Eicon Networks Eiconcard C90 Installation Manual page 9

Eiconcard C91 U-interface:
If your Eiconcard C91 has a U-interface, the NT1 is integrated into
the adapter, and you do not need a separate NT1.
ISDN wall jack
1.
Eiconcard C91
3.
2.
Figure 4. Connecting the ISDN cable.
1 Take the cable included with the Eiconcard C91.
2 Plug the RJ-45 end into the Eiconcard C91.
3 Plug the RJ-11 end into the ISDN wall jack.
In North America, many ISDN wall jacks (with a U-interface)
Note
are RJ-11. However, if your ISDN wall jack is RJ-45, you can still
plug the RJ-11 end of the cable into your RJ-45 ISDN wall jack
(there will be some space on both sides of the plug).
Making an ISDN Connection 9