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248 CHAPTER 3: DEVICE CONFIGURATION
You can enable or disable echo cancellation for each T1 Digital Line Card.
You cannot enable or disable echo cancellation on individual channels.
Before you enable echo cancellation for a T1 Digital Line Card you must
verify that the card is configured for DS1 operation and not ISDN PRI.
To enable echo cancellation:
1 On the Digital Line Cards tab, select T1 Span List from the Select Device
Type drop-down list and click Apply.
2 Select the span for which you want to set echo cancellation.
3 Click the Audio Controls button.
4 Enable the Echo Canceller Enabled check box to turn on echo
cancellation.
5 Click OK.
Configuring a T1
Digital Line Card for
ISDN PRI Signaling
These sections tell you how to use the NBX NetSet utility to set up your T1
Digital Line Card for ISDN PRI signaling:
■ T1 ISDN PRI Configuration
■ Configuring T1 Groups (ISDN PRI)
■ Verifying T1 Group Membership (ISDN PRI)
■ Completing the T1 Configuration (ISDN PRI)
Before you configure a T1 Digital Line Card for ISDN PRI (Primary Rate
Interface) signaling, read the cautionary note.
CAUTION: Wait 3 minutes for the T1 card to initialize and for the system
to update its database. You must wait this long because the T1 card
reboots twice during the initialization process. If you attach a console
cable to the COM1 port on the T1 card and use Hyperterm software to
view the text output from the card, you see status messages associated
with the two reboot processes. See “
Connecting a Computer to a Serial
Port” on page 370.
Another way that you can be sure that it is safe to proceed is to examine
the status lights on the front panel of the T1 card. After the Auto
Discovery process has completed, and before you connect the T1 Digital
Line Card to the telephone company’s T1 line, the CF (Carrier Fail) light
should appear solid green.