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DOCSIS 3.1 Backwards Compatible so it can Co-Exist with Legacy DOCSIS
Episode 5 Hosted by Brady Volpe of the Volpe Firm and Nimble This with Guest John Downey of Cisco. DOCSIS 3.1 backwards compatible is good news. Other discussion highlights:
- Remote PHY
- Different bandwidths in DOCSIS 3.1
- Difference between DFB, FP and digital returns
- Legacy DOCSIS and DOCSIS 3.1 can coexistist in the same bandwidth
- DOCSIS 3.1 capacity planning can be a challenge since modulation can change dynamically
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Brady,
Do we see any OSP re-calibration requirements due to the high Peak-average ration of power levels in OFDM?
Rajeev Gambhir
Hi Rajeev,
PAPR (peak-to-average power ratio) in OFDM is a consideration in DOCSIS 3.1. However until we get actual hardware we won’t know how much internal calibration the chipset vendors have done for us. So this is certainly a factor we will be looking at. We are optimistic that a lot of the correction will be done. What is more of a concern is the impact of PAPR on return path lasers and even forward path amplifiers. Even worse is PAPR in the low cost in-home amplifiers that many homeowners purchase. These likely will not be able to handle the extra peak power from OFDM signals.
-Brady
fine!thx!