Path: utzoo!utgpu!water!watmath!onfcanim!dave
From: dave@onfcanim.UUCP (Dave Martindale)
Newsgroups: comp.dcom.modems
Subject: Re: Telebits: what's going on?
Message-ID: <16018@onfcanim.UUCP>
Date: 3 Sep 88 04:25:15 GMT
References: <1776@spdcc.COM>
Reply-To: dave@onfcanim.UUCP (Dave Martindale)
Organization: National Film Board / Office national du film, Montreal
Lines: 23

In article <1776@spdcc.COM> dyer@spdcc.UUCP (Steve Dyer) writes:
>My UUCP sez in its SYSLOG: sent data 9212 bytes 5.00 secs, but the UUCP on the
>other end sez:         received data 9212 bytes 49.93 sec
>
>I wondered why things were running so slowly...

From a few informal experiments, it seems that a pair of Trailblazers
operating in PEP mode are willing to buffer something like 20 Kb of data
in the two modems before flow-controlling the source.

So, it took just 5 seconds for the originating telebit to eat and
acknowledge all 9212 bytes, at which point the originating uucico thinks
they've all arrived at the destination (after all, it acknowledged them
didn't it?)

Meanwhile, on the receiving end, it took 50 seconds to get the bytes
from the modem into the host.  What bit rate was that port running
at anyway?

For Trailblazers, only the receiving side gets a true idea of the
transmission rate.  Even when sending 100 kbyte files, there will be
a significant difference in the rates reported by the sending and
receiving end.