10 — ONT technical specifications
10-16 July 2008 Alcatel-Lucent 7342 ISAM FTTU ONT R04.05.06
ONT Product Information Manual Edition 01 3FE 51892 AAAA TCZZA
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 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 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.
400 5.9 7.0
700 8.1 9.7
900 9.4 11.1
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.
Frequency (MHz) RG-6 coaxial per 100 ft (dB) RG-59 coaxial per 100 ft (dB)
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