From owner-freebsd-hackers Tue Mar 19 11:11:46 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id LAA22952 for hackers-outgoing; Tue, 19 Mar 1996 11:11:46 -0800 (PST) Received: from paloalto.access.hp.com (paloalto.access.hp.com [15.254.56.2]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id LAA22923 for ; Tue, 19 Mar 1996 11:11:44 -0800 (PST) Received: from srmail.sr.hp.com by paloalto.access.hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA162492666; Tue, 19 Mar 1996 11:11:06 -0800 Received: from hpnmhjw.sr.hp.com by srmail.sr.hp.com with ESMTP (1.37.109.16/15.5+ECS 3.3) id AA150362665; Tue, 19 Mar 1996 11:11:05 -0800 Received: from mina.sr.hp.com by hpnmhjw.sr.hp.com with SMTP (1.37.109.16/15.5+ECS 3.3) id AA224602664; Tue, 19 Mar 1996 11:11:04 -0800 Message-Id: <199603191911.AA224602664@hpnmhjw.sr.hp.com> To: Greg Lehey Cc: freebsd-hackers-digest@FreeBSD.ORG Subject: Re: ISDN: "modem" or board? (Was: Microsoft "Get ISDN"?) In-Reply-To: Your message of "Tue, 19 Mar 1996 13:52:53 +0700." Date: Tue, 19 Mar 1996 11:11:03 -0800 From: Darryl Okahata Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Greg Lehey 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.