Aucbvax.2603
fa.info-terms
utzoo!decvax!ucbvax!info-terms
Mon Aug 10 16:10:19 1981
[DREIFU: High Speed direct connect modems.]
>From RAM@MIT-MC Mon Aug 10 15:45:18 1981
Date: 10 Aug 1981 (Monday) 1555-EDT

  Re:   High Speed direct connect modems.

  Rockwell Intn'l is moving along very well in this field.  They had
  at NCC'81 a demonstration of their 4800 and 9600 direct connect
  modems (sorry - no accoustic), running on unconditioned telephone
  lines.  It is impressive.

The limiting factor on telco lines is probably the relay and switchinng
equipment, not the cable bandwidth. It would be interesting to know
how far and through how much of the dial network these demos were.
An unconditioned private linne might support 9600 baud at aprreciably greater
distances than the ddd.

An excellent work on the whole subject is "Technical Aspects of Data
Communications", by John McNamara, published by Digital Press. His
advice is basically don't count on an unconditioned line to remain
satisfactory even if it starts out so, because the telco will have no
obligation to keep it at any particular bandwidth.





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