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From: dyer@spdcc.COM (Steve Dyer)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Digital phones for SLIP circuits
Keywords: SLIP, modems, phone-lines, most-cost-effective
Message-ID: <6902@spdcc.SPDCC.COM>
Date: 15 Mar 91 03:20:05 GMT
References: <8204@suned1.Nswses.Navy.MIL>
Organization: S.P. Dyer Computer Consulting, Cambridge MA
Lines: 31

In article <8204@suned1.Nswses.Navy.MIL> efb@suned1.Nswses.Navy.MIL (Everett F Batey II) writes:
>- We have access to a four wire metallic circuit, not conditioned.  Is
>there an economical, recent or old, technology four wire modem YOU USE to
>support 9600 baud SLIP ?

You can go at 19.2K or 9.6K using a pair of Gandalf LDS309A short haul modems.
I used them quite successfully for two years plugged into an Annex
terminal server as my SLIP host until I upgraded to a faster technology.
I've got a pair of them sitting unused here.  Interested?

>- We have some available Telebit modems, no two alike and NO T2500.  Dont
>think any are the newer of V32/V42 which ever that is.  The last neighbor we
>knew using these a 200 mile dialup phone path spent lots of time restarting
>the circuit.  Is there a good way to use these locally over an analog
>delivered voice grade phone line ?

At least the TB2500 has a leased line option (don't recall about the others).
The TB2500 in V.32 mode works well for voice-grade analog leased lines,
but the line turnaround time necessary in PEP mode (all that's available
with the TB+) is not very desirable.

>- How would YOU rate from YOUR PERSONAL experience these options, for cost
>effectiveness and ease ( idiot-proof-ness ) of installation ?

A pair of LDS309A's using a metallic (LADS) circuit comes very close to
idiot proof.

-- 
Steve Dyer
dyer@ursa-major.spdcc.com aka {ima,harvard,rayssd,linus,m2c}!spdcc!dyer
dyer@arktouros.mit.edu, dyer@hstbme.mit.edu