294
C
HAPTER
3: D
EVICE
C
ONFIGURATION
Completing the T1 Configuration (DS1)
To complete the T1 installation:
1
Return to the
Digital Line Cards
tab (Figure 113).
2
From the
Select Device Type
list, select
T1 Channel List
.
3
Click
Apply
.
4
Wait approximately 30 seconds for the status of each channel to change
from Ready to Idle.
While you are waiting, you may click
Apply
to refresh the list of channels
and to see the updated status. If you have connected the Telephone
company’s T1 line to the T1 Digital Line Card or if you have connected a
loopback connector to the T1 card, the
Nominal
status light on the front
panel of the T1 board should now turn on (solid green). If the
Nominal
status light does not turn on and you have the telephone company’s T1
line connected, disconnect the T1 line and connect a loopback connector.
If the
Nominal
light now turns on, contact the telephone company for
assistance with the T1 line. If the
Nominal
light does not turn on, contact
3Com Technical Support.
Enabling and Disabling Echo Cancellation
There are two situations in which it may be desirable to disable echo
cancellation on a T1 Digital Line Card.
■
An NBX system is connected to a telephone carrier (Central Office) by
a T1 Digital Line Card, and the telephone carrier guarantees to provide
echo cancellation on all channels, all of the time.
■
Two NBX systems are connected together directly using T1 Digital Line
Cards and the network between the two is completely composed of
digital circuitry, thus eliminating sources of echo.
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
In the
NBX NetSet - Main Menu
window, click
Device Configuration
.
2
Click the
Digital Line Cards
tab.
Summary of Contents for NBX 100
Page 14: ......
Page 18: ...18 ABOUT THIS GUIDE ...
Page 26: ...26 CHAPTER 1 INTRODUCTION ...
Page 138: ...138 CHAPTER 2 DIAL PLAN ...
Page 322: ...322 CHAPTER 3 DEVICE CONFIGURATION ...
Page 328: ...328 CHAPTER 4 USER CONFIGURATION ...
Page 412: ...412 CHAPTER 10 TROUBLESHOOTING ...
Page 458: ...458 APPENDIX B ISDN COMPLETION CAUSE CODES ...
Page 480: ...480 GLOSSARY ...
Page 492: ...492 INDEX ...