Textual conventions for NBS mibs.
        
Some informal NBS conventions used include the following:
        
  A DESCRIPTION specifying 'Persistent' indicates a user-
  configured attribute that can be stored in the Agent's
  non-volatile file system as a configuration file such as
  'startup-config'.
        
  A DESCRIPTION specifying 'Impulse' indicates a user setting
  that the Agent will immediately attempt but will not store
  persistently.
        
  An object name containing 'Admin' indicates a setting
  requested by the user which may be overridden by the system.
  Admin objects should be updated in the Agent immediately, so
  a GET request immediately after the SET is accepted will
  be answered with a GET-RESPONSE indicating the new value.
        
  An object name containing 'Oper' indicates an attribute's
  actual state.
        
  An object name containing 'Caps' is a bitmask which refers to
  the capabilities of an entity to support corresponding entries
  in a specified feature table.