AW: 1550nm Serial PMD Question
Hi,
The spec is indeed not in line to the "ITU Grid". However it should be
noted that beside this small pree condition of supporting particular
wavelength there are a lot further specs required that are not at all in the
Ethernet document. This means this interface in the current spec is not
suited for direct WDM also. For WDM you would in this case require a real
SDH/SONET interface. In this respect it should also be noted that one reason
(beside the optical parameters that do not support effective transmission)
is the way the jitter is specified as this prevents the cascadability of 3 R
regens which are needed in WDM networks of larger dimensions.
Regards Juergen Rahn
> ----------
> Von: Marshall Eisenberg[SMTP:marshall@xxxxxxxxxxxxxx]
> Gesendet: Mittwoch, 2. Mai 2001 16:39
> An: stds-802-3-hssg@xxxxxxxx
> Betreff: 1550nm Serial PMD Question
>
>
> All,
> A while back there were rumors that the 1550nm Serial PMD would be ITU
> Grid
> Spec compliant, making it DWDM 'ready' I've downloaded draft D3.0 and
> cannot find any references or further notations. Can anyone shed any
> light
> on this or point out the relevant section in the draft?
>
> Regards,
>
> Marshall Eisenberg
> Director of product marketing
> Foundry Networks Inc.
> 2100 Gold Street
> P.O. Box 649100
> San Jose, CA 95164-9100
> (408) 586-1754 direct
> (408) 586-1900 fax
> (408) 398-0014 mobile
>
>