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Busca en linea o descarga Manual de usuario para Redes Robotics Sportster Flash x2. Understanding the Issues/ Troubleshooting Problems Manual de usuario

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Version 1.0 - June 19, 1997 1997 U.S. Robotics - All Rights Reserved
Understanding the Issues/
Troubleshooting Problems
Testing has shown that a vast majority of analog lines in the U.S., Europe and the
Pacific Rim will support x2, but certain conditions in the network or the local loop may
prevent x2, either intermittently to a certain destination or at any time from certain
analog lines.
This paper explains the circumstances under which x2 speeds cannot be achieved and
gives troubleshooting advice. It is intended to help the majority of customers whose lines
can support x2 speeds and to impart an understanding of why a small minority cannot
achieve x2 speeds.
Expectations
Currently, due to restrictions set on the output power allowed in the U.S., Canada and
other countries, the maximum speed is bounded at 53.3 Kbps. Support for 56 Kbps (and
above) is contained within the code, but server code being shipped today is restricted to
53.3 Kbps. U.S. Robotics and others are endeavoring to have these regulations
modernized, so this restriction may be removed in future releases.
Certain line conditions and network configurations also produce impairments that may
restrict the actual rates achieved, with x2 just as with V.34 (and V.34+). As of today, the
majority of users are probably finding their connect rates in the 46-48 Kbps range. Very
few (we believe less than 5 percent) will not achieve x2 speeds at all. This paper is
intended to help the 95 percent get x2 running as it should, and to impart an
understanding of why those 5 percent do not achieve x2.
It should also be understood that there will be continuous improvements made to the
code, and it is quite possible, if not likely, that future code releases will increase
performance and reduce the occurrences of x2 not functioning in certain environments.
Requirements
x2 requires the following:
1. A digital connection at one end.
One end of an x2 connection must terminate at a digital circuit, meaning a "trunk-side"
channelized T1, ISDN PRI, or ISDN BRI. Line-side T1 will not work because an extra
analog section is added. In a trunk-side configuration, once the user’s analog call is
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Indice de contenidos

Pagina 1 - Troubleshooting Problems

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedUnderstanding the Issues/Troubleshooting ProblemsTesting has shown that a vast m

Pagina 2 - The Telephone Network

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reservedn Send ATI4I6I7I11Y11again after 45-60 seconds online. This will show the true“s

Pagina 3

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedAppendix A - Courier x2 Status MessagesThese messages come from the x2 status fi

Pagina 4 - Troubleshooting Courier Calls

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedTHE FOLLOWING ARE SERIOUS ERRORS. IF YOU SEE THEM PLEASE CALLU.S. ROBOTICS TECHN

Pagina 5 - Sportster Flash

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedAppendix B - Enabling x2 in USR ProductsWith the exception of products shipped a

Pagina 6 - Sportster 56K

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedAppendix C - Glossaryanalog-to-digital converter (ADC)A device that samples inco

Pagina 7 - Other Important Values

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reservedconverted to digital and sent through the carrier’s network, the call stays digi

Pagina 8 - Troubleshooting x2 Servers

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reservedequipment located in the neighborhood. In many cases it is provided as a digital

Pagina 9

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reservedscreens from a call to a known good x2 host from that line. Call U.S. Robotics t

Pagina 10

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reserved1. Examine the Courier status messages.From a terminal screen, call an x2 server

Pagina 11

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reserved4. Ensure that the S-registers are set properly.For troubleshooting and other co

Pagina 12

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedHigh-End RolloffExamine the values of 3300 and 3750 from the Y11 screen. These v

Pagina 13 - Sportster 128 ISDN

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights ReservedTroubleshooting x2 Servers(Courier I-modems and Total Control Quad Modem Cards)T

Pagina 14 - Appendix C - Glossary

Version 1.0 - June 19, 1997  1997 U.S. Robotics - All Rights Reserved3. Ensure that the S-registers are set properly.As with the clients, there are a

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