Filter
Top Products
An example of the output from this command is shown in Figure 8 on page 23.
8260> show backplane_paths fddi
Physical Path Logical Network
--------------- ---------------
FDDI_PATH_8250_1 in use
FDDI_PATH_8250_2 in use
FDDI_PATH_8250_3 in use
FDDI_PATH_8250_4 in use
FDDI_PATH_8250_5 in use
FDDI_PATH_8250_6 in use
FDDI_PATH_8250_7 in use
FDDI_PATH_8250_8 available
8260>
Figure 8. Backplane Path Display for FDDI Segments
The number of FDDI paths used by a single FDDI network on the Enhanced
TriChannel equals the number of FDDI modules on that network.
The FDDI paths on the Enhanced TriChannel use the same pins on the backplane
as are used by the Ethernet and/or token-ring segments. In Figure 8, the FDDI
paths shown as ″in use″ are those backplane pins which are used by other
segment types (that is, token-ring and/or Ethernet). Also, note that in this
example, we had no FDDI modules installed in our 8260.
On the ShuntBus, in addition to the two dedicated Ethernet segments, there can
be up to 4 FDDI segments. Unlike, the Enhanced TriChannel, there is no concept
of FDDI paths on the ShuntBus. Instead, there are 4 FDDI networks, each using
14 pins. The FDDI segments on the ShuntBus use the same pins as the
token-ring segments.
2.5 Network Allocations on the 8260 Backplane
As we now have so many options of switching modules and ports between
networks it is perhaps a good time to clarify the rules regarding those
allocations.
•
8250 Ethernet ports or modules can be connected to parallel addressed
segments (ethernet_1 thru 3 on the Enhanced TriChannel) only.
•
8250 Ethernet ports or modules cannot be connected to serially addressed
segments (ethernet_4 thru 8) on either the TriChannel or ShuntBus.
•
8260 Ethernet ports or modules can be connected to any of the segments
(ethernet_1 thru 8) on the TriChannel or ShuntBus. When connected to
ethernet_1 thru 3, they use parallel addressing and when connected to
ethernet_4 thru 8 they use serial addressing.
•
8250 token-ring or FDDI modules can only be connected to the segments on
the Enhanced TriChannel. They cannot be connected to the segments on the
ShuntBus.
•
8260 token-ring (or future 8260 FDDI) modules cannot be connected to any
segment on the Enhanced TriChannel. They can only be connected to the
segments on the ShuntBus.
Chapter 2. Backplane Architecture 23