Visara FEP-4600 Planning Guide - Manual (Page 13)

37x5 to FEP-4600 Migration and Planning Guide
707117-003 1-5
SDLC-Attached PU 4 Nodes
PU 4 (remote 37x5) platforms are supported through the FEP-4600 over SDLC lines. The
FEP-4600 connects to a UNIT=SCTC definition in IOCDS and a Channel Attached
Major Node PU TYPE=4 definition in VTAM (CA definition). PU 4 connections can be
same-network or SNI. Normally it is recommended that the FEP-4600 is configured to be
the secondary on the SDLC line when communicating with a 3745, and a configuration
parameter is offered to accomplish this. The FEP-4600 can support DTE and DCE
connections, using RS232 or V.35 physical interfaces. X.21 connections are supported
using an RS232/X.21 adapter or V.35/X.21 adapter. DCE connections require a DTE to
DCE adapter provided by Visara for each line that is to be run as a DCE.
Ethernet LLC-attached PU 2.0 Platforms
PU 2.0 platforms are supported downstream from the FEP-4600 on Ethernet networks
using LLC2 protocol. Upstream, PU2 traffic is routed through an XCA connection to
VTAM. Using this method up to 255 downstream PU 2.0 platforms can be supported
through a single XCA communication pipe. Up to 8 XCA communication pipes may be
defined for use with a single Ethernet interface (total of 2048 downstream PUs). Each
XCA Major Node definition uses one of the available 256 subchannels provided by the
ESCON interface.
For older units supporting the Luminex ESCON interface card, you could also define a
Channel Attached Major Node PU TYPE=2 in the VTAM definitions and UNIT=3174 in
the CNTLUNIT and IODEVICE macros. Using this method the number of downstream
PUs will depend on the number of Channel Attached Major Nodes defined. Each Channel
Attached Major Node requires one of the available 256 subchannels provided by the
ESCON interface.
DLSw can be supported by passing the LLC traffic to a router supporting LLC2/DLSw
conversion. The FEP-4600 also supports internal DLSw conversion (see Ethernet DLSw-
attached PU2.0 Platforms).