Re: [RPRWG] Phy Layer question
Hi,
Defining a standard for SRP over existing Sonet and Gigabit Phy's may
provide the direction that 802.17 could take. Has that been considered?
Cliff Davis
Pr. Engineer
ADC The Broadband Company
8 Technology Dr.
Westboro, MA 01581
(508) 870-2506
cliff_davis@xxxxxxx
----- Original Message -----
From: Mike Takefman <tak@xxxxxxxxx>
To: Karighattam, Vasan <vasan.karighattam@xxxxxxxxx>
Cc: <stds-802-17@xxxxxxxx>
Sent: Wednesday, April 18, 2001 11:07 PM
Subject: Re: [RPRWG] Phy Layer question
>
> Vasan,
>
> With my Chair hat on.
>
> A SONET framer does not have to be de-featured to work with an
> RPR MAC. It is my technical opinion that 802.17 will not use
> every feature of SONET but that there is no advantage
> to trying to create a reduced functionality SONET framer.
> There are plenty of SONET chips out there and no-one will
> want to redesign and reverify to save a few thousand gates.
>
> We want 802.17 to flow packets through SONET clouds, DWDM
> clouds and dark fiber. Therefore, we want to make sure we
> do not throw away any features of the layer 1 that are
> required to operate in the appropriate environment.
>
>
> With my Cisco Hat on.
>
> SRP does not use K1/K2 or any of the SONET APS signalling.
> It uses the SONET frame as a way to get a PDU from one
> node to the next. Most of our customers prefer SONET to
> GE due to the performance monitoring features.
>
> That being said, SRP can work in a SONET cloud when provided
> with a protected circuit and the SRP protection mechanism
> can be configured to allow Layer 1 to try to protect first.
> We do not encourage this mode of operation and suggest to
> customers that they use unprotected circuits and allow SRP
> to do the protection.
>
> cheers,
>
> mike
>
>
> --
> Michael Takefman tak@xxxxxxxxx
> Manager HW Engineering, Cisco Systems
> Chair IEEE 802.17 Stds WG
> 2000 Innovation Dr, Ottawa, Canada, K2K 3E8
> voice: 613-271-3399 fax: 613-271-4867
>
> > I am new to the group. I have been reading up the presentations. I
have a simple question.
> > We are saying .17 will be layer 1 agnostic. However, (if sonet is the
phy used) sonet is aware of the
> > ring structure - for APS, etc.
> > Will the .17 specify how a sonet framer should be defeatured to work
with a RPR MAC?
> >
> > Thanks,
> > Vasan Karighattam
> > Architect
> > Intel Corporation
> > 9750 Goethe Road
> > Sacramento, CA 95827
> > (916)855-5177 x4907