Re: [802.3BA] Longer OM3 Reach Objective
Jonathan
Looks like I pointed to the wrong IEEE com magazine, link below should
take to
the right article.
http://dl.comsoc.org/cocoon/comsoc/servlets/GetPublication?id=13392706
Thanks,
Ali
Ali Ghiasi wrote:
> Jonathan
>
> In Jan 08 interim meeting I presented the following presentation
> http://www.ieee802.org/3/ba/public/jan08/ghiasi_02_0108.pdf
> and published in IEEE communication magazine:
> http://dl.comsoc.org/cocoon/comsoc/servlets/GetPerson?id=10033162
>
> which showed even with a 4G transmitter a 300 m OM3 link has one dB
> more margin
> using a simple EDC (Electronic Dispersion Compensation) compare to a
> limiting link operating
> over 100 m of OM3 fiber, similar to:
> http://www.ieee802.org/3/ba/public/mar08/pepeljugoski_01_0308.pdf.
>
> To meet IEEE objective to support copper cable for 10 operation, some
> form of EDC
> would be required. As long as the copper and the optical
> specifications for linear
> interface are not defined in orthogonal fashion, a port supporting
> copper cable can greatly
> benefit a port supporting linear optics and extend the reach to 300 m!
>
> Previously when I stated the OM3 link can be extended to 300 m and
> with increase link
> margin, the reply was there is no such application requirements. It
> is good to hear from
> people like you.
>
> Thanks,
> Ali
>
> Jonathan Jew wrote:
>> I am a consultant with over 25 years experience in data center
>> infrastructure design and data center relocations including in excess
>> of 50
>> data centers totaling 2 million+ sq ft. I am currently engaged in data
>> center projects for one of the two top credit card processing firms
>> and one
>> of the two top computer manufacturers.
>>
>> I'm concerned about the 100m OM3 reach objective, as it does not
>> cover an
>> adequate number (>95%) of backbone (access-to-distribution and
>> distribution-to-core switch) channels for most of my clients' data
>> centers.
>>
>>
>> Based on a review of my current and past projects, I expect that a
>> 150m or
>> larger reach objective would be more suitable. It appears that some
>> of the
>> data presented by others to the task force, such as Alan Flatman's Data
>> Centre Link Survey supports my impression.
>>
>> There is a pretty strong correlation between the size of my clients'
>> data
>> centers and the early adoption of new technologies such as higher
>> speed LAN
>> connectivity. It also stands to reason that larger data centers have
>> higher bandwidth needs, particularly at the network core.
>>
>> I strongly encourage you to consider a longer OM3 reach objective
>> than 100m.
>>
>> Jonathan Jew
>> President
>> J&M Consultants, Inc
>> jew@j-and-m.com
>>
>> co-chair BICSI data center standards committee
>> vice-chair TIA TR-42.6 telecom administration subcommittee
>> vice-chair TIA TR-42.1.1 data center working group (during
>> development of
>> TIA-942)
>> USTAG representative to ISO/IEC JTC 1 SC25 WG3 data center standard
>> adhoc
>>
>>
>
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