[SI-LIST] Re: about the standards of 25Gbps
- From: Vinu Arumugham <vinu@xxxxxxxxx>
- To: "Zabinski, Patrick" <zabinski.patrick@xxxxxxxx>
- Date: Wed, 09 Nov 2011 09:55:55 -0800
IEEE 802.3ba XLAUI/CAUI do include electrical specifications.
OIF CEI is also working on 25/28G SR and VSR (short and very short
reach) specifications.
VSR is likely to be used on 100G modules configured with 4x25Gbps
interfaces.
Thanks,
Vinu
Zabinski, Patrick wrote:
> OIF's CEI-25G-LR defines the waveforms (voltages, eye openings, etc.)
> and the associated channel (return loss, insertion loss, ...) for the 25
> Gb/s electrical signals. (does not define any optical signals)
>
> IEEE's 802.3ba defines the 40 Gb/s and 100 Gb/s Ethernet optical
> signals. (does not define the electrical signals; although it does
> define the "logical" interfaces for XLAUI and CAUI).
>
> At present, I believe there is no formal relationship between CEI-25-LR
> and 802.3ba.
>
> Where CEI-25-LR and 802.3ba can conceptually come together is at the
> Ethernet MAC or the optical module (called a "CFP"). However, I believe
> the existing CFP definition (http://www.cfp-msa.org) support 10 Gb/s
> SerDes signals (under the terms XLAUI and CAUI) and not 25 Gb/s signals.
> Future extensions to either 802.3ba or CFP MSA might support 25 Gb/s
> electrical signals, but believe they are unrelated as of today.
>
> If your study is specific to 25 Gb/s signals, then I suggest focusing on
> OIF's CEI-25G (and CEI-28G) standards.
>
>
>> I am studying the standards of the 25Gbps. I am trying explain
>> the difference of two standards that CEI-25G-LR and IEEE 802.3ba. But
>> i am puzzle about these. Can anyone tell me what is the difference
>> about the definition of these two standards.
>>
>
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