4 — ONT software and security features
4-4 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
Fragmentation
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.
AES
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 using TL1. See
the 7342 ISAM FTTU Operations and Maintenance Procedures Guide using TL1
and CLI for more information.
4.3 ONT activation methods
For the P-OLT to communicate with an ONT, the ONT must be connected to the
PON and the P-OLT must know either the serial number of the ONT, or the
subscriber location ID (SLID) of the ONT.
• A serial number is hard coded into ONTs. The ONT serial number can be entered
into the P-OLT using the ENT-ONT TL1 command before or after the ONT is
installed at the customer site. The installer must install the ONT with the
corresponding serial number at the customer site.
• The SLID is a decimal number, a hexadecimal number, or an alphanumeric string
that uniquely identifies an ONT on a PON. For the P-OLT to know an ONT by a
SLID, the SLID must be entered in two places:
• at the P-OLT using the TL1 command ENT-ONT before or after the ONT is
connected to the PON
• at the ONT before the ONT is connected to the PON, using one of the SLID entry
methods described in the following sections. The installer can use any ONT for a
customer, but the same SLID must be used. When the ONT is polled, the P-OLT and
the ONT SLIDs are compared. If the SLIDs match, the serial number is retrieved
from the installed ONT and registered at the P-OLT.
The following sections describe SLID entry methods supported by some
Alcatel-Lucent ONTs. The procedures for entering the SLID using these methods are
described in the 7342 ISAM FTTU Operations and Maintenance Procedures Guide
using TL1 and CLI.
SLID entry via craft terminal
The SLID can be entered with a laptop connected to the craft port on the ONT. This
method is only supported on ONTs that have a craft port.
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