OSI/TS Configuration and Management Manual

Managing a Transport Connection
OSI/TS Configuration and Management Manual—424831-001
6-14
Connection Release in Classes 1 Through 4
3. If DISCONNECTTIMEOUT expires before either a DC-TPDU or DR-TPDU has
been received, OSI/TS considers the connection released. All pending file-system
requests on the connection are completed with error 140.
Over connectionless network service, OSI/TS transmits DR-TPDUs up to
MAXREXMIT times, waiting for a DR-TPDU or DC-TPDU.
If OSI/TS is using protocol classes 0 or 2, no recovery mechanisms are provided. This
means that if a subnetwork reset or disconnect is received, OSI/TS releases the transport
connection and informs transport users by completing all pending requests with a file-
system error 140. Under classes 1, 3, and 4, subnetwork resets and disconnects invoke
reassignment and resynchronization procedures.