Re: USR TC vs. PM3 Test results
Karl Denninger (karl@Mcs.Net)
Wed, 21 May 1997 15:06:54 -0500
On Wed, May 21, 1997 at 11:25:50AM -0700, Marty Likier wrote:
> At 12:22 PM 5/21/97 -0500, PM Mailing List wrote:
> >
> >U.S. Robotics Total Control Enterprise Network Hub
> > and Livingston PortMaster 3
> > Comparison Results Overview
> >
> >http://www.usr.com/business/30409_d.html
> >
> >I thought this might prove to be an interesting link. Any one have any
> >comments? According to the test results, the PM3 fails miserably early on
> >while the Ascend 4004 performance degrades slowly, while the TC (of
> >course, this is on USR's home page) runs no problemo.
>
> Here is my take on it. (BTW, where do you see a Ascend mentioned in this
> report?)
>
> 1. Not surprisingly to me, the XXCAL report clearly documents that the
> Livingston PM3 out performed (in total combined thru-put) the USR TC
> chassis, at every point from a single user all the way up to 17 concurrent
> users. The USR TC chassis ** never once ** uploaded or downloaded files in
> speeds greater than 7000 bytes per second. The PM3 ** consistently exceeded
> ** 7000 bytes per second, in every instance, from a single user all the way
> up to 17 concurrent users. Thank you USR for substantiating what we are
> ready knew. ;-)
>
> 2. USR would have the reader believe that the PM3 reached a saturation
> point at 17 concurrent users and could not process any more dial-in
> connections beyond 17. This is a blatant misrepresentation of the truth.
> The real reason the PM3 did not go beyond 17 concurrent users is that the
> PM3 experienced a compatibility problem with a Teleos Model 60 phone line
> simulator. This compatibility problem resulted in the PM3 terminating calls
> and ** does not ** represent any under achieving in performance.
>
> 3. This test was performed on a test bed, not using real-world using AT&T
> or Nortel switches, but a simulator. And I know most of you all run your
> networks on phone line simulators, just like the one in the report. ;-)
> --
> Marty Likier
> Product Marketing Mgr.
> marty@livingston.com
FYI, the best performance I have ever recorded on a dial connection was
through a PM3, transferring the /usr/lib/news/active file (highly
compressible) and it repeatedly can be transferred here at 9970 cps.
Even "X-socalled-2" can't get to that level of performance.
--
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