4 — ONT software and security features
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 4-7
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
Duplicate serial numbers
An ONT is automatically disabled when:
• A ranged ONT sends a broadcast PONID within a serial number PLOAM
message. This indicates the ONT may not be aware of its ranged state or that a
second ONT using the same serial number is on the PON.
• An ONT sends a serial number PLOAM message that does not match its assigned
ID.
• An ONT sends a serial number PLOAM message but the ONT has not been
assigned a PONID.
• A deactivate PLOAM message has been sent to the ONT three times and the ONT
has not deactivated. The ONT is then sent a disable PLOAM message.
Receive and transmit errors
There are two ways to identify marginal receive problems:
1 Self correcting CRC check for the time slot; if the time slot allocation fails a CRC
check, the ONU does not transmit in that time slot.
2 Increasing rate of becdown (Bit Error Rate Count Downstream) statistics.
There is one way to identify marginal transmission timing and level problems. If a
marginally transmitting (due to timing or optical signal levels) ONT does range,
upstream data from that ONT and possibly other ONTs on the PON will be
corrupted. Increasing rates of becup (Bit Error Count Upstream) statistics are seen.
The becup counters of the marginally transmitting ONT increase the fastest. Other
ONTs may see smaller increases.
4.7 802.1x authentication
The P-OLT maintains the 802.1x authentication state by terminating the 802.1x
protocol and authenticates end users using the RADIUS server. The ONT provides
the filters for blocking and unblocking a local area network (LAN) port on the ONT.
After the system authenticates a port using 802.1x, the user can use DHCP or PPP.
The 802.1x protocol can be enabled or disabled for each 7342 ISAM FTTU system
or for each ONT user-network interface (LAN port).
Note — The 802.1x protocol is only applicable to iBridge mode. In
iBridge mode, VLAN-tagged frames are not supported for 802.1x.
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