G.826 Far End; Using Loopback Tests - 3Com NBX 100 Administrator's Manual

G.826 Far End

Using Loopback
Tests
To view E1 Span far end statistics:
1 Log in to the NBX NetSet utility using the administrator username and
password.
2 In the Select Device Type box, select ISDN PRI Span List and then click
Apply.
3 When the Span List appears, click a span and then click G.826 Far End to
open the G.826 Far End Performance screen.
4 Click the Help button for details about each dialog box field.
The 3C10116D T1 and 3C10165D E1 cards can respond to commands
from the Central Office to loop back data at different points for
diagnostic purposes.
You enable each loopback test using the NBX NetSet utility. You initiate
the Local and Framer loopback tests using the NBX NetSet utility. The Line
and Payload loopback tests must be initiated by the Central Office or by
test equipment emulating Central Office equipment.
For detailed logging information, you can enable TEP logging before you
enable loopback testing. However, setting up logging and interpreting
the logs are advanced tasks that require help from a support technician.
You can see a simple pass/fail result by viewing the span status, as
described in "Enabling or Disabling Loopback Tests"
the loopback test status of all spans, use the Config & Status Report
button on the Device Configuration > Digital Line Cards tab of the NBX
NetSet utility.
The cards loop back data at the following points and with the following
characteristics:
Line Loopback — A loopback in which the signal returned toward
the source of the loopback command comprises the full 1.544 Mbits/s
signal with bit sequence integrity maintained, no change in framing,
and no removal of bipolar violations.
Local Loopback: An internal (within the framer) diagnostic loopback
in which the signal returned towards the source is framed.
Framer Loopback — An internal (within the framer) loopback that
tests the path up to where framing is introduced.

Using Loopback Tests

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