3 — ONT and MDU general and interface technical specifications
Alcatel-Lucent 7330/7302 ISAM FTTN R04.02.42a March 2011 3-17
3FE 54199 AAAA TCZZA Edition 01 ONT Product Information Guide
• 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
Note
(1)
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 14 dBmV.
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
QAM signal-to-noise ratio 40 dB
Measurement assumptions
Channel load 80 analog and 33 QAM
Digital backoff QAM-256 6 dB (QAM-256)
Digital backoff QAM-64 10 dB (QAM-64)
PON input CNR 52 dB
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