Visara FEP-4600 Planning Guide - Manual (Page 23)

37x5 to FEP-4600 Migration and Planning Guide
707117-003 2-5
Meanwhile, the FEP-4600 maintains the downstream connections to the real PU 2.0
platforms over the network connections supported by those platforms (Token Ring,
Ethernet, SDLC) as if they were still talking to the front end processor.
All SNA traffic is passed from end to end, so that VTAM and NetView have full
visibility to the actual PU 2.0 platforms and all of their LU attachments.
Since PUs are defined to be associated with a local channel, they must attach through that
specific channel interface. This limits redundant connections to be only at the network
level (attachment through multiple Token Ring or Ethernet connections). Redundant
network connections are achieved by setting these connections up on the FEP-4600 as
dynamic connections. If you want redundant channel connections, you must make
redundant definitions in VTAM as well.
IBM S390 IBM z990
Director
Appears to the host as a series of 3174
controllers attached to an ESCON cable, each
with its own subchannel assignment