Re: K56Flex vs. X2 (Boardwatch article)

Michael Whisenant ( )
Wed, 25 Mar 1998 19:34:40 -0600

Actually the real issue is in the local loop. We have worked with
BellSouth, Seimens, Nortel, Lucent, USR and found several keys in how to
improve the chances of reliable 56K connections. Like if the subscriber
line is build out at less than 3db what steps to take, vs a customer site
that is over 10db loss. We actually will go on-site with very expensive
test equipment (on loan from Lucent) and run testing, then provide the
customer the information to connect reliably. The key is finding an
engineer that can explain PCM to you and help you understand the technology
and the weaknesses. But with all that aside, since the USR allowed greater
modification to the power output and other key settings, we got rid of our
MAXs. We have challenged any local, regional, or national ISP to
outperform our connect and throughput speeds and no one took our challenge.
The regional or national could not really afford at 19.95 to match our
level of service, and the other locals decided not.

At 01:02 PM 3/25/98 -0500, you wrote:
>> From: rkm <>
>> I also like the ASCEND MAX but just read an article at the BOARDWATCH
>> where the X2 series (supported by the 3com/USR product) regularly
>> 40k+ connections but the Kflex modems rarely got over 35k.
>This isn't being directed to you, RKM, but you brought up something that I
>think everyone who deals with 56k (K56Flex, X2, or V.90) ought to
>read--especially because it concerns the Boardwatch article that you
>I received this letter as snail-mail last week and I guess a few days later
>Rockwell Semiconductor Systems put it on their website.
>We have 3 Ascend Maxes (4004, 4048, 4002); two of which are K56Flex (6.0.0
>and K56Flex version 1.160). The 4002 is V.34 unfortunately.
>The highest initial connection speeds that we've logged are 48000 bps. If
>we were to go into some other city, they might be higher; they might be
>lower. The phone companies' phone lines have a great deal to do with
>connection speeds and reliability. In some areas K56Flex is better than
>X2; in others, it's the other way around.
>Josh Hillman
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