Originally posted by: ScottMac
Originally posted by: idiotekniQues
Originally posted by: spidey07
Originally posted by: idiotekniQues
i understood. he was implying that in the end they are all restricted by the same backbone.
but that is incorrect, they are not all on the same capability networks:
"An interesting thread over in the AVSForums discusses how Comcast is sacrificing HD image quality as it faces competitive pressure on the HD front from both DirecTV and Verizon. Verizon obviously has ample capacity thanks to their FTTH/coax network (with GPON upgrades and all-IP on the way), and DirecTV decided to dump broadband and focus their satellite capacity on MPEG-4 HD back in 2004. Comcast on the other hand, waiting for DOCSIS 3.0, has started cramming three HD channels into each 38.8Mbps QAM, reducing image quality"
http://www.dslreports.com/show...-Quality-Vs-FiOS-92969
bwahahahhahaahahahaahhaha
What is this magical "backbone" that you speak of? Beware of things you read on the intarweb and google. They are most likely not true.
it doesnt matter if i understood the exact technical nature of his post because i understood the gist of it. substitute backbone for format or whatever he meant, i got the gist of it.
turns out i was right, verizon does not compress things further while comcast, amongst some other major providers, does. i then gave links.
i suggest you read and edumacate yourself a bit.
cheers
The issue is not the backbone (at least in this case); it's the span from the DSLAM to the house. The issue is that the signal is delivered on a single lambda (wavelength of light, of three that are carried) which is modulated with essentially the same signaling used by cable companies ... so fiber or not, it's subject to bandwidth constraints the same as copper ("overlay" means it's essentially operating in "copper emulation" mode similar to "digital cable"...).
FIOS and U-Verse use *EXACTLY* they same infrastructure (Alcatel), for example, in their fiber-to-the-home (fiber to the prem, whatever). The ONLY difference is that FIOS uses overlay mode for video (on 1550nm), and U-Verse uses straight-up IPTV (video / audio delivered over Ethernet ... which appears as "fractional Gigabit Ethernet").
Overlay mode is (with rare circumstantial exception) constrained by protocol as well as bandwidth, where IPTV is pretty much only constrained by bandwidth.