[61905] in North American Network Operators' Group
Re: OT: converting 100MB to OC-3 POS
daemon@ATHENA.MIT.EDU (Joe Abley)
Tue Sep 9 07:46:52 2003
Date: Tue, 9 Sep 2003 07:45:39 -0400
Cc: Gil Levi <glevi@lynxpn.com>,
"'nanog@merit.edu'" <nanog@merit.edu>
To: Andy Walden <andy@tigerteam.net>
From: Joe Abley <jabley@isc.org>
In-Reply-To: <Pine.LNX.4.44.0309090717230.14635-100000@vision.tigerteam.net>
Errors-To: owner-nanog-outgoing@merit.edu
On Tuesday, Sep 9, 2003, at 08:26 Canada/Eastern, Andy Walden wrote:
> On Tue, 9 Sep 2003, Gil Levi wrote:
>
>> Can anyone help me convert a 100MB Ethernet interface to an OC-3 POS
>> interface in a small cheap box ?
>
> Depends on what you mean by cheap? Ethernet<->POS isn't a conversion
> per
> say, but it could be switched or routed. The more expensive part will
> probably be the POS interface. An RS 1000 would work. Maybe a 7300
> also,
> but it would cost twice as much I think.
>
> http://www.riverstonenet.com/products/router_rs1000.shtml
If it's an interior application, and you are open to alternatives to
POS, you could use a cheap enterprise switch with an ATM uplink and do
RFC1483 bridging. It used to be the case that a cisco 2900XL with a
single OC3 ATM card was way cheaper than the cheapest cisco router that
could do OC3/POS. The 2900XL supported either SDH or SONET framing, if
your application involves a synchronous optical network and not just
dark fibre. You don't need an ATM switch (you can back-to-back the UNI
speakers across the SONET/SDH network).
Note also that "cheap" in "cheap enterprise switch" is relative and,
for the record, ATM is evil.
Joe
