External communication adapter connection to CSMA/CD 802.3 LAN

You can code an external communication adapter major node to define a connection from VTAM® to a CSMA/CD 802.3 local area network through a 3172 interconnect controller. Figure 1 shows a multiple-domain XCA configuration with a CSMA/CD 802.3 local area network and two 3172 interconnect controllers.

Figure 1. XCA multiple-domain configuration with CSMA/CD 802.3

A diagram that shows a multiple-domain XCA configuration to a local area network through two 3172 interconnect controllers.

In the sample external communications adapter major node for one of the two 3172 connections depicted, GROUP GP1C21 defines a peripheral (DIAL=YES) connection, while GROUP GP1C22 defines a subarea (DIAL=NO) connection. A corresponding switched major node that defines GRPNM=GP1C21 on the PATH definition statement must also be defined for the peripheral connection.

LMNBC0   VBUILD  TYPE=XCA
PORT1C2  PORT    MEDIUM=CSMACD,ADAPNO=0,SAPADDR=4,CUADDR=BC0
GP1C21   GROUP   DIAL=YES,ANSWER=ON,ISTATUS=INACTIVE,CALL=INOUT
L1C211   LINE
P1C211   PU
L1C212   LINE
P1C212   PU
L1C213   LINE
P1C213   PU
L1C214   LINE
P1C214   PU
*
GP1C22   GROUP   DIAL=NO
L1C221   LINE    USER=SNA,ISTATUS=INACTIVE
P1C221   PU      ISTATUS=INACTIVE,MACADDR=40000EEEE137,PUTYPE=5,       *
               SUBAREA=02,TGN=255,SAPADDR=4
L1CV11   LINE    USER=VCNS,ISTATUS=INACTIVE

For more information about attaching a CSMA/CD 802.3 local area network through an IBM® 3172 Nways Interconnect Controller, see the z/OS Communications Server: SNA Network Implementation Guide.