>On Sun, 10 Nov 1996, Carl Oppedahl wrote:
>>
>> Here is a modem init string from PortMaster Version 3.4.2L:
>>
>> Command> show modem usr-v34
>> Short Name: usr-v34
>> Long Name: USR Courier/Sportster V.34
>> Optimal Speed: 115200
>> Type: System Defined
>>
>> Init Script: Send Command Wait for Reply
>> ------------------------------ -----------------------------
>> AT&F1&W\r OK
>>
>> This init string is sent to the modem every time the router is reset, and
>> every time the port is reset, and every time the modem loses carrier.
>
>Ah, no. The init string is NOT sent on every call termination noted by
>DCD drop.
Yes, I am a brand new owner of a Livingston router, and I now have learned
that there is a searchable archive of this discussion group, and I see that
the question came up about half a year ago.
>> The
>> bad thing about this string is the &W, which rewrites the flash EPROM in the
>> modem. The problem is that there is a limited life for any flash EPROM, a
>> limited number of times it can be rewritten. This init string wastefully
>> consumes some of that limited life every time the init string is executed.
>
>The above would be true if the PM sent it every time the carrier dropped.
>If it did we (Livingston) CERTAINLY WOULD NOT put the &w on the string.
Yes, but why do it at all? I don't get it. What benefit comes from adding
the &w to each port reset or router reset? The other parts of the setup
string do their job without the need for &w.
>> It would also be desirable if the init string contained a command to fix the
>> DTE rate. In my setup I am using the modem for dialout, and I want to be
>> sure I get error correction (&m5) and fixed DTE baud rate (&b1). So here is
>> a different init string:
>>
>> at&f1&c1&d2&b1&m5\r
>
>The &f1 sets the hardware flowcontrol template which includes fixed DTE rate.
>The &m5 is something I'll ahve to look at. THANKS!
Yes, the &m5 *forces* the modem to obtain an error-correcting session, which
is foolish not to do in cases where you know that the modem at the other end
of the line is capable of error correction. If we merely did &f1 and not
&m5, the default is &m4 which unfortunately gives the modem permission to
establish non-error-correcting sessions.
>> The complete list of possible USR init commands may be gotten by connecting
>> a terminal emulator to the modem and typing AT$, AT&$, and ATs$.
>
>Or reading the manual.
The AT$ method works even if one doesn't have the manual near to hand.
--- Carl Oppedahl, Oppedahl & Larson, patent law firm http://www.patents.com/ has hundreds of pages of answers to frequently asked questions on patent, copyright, and trademark law