ADTRAN TSU 120e user manual Alarm Messages, Network Interface NI, Nx56/64 Interface

Appendix D System Messages

This appendix lists and defines the alarm and status messages that appear on the TSU 120 screen.

ALARM MESSAGES

Network Interface (NI)

Red Alarm NI unable to frame align with incoming signal

Yellow Alarm Remote alarm indication (RAI) being received from far end

Blue Alarm Unframed all ones (1s) (AIS) being received at NI Loss of Signal No signal detected at NI

Nx56/64 Interface

The following messages indicate an alarm condition on the

Nx56/64 card:

Clock Slip	Difference in frequency of the data clock at the
	network and DTE
PLL Alarm	Unable to achieve Phase-locked Loop on the
	clock provided by the network interface.
Zeros Alarm	All zeros (0s) data being sent toward the network
	interface
No EXT Clock	No external transmit clock at DTE (only appears
	if EXT CLK is selected)

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