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Appendix C. System Messages
C-2 TDU 120e User Manual 61202156L2-1
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.