Bus&Tag:
122m (AFAIK 400 ft)
AFAIK the nominal speeds were 1.5, 3.0, and 4.5 MB/s
For Hitachi devices it could be 6.0 MB/s
ESCON:
MM - 3km
SM - 20km
Typical value in sales leaflets is 43km which means XDF feature (means
Single Mode) in CPC - 20km - Escon Director - 20km -Escon Director - 3km.
The last distance had to be 3km (MM), because there were no devices with
XDF ports.
The reality differs significantly from the theory. Reason 1: nobody uses
ESCD's as repeaters, rather DWDM's, besides IBM totally dropped XDF
feature in CPCs. Reason 2: The longer distance, the slower transmission.
FICON:
Usually SM, distance 10km. Performance impact is much less, than in ESCON.
ISC
SM - 10km
ICB
copper 10m
--
Radoslaw Skorupka
Lodz, Poland
Ted MacNEIL wrote:
I was asked the maximum distance that an ESCON Channel
could span.
IIRC, it was 40km for CTC, 20km for tape, and 9km for DASD.
I was not believed.
Does anybody know?
And, where would I look this up?
I haven't really cared since the early 1990's.
Also, does anybody remember the distances for parallel
(1.1, 1.5, 3.0, & 4MB/s -- if I recall all the speeds)?
Also, what about FICON (all flavours)?
Again, does anybody know where I could look this up?
I have forgotten (getting old is not for sissies!).
-teD
Me? A skeptic? I trust you have proof!
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