Enhanced Trichannel Bus - IBM Nways 8260 Manual

Figure 3. Enhanced TriChannel Bus
The number of pins available for user traffic on the ShuntBus is 72 pins. These
pins are used to set up 2 dedicated Ethernet segments as well as 10 token-ring
(or 4 FDDI) segments as shown in Figure 4 on page 15.
On the ShuntBus, 8 pins out of the 72 network traffic pins are dedicated to be
used by two Ethernet segments. These dedicated pins are not available to be
used by other segment types. The remaining 64 pins on the ShuntBus are
available to be used by token-ring and/or FDDI segments. This allows you to
have a mixture of token-ring and FDDI segments as well as two Ethernet
segments on the ShuntBus. The rules governing the maximum number of FDDI
and token-ring segments allowed in a mixed token-ring and FDDI environment
are discussed in 2.5, "Network Allocations on the 8260 Backplane" on page 23.
The following is the permitted maximum number of LAN segments on the
ShuntBus:
14
8260 Multiprotocol Intelligent Switching Hub
2 Ethernet and
10 token-ring or 4 FDDI
Note
At the time of writing this publication, there are no FDDI modules available
that can be assigned to the FDDI segments on the ShuntBus. Therefore,
practically, the ShuntBus allows you to have two Ethernet segments plus 10
token-ring segments.