Alcatel-Lucent 7342 - Figure 6-2 GE LP MDU ONT Functional Blocks; Gpon Mac Fpga; Optical Functional Block; Table 6-2 Optical Functions of the LP MDU ONT Motherboard

6 — LP MDU, MDU, and modular ONT hardware functional blocks
6-4 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
Figure 6-2 GE LP MDU ONT functional blocks
Optical functional block
The optical functional block contains two key groups of functions: the optical
functions and the signaling functions.
Table 6-2 describes the optical functions of the LP MDU ONT motherboard.
Table 6-2 Optical functions of the LP MDU ONT motherboard
GPON MAC FPGA
The GPON MAC FPGA interacts with the optical functions and provides GPON
MAC functions. Table 6-3 describes the features of the GPON MAC FPGA.
1912
8
GMII
MII
Motherboard Service board
MII
TDM
PCI
Bus
Control
Bus
Type F
connector
Optical
functional block
Clock
Triplexer
RF video
CDR/BMLD
-48 V power
Converter
OBC
GE
multilayer
switch
CODEC/SLIC
CODEC/SLIC
CODEC/SLIC
CODEC/SLIC
Up to 24
POTS
interface
s
Up to 12
10/100/1000 Base-T
Ethernet interfaces
GE
PHY
GE
PHY
Alexandria
FPGA
DSP 8
channel
GPON
FPGA
Data
SERDES
Control
Bus
Optical function Description
Optical diplexer or triplexer Optical-to-electrical conversion. A triplexer is used for LP MDU
ONTs with RF video and a diplexer is used for LP MDU ONTs
without RF video.
Clock data recovery (CDR) Data quantization, signal-level detection, clock recovery, and
data retiming
Burst mode laser driver (BMLD) Conversion of the digital stream bursts of data from the GPON
MAC field programmable gate array (FPGA) into the
appropriate current levels for driving the laser diode
RF video amplifier Receives an RF video signal from the triplexer and produces
the required RF output for the subscriber video equipment.
The RF subsystem monitors the levels of optical and RF signals
in support of the performance management functions.