You can either statically or dynamically define a channel-attached NCP.

To define a channel-attached NCP, take the following steps:

1. Code a PCCU definition statement.
   • The CUADDR operand on the PCCU definition statement specifies the channel address of the channel adapter on the NCP that is used to perform the load operation. The operator can also specify the channel unit address on the VARY ACT operator command. VTAM® identifies the channel link and link station by using the channel unit address.
   • The LOADSTA and DUMPSTA operands on the PCCU definition statement can also be used to identify to VTAM the channel-link station to be used to load and dump the NCP.
   Following is a sample PCCU definition statement for the channel-attached NCP in Figure 1:

   PCCU116  PCCU  CUADDR=016,         3720 IPL ADDRESS
                  DUMPDS=NCPDUMP,     NCP DUMP DATA SET DDNAME
                  MDUMPDS=MOSSDUMP,   MOSS DUMP DATA SET DDNAME
                  CDUMPDS=CSPDUMP,    CSP  DUMP DATA SET DDNAME
                  VFYLM=YES,          NOTIFY OPERATOR IF WRONG LOAD MODULE
                  VFYC=YES,           VERIFY LOAD MODULE AND RRT MATCH
                  ⋮
                  SUBAREA=116         OWNING SSCP SUBAREA

   In Figure 1, VTAM uses the CUADDR operand from the PCCU definition statement (016) to define the channel link (016-L) and channel link station (016-S). VTAM will load the 3720 using channel link 016-L.

   Figure 1. Channel-attached 3720 Communication Controller

   

   VTAM chooses default link stations that are adjacent to the NCP and ready for the dump operation. Preference is given to channel-link stations.

   If a channel-attachment major node and its link and link station minor nodes are active when this NCP is activated, use the channel-link station name that is defined by the PU definition statement in the channel-attachment major node for the DUMPSTA, LOADSTA, and RNAME operands of PCCU.

2. Code a BUILD definition statement.
   Following is an example of the operands on the BUILD definition statement:

   BUILD    BUILD BFRS=240,                        SIZE OF NCP BUFFERS
                  ⋮
                  CA=(TYPE5,TYPE5),                CA TYPES
                  DELAY=(.2,.2),                   CA ATTENTION DELAYS
                  NCPCA=(ACTIVE,ACTIVE),           CA STATUS
                  TIMEOUT=(30,30)                  CA ANS — HOST FAILURE

   One of the channel links is used to load the NCP.

3. You can also define channel links using the GROUP, LINE, and PU definition statements of the NCP for a 3745 and optionally for a 3725 and 3720. The information about the channel-link characteristics can be coded as operands on these definition statements, similar to those used on the BUILD definition statement (CA, NCPCA, DELAY, and TIMEOUT). Code a LINE and a PU definition statement for each channel adapter. The names used to identify the channel link and link station to VTAM are the names specified on the LINE and PU definition statements, respectively.
   Following is an example of how channel links can be defined using the GROUP, LINE, and PU definition statements of the NCP:

   N111CA   GROUP LNCTL=CA             CHANNEL ADAPTER DEFINITIONS
   L5CA05   LINE  ADDRESS=00,          CHANNEL ADAPTER 5 RELATIVE ADDRESS
                  CASDL=125,           CHAN ADAPTER SLOWDOWN DELAY
                  NPACOLL=YES,         NPA COLLECTION
                  ⋮
                  CA=TYPE6,            CHANNEL ADAPTER TYPE
                  DELAY=.1,            CHANNEL ATTENTION DELAY
                  NCPCA=ACTIVE,        CHANNEL ADAPTER STATUS
                  TIMEOUT=180,         CHANNEL ADAPTER ANS - HOST FAILURE
                  TRANSFR=20,          MAXIMUM DATA TRANSFER SIZE
                  ISTATUS=ACTIVE       VTAM STATUS
   *
   P5CA05   PU    PUTYPE=5,            VTAM HOST CONNECTION — PUTYPE5
                  TGN=1                channel link TRANSMISSION GROUP NUMBER