Interesting People mailing list archives
Re: NSF and the Birth of the Internet
From: David Farber <dave () farber net>
Date: Wed, 20 Aug 2008 16:36:27 -0400
Begin forwarded message: From: Seth <sethb () panix com> Date: August 20, 2008 4:25:16 PM EDT To: dave () farber net Cc: steve () shinkuro com Subject: Re: [IP] NSF and the Birth of the Internet Steve Crocker <steve () shinkuro com> wrote:
Western Electric series 303 modem. 12 voice grade lines multiplexed to achieve 50,000 bits per second.
Conditioned voice-grade lines. In those days, if you claimed you couldn't get 300 baud on a voice-grade line, they'd tell you that such lines were rated at 110 baud, and you needed to pay for a better grade if you wanted 300.
(Not 56Kbps. 56Kbps came later when digital lines came along.)
Thank you. I remembered 50,000 (from my days at BBN), but everyone else kept claiming 56K.
They partitioned the eight bit field into a six bit IMP address and a two bit host address, so the maximum number of sites was 63. (I don't think 0 was a permitted address, but I don't recall why.)
IMP 0 was the Network Control Center (a PDP-1, IIRC). It ran special software. Back in those days (early 1970's), ATT Long Lines didn't like to believe us when they got a phone call from Cambridge MA telling them that a line in California was down. They didn't see how we could possibly know that. Seth Breidbart ------------------------------------------- Archives: https://www.listbox.com/member/archive/247/=now RSS Feed: https://www.listbox.com/member/archive/rss/247/ Powered by Listbox: http://www.listbox.com
Current thread:
- Re: NSF and the Birth of the Internet, (continued)
- Re: NSF and the Birth of the Internet David Farber (Aug 19)
- Re: NSF and the Birth of the Internet David Farber (Aug 19)
- Re: NSF and the Birth of the Internet David Farber (Aug 19)
- Re: NSF and the Birth of the Internet David Farber (Aug 19)
- Re: NSF and the Birth of the Internet David Farber (Aug 19)
- Re: NSF and the Birth of the Internet David Farber (Aug 20)
- NSF and the Birth of the Internet David Farber (Aug 20)
- Re: NSF and the Birth of the Internet David Farber (Aug 20)
- NSF and the Birth of the Internet David Farber (Aug 20)
- Re: NSF and the Birth of the Internet David Farber (Aug 20)
- Re: NSF and the Birth of the Internet David Farber (Aug 20)