1 
0                                                          Ref. F2
-                VMNCP : DIAGNOSTIC CODES  (Ref. F2)
+                _____   __________ _____   ___  __
0                                               Version 3
+                                               _______ _
0                                               8 March 1982
+                                               _ _____ ____
0                                               P M Girard
+                                               _ _ ______
0  The diagnostic codes issued by VMNCP  (and also by DKNCP in the
   MVT system)   are based on  those recommended in  the Transport
   Service specification (Ref. A6).
0  The list  below covers  those actually  used,  and  explanatory
   comments are added where appropriate.
0            X'01'  : DISCONNECT received from other end
             X'11'  : Number busy (no ports into application)
             X'12'  : Out of order (no response from application)
             X'13'  : Invalid address
             X'17'  : Network congestion (at call set-up)
             X'21'  : Protocol error (accusation)
             X'22'  : Timeout
             X'24'  : Flow control error
             X'25'  : Network congestion (during call)
             X'26'  : Network failure (call lost)
             X'27'  : Lost contact with Application
             X'28'  : Transport Service failure
             X'29'  : Call (or program) killed by operator
             X'2C'  : RESET received from other end
             X'41' to X'5F': VMCF error codes (low 6 bits)
             X'7F'  : VMCF not available
             X'80' to X'BF': Application-level codes (low 6 bits)
             X'C0' to X'FF' : Gateway codes (low 6 bits)
0  If NCP  closes down  the Application/NCP  interface on  its own
   initiative (without  receiving a  Clear Indication  packet from
   the network),  the  Application will see a  'clearing cause' of
   X'40' accompanied by one of the diagnostic codes defined above,
   or possibly (while setting up an  outging call)  by one one the
   following:
0            X'33' : Line to network out of service
             X'34' : Invalid network address
             X'35' : No network resources for more calls
             X'36' : Invalid address in an ADDRESS messages
             X'37' : Protocol violation by Application
             X'39' : Ambiguous network address
0  Reference:
+  _________
0  A6 : A Network Independent Transport Sevice
                (PSS User Forum Study Group 3)
- 
   VMNCP : DIAGNOSTIC CODES                                 PAGE 1