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| Re: Hi-def image of BMT Park Row el terminal (1122642) | |||
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Re: Hi-def image of BMT Park Row el terminal |
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Posted by SelkirkTMO on Wed Dec 7 20:59:06 2011, in response to Re: Hi-def image of BMT Park Row el terminal, posted by Chris R16/R2730 on Wed Dec 7 19:52:49 2011. On cable, the reason is that they just don't have the bandwidth going back to the headend in the reverse direction. Cable plant has frequencies from 54 MHz to whatever their top is (typically 1 GHz) and the reverse path is from 8 MHz to 50 MHz. Years ago, they used those frequencies for what was called the "T-band" consisting of television channels T-7 through T-10 for feeding cable access studios back to the headend to be turned around on up to 3 public access channels.With "intarwebs" those reverse feeds were taken away for that purpose and now your "upstream" signals go up on those frequencies and there just isn't enough bandwidth available as compared to the downstream which is typically 100 MHz worth or better. Pure FIBER is capable of symmetric bandwidth, cable is not. |
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