Forward Error Correction; Rogue Ont Discovery And Closure; Epon Ont Ranging - Alcatel-Lucent 7302 Information Manual

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The EPON ONT supports a minimum DBA bandwidth granularity of 64 kb/s and

±5% DBA precision.

Forward error correction

The EPON ONT supports the following FEC functions for the 10G EPON system:

configurable upstream and downstream for 1G ONT

configurable upstream for 10G/1G ONT

always enabled for 10G/10G ONT

The EPON system will automatically identify faults or error conditions using alarms

and statistics to inform operators of any problems or by using automatic action to

disable a rogue ONT to avoid disruption in the PON. Conditions on one ONT may

affect other ONTs using the same PON and cause disruption, so the system can help

operators troubleshoot and manage rogue ONTs.

The following faults or error conditions are automatically identified by the EPON

PON unusable due to ONT laser light stuck in ON position

ONT de-registers due to duplicate ONT serial numbers which prevents correct

ONT misinterprets the bandwidth map

ONT transmits the incorrect time slot allocation

ONT fails to transmit to correct time slot allocation

ONT transmits incorrect signal timing which can disrupt other ONTs

ONT transmits signals too low or too high which can cause bit rate errors or

ranging failure

Ranging is the process by which the propagation delay between the OLT and the

ONT is measured. The OLT performs the round trip delay computation using the

timestamp in the MPCP messages from the ONT.

Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02

3FE 55873 AAAA TCZZA

ONT Product Information Guide

FEC is currently not supported for ANSI.

Rogue ONT discovery and closure is currently not supported

7 — EPON ONT overview

November 2013