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 useare 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

Page 45
Image 45
IBM manual Network Allocations on the 8260 Backplane, An example of the output from this command is shown in on

8260 specifications

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