indicates no data is being transmitted to the Ethernet LAN
from the ISDN LAN Modem.
Coll Amber
Ethernet Collision Status. Flashes amber when some collisions
are taking place on the Ethernet LAN.
Off indicates no collisions are taking place on the Ethernet LAN.
Ports1—4 Green
Ethernet LAN Port Status. On indicates the unit detects the
Ethernet link integrity signal from an attached computer and
operation is normal.
Flashes when the LAN Modem is receiving data on that port.
Off indicates the unit does not detect the Ethernet link integrity
signal. The Ethernet cable may not be properly connected or the
cable may be the wrong polarity.
POWER
ISDN
Alert
B1
B2 TX COLL 1 2 3 4
3 Com
LAN STATUS
ISDN LAN Modem
3C892
OK