From: jessea@homecare.com (Jesse W. Asher)
Newsgroups: comp.dcom.modems
Subject: Optimizing Telebits.
Date: 6 Sep 92 13:50:28 GMT
Organization: G.O.D Inc.

I've had Telebits for quite some time and I've never really understood
how to optimize their performance.  I've got a WorldBlazer now and I'm
just getting lousy throughput.  I'm getting better thoughput using
V.32 than with PEP.  For example, I'm connected right now to a site
with Trailblazers running in PEP and I'm getting a little less than
500bps.  That's terrible!

Here's a couple of related issues:

1)  Someone from Telebit once told me that in order to use UUCP
spoofing you had to have MNP enabled.  This seems sort of wierd to me
considering that you have to have it turned off when the non-Telebit
world calls you or ye ole g protocol will not like life very much.  Is
this correct?  Is it silly to have S111=30 when MNP is disabled?  If I
have to enable it for the Telebit world, how can I deal with it being
enabled with the non-Telebit world?

2)  When my WorldBlazer is chugging away and seems to be moving at a
good clip using PEP, it suddenly will stop and just sit there doing
absolutely nothing for between 8 and 10 seconds.  Then the transfers
start up again.  I've seen uucico say that a bad packet was received
at that point so I'm sure that is what is causing it.  But why does it
take so long to start back up?  Why does it even stop in the first
place?  You would think that the side receiving the bad packet would
just immediately send back a message asking the other end to retransmit.
What can I do about this incredibly long delay.

3)  I'm using SVR4 and I've tried to manipulate the window and packet
sizes without any apparent differences.  I've heard that you can
change the window size and not the packet size for the g protocol and
that you can change both for the G protocol.  I only have a couple of
SVR4 sites I talk to, so what should I be setting things for both the
g and G protocols to improve performance.

4)  And last - this is just a little pet peeve.  For some reason these
WorldBlazers think they need to retrain when they lose the modem on
the other side.  The other end will cut off the connection and the
WB's CD light starts blinking like it is retraining.  How can I stop
this from happening?  I wan't the damn thing to hang up and not wait
10 seconds while it figures out the line has been dropped.  I've seen
no other Telebits do this and it is aggravating to have this one do
it.


I've often wondered what undocumented registers the Telebits have in
them to improve performance and how they work.  Does anyone have such
a listing or know how I can get it?

Wheh!  That was a long one.  Anyway, I'd appreciate any help with this
as more sites are interested in getting newsfeeds and I'm starting to
run out of time during the day to get everything transferred.  It's
not due lack of time per se, but really in these  ineffecient
transfers.  Thanks.
-- 
      Jesse W. Asher                                   Phone: (901)762-6000
                         Varco-Pruden Buildings
	      6000 Poplar Ave., Suite 400, Memphis, TN  38119
 Internet: jessea@homecare.COM                 UUCP: ...!banana!homecare!jessea
Newsgroups: comp.dcom.modems