Visara CNA-8000 Planning Guide - Manual (Page 39)

CNA-8000 Migration and Planning Guide
707156-002 5-1
Chapter 5. Migrating from 1174 or 3174
Performing a migrating from a Visara 1174, Memorex Telex 1174, or IBM 3174 to a
CNA-8000 requires as a minimum, a change to the host gens. It should be possible
however to avoid changes to downstream PU2 platforms when implementing the SNA
PU2 gateway feature, or if migrating from the 1174 TN3270 gateway feature.
In the case of an ESCON (or Bus and Tag) 1174 or 3174 gateway product, all traffic
passing through those platforms appeared to VTAM and the IO system as if all hardware
were locally channel-attached 3270 controllers. This required one or more local channel
definitions. Each PU defined required its own subchannel for communications. The
CNA-8000 instead, makes use of XCA technology for any PU2 definitions. XCA
technology supports traffic for up to 255 PU2 platforms through a single subchannel.
CNA-8000 downstream connections to both PU2 platforms and TN3270 clients look
approximately the same as their 1174 counterpart. The 3174 supports a subset of the 1174
feature set so the transition requirements are the same. The following example should
illustrate the transition requirements.
Sample Network with 1174
The following network shows a single 1174 SNA Gateway supporting a couple of PU2
downstream platforms as well as a few thousand TN3270 clients.
PU2.0 Controller
3000
TN3270 Clients
AS400/PU2.1
1174-25S Gateway
Z10 Host Processor
3x Ethernet
Interfaces