3Com 3C892 manual Front Panel LED Description, Front panel provides the following LEDs

26CHAPTER 3: HARDWARE DESCRIPTION AND INSTALLATION

Front Panel LED Description

The front panel provides the following LEDs.

						LAN STATUS				3 Com
Alert	POWER	ISDN	B1	B2	TX	COLL 1	2	3	4	ISDN LAN Modem
										3C892
		OK

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	Green	D Channel Status. Indicates the status of the ISDN physical
OK		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	B1/B2 Channel Activity. Green indicates a data call in progress.
	Green	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.