Fec; Fragmentation; Aes - Alcatel-Lucent 7302 Information Manual

Intelligent services access manager

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Table of Contents

1 — ONT and MDU overview

FEC

Forward Error Correction (FEC) is used by the GEM transport layer between the

ONTs and an P-OLT, and is based on transmitting the data in an encoded format. The

encoding introduces redundancy, which allows the decoder to detect and correct the

transmission errors.

Fragmentation occurs when a packet received at the ONT is larger than the maximum

transmission grant size. The ONT segments the packet and sends the segments in

multiple GEM frames over the GPON to the LT card at the P-OLT. The packets are

then reassembled at the LT card. Fragmentation occurs between the ONT and the

P-OLT in the upstream direction.

The SSH transport layer provides authentication, encryption, and integrity.

Encryption is provided by a public-private key exchange to negotiate a shared

session secret between the ONT and the P-OLT: the symmetric key for AES. The

connection layer provides multiplexing of different streams over the transport layer.

AES is enabled on a per-service level during service configuration at the P-OLT

November 2013

FEC is not supported on the following types of ONTs:

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

3FE 55873 AAAA TCZZA

ONT Product Information Guide