Ethernet only - one-path wiring scenario – IBM 990 User Manual
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IBM
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zSeries 990 Technical Guide
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.)
The Ethernet features assume the use of 10/100 Mbit Ethernet facilities, requiring the use of
CAT-5 Ethernet cabling.
Since the Support Element Ethernet only feature includes two Ethernet adapters, there will be
two Ethernet connections available. For this scenario, only the Ethernet cable connected to
the Ethernet in the first (top) PCMCIA slot of the Support Elements will be used.
The three communication protocols (SNA, TCP/IP, and NetBios) used in Support
Element-to-Hardware Management Console communication are defined for both adapters in
the PCMCIA slots of the Support Elements.
It will be necessary to connect the “top” Ethernet adapter cable to a customer-supplied local
hub capable of 10/100 Mbit Ethernet rates. It will be necessary to connect the Ethernet from
the Hardware Management Console to either the same hub as the Support Elements, or to a
hub that connects to the Support Element hub.
Figure A-5 on page 241 gives an overview of the Ethernet only - one path wiring scenario.
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