Nortel Networks NTRN10AN Left interface LIF NTN451BA, NTN451BH, Left OAM Loam NTN451MA, NTN451MH

3-38Hardware feature descriptions

Figure 3-21

Left OAM (LOAM) (NTN451MA, NTN451MH)

EX0790p

Cable stress relief

Hinged screw

Unit mount screw

RS-232

LOAM I/O pins

COLAN

ILAN 1

ILAN 2

Fan alarms

Hinged screw

Unit mount screw

Left interface (LIF) (NTN451BA, NTN451BH)

The LIF is inserted in slot 1a and provides a connection for the LOAM. The LIF also provides the inventory connection for the power modules.

	See Table 3-3 on page 3-6for operational temperature ranges.
	See Figure 3-22for the details of the LIF. The following table provides a list
	of the LIF LEDs.
LED	Description
Power	Shelf is receiving power when the LED is lit.
Critical	A Critical alarm condition exists for one of the circuit packs on the shelf.
Major	A Major alarm condition exists for one of the circuit packs on the shelf.
Minor	A Minor alarm condition exists for one of the circuit packs on the shelf.
Remote	An alarm condition exists on one of the other network elements in the system.
ACO	The ACO button has been pressed and an audible alarm can be suppressed. This
	LED is also used for the Lamp Test.

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004