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14 61220010L2-5, Issue 3 61220010L2-5C
The Event Log, shown in Figure 19, loads and time-
stamps IDSL circuit performance anomalies and
threshold violations. This screen is a very useful aid
in troubleshooting a chronic circuit. It monitors DDS
sync loss, DDS open loop, IDSL OCU-R margin,
IDSL sync loss, and power-up events. IDSL loop
signal-to-noise margin is calculated on a numerical
scale from 0-20 with 0 approximately equal to a BER
of 1 x 10
-6
and 20 equal to virtually a 0 BER.
Figure 19. Event Log Screen
The Set Circuit ID screen, Figure 20, sets the circuit
identification.
Figure 20. Set Circuit ID Screen
CIRCUIT ID:IDSL Test Unit 07/25/00 02:38:13
EVENT LOG
EVENT FIRST LAST CURRENT COUNT
DDS SYNC LOSS 07/24/00 11:10:04 07/24/00 20:45:03 CLEAR 255
DDS LOOP OPEN 07/24/00 11:10:04 07/24/00 20:45:03 CLEAR 020
OCU-R MARGIN -------- -------- -------- -------- CLEAR ---
DSL SYNC LOSS 07/24/00 11:10:04 07/24/00 20:45:03 CLEAR 021
OCU-R POWER 07/24/00 11:10:01 07/25/00 02:00:00 CLEAR 017
LAST LOG RESET 01/03/98 03:33:20
<ENTER> To CLEAR the Event Log
<ESC> To exit without destroying data
CIRCUIT ID:IDSL Test Unit 07/25/00 02:38:36
Set Circuit ID
New ID =