change sb5100mod to docsis 1.1

[drewmerc]

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activating DOCSIS 1.1
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cd /n/d
enable docsis11 true
write
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disable bpi
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cd /n/d
enable bpi false
write
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enable bpi+
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cd /n/d
enable bpi true
bpi_version 1
write
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disable bpi+
-------------------
cd /n/d
enable bpi true
bpi_version 0
write