CPNAME

Specifies the control point (CP) name of a type 2.1 peripheral node. If a type 2.1 peripheral node supports it, coding CPNAME is required if the peripheral node supports role negotiation (such as 3172, 3174, and Communications Manager).

To dial in, a type 2.1 peripheral node on a switched line requires either CPNAME or both IDBLK and IDNUM on the PU definition statement. However, you can code all three operands.

To dial out without knowing the partner's CPNAME or IDBLK and IDNUM, code CPNAME without a value (CPNAME=).

For dial-in or dial-out, if CPNAME is not in the XID or if you do not code CPNAME, VTAM® uses IDBLK and IDNUM instead.

VTAM uses the CP name of a type 2.1 PU to identify the PU in any messages. For an APPN PU, its name (or label) must differ from control_point_name (specified here on CPNAME) to ensure that a CP-CP session establishment succeeds. If name and control_point_name are duplicates, the session establishment fails and sense code 08880001 is given.

When VTAM is defined as a type 2.1 node, code CPNAME the same as SSCPNAME on the other side of the connection. Ensure that SSCPNAME is unique within the host domain.

See the appropriate product manual for CPNAME, IDNUM, and IDBLK values.