Enabling Or Disabling Loopback Tests - 3Com 3C10402B Administrator's Manual

Enabling or Disabling
Loopback Tests
Local Loopback — An internal (within the framer) diagnostic
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loopback in which the signal returned towards the source is framed.
Framer Loopback — An internal (within the framer) loopback that
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tests the path up to where framing is introduced.
Payload Loopback — A loopback in which the signal returned
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toward the source of the loopback command comprises the payload
of the received signal (with bit sequence integrity retained) and newly
generated ESF framing (not necessarily maintaining the integrity of the
channel timeslots, frames, or superframes of the received signal). The
newly generated ESF data link contains a valid performance report
message with a value of one in every LB-labeled bit position for the
duration of the loopback indicating the signal is the result of a payload
loopback.
You can use the NBX NetSet utility to enable or disable loopback test
support for 3C10116D T1 and 3C10165D E1 cards. By default, loopback
test support is disabled. After you enable loopback test support, you can
initiate the Local and Framer tests. The Central Office, or test equipment
emulating Central Office equipment, must initiate Line and Payload tests.
CAUTION: If you enable one or more loopback tests, you will terminate
any active calls on all channels of the selected span and make that span
unavailable for calls until you disable loopback testing.
To enable or disable loopback support:
1 Login to the NBX NetSet utility using the administrator login ID and
password.
2 Click the appropriate link:
PSTN Gateway Configuration > T1 Spans
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PSTN Gateway Configuration > ISDN PRI Spans
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3 Click the MAC address of a span.
4 Enable or disable the Enable Loopbacks check boxes as required and then
click Apply.
To view the results of Local and Framer loopback testing Span status
1 Login to the NBX NetSet utility using the administrator login ID and
password.
2 Click the appropriate link:
Using Loopback Tests 189