aaron@AHKCUS.ORG (Aaron Y.T. Cheung) (04/15/91)
Would appreciate information (cost expectations & contacts info if any) of running a 9600/19200 bps digital (or analog) leased line (satellite or terrestrial) between East Cost and Midwest. In particular, looking for between the Bay Area and Minnesota/Illinois. Any info appreciated; similar references wanted also. Thanks, /aaron. (aaron@ahkcus.org)
larry@nstar.rn.com (Larry Snyder) (04/16/91)
aaron@AHKCUS.ORG (Aaron Y.T. Cheung) writes: >Would appreciate information (cost expectations & contacts info if any) >of running a 9600/19200 bps digital (or analog) leased line (satellite >or terrestrial) between East Cost and Midwest. In particular, looking >for between the Bay Area and Minnesota/Illinois. Well, from South Bend, IN to Indianapolis, IN (a distance of 180 miles) the monthly charges are around $780 - and installation is right at $2000 (for a 9600 baud conditioned leased 2/4 wire line). We use the line to run SLIP (TCP/IP) using v.32bis modems and get excellent throughput (around 3.5kb/sec ASCII/1.6kb/sec binary). Currently we are running stock SLIP from Interactive Systems and have plans to upgrade to PPP slip which should increase the throughput.. -- Larry Snyder, NSTAR Public Access Unix 219-289-0287 (HST/PEP/V.32/v.42bis) regional UUCP mapping coordinator {larry@nstar.rn.com, ..!uunet!nstar.rn.com!larry}
brian@telebit.com (Brian Lloyd) (04/16/91)
In article <1991Apr15.191317.8465@nstar.rn.com> larry@nstar.rn.com (Larry Snyder) writes: >Currently we are running stock SLIP from Interactive Systems >and have plans to upgrade to PPP slip which should increase >the throughput.. Actually PPP as a protocol will not net you any improvement in performance over SLIP. In fact, switching from SLIP to PPP will reduce your throughput slightly because PPP has more overhead (3 to 6 octets per frame depending upon which LCP compression option you have negotiated). If you are running IP only and you are running over a leased line and you are using an async interface to your modem, there is no advantage to switching to PPP. PPP is a win when you are running on a sync link because almost all of the router manufacturers now support PPP as a link protocol. PPP is also a win if you are running on a dial-up link because of the authentication and IP address negotiation/assignment features. If you are looking for performance consider running Van Jacobson's IP/TCP header prediction/compression known as CSLIP. Some implementations of PPP also support VJ compression. -- Brian Lloyd, WB6RQN Telebit Corporation Network Systems Architect 1315 Chesapeake Terrace brian@napa.telebit.com Sunnyvale, CA 94089-1100 voice (408) 745-3103 FAX (408) 734-3333