3Com SuperStack 3 NBX Administrator's Manual page 241

If the DDI/DID numbers match your internal extension numbers, the
translator entries in your Dial Plan configuration file can be much simpler.
Example: You plan to use internal extensions from 100 through 299,
and the local telephone company assigns you numbers from
617-555-4100 through 617-555-4299. If the local telephone carrier
passes you three digits, you need no translator entries in the Dial Plan
configuration file. If the carrier passes you four digits, you could add a
single set of translator entries to the configuration file to remove the first
digit (4) and use the remaining three digits as the internal extension.
Enabling Auto Discovery for Digital Line Cards
To enable Auto Discovery for Digital Line Cards:
1 Log in to the NBX NetSet utility using the administrator login ID and
password.
2 In the NBX NetSet - Main Menu window, click System Configuration.
3 In the System Configuration window, click the System Settings tab.
Depending on how you access this window, the System Settings tab may
already be selected.
4 Click the Auto Discover Digital Line Cards check box.
Other check boxes may be selected based upon previous Auto
Discoveries. You do not need to clear these check boxes to install the
BRI-ST card.
5 Click OK.
Inserting the ISDN BRI-ST Digital Line Card
You do not need to remove the power cable from the chassis before you
insert the BRI-ST card.
To insert the BRI-ST card into the chassis:
1 Write down the MAC address of the BRI-ST card.
2 Select a slot for the BRI-ST card in the chassis, and use a Phillips
screwdriver to remove the blank faceplate from the slot.
3 Insert the BRI-ST card into the slot.
4 Slide the BRI-ST card into the chassis until you feel it touch the
connectors.
Configuring and Managing BRI-ST Digital Line Cards 241