Robotics Sportster Flash x2 Instrukcja Użytkownika Pobierz pdf

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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Podsumowanie treści

Strona 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

Strona 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

Strona 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

Strona 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

Strona 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

Strona 6 - Sportster 56K

Strona 7 - Other Important Values

Strona 8 - Troubleshooting x2 Servers

Strona 9

Strona 10

Strona 11

Strona 12

Strona 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

Strona 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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