Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!unido!alderan!chris
From: chris@alderan.uucp (Christoph Splittgerber)
Newsgroups: comp.dcom.modems
Subject: Slow T2500 transfer with long distance calls
Keywords: Trailblazer, T2500, PEP
Message-ID: <356@alderan.uucp>
Date: 11 Mar 91 11:47:31 GMT
Organization: C. Splittgerber Datentechnik, Denkendorf, Germany
Lines: 59

This uucp-side uses a T2500 for its mail/news - links and everything
works just fine with about 1400 char/sec.

However, when I do very long distance links (e.g. to the USA) in PEP
modus, my Trailblazer does behave very strange. I understand that I
should not expect 1400 char/sec but just imagine this:

1) I get the CONNECT/FAST/UUCP
   I send <CR>
2) I get the half of the announcement from the remote host. E.g:

   University of Whatever, Public Access Un

3) Then a very strange delay for about 30 sec.
4) Then the second half of the announcement from the remote host. E.g:

                                           ix System
   Login as guest or nuucp
   login:

5) I sent nuucp
6) Another strange delay
7) Several of those delays happen during protocol negotiation. And I see
   several "alarm 1, alarm 2, alarm ..."
8) Once the file transfer is started those long delays are gone. But the
   transfer rate drops to about 300 char/sec. :-(

I have seen this also when I don't connect with /UUCP e.g. when I just
login a BBS in PEP-Modus. To me, it looks like that the modem(s) are
buffering data, and don't transmit or retransmit the data as long their
buffer is not full or some long timeout value (+30 sec.). I know that
this sounds stupid, but that's the way it looks like.

Like I said, this only happens when I call a host in the USA. All my
PEP connections here in Germany run just fine.

Just because it might be something obvious, I include my register
settings:

E0 F1 M0 Q8 P V1 W0 X3 Y0 &P0 &T4     Version GE6.01-T2500
S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=040 S08=002 S09=006
S10=007 S11=070 S12=050 S18=000 S25=005 S26=000 S38=000
S41=000 S45=000 S47:100 S48=000 S49=000
S50=000 S51:254 S52:002 S54:002 S55=000 S56=017 S57=019 S58:002 S59=000
S61=150 S62=003 S63=001 S64=000 S65=000 S66=000 S67=000 S68=255 S69=000
S90:001 S91=000 S92:001 S93=008 S94=001 S95=000 S96=001 S97=000 S98=003
S100=000 S101=000 S102=000 S104=000 S105=001 S106=000 S107=020
S110:001 S111:030 S112=001
S121=000 S130:003 S131:001

S150=000 S151=004 S152=001 S153=001 S154=000 S155=000
S160=010 S161=020 S162=002 S163=003 S164=007 S255=000

Any ideas ?
             Chris
-- 
************************ Brain fault (core dumped) *************************
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