when stl was going to move 300 people from the IMS group off-site ... they looked at remote 3270s support but found it terribly unacceptable ... after being use to on-site, channel attached, local 3270 vm370 response.
I did the support for them that used HYPERChannel as channel extender to put 300 "channel-attached" local 3270s at the remote site. Even tho the connection was T1 (running over plant site "campus" T3 microwave), IMS group at the remote site didn't notice any degradation in response (actually system thruput went up 10-15% because the 3274 controllers were removed from direct channel attachment and replaced with the HYPERChannel A22x boxes which had significantly lower channel busy for the same operations) misc. past posts mentioning various HYPERChannel work (&/or HSDT project) http://www.garlic.com/~lynn/subnetwork.html#hsdt The operation was then replicated in Boulder when IMS field support group was moved to building across the highway. Instead of having T1 channel on T3 microwave, they had T1 infrared modems between the roofs of the two bldgs. There was concern about loss of signal during heavy storms .... however, the noticable case was during a white-out snow storm (when nobody could get into work) ... there was sporadic bit-errors recorded. The biggest problem was that the modems were mounted on wooden poles on the roofs of the two (multi-story) bldgs and they (initially) lost alignment during the day (uneven sun heating on the sides of the bldgs ... resulting in bldg alignment changing). -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
