> I really wish I could agree! It would have saved me some time dealing with > it. > > There is the argument of alternative bit rates, compression, etc., but HD > streams are assumed[1] at 15 Mbps. > > At 100Gbps, I can do max 6826 streams of HD streaming. Multicast > deployments laugh at this pathetically low number of viewers. > > At an upstream aggregation point, I can easily serve ~128K subs (7 slots, 8 > ports per slot, 3 ports per $ACCESS, 8K[3] users per $ACCESS, 1 slot for > upstream). I now assume 2.5 STBs per sub[2]. This results in, more or less, > 320,000 STBs. >
Multicast for inside of a given service provider is certainly not dead and in fact its widely deployed for IPTV in DSL/FTTx networks. FIOS doesn't use it since they're not doing IPTV (traditional RFoG) but Uverse does as do most telco TV providers I've spoken with. > > To me, the math says its not dead and we'll need a couple of orders of > magnitude (to accommodate the core) in speed improvements to get the same > delivery unicast. > > [1] http://www.cablelabs.com/specifications/OC-SP-CEP3.0-I04-121210.pdfLists > 15Mbps as safe harbor value for HD > [2] > http://www.aceee.org/files/proceedings/2012/data/papers/0193-000294.pdfHas > some stat (good or bad) wrt STBs/household > [3] uBR10K (my $ACCESS comparison) specs out for max 64K CPE. One of my > guys indicates to me that the actual number might be closer to 15-25K CPE > on a given node. Please make adjustments as necessary. > > (required note: employer is Cisco. Views are my own.) > > -- > William McCall > -- Scott Helms Vice President of Technology ZCorum (678) 507-5000 -------------------------------- http://twitter.com/kscotthelms --------------------------------
