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Cisco Leads 2.5/5G Ethernet Effort

10/27/2014 10:00 AM EDT
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docdivakar
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Re: Cisco Leads 2.5/5G Ethernet Effort
docdivakar   10/28/2014 2:06:56 AM
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@Rick: cost jump you broght up may be so BUT I have not seen an objective cost analysis of Cu cable vs. Fiber against reach, PoE not withstanding. In the early days of 10Gig standardization work, there was plenty of discussion over multirate PHYs. Early estimates put 2.5G PHY at 1.5X to 2.0X the cost of 1G PHY.

It is strange that this topic was never raised at HOTI this year held at Google (which you also attended!).

MP Divakar

rick merritt
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Re: Cisco Leads 2.5/5G Ethernet Effort
rick merritt   10/27/2014 9:37:28 PM
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@Doc: My understanding is 10GBase-T is too big a cost jump for the WiFi AP makers and it doesn't always support the full 100meter cable distances some businesses have come to expect in the cable layouts.

LarryM99
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Re: Cisco Leads 2.5/5G Ethernet Effort
LarryM99   10/27/2014 5:36:43 PM
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"...many countries are already offering Fiber to the Home at affordable prices"

I think the sticking point is that the U.S. is not one of those countries. Verizon is the only major cable company that I know of here that runs fiber to the home, and they have gotten criticism from their stockholders for 'wasting' money doing that when all the other ISP's are still muddling along with coax. Add that to the fact that they are pushing bandwidth scarcity as an excuse to charge content providers for access to their customers and you have a nice set of reasons to maintain the status quo. When people here truly realize how far behind the leading edge they are falling there might be enough pressure to force a change.

Viva La Revolution! :-)

Larry M.

docdivakar
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Re: Cisco Leads 2.5/5G Ethernet Effort
docdivakar   10/27/2014 5:29:54 PM
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@anon8496261 thanks, I "learnt" something "new" today on FTTH!

http://comsocscv.org/showevent.php?id=1373998135

MP Divakar

Kamal Dalmia
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Re: Cisco Leads 2.5/5G Ethernet Effort
Kamal Dalmia   10/27/2014 5:18:33 PM
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Fiber to the home involves running fiber to the entry point of the home. The signal then goes through a fiber to copper convertor box for distribution over copper inside the house. Google Fiber website has details on how it is actually implemented.

Kamal Dalmia

docdivakar
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Re: Cisco Leads 2.5/5G Ethernet Effort
docdivakar   10/27/2014 5:10:10 PM
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Hi Larry, I agree with you, Copper is reaching its limit and fiber is a better choice. The reason I am still baffled by this 2.5G/5G base-T CFI is that many countries are already offering Fiber to the Home at affordable prices. It is more efficient to use that medium to interconnect a Wave2 WiFi access point that can provide more than 1Gbps speed.

The primary costs for transceivers is really driven by manufacturing, not component costs. Assembly automation has come a long way in the last five years so fiber looks quite attractive now.

MP Divakar

Kamal Dalmia
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Re: Cisco Leads 2.5/5G Ethernet Effort
Kamal Dalmia   10/27/2014 5:03:04 PM
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The main driver for this technology is 802.11ac access points. Enterprise Access points are typically powered using "Power Over Ethernet" which is not avaiable with Fiber. PoE does not require certificed electrician whereas creating a power outlet does. Copper is the most efficient way to solve this problem.

Kamal Dalmia

docdivakar
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Re: Cisco Leads 2.5/5G Ethernet Effort
docdivakar   10/27/2014 5:01:21 PM
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@anon8496261 you are preaching to the choir regarding Cat6 vs. Cat6A :-))

There is always the option of using 10G Base-SR which has a reach of 300m using OM3 multimode fiber. The Silicon for this is shipping today and the optical transceiver modules are dropping in price.

MP Divakar

Kamal Dalmia
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Re: Cisco Leads 2.5/5G Ethernet Effort
Kamal Dalmia   10/27/2014 4:35:00 PM
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10GBASE-T can not run over existing Cat5e and Cat6 cables up to 100 meters. 10 Gbps is beyond Shannon limit of these channels. 10GBASE-T was designed to go 100 meters on newer Cat6A cables or better cables only (note Cat6 vs Cat6A).

Therefore, it is necessary to go to 2.5G and 5G rates for enterprise networks to evolve beyond 1G.

Kamal Dalmia

LarryM99
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Re: Cisco Leads 2.5/5G Ethernet Effort
LarryM99   10/27/2014 4:30:34 PM
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@docdivakar, for the most part I agree with you that 1G Base-T is adequate for now. What makes me uneasy is the underlying assumption that there will be plenty of time to migrate to the next step. For a long time the limiting factor has been the wiring infrastructure, but when I go to my local Fry's I see large spools of fiber for not that much more than Cat6X. Years ago I consulted for the CIO of a major gaming company on the wiring of a new casino, and she was specifying Cat6, which at the time was very leading-edge. The nice thing was that it could be used with the more common networking equipment at the time as well as the more advanced stuff that came later. If I were making the same choice today it would be a tougher choice. Fiber lacks a reasonable entry level today and it seems unsteady as a clear path into the future. Copper alternatives seem to be too close to being maxed out.

It is a good thing to keep an eye on what can be done with what exists, but a growing industry also has to lay out a clear path for the future.

Larry M.

 

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