Adapter Parameters; Adapter Addresses - IBM Token-Ring Network PC Adapter Manual To Operations

Adapter Parameters
There are two kinds of adapter parameters: adapter addresses and
Shared RAM locations.
Adapter Addresses
4-6
Each adapter already has an address that has been assigned at
the time of manufacture and permanently encoded in the
ada pter' s memory. This address is in the range that is
administered universally by the standard committees for local
area networks. This universally administered address is the
default address for the adapter if no other address is assigned.
If your network administrator chooses, he may assign a locally
administered address that will override the universally
administered address on the adapter. This address must consist
of 12 hexadecimal digits that range from '4000 0000 0000' to
'4000 7FFF FFFF'. Values outside this range may be
incompatible with other products on the network.
For typical network installations, it is recommended that the
address be restricted to decimal values. The locally administered
address would then range from '4000 0000 0000' to '4000 7999
9999' decimal.
Note:
Make sure the address is recorded on the physical and
logical address Locator Charts. These charts and an explanation
of them can be found in the IBM Token-Ring Network
Introduction and Planning Guide. See the IBM Token-Ring
Network Administrators Guide for guidance on assigning locally
administered addresses.
Warning:
Each address must be unique on the network. An
error will result when two or more adapters with the same
address attempt to use the network.
To code the adapter address, see "Coding Adapter Parameters"
on page 4-8.