Re: [STDS-802-3-EPOC] Question on FER Objective

[Geoff Thompson <thompson@xxxxxxxx>]

All-

The max "legal" frame size these days is 2000 octets.
    (Ref: 802.3-2012, Table 4-2)
This "headspace" beyond the legacy 1518 limit was put in to accommodate 
the various encapsulation protocols that add to the maxBasicFrameSize of 
1518 octets.

The additions come with:
     -Virtual LAN (VLAN) protocols as found in 802.1Q as well as 
proprietary protocols.
    - Security encapsulation protocols as found in 802.1AS as well as 
proprietary protocols.
Multiple instances of the above which result in nested encapsulation.

There is also a non trivial market and installed base for applications 
which use so-called "Jumbo Frames" involving frames sizes of at least 4K 
bytes.
These applications are not dealt with in 802.3 but support or at least 
reasonable error performance for these sizes is a very real issue of 
product design for silicon vendors.

I hope this helps.

    Geoff Thompson

On 301//13 1:37 PM, Victor Blake wrote:
> 802.3-2012 includes the .1as (I think that's it) amendment -- 
> basically 2000 total should be supported (without getting into # that 
> are payload versus header, etc.).
>
> -Victor
>
> *From:* Mark Laubach [mailto:laubach@xxxxxxxxxxxx]
> *Sent:* Wednesday, January 30, 2013 4:04 PM
> *To:* STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx
> *Subject:* Re: [STDS-802-3-EPOC] Question on FER Objective
>
> Hi Steve,
>
> Likely we probably all assumed 64 octet to ~1518 octet Ethernet 
> packets and probably should discuss up to 2000 octets.
>
> I'm assuming others will comment on this.
>
>
> Cheers,
>
> Mark
>
> *From:* Shellhammer, Steve [mailto:sshellha@xxxxxxxxxxxxxxxx]
> *Sent:* Wednesday, January 30, 2013 10:40 AM
> *To:* STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx 
> <mailto:STDS-802-3-EPOC@xxxxxxxxxxxxxxxxx>
> *Subject:* [STDS-802-3-EPOC] Question on FER Objective
>
> Mark, et. al.,
>
>                In our Objectives it says we have a frame error ratio 
> (rate) of 10^-6 on the downstream and 5x10^-5 on the upstream,
>
> http://grouper.ieee.org/groups/802/3/bn/EPoC_objectives_update_1115.pdf
>
>                In 802.3 what frame size is used in this objective?
>
> Thanks,
>
> Steve
>
> ------------------------------------------------------------------------
>
> <="" p="">
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------

________________________________________________________________________

To unsubscribe from the STDS-802-3-EPOC list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-3-EPOC&A=1