3Com 5000 ATM manual Active

6-4CHAPTER 6: TROUBLESHOOTING

Troubleshooting ATM This section explains how to read the ATM OC-3 card LEDs and OC-3 Card LEDs determine appropriate corrective action

The LEDs on the base module and ATM OC-3 cards function independent of each other.

Table 6-3 identifies possible causes and corrective actions for each LED state.

Table 6-3ATM OC-3 Card LED Corrective Actions

LED	LED State	Possible Cause	Corrective Action
TX	Green	ATM signal detected.	None required.
	Yellow	Transmitting ATM cells.	None required.
	Off	Problem with ATM switch	Check ATM switch connection and
		connection (such as cable not	interface.
		connected to ATM OC-3 card).

ATM OC-3 card failed.

If alternate ATM OC-3 card is installed, check that switchover to alternate ATM OC-3 card occurred.

RX	Green	ATM signal detected.	None required.
	Yellow	Receiving ATM cells.	None required.
	Off	Problem with ATM switch	Check ATM switch connection and
		connection (such as cable not	interface.
		connected to ATM OC-3 card).

ATM OC-3 card failed.

If alternate ATM OC-3 card is installed, check that switchover to alternate ATM OC-3 card occurred.

ACTIVE	Green	Identifies active ATM OC-3	None required.
		card.

Off ATM OC-3 card inactive.

If alternate ATM OC-3 card is installed, check that an alternate ATM OC-3 card is active.

ATM OC-3 card failed.

If alternate ATM OC-3 card is installed, check that switchover to alternate ATM OC-3 card occurred.

ALARM	Green	ATM OC-3 card failed.	If alternate ATM OC-3 card is installed,
			check that a switchover to alternate
			ATM OC-3 card occurred.
			Refer to “Recovering from Problems” on
			page 6-5.
	Off	Normal operating condition.	None required.