3Com SuperStack 3 NBX Administrator's Manual page 301

Verifying T1 Group Membership (ISDN PRI)
To verify that all channels are in the Member List:
1 Return to the Digital Line Cards tab (Figure 113).
2 From the Select Device Type list, select ISDN PRI Group List.
3 Click Apply.
4 Select the group you want.
5 Click Membership. The Manage Group Membership dialog box
(Figure 122) appears.
Figure 122 Manage Group Membership Dialog Box
6 Scroll through the Member List to verify that all 23 channels are present.
7 To change the membership of a group, you must move channels from the
Non-Member List to the Member List. You cannot move a channel from
the Member List to the Non-Member list of a group.
For each channel that you move to the Member List, you have two
options:
a To copy the current group settings, and apply them to the channel in
the new group, enable the Copy Group Settings to Channels on
Add/Remove check box.
b To update the status of a channel, enable the Refresh Channels on
Add/Remove check box.
Configuring and Managing T1 Digital Line Cards 301