I would argue no. The Class 5 softswitches that are around now are off-the-shelf cPCI or ACTA hardware running Linux or some other *nix. The TDM -> IP cards are the only sticky point there to be upgraded, but since everything is a mid-plane, you can do rolling N:1 upgrades across the cards with minimal (sub 400msec) impact. There's not a ton special secret sauce there..
To the other point, they probably process way more than 2mbps/s of control traffic during busy hour, especially in geo-redundant configurations as lots of things have to be synchronized. I think you're talking more on the order of 50-120mbps.. Yet all of this works pretty damn well. -- Tim On Mon, Nov 12, 2012 at 12:21 AM, Kasper Adel <karim.a...@gmail.com> wrote: > Hi Frank, > > Is it because C5 softswitches have expensive hardware, advanced software > and dual asics? I would have never imagined that any vendor is capable of > upgrading fpd's/ASICs ucode without a hit unless there are multiple chips > continuously syncing with each other. > > Regards, > Kim > > On Monday, November 12, 2012, Frank Bulk wrote: > > > We do it on our Class 5 softswitch ... and it works consistently. There > > may > > be a few seconds, once, where a new call can't be made, but most people > > will > > re-dial. It just works. > > > > It can be done, but the product has to be built with that in mind. > > > > Frank > > > > -----Original Message----- > > From: Kasper Adel [mailto:karim.a...@gmail.com <javascript:;>] > > Sent: Thursday, November 08, 2012 5:23 PM > > To: NANOG list > > Subject: Whats so difficult about ISSU > > > > Hello, > > > > We've been hearing about ISSU for so many years and i didnt hear that any > > vendor was able to achieve it yet. > > > > What is the technical reason behind that? > > > > If i understand correctly, the way it will be done would be simply to > have > > extra ASICs/HW to be able to build dual circuits accessing the same > memory, > > and gracefully switch from one to another. Is that right? > > > > Thanks, > > Kim > > > > > > >
