IBM BC-201 - Manual (Page 14)

Overview of IBM Networking
STUN and BSTUN
BC-214
Cisco IOS Bridging and IBM Networking Configuration Guide
78-11737-02
Figure 90 shows the difference between an IBM network with STUN and one without STUN.
Figure 90 IBM Network Configuration without STUN and with STUN
IBM mainframe
Workstation
T1 serial link
Ethernet
Workstation
IBM 3x78 terminals
Ethernet
Local
site
Remote
site
Local
site
Remote
site
IBM 3x78 terminals
S2075
3x74
37x5
3x74
37x5
With
STUN
Without
STUN
T1 serial link
Ethernet
Ethernet
IBM mainframe
Workstation
Workstation