VeEX MPA, Руководство пользователя

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SONET Tab
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Test RTD functions include:
•
Action (State): Starts and stops round-trip delay mode.
Single Round-Trip Delay - If selected, a burst of payload BIT errors are
inserted into a frame and transmitted through your network. The frame's
transmission through the network is measured in frame counts and
milliseconds. Frame counts indicates the number of frames received before
the errored frame is received by the unit. Milliseconds indicates how long it
took for the errored frame to travel out and return to the unit.
Continuous Round-Trip Delay - If selected, a continuous burst of payload
BIT errors are inserted into each frame and transmitted continuously through
your network. The current frame count and duration appear in the
Current
column. The fastest round trip appears in the Minimum column and the
slowest round trip appears in the Maximum column.
Stop Round-Trip Delay - Stops round-trip delay activity. The State returns
to Inactive.
•
Round Trip Delay Time (milliSec): Indicates the duration in milliseconds that it
takes for each errored frame transmitted to return back to the unit.
•
Round Trip Delay Time (Frames): Indicates the number of frames detected
after each errored frame is transmitted and return back to the unit.
The Current column displays the most recent round trip measurement.
The Minimum column displays the fastest round trip measurement.
The Maximum column displays the slowest round trip measurement
•
Consecutive Good Time Required: This function allows you to enter the
duration (in milliseconds) of valid frames to occur before the round-trip delay
function is confirmed to be activated. It is used to fine-tune the measurement.
For all SONET and SDH processors the range is 0.125 to 2047.875 ms,
and is entered using a keypad.
•
Consecutive Good Frames Required: This function allows you to enter the
number of consecutive error-free frames to occur before round-trip
measurements stop accumulating. The range is 1 to 16383 frames and is
entered using a keypad.
MPA_e_manual_D07-00-129P_RevA00