Table 3-7 Typical Cable Attenuation Loss Value Based On Frequency - Alcatel-Lucent 7330 Product Information Manual

3 — ONT and MDU general and interface technical specifications
Frequency (MHz)
50
100
200
400
700
900
Be sure to properly plan and design the RF video deployment at the customer site.
The following is an example of a properly planned and designed RF video
deployment. Based on 900 MHz frequency and 100 ft (30.48 m) of cable length, 0.6
dBmV is reached at the set-top box using RG-6 coaxial cable:
+18 dBmV - 8 dB - 9.4 dB = + 0.6 dBmV
The following is an example of an improperly planned and designed RF video
deployment. Based on 900 MHz frequency and 100 ft (30.48 m) of cable length, -
1.1 dBmV is reached at the set-top box using RG-59 coaxial cable:
+18 dBmV - 8 dB - 11.1 dB = -1.1 dBmV therefore should not be used.
Configuration recommendations
You can control the quality of the output signal to the subscriber by specifying a
number of parameters:
•
If the ONT operates in AGC mode, you can specify the measurement offset to
control the gain of the output signal, which ensures some measure of
performance.
•
You can set high and low optical power level thresholds for the downstream
signal. An alarm is raised if either the high or the low optical power level
threshold is crossed.
Consider the following before configuring RF video services:
ONTs supporting RF video come with a 75 Ω (F-type) coaxial interface
•
connector. You may have to install the 75 Ω coaxial F connector on the video
cable.
•
The F-type coaxial interface is typically connected to a four-way splitter in the
home.
3-16

Table 3-7 Typical cable attenuation loss value based on frequency

RG-6 coaxial per 100 ft (30.48
m) (dB)
1.9
2.7
4.1
5.9
8.1
9.4
Note —
It is the responsibility of the customer installation crew to
ensure proper on-site layout of video distribution by verifying that the
output power at the end devices, such as the TV, VCR, and STB, is
between 0 to the limit of the ONT or MDU receiver's dBmV.
March 2011
ONT Product Information Guide Edition 01
RG-59 coaxial per 100 ft (30.48
m) (dB)
2.4
3.4
4.9
7.0
9.7
11.1
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