Date: Tue, 19 Mar 1996 11:11:03 -0800 From: Darryl Okahata <darrylo@hpnmhjw.sr.hp.com> To: Greg Lehey <lehey.pad@sni.de> Cc: freebsd-hackers-digest@FreeBSD.ORG Subject: Re: ISDN: "modem" or board? (Was: Microsoft "Get ISDN"?) Message-ID: <199603191911.AA224602664@hpnmhjw.sr.hp.com> In-Reply-To: Your message of "Tue, 19 Mar 1996 13:52:53 %2B0700."
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Greg Lehey <lehey.pad@sni.de> wrote:
> Darryl says that an Ascend P50 can peak 42 kB/s. That seems
> reasonable with builtin compression. How many B channels?
Please take what I said with a small grain of salt, as this is only
one data point. I mumbled, "... an Ascend P50 can transfer a
518694-byte /etc/hosts file in 12 seconds, for around 42Kbytes/sec ...".
This is with two B channels (the second B channel was already connected
when the transfer occurred, and was not established during the
transfer). The transfer was also done using ftp, and the reported time
was the (elapsed stopwatch) time reported by ftp.
If someone wants to point me to some suitably large files, I'd be
willing to do a few more transfer tests.
> Is this
> rate sustainable?
Given similar data, I'd say that this rate is sustainable (this was
done over a 12-second period), but you've got to remember that we're
doing compression here; the compressibility of the data directly affects
the "sustained" transfer rate. I used a very compressible ~8000-line
/etc/hosts files with lines like:
########################################################################
# 15.14.138.0 Do Not Use
15.14.138.1 asc0062 asc0062.sr.hp.com # Ascend box [no mx]
15.14.138.2 hostigos hostigos.sr.hp.com # Pentium, Darryl Okahata [no mx]
15.14.138.3 rylla rylla.sr.hp.com # Pentium, Darryl Okahata [no mx]
15.14.138.4 kalvan kalvan.sr.hp.com # Pentium, Darryl Okahata [no mx]
# 15.14.138.7 Do Not Use
########################################################################
The "#" comments occur frequently, as do the phrases "Do Not Use" and
".sr.hp.com" (aliases like "kalvan.sr.hp.com" are useful for brain-dead
Windows-based PCs).
-- Darryl Okahata
Internet: darrylo@sr.hp.com
DISCLAIMER: this message is the author's personal opinion and does not
constitute the support, opinion, or policy of Hewlett-Packard, or of the
little green men that have been following him all day.
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