Alcatel-Lucent 7330 Product Information Manual page 90

3 — ONT and MDU general and interface technical specifications
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.
Consider the following limitations when planning video deployments:
•
ONTs and MDUs supporting video overlays only support specific split ratios on
the coaxial distribution, based on the ONT or MDU video receiver. For for +18
dBmV receivers, the maximum split is 1:8
•
The maximum supported length of RG-6 or RG-59 coaxial cable used for +18
dBmV units is 100 ft (30.48 m).
There are numerous criteria that effect RF video overlay. Figure
example of the factors affecting RF video overlay design and deployment.
Figure 3-4 RF video overlay design and deployment example with a +14 dBmV receiver
Conditions that need to be confirmed to ensure proper RF video overlay service, as
shown in Figure 3-4, are based on:
•
+ 18 dBmV at the ONT
•
8 dB loss at the splitter in a 1:4 split; 6.6 dB loss in a 1:3 split, and 4.6 dB loss in
a 1:2 split
•
Cable attenuation loss based on frequency and cable type:
+ 18 dBmV (at the ONT at 450 MHz) - 8 dB (splitter) - XX dBmV (RG-59
cable loss at the highest frequency based on cable type, for example
400 MHz would be -7 dB) = Final dBmV (at set-top box or TV)
3-14
Maximum 100ft (30.48m) RG-6
-xxdB
Maximum 100ft (30.48m) RG-59
-xxdB
1:4
maximum
split
ONT
T1 to -6 dB optics input
+14 dBmV
December 2010
ONT Product Information Guide Edition 01
Set-top
box 1
Set-top
box 4
+0 dBmV minimum
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.41
3FE 54017 AAAA TCZZA
3-4 shows an
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