🚀 go-pugleaf

I'm not an official IBM spokesman, but let's see if I can get close
to the truth.  Any mistakes are mine, not IBMs.

TCP/IP on VM doesn't support either the 3720 or the 3174 controllers.
Neither of those controllers supports Ethernet, either.

The 3174 can be used on either coax (not Ethernet coax) or Token-Ring;
on coax it supports real 3270 terminals; on Token-ring it supports
PCs emulating 3270s and it supports SNA protocols.  The 3720 supports
various communications lines, async, SDLC, etc as well as Token-Ring;
again, this box is usually used to support SNA connection of devices,
but can be used for async or bisync support without SNA.  It also 
supports Token Ring, but for SNA only.

The TCP/IP for VM product can speak to several devices, but again
not either of the ones you've got.  If you've got a 9370 processor
there's an Ethernet adapter that fits into the processor itself that
TCP/IP can drive.  On other processors, there's a device called the
8232 that hooks onto a S/370 channel and also goes onto one or more
Ethernets and/or Token Rings; this device supports TCP/IP.  This is
the hardware that you'll need for TCP/IP on VM.

As far as Ethernet 3270 emulators, the VM TCP/IP product provides a
telnet server that can provide either 3270 or line-mode sessions via
TCP/IP.  There are a variety of telnet programs for many machines that
provide 3270 emulation via telnet for different client machines.

Hope that helps!

Sam Drake / IBM Almaden Research Center