Description: This object indicates the line status of a ds3/e3 interface. Each bit position (bit-0 to bit-18) represents one failure condition of the interface. Bit-19 and bit-20 are used to represent Timing Marker bit and National Use bit. Note that the SYNTAX type of Counter instead of INTEGER is used here as there are more than 16 different conditions to represent. The followings define the various bit position and their meanings:

Bit Description

0: No alarm present 1: Out of Frame Alarm received 2: Loss Of Signal Alarm received 3: Alarm Indication Signal Alarm received 4: Red Alarm received 5: Far End Receive Failure Alarm received (Non E3 G.751 only) Remote Alarm Indication Alarm received (E3 G.751 only) 6: Change Of Frame Alignment Alarm received 7: PLCP Out Of Frame Alarm received 8: PLCP Yellow Alarm received 9: PLCP Framing Bit Error Alarm received 10: PLCP Bit Interleaved Parity Error Alarm received 11: PLCP Loss Of Frames Alarm received 12: PLCP Far End Block Error Alarm received 13: Cell Loss Alarm received 14: Far End Block Error Alarm received 15: Parity Error Alarm received 16: Trail Trace ID Mismatch Alarm received (E3 G.832 only) 17: Rx Payload Type Mismatch Alarm received (E3 G.832 only) 18: Unequipped Payload Type received (E3 G.832 only) 19: Timing Marker Bit (bit 8 of the E3 G.832 Maintenance and Adaptation bye) received. 20: National Use bit (bit 12 of the frame in a E3 G.751 frame) received.