Since we have VM/RSCS appearing as a RJP workstation to JES3 using EP and a 3745, can it do the same using the SNA protocol to look like a 3770 device, but minus the 3745?
If I'm reading the RSCS docs correctly, no. The RJE drivers really do expect a physical line, as far as I can tell. The exit customization guide also seems to point that way.
