10 — ONT technical specifications
Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06 July 2008 10-15
3FE 51892 AAAA TCZZA Edition 01 ONT Product Information Manual
Consider the following limitations when planning video deployments:
• ONTs and MDUs supporting video overlays only supports various split ratios on
the coaxial distribution, based on the ONT or MDU video receiver.
• for +14 dBmV receivers, the maximum split is 1:4
• for +18 dBmV receivers, the maximum split is 1:8
• for +33 dBmV receivers, the maximum split is 1:12
• The maximum supported length of RG-6 or RG-59 coax cable used for +14 and
+18 dBmV units is 100 ft (30.48 m). The maximum supported length for +33
dBmV units is 233 ft (71.02 m).
Figure 10-1 RF video overlay design and deployment example with a + 14 dBmV receiver
Measures that need to be confirmed to ensure proper RF video overlay service, as
shown in Figure 10-1, are based on:
• + 18 dBmV or + 14 dBmV at the ONT or +33 dBmV at the MDU. See the
appropriate ONT or MDU RF interface characteristics, as dBmV varies by ONT
and MDU type.
• 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 based on frequency and cable type
+ 18 dBmV (at the ONT) - 8 dB (splitter) - XX dBmV (cable loss at the
highest frequency based on cable type) = Final dBmV
The cable attenuation loss is based on the frequency and the type of cable used, as
shown in Table 10-20.
Table 10-20 Cable attenuation loss value based on frequency
Frequency (MHz) RG-6 coaxial per 100 ft (dB) RG-59 coaxial per 100 ft (dB)
50 1.9 2.4
100 2.7 3.4
200 4.1 4.9
(1 of 2)
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
1906
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