Re: Comcast Tests 100-Gig Optical Links in http://www.dslreports.com/forum/r20159198 en Wed, 20 Aug 2008 21:47:59 EDT Wed, 20 Aug 2008 21:47:59 EDT Re: Comcast Tests 100-Gig Optical Links http://www.dslreports.com/forum/remark,20163113 anon : Level3 fiber is ELEAF and some of the newest long haul fiber with total US coverage. Not many ran a new footprint since L3 deployed theirs.]]> http://www.dslreports.com/forum/remark,20163113 Fri, 14 Mar 2008 07:48:06 EDT Re: Comcast Tests 100-Gig Optical Links http://www.dslreports.com/forum/remark,20159210 anon : They rent the fiber from LEVEL3 SO I guess it's at least 15 year old fiber ( STD-SMF )with the new fiber (ZWPF)you can use the E-BAND wavelength " Enables 33% more bandwidth".]]> http://www.dslreports.com/forum/remark,20159210 Thu, 13 Mar 2008 13:46:45 EDT Re: Comcast Tests 100-Gig Optical Links http://www.dslreports.com/forum/remark,20159198 telcolackey :
said by idjk :

On another note, I have not kept up with fiber and I wonder what the max cap for today's fiber is- because fiber prices have come down over the years, but it may be time for the next gen of fiber cable.
Depends on the fiber and the optical system. With newer fiber like ELEAF you can run ~72+ wavelengths over systems with 50GHz spacing or 36 waves with 100Ghz spacing. Older fiber has challenges and that number is reduced.

So 720G w/ 10G waves, 2.88Tbps@40G or 7.2Tbps@100G.

So your mileage may vary and it depends on

•Channel spacing
•Capability of the installed fiber
•Transponder speeds (10, 40, 100G)

AFA running another fiber, I don't think that is needed any time soon.
--
"Believe only half of what you see and nothing that you hear." - Dinah Craik]]> http://www.dslreports.com/forum/remark,20159198 Thu, 13 Mar 2008 13:44:11 EDT Re: Comcast Tests 100-Gig Optical Links http://www.dslreports.com/forum/remark,20158981 anon :
said by idjk :

More bits per fiber is good for everybody I only hope they stick with the old stby of diverse fiber routes because with DWDM you have a lot of eggs in one basket.
Always good to see someone with a clue posting... This exact issue was discussed on the NANOG list a few weeks ago. One of the execs at Qwest was caught talking about how they wanted to use their standby routes and fibres to carry live data. It was universally rejected as a terrible idea. Yes, it results in higher utilization rates on expense equipment and fibre routes, but it also ups the ante when things fail and seriously oversubscribes the network.

Of course, on the balance sheet, it looks very nice, so I'd be willing to bet and wouldn't be surprised if Comcast or others followed Qwest's example.]]> http://www.dslreports.com/forum/remark,20158981 Thu, 13 Mar 2008 13:09:18 EDT Comcast Tests 100-Gig Optical Links http://www.dslreports.com/forum/remark,20158121 anon : More bits per fiber is good for everybody I only hope they stick with the old stby of diverse fiber routes because with DWDM you have a lot of eggs in one basket.
On another note, I have not kept up with fiber and I wonder what the max cap for today's fiber is- because fiber prices have come down over the years, but it may be time for the next gen of fiber cable.
It was only about 8-9 years ago we installed the 1st DWDM (as a test bed)here in Orlando and it was way down spec from anything today.]]> http://www.dslreports.com/forum/remark,20158121 Thu, 13 Mar 2008 10:43:59 EDT