Aviat Networks ECLIPSE EDGE, Руководство пользователя

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260-668080-001 Rev 002 March 2013 111
Eclipse Edge User Manual
Loopback and AIS Safety Timer Operation
For information on the operation of the Diagnostic Safety Timer associated with the
loopback and AIS controls, refer to
Safety Timer Operation on page 106
.
NOTE:
The IDUspe does not support loopbacks or AIS on Ethernet ports; it
does support AIS and loopbacks on trib ports.
PRBS Generation
The IDUspe DAC 16x module includes a PRBS generator and G.821 receiver to
support looped, and both-way tests on tribs. The Generator provides a standard BER
2
15-1
test pattern.
• For a looped test the IDU provides the PBBS generator and G.821 receiver.
• For a both-way test, a PRBS generator on one IDU is G.821 received on its remote
IDU, and vice-versa. PRBS generation must be enabled at both ends of the trib.
• G.821 statistics have a standard latency of 10 seconds for availability and errored
seconds; on activation wait for 10 seconds before checking.
• The PRBS generator transmits to and receives from the IDU bus. Mouse-over the
G.821 statistics panel to see a graphic of the connection. ‘
NOTE:
External BER testers provide superior measurement accuracy and
access to a wider range of test and measurement functions.
PRBS Generator and G.821 Statistics Operation
Always allow at least 10 seconds for the G.821 data to stabilize when PRBS
Generation is enabled; 10 seconds after Send.
When a both-way test is to be established, the PRBS data for the IDU first turned on
accrues errors until PRBS on the second IDU is activated. The second IDU should
display no errors after its 10 second stabilization period.
To restart a PRBS count, click Reset.
While PRBS Generation is ON, the IDU Status LED flashes orange and the diagnostic
icon is displayed in the Portal status bar.