IBM GC09-2830-00 - Manual (Page 18)

Connections via Communications Gateway
Some organizations prefer to concentrate access to SNA networks through
dedicated SNA Gateways, such as IBM eNetwork Communications Server,
Microsoft SNA Server, or Novell Netware for SAA. DB2 Connect products
support connections through gateways, so this can be a good choice if you
need terminal emulation and other SNA services not provided by DB2
Connect. Figure 2 on page 7 illustrates such a situation.
6 Quick Beginnings