3Com SuperStack 3 NBX Administrator's Manual page 289

Figure 113 Digital Line Cards Tab
3 Select T1/ISDN Board List from the Select Device Type list, and click Apply.
All Digital Line Cards (T1, E1, or BRI-ST) that the system has discovered
appear in the list. By default, the NBX system autodiscovers a T1 Digital
Line Card as a T1 DS1 card and displays it in the list as T1 (not PRI).
4 From the list, select the new T1 Digital Line Card. Use the MAC address of
the T1 Digital Line Card to identify the card in the list. You recorded the
MAC address before inserting the card.
5 Click Modify. The Modify Board dialog box appears (Figure 114).
Configuring and Managing T1 Digital Line Cards 289