METRObility Optical Systems RADIANCE 10/100MBPS ACCESS OPTICAL NETWORK UNIT Software Settings

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.

14 User Guide