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2-73. Error Inject LEDs (QuickBERT-T1 only)
These three LEDs illuminate to indicate that a logic, BPV, or frame bit error
has been injected. When the ERROR INJECT key is momentarily pressed,
the LED will flash and one error will be injected. When the ERROR INJECT
key is pressed and held for approximately two seconds, the LED will
constantly illuminate and inject the selected error at an error rate of 1.0E-4.
Pressing the ERROR INJECT key again will discontinue the error inject and
turn the LED off.
2-74. Receive Loop Up/Down LEDs (QuickBERT-T1
only)
When looping up a device, if the pattern receiver detects the returned loop
code and is able to achieve pattern sync, the QuickBERT-T1 assumes the
device has been looped and the RECEIVE LOOP UP LED illuminates for 3
seconds. For loop-down code, the Rx pattern receiver is loaded with the code.
If after 5 seconds the Rx pattern receiver loses sync, the span is assumed to be
taken out of loop and the RECEIVE LOOP DOWN LED illuminates for 3
seconds.
When moitoring a span, if the QuickBERT-T1 detects a loop code, the
RECEIVE LOOP UP LED will illuminate to indicate a pre-loop
condition.
2-75. Send Loop Up/Down LEDs (QuickBERT-T1 only)
When the SEND LOOP UP or SEND LOOP DOWN key is pressed the
appropriate LED will illuminate indicating that the selected loop code is being
transmitted.
2-76. Rx Input LEDs
The appropriate Rx Input LED (DSX MON, TERM, or BRDG) will illuminate
to indicate the currently-selected termination mode.
2-77. Pattern LEDs
T1 facilities are being called upon to transport various combinations of voice,
analog and digital data, and video signals via the 192-bit payload of the DS1
frame. Specially-designed BERT patterns, when used under controlled
conditions, provide a means of emulating certain payload signal characteristics.
Use of one or more test patterns, with characteristics similar to those of the
Note
Overview
2
Indicators
2-27
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