Switched major node

The peripheral nodes and associated logical units that are attached to the token ring are defined in VTAM® using a switched major node.

As shown in the following sample, the same coding that is normally used for an SDLC switched peripheral node is used for a token-ring connection.

TRNODE1  VBUILD TYPE=SWNET
P1088TR1 PU     ADDR=04,             SDLC ADDRESS OF STATION
                ANS=CONTINUE,        CONTINUES IF NCP IN SHUTDOWN (1)
                ⋮
                IDNUM=10881,         IDENTIFICATION NUMBER
                IDBLK=017,           BLOCK IDENTIFICATION
                ISTATUS=ACTIVE,      VTAM INITIAL STATUS
                MODETAB=MODTAB1      LOGON MODE TABLE
*
LU108802 LU     LOCADDR=2            DEPENDENT LOGICAL UNIT ADDRESS
*
LU108803 LU     LOCADDR=3            DEPENDENT LOGICAL UNIT ADDRESS

For information about the ANS operand and error recovery activation, see Using error recovery activation.

If VTAM is to establish the connection to the token-ring-attached peripheral node (for example, use an automatic logon [LOGAPPL] to an application), also code a PATH definition statement in the switched major node.

The DIALNO operand on the PATH definition statement for the callout operation can be used to specify the TIC number, the system access point address, and the token-ring address of the peripheral node.

In the following sample, the TIC number is 02, the system access point address is 04, and the locally administered token-ring address of the peripheral node is the last four digits of the user's telephone extension.

PATH01   PATH   DIALNO=0204400000008735,   PERIPHERAL NODE TOKEN-RING
                                           ADDRESS
⋮
                GRPNM=TRNLG1               TOKEN-RING LOGICAL GROUP NAME

You can also use the DLCADDR operand on the PATH definition statement for the callout operation to specify dial information. Use of DLCADDR allows specification of up to 250 bytes of dial information (versus the 32-character limit of the DIALNO operand). The information from the DIALNO operand above would be coded as follows using the DLCADDR operand. The DLCADDR operands specify the data link control type (TR for token ring), the port address, the DSAP, and the destination address, respectively.

PATH01    PATH   DLCADDR=(1,C,TR)
                 DLCADDR=(2,D,2)
                 DLCADDR=(3,D,4)
                 DLCADDR=(4,X,400000008735)

Note: DLCADDR information is used by the DLC provider, and VTAM verifies only the syntax of the DLCADDR operand.