3 — ONT and MDU general and interface technical specifications
3-18 November 2013 Alcatel-Lucent 7302 ISAM | 7330 ISAM FTTN | 7360 ISAM FX ONT R04.06.02
Edition 01 3FE 55873 AAAA TCZZA
ONT Product Information Guide
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.
• You must use either RG-6 or RG-59 coaxial cable within the home.
• Ensure proper attenuation is inserted at the coaxial output to guarantee the
following at the end of any coaxial drop:
• video signal is below 15.5 dBmV
• audio signal is below 2.55 dBmV per channel
• Tilt is a measure of the gain at the highest frequency relative to the lowest
frequency. For example, if a receiver has a tilt of 5 dB, the RF level at 50 MHz
may be 16 dBmV, the RF level at 450 MHz will be about 18 dBmV, and the RF
level at 870 MHz will be (16 dBmV + 5 dB) = 21 dBmV. Tilt is an attempt to
provide more gain at higher frequencies, to compensate for the higher loss at
higher frequencies of typical RG-6 or RG-59 coaxial cable.
RF video service configuration requires the use of TL1 commands. These commands
are issued at the P-OLT craft terminal.
14 dBmV RF video receivers
Table 3-8 lists RF video interface specifications for ONTs with a 14 dBmV receiver.
Table 3-8 RF video service specifications for ONTs with 14 dBmV receivers
RF video features Specifications
RF output level +14 dBmV @ 450 MHz using a per analog channel
measurement at the ONT output
(1)
RF slope correction (tilt) 5 to 8 dB from 50 to 870 MHz
Optical power range + 1.0 to –6.0 dB
CNR 45 dB
CSO/CTB 53 dB
MER 32 dB
(1 of 2)
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