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Characterization of Installation Site
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Characterization of Installation Site
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Table 2: RF Plant/HFC Environment Characterization
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6
Juniper Networks G10 CMTS Pre-Installation Guide
Several parameters of the installation site need to be characterized prior to the installation of
the CMTS. These parameters relate to specific aspects of the installation site system, HFC
network connections, and CMTS downstream and upstream transmissions. The information
collected will allow field engineers to verify that the installation site environment is
compatible with the G10 CMTS. Table 2 is provided to collect information regarding the RF
plant and HFC environment.
Parameter
Plant architecture type
Number of optical links within HFC
Distance between optical links within HFC
Amplifier cascade depth from node
Homes passed per node
Total homes passed by installation site
Node combining ratio per port
Average upstream noise measurement
1
Peak upstream noise measurement
Passive loss from upstream receiver to CMTS
Maximum tap value used
Maximum tap output level at highest frequency
Maximum drop loss allowed from tap to home
Method used for return path alignment
DOCSIS services offered? If yes, complete Table 3 on page 7.
Upstream frequency spectrum utilization
1. A statistical sample of the total nodes terminated at the headend (~10%) should be taken for average and peak
noise measurements per the methodology described in "Noise Measurement Methodology" on page 13.
Value
____ HFC ____ All Coax
____ max ____ average
____ max ____ average
____ max ____ average
___:1 upstream ___:1 downstream
1
____ dB
____ dB
____ dB
____ dB
____ dBmV
____ dB
____ yes ____ no
(complete Table 6 on page 11)
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