bdb@becker.UUCP (Bruce Becker) (05/02/89)
This message is a question for Telebit Trailblazer sites: In high-speed mode the Trailblazer can support several asynchronous protocols. It has been my understanding that the correct configuration for modems was to indicate general protocol support (S111=255) on autoanswer, and to specify which, if any, protocol was to be used (S111=30 for uucp) when dialling out. Recent experience shows that it is possible that not all sites adhere to this convention, but instead use S111=255 for both answer & dialling out, or else S111=30. Earlier on, I had been using S111=30, but changed over to the above description. However I have come across some sites which default to S111=255, which means that no protocol support ends up being negotiated. In the case of uucp calls, this results in a quite significant loss of throughput. I'm soliciting whatever commentary & discussion is warranted on this topic... -- __ Bruce Becker Toronto, Ont. w \cc/ Internet: bdb@becker.UUCP, bruce@gpu.utcs.toronto.edu `/v/-e BitNet: BECKER@HUMBER.BITNET _< >_ "Where is Newton Minow now that we need him?" - T. S. Eliot
lyndon@cs.AthabascaU.CA (Lyndon Nerenberg) (05/04/89)
For the sites I administer I use the following configuration:
Default state (forced by DTR dropping) is to set register
50 to 0, and register 111 to 255. This allows the modem to
handle speed conversion on dialup, and allows the caller to
specify whatever protocol support they require.
On uucp dialouts, the modem chat script includes the commands
to set 50=255 and 111=30 for PEP connections. This is simple
in HDB uucp (using the Dialers entry), but it's also easy for
v7 uucp's:
foo Any ACU 9600 15551212;s50=255;s111=30;d ogin: ...
Of course if your v7 uucico likes to treat ';' as a delay character
(did someone say Ultrix?) you are SOL unless you have source, or like
editing binaries with emacs (which isn't as hard as it might sound in
this case - in the Ultrix 1.2 uucico the character ';' only appears in
five places that are likely candidates - you get to guess which one
it is :-)
[ Something else: turn OFF flow control. ALL of it! ]
--
Lyndon Nerenberg Computing Services Athabasca University
{alberta,attvcr,ncc}!atha!lyndon || lyndon@nexus.cacks@ziebmef.uucp (Chris Siebenmann) (05/04/89)
In article <465@becker.UUCP> bdb@becker.UUCP (Bruce Becker) writes: | Recent experience shows that it is possible that not all | sites adhere to this convention, but instead use S111=255 | for both answer & dialling out, or else S111=30. S111=30 for dialin and dialout should be no problem with uucp connections; they always get the high-speed mode. People with S111=255 on dialout should be gently told that there's an easy way to vastly improve their uucp performance; you can also make a point of calling them instead of vice versa. I wouldn't worry about the performance loss unless they're tying up a lot of your modem time. -- "Oh BLESS you, sir! The ANGEL OF DEATH was after me just as SURE as you're standing there, yes he WAS!" Chris Siebenmann uunet!{utgpu!moore,attcan!telly}!ziebmef!cks cks@ziebmef.UUCP or .....!utgpu!{,ontmoh!,ncrcan!brambo!}cks