Appendix C. System Messages

PLL Alarm

Unable to achieve Phase Locked Loop on the clock pro- vided by the network interface.

Zeros Alarm

All zeros (0s) data being sent toward the network inter- face.

FIFO Alarm

Error in propagation of data through the FIFOs.

No EXT Clock

No external transmit clock at DTE (only appears if EXT

CLK is selected).

DS-1 (PBX) Interface

The following messages indicate a condition on the Base

DS-1 (PBX) interface:

Red Alarm

Not able to frame data coming to the DS-1 interface; sometimes referred to as out-of-frame (OOF).

Yellow Alarm

Remote alarm indicator (RAI) being received by the DS-1 interface.

Blue Alarm

Receiving unframed all 1s at the DS-1 interface [alarm indicator signal (AIS)].

Loss of Signal

No signal detected by the DS-1 interface.

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TDU 120e User Manual

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ADTRAN TDU 120e user manual DS-1 PBX Interface, PLL Alarm, Zeros Alarm, Fifo Alarm, No EXT Clock