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Re:Tech Question

Consider a cable company uses 64QAM or QPSK downstream. They handle about 28 Mbps. Most will use some FEC, this uses up a chunk of that throughput, but prevents loss of packets. A DS3 handles about 45 Mbps, which would be ISP link speed. A bottleneck can occur any time a larger demand farther downstream over burdens its upstream counterparts. This can occur with too many subs on a single blade of a CMTS, or too many users bottlenecked into a limited backbone. Too many nodes combined on the return path, which contributes to the noise floor, can also cause more upstream bandwidth waste with FEC. SO you can see, there is no simple answer, without specific application data.


> I live in a 2-way CATV system with cable modem service. My download speeds vary from 500K to as low as 32K at times. Lately download speeds are almost always under 100K. I know download speeds depend on bandwidth and my question is what affects the bandwith in the downstream path.
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Posted in reply to: Tech Question by Katfish
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