Connecting a subarea node to VTAM

If a VTAM® is connected to a subarea node, a physical link between the nodes must be connected and functional at both ends. A subarea node can be a host processor (containing another VTAM) or a communication controller (containing an NCP).

The following list shows where to find information about the following connections:

Connecting two VTAMs using channels
Connecting two VTAMs through communication controllers
Connecting two VTAMs using an external communication adapter
Connecting an NCP to VTAM
Connecting an NCP to another NCP

Note: Earlier releases of VTAM support type 2.1 casual connection, a way of connecting two VTAMs in a peer-to-peer relationship using low-entry networking (LEN). While type 2.1 casual connection is still supported, IBM® recommends that you use APPN to connect two VTAMs in a peer-to-peer relationship. See Connecting an APPN node to VTAM for information about connecting two VTAMs using APPN.