LLC, Mapped Ethernet and Station Management (SMT) services.

   The DNA IEEE 802.5/Token Ring module incorporates the 
   functions and operations defined in the IEEE 802.5 Token Ring 
   Access Method, parts of the ISO 8802-1 (IEEE 802.1) Addressing, 
   Internetworking and Network Management, and parts of the 
   ISO 8802-2 (IEEE 802.2) Logical Link Control (LLC) specifications. 
   To this, the DNA 802.5/Token Ring Data Link adds features often 
   needed by users of the data link. A typical such user is the 
   Network Layer of the Digital Network Architecture (OSI).
 
3  Subentities

   The entity hierarchy of the Token Ring module is:


   Node___Token_Ring____Port
                      |
                      |_Station____Source_Route
                                 |
                                 |_FA_Map

   The TOKEN RING entity is the top-level entity in the hierarchy of 
   entities belonging to the Token Ring module.

   A TOKEN RING PORT entity represents an access point to the service 
   offered by the Token Ring module.  A client transmits and 
   receives data through a port.  Ports are created and deleted by 
   client use of open and close service interface procedures.  
   The port-name refers to the port managed by this command.

   A TOKEN RING STATION entity manages a Token Ring controller. Each
   station corresponds to a particular instance of Logical 
   Link Control (LLC), Medium Access Control (MAC), and physical 
   attachment. The Token Ring data link can be monitored and controlled 
   through DNA network management. The station-name refers to the 
   station managed by this command.

   A TOKEN RING STATION SOURCE ROUTE entity describes an entry in the 
   Source Routing database. In Transparent Source Routing, the Source 
   Route entities are typically created and enabled by the parent 
   Station entity. The sourceroute-id refers to the source route
   entity managed by this command.
  
   The TOKEN RING STATION FA MAP (Functional Address Mapping) entities 
   describe the default Functional Address-Global Address mapping to be 
   applied to ports that are created with the same protocol identifiers. 
   The famap-id refers to the FA map entity managed by this command.


2  Loopback_Application

   The Loopback Application module allows a network manager to
   invoke a loopback test between applications on two nodes,
   thus testing all the supporting layers of the Digital Network
   Architecture.

   The Loopback Application module has two components:

   o  The loop access module, which initiates the loopback test

   o  The loop mirror module, which accepts connections from the
      remote loop access modules and mirrors any data sent to it
      back to the sender.

   The Loopback Application module has only one entity: the loopback
   application entity.  This loopback application entity describes 
   features of the Loopback Application module which allows you to 
   run a loopback test between two nodes or itself. The loopback 
   application entity is created and deleted automatically with the 
   node entity, and is always enabled.