Zoom ADSL X4 - Manual (Page 19)

Chapter 1: Installation Instructions 19
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Once the modem detects your settings, your VPI, VCI, and
Encapsulation settings will appear in the table on the
Autodetect page. Click the Encapsulation setting to continue
with the process.
Note:
If your Encapsulation setting is not found (that is, if “No
Encapsulation Protocol Detected” remains on the screen),
select the Disable option button, click Save Changes, then
click the Basic Setup icon at the top of the screen and try to
manually configure the modem, as explained in Configuring
the X4 Manually on page 22.
When your Encapsulation
setting appears, click it to
continue with the process.
(Note that yours may be
something other than
PPPoE.)