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14 User Guide
Far End Fault ................................................................................... Enabled (ON)
Link Loss Return .......................................................................... Disabled (OFF)
Link Loss Carry Forward ............................................................. Disabled (OFF)
Default Software Settings
The following settings can only be changed via software commands.
*
Loopback Mode ....................................................................................... Disabled
Port Enable/Disable ...................................................................................Enabled
Software Settings
Two operational functions on the Radiance Access Optical Network Unit can be
modified only through remote software commands.
*
Remote management
communications occur on the fiber optic segment.
Loopback Mode
Loopback is only applicable to the Access ONU’s fiber port. Loopback allows
the fiber port to return its incoming data back to the sender, while continuing to
receive and transmit management packets. The management packets are not
looped back to the sender—only the data packets are returned.
When loopback is enabled on the fiber port, its incoming data is transmitted
through most of the unit’s circuitry, not just the fiber port. This allows most of
the circuit to be tested. RMON statistics are incremented on both ports—even
though the physical interface on the copper port is neither transmitting nor
receiving traffic. During loopback, the LBK LED is lit.
When loopback is enabled, the opposite port is automatically disabled (no link).
Loopback is not supported on the Access ONU’s copper port, because the fiber
port would become disabled, resulting in a loss of control over the unit.
A full power cycle of the Access ONU takes it out of loopback.
Typically, the Access ONU’s fiber port is placed in loopback mode to test the
segment by using any standard packet-generating test equipment.
Port Enable/Disable
Either port on the Access ONU can be enabled or disabled independently. When
a port is disabled, its DIS LED is lit.
* Refer to the
Command Line Interface Reference Guide
,
NetBeacon Element Management Software Installation &
User Guide
or
WebBeacon Management Software Installation & User Guide
for software management information.