Juniper Networks G10 CMTS manual Characterization of Installation Site

Characterization of Installation Site

•	Table 27: RF Plant/HFC Environment Characterization
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•		Parameter		Value
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		Plant architecture type		____ HFC ____ All Coax
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		Number of optical links within HFC
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•		Distance between optical links within HFC		____ max ____ average
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		Amplifier cascade depth from node		____ max ____ average
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		Homes passed per node		____ max ____ average
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•		Total homes passed by installation site
•		Node combining ratio per port		___:1 upstream ___:1 downstream
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		Average upstream noise measurement (see note below)		____ dB
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		Peak upstream noise measurement (see note below)		____ dB
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•		Passive loss from upstream receiver to CMTS		____ dB
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		Maximum tap value used		____ dB
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		Maximum tap output level at highest frequency		____ dBmV
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		Maximum drop loss allowed from tap to home		____ dB
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•		Method used for return path alignment
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		DOCSIS services offered? If yes, complete Table 28 on page 77.		____ yes ____ no
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		Upstream frequency spectrum utilization		(complete Table 31 on page 81)
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•			We recommend that you take a sample of 10 percent of
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			the total nodes terminated at the installation site for
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			average and peak noise measurements using the
•			methodology described in “Noise Measurement
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			Methodology” on page 83.
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•		Table 28 is provided to collect information regarding the existing DOCSIS services supported
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		by the installation site. If there are no existing DOCSIS services supported, skip Table 28 and
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		proceed to subsequent tables. If more than two DOCSIS services exist, additional tables are
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		provided in “Additional Characterization Tables” on page 85.
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76 JUNOSg 3.0 G10 CMTS Hardware Guide