Figure 3-3 Video Overlay System - Alcatel-Lucent 7330 Product Information Manual

3 — ONT and MDU general and interface technical specifications
Within the ONT functional blocks, the RF subsystem is an RF amplifier that
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. The RF video service is optional and
independent of the SoC functions. Figure
Video head end
Broadcast
video
Analog
channels
Digital
channels
Video RF mux
Private
network
VoD
VoD
server
Ethernet
Router
A Analog broadcast No STB needed
B Digital broadcast STB needed
C Broadcast and VoD STB needed
Radio Frequency Video Signal Distribution
The V-OLT uses Erbium Doped Fiber Amplifiers (EDFA). The distribution requires
a Wavelength Division Multiplexer (WDM) to be overlaid into the fiber path.
The distribution of the optical video signal is described as follows:
•
The V-OLT receives an incoming wavelength optical signal with embedded
video channels through a fiber path from the cable TV head-end equipment.
•
The V-OLT amplifies and splits the optical signal into multiple optical feeds to
the video coupler.
•
The video coupler merges the video signal over the fiber paths.
•
The fiber paths carry the optical signals between the P-OLT and the ONTs.
Coaxial connectivity in the home and design guidelines
Standard 75 Ω coaxial cable can be used, including RG-6 or RG-59 coaxial cable.
3-14

Figure 3-3 Video overlay system

Core transport Central office
1550 nm
(downstream RF video)
Video optical
EDFA
transmitter
OLT
IP
Network
1490 nm
(downstream data)
March 2011
ONT Product Information Guide Edition 01
3-3 shows the video overlay system.
Fiber (PON)
Distribution
1310 nm
(upstream)
Power Major Alarm
Processor Minor Alarm
WDM
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a
ONT Home network
A
Coax
B
Coax
C
Ethernet
Coax
3FE 54199 AAAA TCZZA