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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: long distance gigabit ethernet
The new 15540 is a much better box, not much more $ either. There are some other people making extremely killer products, ONI being one that is very popular. I wouldn't invest in a 15454 anymore with all the new products out there, we still use them, but anything new will be a better box. > -----Original Message----- > From: Barton F Bruce [mailto:[email protected]] > Sent: Friday, March 22, 2002 5:17 PM > To: Antony; Greg Pendergrass > Cc: Richard A Steenbergen; '[email protected] Edu' > Subject: Re: long distance gigabit ethernet > > > > The Cerent 454 (now cisco 15454) has 2 port Gig-E cards that > cost a little > more than a PA-GE card. The pair of ports shares OC-12 > available to that > slot (I'm assuming this is NOT an OC-192 equipped shelf) and > the bandwidth > can be split in certain multiples of STSes (OC-1), or used > totally for one > port. You only need as many STSes between boxes as you want to use. > > You can play some nice games with 802.1Q VLANs and multiple > sites, too. > > There is a newer 4 port Cerent gig-E card I have not seen, > but that probably > can do a FULL gig-E on at least 2 of the ports (i.e. use a > full OC-48 if the > box has the OC-192 cross connect matrix installed). This > newer card I think > is only for point to point and does not "understand" VLANS, > though probably > can carry them. > > Some DWDM boxes have their own gig-E ports. We have Sycamore > ones that give > us several Boston, NYC, and Reston routers on the same ethernet. > Consider also that many switches support what cisco calls > ether-channel. If > one gig-E isn't enough, add more in parallel. Any router on > this "ethernet" > can freely talk to any other. > > You are not stuck with just one router talking to one at the > other end. > > ----- Original Message ----- > From: "Antony" <[email protected]> > To: "Greg Pendergrass" <[email protected]> > Cc: "Richard A Steenbergen" <[email protected]>; "'[email protected] Edu'" > <[email protected]> > Sent: Friday, March 22, 2002 12:28 PM > Subject: Re: long distance gigabit ethernet > > > > > > On Fri, Mar 22, 2002 at 11:54:05AM -0500, Greg Pendergrass wrote: > > > > > > I'm going to take a stab and assume that you're actually > more interested > > > in finding a longhaul line with GigE on the ends, and not > so much how > many > > > miles you can get with whatever optics... > > > > > > Absolutely right, I don't care what's in between as long > as I have GigE > at > > > the end. Other options include using wave (too > expensive), or ethernet > over > > > MPLS (worth considering although latency may be too high > for longer that > > > 1000 miles). > > > > there are solutions of this type. SURFNet line, currently > used for test > > and network research is an example. > > It is from Amsterdam to Chicago. It is presented as GigE at > the ends. > > > > So fairly long distance, RTT is 93 msec.Actually it terminate as > > SONET OC48 that goes too TDM Switch which has GigE interfaces. > > So there is SONET encapsulation in the middle. In theory we can get > > upto 2.5Gbps. > > > > Line is provided by Teleglobe. End equipements are > > CISCO, ONS 15454. This don't do any routing. > > > > This page may be interesting to browse. > > http://carol.wins.uva.nl/~delaat/optical/index.html > > > > You can probably find different variants of such non > standard technology > > from other carriers. > > > > -antony > > > >
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