Using the Realtime Monitor › Communication Line Detail (PF3)

Communication Line Detail (PF3)

 PM-Rnn.n SYSTEM71         CA, Inc.                  V71      08.348 14:50:06.43
 CMD-->                                                             Window : 02
                                                                    Refresh: 10
   02 Communication Line Detail                                               >
    Line       Write   Total    Read   Total   Line RPL    Waits Total RPLs
    Name      Errors  Writes  Errors   Reads Status Gen   On RPL  Requested
    CONSOLE        0       0       0       0 INSRVC   0        0         0
    VTAM16         0   82015       3   67637 INSRVC  25        0    162354
    PRINT16        8    1057       2       0 INSRVC  40        0      1315
    DIAL16        25   24899       6    1144 INSRVC   0        0         0
    UCF16          0     159       0     178 INSRVC   0        0         0
    S16VTM         0       0       0       0 INSRVC   0        0         0

 PM-Rnn.n SYSTEM71         CA, Inc.                  V71      08.348 14:50:06.43
 CMD-->                                                             Window : 02
                                                                    Refresh: 10
   02 Communication Line Detail                                            <
      Total   Line RPL    Waits Total RPLs Line       Term ACBname/ Compact
      Reads Status Gen   On RPL  Requested Type      Count DDname   Y/N
          0 INSRVC   0        0         0  WTO           1 CONSOLE     N
      67637 INSRVC  25        0    162354  VTAM 3270   250 SYSTEM16    Y
          0 INSRVC  40        0      1315  VTAM 3270    79 PRINT16     N
       1144 INSRVC   0        0         0  START STP     6 S16DIAL     N
        178 INSRVC   0        0         0  UCF          10 RHDCFSTB    N
          0 INSRVC   0        0         0  DDS VTAM      2 DDSVTM57    N

Screen Description

The Communication Line Detail screen displays a line of information about the activity on each teleprocessing line. Since line speed is slower than processor speed, online, tasks should minimize I/O requests. In addition, applications should be designed to transmit only modified fields.

What To Look For

• Look for a high number of request parameter list (RPL) waits for each VTAM or DCAM line, shown in the Waits On RPL field. A high number can indicate a problem, especially for a line that contains one or more printers. There should never be an RPL wait for a printer.

  The optimal number of entries in the RPL for a line should be 15% to 20% of the number of physical terminals in the line group, plus the actual number of printers in the group. Specify this number in the RPL COUNT IS parameter in the system generation LINE statement for the VTAM line (VTAMLIN), or in the RPB COUNT IS parameter for the DCAM line (DCAMLIN).

• Look for a high value in the Write Errors or Read Errors fields. I/O errors occur when the system attempts to write to or read from a device assigned to the communication line. Identify the problem terminal and run a terminal trace to diagnose the problem by issuing a DCMT PTERM command.