3 — ONT and MDU general and interface technical specifications
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a March 2011 3-15
3FE 54199 AAAA TCZZA Edition 01 ONT Product Information Guide
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 3-4 shows an
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)
For example: +18 - 8 - 7 = +3 dBmV.
+ 18 dBmV (at the ONT at 870 MHz) - 8 dB (splitter) - XX dBmV (RG-59
cable loss at the highest frequency based on cable type, for example
870 MHz would be -11 dB) = Final dBmV (at set-top box or TV)
For example: +19 - 8 - 11 = -1 dBmV.
The cable attenuation loss is based on the frequency and the type of cable used, as
listed in Table 3-7.
Maximum 100ft (30.48m) RG-6
-xxdB
Set-top
box 1
Set-top
box 4
ONT
Maximum 100ft (30.48m) RG-59
-xxdB
1:4
maximum
split
+14 dBmV +0 dBmV minimum
T1 to -6 dB optics input
19061
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