We have GS1280 and ES40s with DEGXA-TB gig etherned adapters. They should show up as EWx devices. EWA-x, EWB-x, EWC-x, etc if you have more than one. When you use the DCL command $ show device EW you might see EWA-0, EWA-2, EWA-4. Looks to be one for each protocol and maybe other things...just looked at one and it was T4 running to collect data. I would guess that if you have IP, DECnet and cluster services running on the DEGXA card, there would be at least 3 EWA-x devices.
You can get more information on the devices in $ MC LANCP ....show device EWA-x /char or /count.