Alcatel-Lucent 7330 - Figure 3-3 Video Overlay System

3 — ONT and MDU general and interface technical specifications
3-14 March 2011 Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a
ONT Product Information Guide Edition 01 3FE 54199 AAAA TCZZA
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 3-3 shows the video overlay system.
Figure 3-3 Video overlay system
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.
Coax
Ethernet
Coax
Coax
OLT
VoD
server
WDM
Router
IP
Network
Broadcast
video
Analog
channels
Digital
channels
VoD
Ethernet
Private
network
Video optical
transmitter
EDFA
Power
Processor
Major Alarm
Minor Alarm
Video head end Core transport Central office
Fiber (PON)
Distribution
ONT Home network
1550 nm
(downstream RF video)
1310 nm
(upstream)
1490 nm
(downstream data)
Video RF mux
Analog broadcast No STB needed
A
A
Digital broadcast STB needed
B
Broadcast and VoD STB needed
C
B
C