Cisco Systems IGX 8400 manual Trunk Operating Modes, Trunk Card Maintenance, Loopback Test

Common Alarms, Controls, and Indicators

Trunk Operating Modes

IGX trunk cards operate in either simple gateway or cell forwarding mode. Simple gateway supports service interworking, which lets Frame Relay connections terminate at ATM endpoints. For a description of simple and complex gateways, service and network interworking, tiered networks, trunks, ATM protocols, and cell and header formats, refer to the Cisco Systems Overview.

Trunk Card Maintenance

Trunk cards require no maintenance except for replacement after a confirmed failure.

Loopback Test

A trunk loopback test runs when an ATM trunk detects an integrated alarm. The loopback test indicates if the line or the card is faulty. A loopback test “pass” means the line is faulty, so a line alarm is subsequently indicated. A loopback test “fail” means the card is faulty. If the card is faulty, a switch occurs to an available Y-cable equipped redundant card.

Common Alarms, Controls, and Indicators

Front cards and back cards have faceplates with indicator LEDs. Most cards have both a green Active LED and a red Fail LED at the bottom of the faceplate. For definitions of the port status LEDs on a back card, refer to the section that describes the back card. Table 4-3describes the common card status indicators for LEDs.

Note In slots where no back card exists, a blank faceplate must reside to block Electromagnetic

Interference (EMI) and Radio Frequency Interference (RFI) and to ensure correct air flow.

Table 4-3	Common Card Status Indicators
Indicators	Status	Meaning
Fail	ON Steady	Indicates an error occurred. First, reset the card with the resetcd f
		command. If the LED comes on again, call the TAC.
Fail	Blinking	On an NPM in a redundant system, this combination indicates that
		the card is being updated.
Active	ON steady	When steadily on, this combination indicates the card is active and
		carrying traffic or processing data.
Active	ON momentarily	When momentarily on, indicates the card executed a self-test.
BOTH	OFF	Indicates the card is either part of a redundant pair and is in standby
		or is not being used at all.
BOTH	ON	Indicates the card failed but remains active because no standby card
		is available. One or more lines failed, but others remain active.

Trunk Cards 4-3