Specifications

A.10 Default Configurations
A–16 FDDI Configuration Capabilities
A.10.6 Example of Module Reacting to Change of Environment
If a DECswitch 900EF module, that is configured with an S port and M port on the
ModPMDs, is moved from a DEChub ONE-MX docking station to another, the
module powers up with the ModPMDs of the second DEChub ONE-MX enabled as
S and M ports (previous configuration recall ability).
If the same module is then moved (from the DEChub ONE-MX docking station) to a
DEChub ONE docking station, the module detects an environment change, and pow-
ers up with the front panel ports enabled as A and B ports (the module’s default con-
figuration).
If the module is again moved back to a DEChub ONE-MX docking station (from the
DEChub ONE docking station), the module again detects a new environment, and
powers up with the front panel ports enabled as A and B ports (default configura-
tion).
Also, if a module is moved from a DEChub ONE-MX to another that has a different
ModPMD configuration, the module powers up and, sensing that it is still in a
DEChub ONE-MX, configures the ports per the previous configuration recall pro-
cess. The FDDI Network configuration recall process does not detect a change in the
media type of the ModPMDs in the DEChub ONE-MX.