From: robelr@ucs.indiana.edu (Allen Robel)
Subject: Re: WDM and ATM
Reply-To: robelr@mythos.ucs.indiana.edu
Organization: Indiana University
Date: Tue, 15 Dec 1992 18:56:29 GMT

From article <1992Nov30.215429.29379@sics.se>, by craig@sics.se (Craig  
Partridge):
>>From: peterd@pjd.dev.cdx.mot.com (Peter Desnoyers)
>> Secondly, people I've
>> talked to who work with WDM believe that ATM is fundamentally
>> incompatible with the more promising WDM switching mechanisms, due to

> Taking an even wilder viewpoint, there's paper by Cisneros and Bracket  
in
> the October '91 JSAC (pp. 1348-1360) on how to build an ATM switch
> using a WDM switching fabric.

FYI, I got the opportunity to talk with Arturo Cisneros about that
paper and he sent me a corrected version (there were many errors in
the version that appeared in JSAC).  Below is the reference to 
the paper and the corrections that he noted...   -allen

A Large ATM Switch Based on Memory Switches and Optical Star Couplers:
Cisneros, Arturo.; Brackett, C.A.:
Bell Communications Research, 331 Newman Springs Road, Red Bank, NJ 07701:
IEEE International Conference on Communications, ICC '91
Also appears in
IEEE Journal of Selected area in Communications, Vol. 9, No. 8, October  
1991:
:
1991:
721-728, 23.7.1 - 23.7.8:
3 volumes:
:
IEEE Catalog order No. 91CH2984-3, 
Library of Congress Catalog Card No. 81-649547
ISBN 0-7803-0006-8 (Softbound)
ISBN 0-7803-0007-6 (Casebound)
ISBN 0-7803-0008-4 (Microfiche)
Copies may be ordered from
IEEE Service Center
Publications Sales Department
445 Hoes Lane
PO Box 1331
Piscataway, NJ 08855-1331:
We propose a large ATM switch architecture based on memory switches, of  
the type being developed by several research groups, and on optical star  
couplers. Fast contention resolution makes it possible to combine a number  
of these modules, memory switches and optical stars, in order to attain a  
capacity of 2.5 terabit/sec. This switch architecture has a relatively  
small failure group size of 128 STS-3 lines out of a total of 16384. We  
propose failure recovery procedures for all of the components of the  
system. A detailed discussion of current technology for the optical  
interconnect is given. This proposal represents an efficient way to  
combine space and wavelength domain switching. NOTE: In a personal  
correspondence with the author, he points out several errors that the  
publisher failed to remove prior to publication. These are listed next,  
with corrections in parenthesis. Location will be designated with  
page/paragraph (e.g. 1/1 = page 1, paragraph 1). 1/1 "Assuming a  
utilization factor of 105 (Assuming a utilization factor of 10%), 1/6  
"...and m outputs each, mk X k optical star couplers..." (...and m outputs  
each, m k X k optical star couplers), 2/2 "...maintaining it, when  
necessary, allows this switch..." (...maintaining it allows this  
switch...), 2/5 "...while the optical stars can deliver..." (...while an  
optical star can deliver), 2/5 "...provided to the contention CRD..."  
(...provided to the CRD...), 3/1 "The output modules are..." (An output  
module is...), 3/4 "We believe that the number of STS-3c lines (to 128  
lines) that can be switched in this manner may be increased by a factor of  
four with current technology." (We believe that the number of STS-3c lines  
that can be switched in this manner may be increased by a factor of four  
(to 128 lines) with current technology.), 5/3 "The purpose of tuning m  
optical stars..." (The purpose of using m optical stars...), 7/9 "The  
tuning times of these filters are all in the several rms range..." (The  
tuning times of these filters are all in the several ms range), 9/9 "The  
line speed of the fiber banks will..." (The line speed of the fiber links  
will...);
keywords=; ATM; switch; switching; optics; multiwavelength optical  
interconnect; WDM broadcast star network; tunable laser; Fabry-Perot  
filter; Fiber Fabry-Perot; liquid crystal Fabry-perot; BISDN: