For the inbound messages from a particular system, if the storage for the PATHINs is insufficient, the signal will be delayed. This is reported on the RMF™ XCF report as REQ REJECT for INBOUND requests. If the delay causes signals to back up on the outbound side, eventually an outbound signal could get rejected for lack of buffer space. In this case, you may wish to increase the MAXMSG on the PATHIN definition. See Figure 1 for an example.

                  XCF USAGE BY SYSTEM
------------------------------------------------------------------
     REMOTE SYSTEMS                               LOCAL
-----------------------------------------      -------------------
                    INBOUND TO SYSC               SYSC      
                   ----------------------      ------------------- 

     .....       FROM        REQ      REQ      TRANSPORT       REQ
                 SYSTEM       IN   REJECT      CLASS        REJECT          
                 K004    117,613    1,373      DEFAULT           0
                 SYSA    101,490        0      DEF16K            0
                       ---------
                 TOTAL   219,103

Another indicator that the storage for PATHINs is insufficient is the BUFFERS UNAVAIL count on the XCF PATH STATISTICS report. If this is high, check the AVAIL and BUSY counts: AVAIL counts should be high relative to BUSY counts. High BUSY counts can be caused by an insufficient number of paths or a lack of inbound space. First look at the inbound side and see if there are any REQ REJECTs. If so, increase the PATHIN MAXMSG. Otherwise, it is important to review the capacity of the signaling paths. The methodology for determining this is described in Capacity planning.