Fiber: Single or Multimode?

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3 total messages Started by Brian A. Wolfe Wed, 16 Dec 1992 23:28

#288

Author: Brian A. Wolfe
Date: Wed, 16 Dec 1992 23:28

28 lines
1378 bytes

Hi there,

I'm involved in a project that requires putting in a fiber backbone
for a very large campus, we've talked about putting in 144 strands of
62.5 micron multimode fiber between buildings, but I'm wondering if 
its worth including single-mode fiber as well.

Can anyone give me examples of applications that would require
single-mode fiber which could not be accomplished with multi-mode
fiber (videoconferencing??)? Also, should I be concerned about 
requesting specific grades of multi-mode fiber? (I have heard of 
"fddi grade", are there others?)

Thanks in advance,

Brian



-------------------------------------------------------------------------
Brian Wolfe						
Associate Director
Dept of Diagnostic Radiology and Nuclear Medicine
Rush Presbyterian-St. Lukes Medical Center 
Chicago,  IL   USA 
Internet: bwolfe@rad.rpslmc.edu    
Voice:    (312)-942-2141          FAX:  (312)-942-2114

Re: Fiber: Single or Multimode?

#293

Author: Richard M. Kogut
Date: Fri, 18 Dec 1992 15:02

20 lines
1567 bytes

In article <1992Dec16.232821.13003@rpslmc.edu> bwolfe@rad.rpslmc.edu (Brian A. Wolfe) writes:
>From: bwolfe@rad.rpslmc.edu (Brian A. Wolfe)
>Subject: Fiber: Single or Multimode?
>Date: Wed, 16 Dec 1992 23:28:21 GMT
>
>Hi there,
>
>I'm involved in a project that requires putting in a fiber backbone
>for a very large campus, we've talked about putting in 144 strands of
>62.5 micron multimode fiber between buildings, but I'm wondering if 
>its worth including single-mode fiber as well.
>
My guess is that multi-mode will be obsolete in a couple of years. Its 
capacity peaks out around 200 Mbps. Single-mode goes well into the gigabyte 
range. Single-mode is also cheaper by the foot. Up to now it has been more 
expensive to connectorize and to drive, but that will change as the market 
gets bigger -- it's merely a problem of volume. We are putting in a 50-50 
mix of multi-mode and single-mode everywhere we install now. 
Richard M. Kogut,   Manager, Systems Services
                    Brown University Computing & Information Services

Re: Fiber: Single or Multimode?

#295

Author: Jim Sanchez
Date: Fri, 18 Dec 1992 15:33

13 lines
1170 bytes

I can suggest that if you want to form a high-speed backbone style
internet on your campus you will want to put some single-mode fiber in
place.  One thing which certainly comes to mind is ATM.  Not that you
cannot run FDDI/ATM over multimode fibers but you are at the maximum
rate for that medium over moderate distances.  With single-mode you have
lots of growth room (both distance and speed). Given that the marginal
cost of including some extra single-mode fibers is almost negligable, I
think the decision is a no-brainer.  It would be for me anyway.
Your results may vary.
-- 
Jim Sanchez
Hughes LAN Systems jsanchez@halcyon.com
Kirkland, WA 98033 (206)828-7417 (voice) (206)828-2454 (FAX)

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