Ascend Archive
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RE: (ASCEND)Help-Connect Speeds-56K
56K isn't illegal, per se. USR's implementation of x2 suffers from
(simply stated) the ISP end equipment sending to high an output into the
PSTN, exceeding current FCC and telco spec'd levels for input, when
connecting at rates above 53K. The USR Total Control therefor limits
its sending rate to a maximum of 53K. The Rockwell/Lucent spec employs
a slightly different algorithm for this, and is not affected (at least
publicly known or advertised) at this time.
See the white papers on both technologies for a more in-depth discussion
of this, but expect to see the USR limitation removed in the near future
as the delta to make 56K Vs 53K is negligible and arguably not an issue.
Best regards,
David Van Allen - You Tools Corporation / FASTNET(tm)
dave@fast.net (610) 289-1100 http://www.fast.net
FASTNET - PA/NJ/DE Internet Solutions
>-----Original Message-----
>From: Richard Johnsson [SMTP:johnsson@interval.com]
>Sent: Thursday, June 26, 1997 12:30 PM
>To: Greg Hale
>Cc: Ascend Users
>Subject: Re: (ASCEND)Help-Connect Speeds-56K
>
>Currently 56K is illegal. The max you can get within FCC regulations is
>53K. I've only made a few tests (with a Supra 56K) and the best I have
>personally seen is 50K on an analog line in the same CO as our PRI; 48K
>from across town.
>
>At 08:37 AM 6/26/97 -0500, Greg Hale wrote:
>>Mailing list newbie here.
>>Just wondering if anyone has gotten a 56K connection.
>>We installed two Max4048's with 56K modems to replace old Multitech modems.
>>Connect speeds dropped.
>>Analog modems gave us many 33,600 and 31,200 connections but now we get
>>28,800 with a rare 31,200. Yet to see a 33,600. I think this is normal
>>from what I've heard.
>>Modem(AT &V1) reports that line quality on the analogs about 20 while new
>>modems 127.
>>We're bringing in channelized T1's from a Nortel DMS-10 and the codec or
>>the trunks must be adding "noise", maybe?.
>>Have had a few problems with disconnects, especially the USR Sportsters.
>>New Hayes and Zoom 56flex modems would not even connect until we gave the
>>additional string +ms=11,1 to force them to run at v.34.
>>
>>Any help or suggestions or just getting brought up to speed would be
>>appreciated since I can't find the archive,
>>Thanks,
>>Greg Hale
>>greghale@logantele.com
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>>
>>
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