3Com Nbx 100 And Ss3 Nbx Administration Guide

							Configuring and Managing T1 Digital Line Cards291
Connecting the T1 Line and Activating the Span
To connect the T1 line and activate the span:
1Plug the T1 line into the T1 Digital Line Card.
2Return to the Digital Line Cards tab (Figure 113
).
3From the Select Device Type list, select T1/ISDN Board List.
4Click Apply.
5From 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.
6Click Modify. The Modify Board dialog box (Figure 114
) appears.
7Click the On Line check box.
8Click Apply.
9Click OK.
10In the T1/ISDN Board List, verify that the entry for this card in the Status 
column changes from Offline to Online. You may need to wait a minute 
or two, and then refresh your browser window to see this change.
Verifying the T1 Span Status
To verify the T1 span status:
1Return to the Digital Line Cards tab (Figure 113
).
2Select T1 Span List from the Select Device Type list.
3Click Apply.
4Select the span and click Modify.
5Enable the On Line check box.
6Click OK.
7Verify that the word Ready appears next to the T1 span list line item that 
corresponds to this span.
Configuring T1 Groups (DS1)
To configure a T1 DS1 Group:
1Return to the Digital Line Cards tab (Figure 113
).
2From the Select Device Type list, select T1 Group List.
3Click Apply. 
						

							292CHAPTER 3: DEVICE CONFIGURATION
4From the T1 Group List, select Group 1.
5Click Modify. The Modify Group dialog box (Figure 115
) appears.
Figure 115   Modify Group Dialog Box — T1
The fields in the Modify Group dialog box contain default values. No 
default values are assumed for Called Party Digits or Calling Party Digits.
6Modify the Wink Wait value:
aSelect Wink Wait from Time Values list.
bType 3000 in the New Value text box.
cClick Apply.
dAsk your telephone service provider to set their Wink Wait value to 
3000 msec.
7Modify the Guard Value:
aSelect Guard from Time Values list.
bType 2200 in the New Value text box.
cClick Apply.
dAsk your telephone service provider to set their Guard value to 
2200 msec. 
						

							Configuring and Managing T1 Digital Line Cards293
8Click the On Line check box.
9Enter 500 in each of the four AutoExt text boxes.
10Click OK.
The NBX system now begins to create the group. If you connect the 
telephone company’s T1 line to the T1 Digital Line Card, or if you connect 
a loopback cable to the T1 card, the Nominal light turns on.
Verifying T1 Group Membership (DS1)
To verify that all channels are in the Member List of a T1 Digital Line Card:
1Return to the Digital Line Cards tab (Figure 113
).
2From the Select Device Type list, select T1 Group List.
3Click Apply.
4From the list, select the group you want.
5Click Membership. The Manage Group Membership dialog box 
(Figure 116
) appears.
Figure 116   Manage Group Membership Dialog Box
6Scroll through the Member List to verify that all 23 channels are present 
for each T1 Digital Line Card in the system. 
						

							294CHAPTER 3: DEVICE CONFIGURATION
Completing the T1 Configuration (DS1)
To complete the T1 installation:
1Return to the Digital Line Cards tab (Figure 113
).
2From the Select Device Type list, select T1 Channel List.
3Click Apply.
4Wait 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:
1In the NBX NetSet - Main Menu window, click Device Configuration.
2Click the Digital Line Cards tab. 
						

							Configuring and Managing T1 Digital Line Cards295
3From the Select Device Type pull-down list, select T1 Span List.
4Click Apply.
5Select the span for which you want to set echo cancellation.
6Click the Audio Controls button. See Figure 117
.
Figure 117     Audio Controls for a T1 Digital Line Card
7Enable the Echo Canceller Enabled check box to turn on echo 
cancellation.
8Click OK. 
						

							296CHAPTER 3: DEVICE CONFIGURATION
Configuring a T1
Digital Line Card for
ISDN PRI SignalingThese 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”, in Chapter 10.
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.
T1 ISDN PRI Configuration
When you configure a T1 Digital Line Card for ISDN PRI operation, verify 
that the Auto Discover Digital Line Cards check box is enabled (System 
Configuration > System Settings > System-wide).
To configure the T1 card for ISDN PRI signaling:
1In the NBX NetSet - Main Menu window (Figure 110
), click 
Device Configuration. 
2Select the Digital Line Cards tab (Figure 113
).
3From 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.
4Click Modify. The Modify Board dialog box (Figure 118
) appears. 
						

							Configuring and Managing T1 Digital Line Cards297
Figure 118   Modify Board Dialog Box — T1 ISDN PRI
5To change the name of the T1 Digital Line Card, enter a new name in the 
Board Name field. You can use alphanumeric characters, dashes, and 
underscores. The maximum name length is 30 characters.
6From the Card Type pull-down list, select ISDN PRI.
7Click OK. The Digital Line Cards tab (Figure 113
) reappears.
8Wait until the entry for this Digital Line Card in the Ty p e column changes 
to PRI. To see the change, you may need to wait a minute or two, and 
refresh your browser window.
9After the board type changes, from the Select Device Type pull-down list, 
select ISDN PRI Channel List.
10Click Apply. The dialog box (Figure 119
) is updated to show the 
ISDN PRI Channel List. 
						

							298CHAPTER 3: DEVICE CONFIGURATION
Figure 119   ISDN PRI Channel List Dialog Box — T1 ISDN PRI
11Verify that the highest channel in the Chan column is 23.
When you configure a T1 Digital Line Card for ISDN PRI signaling, one of 
the 24 channels is allocated for signaling, leaving 23 for data (voice).
Connecting the T1 Line and Activating the Span
To connect the T1 line and activate the span:
1Plug the T1 line into the T1 Digital Line Card.
2Return to the Digital Line Cards tab (Figure 113
).
3From the Select Device Type list, select T1/ISDN Board List.
4Click Apply.
5From the list, select the new T1 Digital Line Card.
To identify the card, look for those cards that have PRI in the Type column 
and use the MAC address to identify the specific card. You recorded the 
MAC address before inserting the card. 
						

							Configuring and Managing T1 Digital Line Cards299
6Click Modify. The Modify Board dialog box (Figure 120) appears.
Figure 120   Modify Board — T1 ISDN PRI
7Click the On Line check box.
8Click OK.
9In the T1/ISDN Board List, verify that the entry for this card in the Status 
column changes from Offline to Online. You may need to wait a minute 
or two, and then refresh your browser window to see this change.
Verifying the Change in Span Status
To verify that the Span status changes from Offline to Ready:
1Return to the Digital Line Cards tab.
2Select ISDN PRI Span List from the Select Device Type list.
3Click Apply.
4Select the span from the list and click Modify.
5Enable the On Line check box and click OK.
6Verify that the word Ready appears in the ISDN PRI Span List line item 
that corresponds to this span. 
						

							300CHAPTER 3: DEVICE CONFIGURATION
Configuring T1 Groups (ISDN PRI)
To configure a T1 ISDN PRI Group:
1Return to the Digital Line Cards tab (Figure 113
).
2From the Select Device Type list, select ISDN PRI Group List.
3Click Apply.
4From the ISDN PRI Group List, select PRI Group 1.
5Click Modify. The Modify Group — T1 ISDN PRI dialog box (Figure 121
) 
appears.
Figure 121   Modify Group Dialog Box — T1 ISDN PRI
6To modify the name of the group, enter a new name in the Group Name 
field. You can use alphanumeric characters, dashes, and underscores. The 
maximum name length is 30 characters.
7To prohibit call transfers between trunk lines, select Restricted (the 
default value) from the Tr u n k  t o  Tr u n k pull-down list. Otherwise, select 
Unrestricted.
8Click the On Line check box.
9Verify that 500 (the default) is in each of the four AutoExt text boxes.
10Click OK.