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Status and Alarm LEDs
The Status LED indicators provide information about the status
of the instrument's receiver. The Signal, Frame and Pattern
indicators are green if the signal is good, and red during an
alarm condition. Error indicator is off or red if error detected.
Transmission Test Set Quick Reference Guide
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SIGNAL Green: Valid signal (level; data transitions)
detected at input. Red: No data transitions detected at
input or low optical/electrical power. Operates on the fore-
ground instrument.
FRAME Green: Correct framing detected at all levels of the
received signal (on the line signal plus all levels down to
the selected test channel). Red: Frame alignment lost at
one or more levels of the received signal. Operates on the
foreground instrument.
PATTERN Green: Correct detection of expected test pat-
tern. Red: Expected test pattern not received. Operates on
the foreground instrument.
ERRORS Red: An error has been detected in the received
signal. The indicator remains red for 100 ms, then returns to
off. Operates on the foreground instrument.
SONET/SDH: Indicates that at least one SONET or SDH
alarm is present. Operates on the foreground instrument.
DSn: Indicates that at least one ANSI DS1, DS2 or DS3
alarm is present. Operates on the foreground instrument.
PDH: Indicates that at least one ETSI E1, E2, E3 or E4 alarm
is present. Operates on the foreground instrument.
Multiple Instruments: Indicates that an error or alarm has
been detected by a background instrument.
History: Press <Show More> to view the alarm history.
<Show More> provides access to the detailed alarm infor-
mation (both current status and history). If an alarm has
occurred during the current test period, the History indica-
tor will be on. Operates on the foreground instrument.
Press <Reset> to reset the Alarm History data. The History
LED will go off. If an alarm condition is present during the
reset, then the LEDs associated with that alarm will remain
on after the reset. Resetting of the history data also occurs
when you start a new test period. Operates on the fore-
ground instrument.
2
Getting Started
23
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