Appendix A. Hardware Management Console (HMC) 237
Draft Document for Review April 7, 2004 6:15 pm 6947axA.fm

Additional token ring only wiring scenario

Additional connections to the token ring LAN may be made to expand the connectivity beyond
the local Hardware Management Console and Support Elements, as shown in FigureA-4 on
page 237.
If connections to previous generations of Enterprise Server systems are desired, they may be
connected using the MAU in the system, or they may be connected using token ring-to-token
ring bridges.
If connection to the enterprise LAN is desired, it is recommended that a token ring bridge be
installed to isolate the Hardware Management Console and Support Elements from other
systems.
If connection to a central site focal point is desired, a local control unit can be attached to the
LAN.
Figure A-4 Token ring only wiring with additional connections
Ethernet only - one-path wiring scenario
This Ethernet only wiring scenario is intended for enterprises that currently have Ethernet
installed and do not want token ring wiring introduced into their environment. This wiring
scenario requires that a second Ethernet be specified with the Support Elements, and that no
token ring feature be ordered on the Hardware Management Console, such that no token ring
exists in either the Support Elements or in the Hardware Management Console. (If your
system is going to use FC 0075, this console is always equipped with a token ring-Ethernet
communication capability. The token ring wrap plug shipped with the system must be installed
in the Hardware Management Console token ring adapter to enable the console to operate
properly without using token ring.)
Bridge
Bridge
zSeries 990
SE
SE
Control
Unit
S/390
S/390
Focal
Focal
Point
Point
SE
SE
zSeries 990
Enterprise
LAN
Token-Ring LAN
Token-Ring LAN