Alcatel-Lucent 7330 Product Information Manual page 44

1 — ONT and MDU overview
The Package C ONT that supports limited configuration using web-based GUIs is the
I-241W-P indoor ONT.
1.7 ONT physical security
Physical ONT security is provided to limit unauthorized access to remote or outdoor
units. Tamper-resistant seals and bolts are used to secure the TELCO access cover to
the ONT and to prevent easy access to the enclosure. Specialized security wrenches
are required to open the pin-in Allen-type tamper-resistant screws. Certain models of
indoor ONTs cannot be opened.
1.8 Rogue ONT defense
Fault or error conditions on a single ONT may disrupt the PON for other ONTs on
the same PON. Figure
The following conditions on a single ONT may affect other ONTs using the same
PON:
•
an ONT continuously sends light up the fiber because a laser is stuck on, which
may render the PON unusable
•
two ONTs with the same serial number prevents correct ranging of both ONTs
•
an ONT misinterprets the bandwidth map, causing the ONT to transmit for the
wrong time slot allocation, disrupting the PON for another ONT that is trying to
use its correctly allocated time slot
•
an ONT signal is outside its timing window, affecting the start of another ONT
time slot
•
an ONT signal is too low or too high, causing bit rate errors or a ranging failure
1-20
1-2 shows some possible failure conditions.
Figure 1-2 Rogue ONT failure conditions
LT
2) If 2 ONTS report
identical serial #s,
7342
both ONTS are disabled
December 2010
ONT Product Information Guide Edition 01
2)
serial # 123abc
serial # 123abc
PON
ONT deactivates
X
X
Increasing
becdown
counters?
3) Bandwidth map
CRC failure
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.41
ONT
X
ONT
X
1) Watching timer
to ensure laser is
not stuck on or
no laser until
ONT s/w is ready
ONT
18997
3FE 54017 AAAA TCZZA