Exceeding Number of Connections

What are the practical effects of exceeding the number of connections that a poll thread is set to handle via onconfig file's NETTYPE parameter? During functional testing, we inadvertently created over 750 connections (as reported by onstat -u) with NETTYPE set to tlitcp,1,128,NET. We observed no ill effects -- performance degradation, slowness spawining additional connections, server dying, etc. So what is actually happening here? Is the poll thread actually doing any "work," or just establishing and disconnecting sockets? We're running IDS 7.31.UC4 on Solaris2.7/Intel (don't ask).