My point is more toward end users that need redundant options ... Im yet to find a Mcdonalds, a Bank Branch or a ATM that needs a GigE circuit ... Fixed Wireless in the 512 kbps to 6 Mbps range... SF area is serviced by Covad Wireless division among others, every major US city is served by at least 1 or 2 reputable business class Wireless ISP's. Gino A. Villarini gav@aeronetpr.com Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: Holmes,David A [mailto:dholmes@mwdh2o.com] Sent: Tuesday, April 14, 2009 6:12 PM To: Gino Villarini; Deepak Jain; Jorge Amodio; nanog@nanog.org Subject: RE: Fiber cut in SF area Wireless RF links have their drawbacks: 1. Current GHz Frequency technology places upper limit of 1 Gbps on point-to-point links, and distance at 1 Gbps is limited. Commercial GiGE radios are just now appearing, replacing 100 Mbps Ethernet and oc3 SONET radios. Telco use of wireless links to backup 10/40 GiGE fiber trunks in metropolitan areas is not scalable. 2. Wireless technology contains hardware plethora of nuts, bolts, cables, fasteners, custom-tuned crystals, dishes, passive/active reflectors, in addition to layer 1 tuning best performed by EE specializing in RF. 3. Relative to fiber optic technologies, there is a very small circle of RF companies that can install, tune, and maintain wireless links correctly and reliably. 4. Tower-climbing/working skills are essential. But, what is the state of diverse telco fiber paths such that this fiber cut was not transparent to users in such a key US metropolitan area? -----Original Message----- From: Gino Villarini [mailto:gav@aeronetpr.com] Sent: Tuesday, April 14, 2009 1:42 PM To: Deepak Jain; Jorge Amodio; nanog@nanog.org Subject: RE: Fiber cut in SF area Good points, some variables are dependant on the network infrastructure of the wireless provider. Localy, the main 2 providers have a "copper/fiber independent" networks. Gino A. Villarini gav@aeronetpr.com Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145 -----Original Message----- From: Deepak Jain [mailto:deepak@ai.net] Sent: Tuesday, April 14, 2009 4:36 PM To: Gino Villarini; Jorge Amodio; nanog@nanog.org Subject: RE: Fiber cut in SF area I don't mean to jump in here and state the obvious, but wireless links are not a panacea. At least a few folks have presented that fiber grooming has affected their *region*. It's not difficult to imagine that wherever the "head" link side (or agg point) of these regional wireless networks is... probably coincides with a fiber network or other telecom POP. You are just moving where your last mile vulnerabilities are (slightly.. as you are picking up multiple power vulnerabilities, Line of Sight, and other things along the way). In the example of a tornado or other weather disturbance, wireless links are subject to fade just as much as any kind of aerial wired asset. Deepak Jain AiNET

-----Original Message----- From: Gino Villarini [mailto:gav@aeronetpr.com] Sent: Tuesday, April 14, 2009 4:12 PM To: Jorge Amodio; nanog@nanog.org Subject: RE: Fiber cut in SF area

Here in my area most of business outfits that require maximum availability of Internet or WAN conenctions have implemented dual connections from dual providers, most with a fiber/copper main and a fixed wireless backup. This trend goes from banks to Mcdonalds

Gino A. Villarini gav@aeronetpr.com Aeronet Wireless Broadband Corp. tel 787.273.4143 fax 787.273.4145

-----Original Message----- From: Jorge Amodio [mailto:jmamodio@gmail.com] Sent: Tuesday, April 14, 2009 11:21 AM To: nanog@nanog.org Subject: Re: Fiber cut in SF area

...

"Earth is a single point of failure."

On top of that, one basic principle of telecommunications:

No matter how much diversity and path redundancy, tons of concrete or titanium sealed fiber vaults you have, in the data exchange between points A and B there will be always two single points of failure: A and B.

IMHO, this thread is getting way off topic, boring and useless.

Fiber cut is over, there will be many more, move on ...

Cheers Jorge