In SNA, a network with more than one system services control point (SSCP). In other words, it is a network with more than one host processors. In each host, there is an active VTAM.

• 在系统网络体系结构(SNA)中,一种其中有多个(二个以上)系统服务控制点(SSCP)的网络。另一种说法,多域网是一种拥有多台(二台以上)主处理机的网络,在每台处理机中都有一个VTAM(IBM专用的联网通信软件)在运行着。