Cell Relay Archive

[Baris Aksoy <baris.aksoy@gte.net>]

Hello,

As for the chronology of the UTOPIA standard by ATM Forum:

1. SCI-PHY(Saturn Compatible Interface for ATM devices) (1993)
2. UTOPIA Level 1 (1994)
3. SCI-PHY Level 2 (1995)
4. UTOPIA Level 2 (1995-1996)

Then POS-PHY(SCI for POS devices), used SCI-PHY and Utopia Level 2 standards
as the basis. Indeed, POS-PHY defines the i/f between SONET/SDH PHY and link
layer devices, which can be used to implement several packet-based protocols
like HDLC and PPP.

However, SCI-PHY is the interface for ATM devices, which is very similar to
UTOPIA i/f.

You can find detaild info about both of the i/f doc. in www.pmc-sierra.com.

Baris

Tim Dwight wrote:

> The UTOPIA specifications come from the ATM Forum.
> Utopia Level 1 is in af-phy-0017.000, L2 is in
> af-phy-0039.000.  Both are available at http://www.atmforum.com.
>
> The Saturn group owns the POS-PHY spec, which is more
> or less an equivalent interface for HDLC-framed interfaces.
> Maybe that's what you're thinking of.
>
> Of course many Saturn group members are also ATM Forum
> members.  I don't know the extent to which they were involved
> in definition of the Utopia specs.
>
> tim
>
> Baris Aksoy <baris.aksoy@gte.net> wrote in message
> 387C16FE.37C58E60@gte.net">news:387C16FE.37C58E60@gte.net...
> > Hi,
> >
> > As far as I know, Saturn group was the originator of the UTOPIA L1 and
> then
> > L2. However, ATM froum didn't except them as it was. There're few
> differences
> > between them in terms of the # of PHY's they support, etc.
> >
> > Baris
> >
> >
> >
> > Michael McGarry wrote:
> >
> > > Does anyone know who made the proposal for the UTOPIA L1 and L2
> standards?
> > > Was it the SATURN group?
> > >
> > > Regards,
> > >
> > > Michael McGarry
> >
> >
> >