Oh, right. I wouldn't really use them at a tower site where you want electrical isolation. Within a rack or two is great, though.
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: "George Skorup" <[email protected]> To: [email protected] Sent: Sunday, January 15, 2017 7:26:19 PM Subject: Re: [AFMUG] Direct attach sfp cables? I haven't used DACs, but just looking at the cost seems logical for intra or inter-rack x-connect. 10G-SR modules from FiberStore run $16/ea. Or if you want to stay single-mode, a 2km 10G module is $34. All the while, 0.5-3m 10G DACs are $10-15 and that's all you need to link up two SFP+ slots obviously within a few feet of each other. OTOH, I always want optical hand-off from an upstream. If it's at a tower site, and all of ours are, I don't want a surge/lightning strike on our gear to take out the carrier's switch. On 1/15/2017 7:02 PM, Jason McKemie wrote: What's the purpose? Seems like it would pretty much always be better to just use fiber... On Sunday, January 15, 2017, Josh Reynolds < [email protected] > wrote: <blockquote> Fuck DACs. Snake oil bullshit. /end rant 10GHz 100ohm On Jan 15, 2017 4:59 PM, "Jon Langeler" < [email protected] > wrote: <blockquote> What frequency do these cables operate at? Same as Ethernet? Jon Langeler Michwave Technologies, Inc. </blockquote> </blockquote>
