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Re: [EFM] Network timing, ATM, ADSL/VDSL and EFM


What I am looking at are several separate factors.  The existing T1/E1 
CSU/DSU logic is provided as a single "chip" from vendors, which means that 
technology can be further reduced in price by the increased production and 
yield of a more commodity market.  T1/E1 framing is old technology that 
already provides some of the OAM requirements for supporting the physical 
infrastructure of an extensive diversity of services offerings.  ( Where I 
am, I can get T1 bandwidths over DSL into my home from my DSL ISP, but 
today I have to run ATM to do it. )  This means that the PHY level framing 
technology can be adopted to new applications, particularly when used over 
the new copper and optical signaling technologies.  For those silicon 
device vendors that are used to supporting the "service provider" market, 
this is not new "stuff".  Adding some functionality for supporting minimal 
additional requirements over the higher bandwidth technologies should not 
be that difficult either.  Once the PHYs are defined properly, how the 
different "box" vendors use that functionality will depend on the market 
sector that each will be targeting.

Thank you,
Roy Bynum

Borrowing functionality from technology that already supports the require

At 11:09 PM 10/2/01 -0400, Matt Squire wrote:

> > It is also inexpensive.  A  T!/E1 CSU today costs less that what a GbE SMF
> > PCI card does.  If it had the commodity market that 10/100Mb Ethernet does,
> > it would probably have much the same pricing, or lower.
> >
>I have to question this expense argument.  You're saying that a 1.5Mbps
>copper T1 device costs less then a 1Gps fiber/optical component.  Fine,
>but I'm not sure why that's compelling.  If we tried to make that same
>device run 650 times faster and use optical components as a GbE SMF,
>would that price comparison would hold up?  I don't have any hard data
>to pull out, but I'm guessing it wouldn't.
>- Matt