Nortel BCM 3.7, Руководство пользователя, Страница: 699 / 1004

ISDN dial up 699
Programming Operations Guide
3 Click the Save button.
Assigning an ISDN dial number and IP address
With an ISDN demand-dial interface, you can bundle more than one ISDN channel to increase the
throughput. This is referred to as multi-link support.
With each ISDN channel configuration, you can choose to configure a primary dial number
(Phone1), and a backup dial number (Phone2). However, you are not allowed to assign different IP
addresses for the different phone numbers you are dialing. The main reason behind this restriction
is, with multi-link, even if you can reach your destination via different phone numbers, once your
ISDN pipe is established, there is only one source and one destination from the IP-layer.
If you assign Phone1 to reach Site A and Phone2 to reach Site B, and Site A and Site B belong to
different subnets, the pre-assigned IP address scheme will not work. In this scenario, you must use
the Remote Assigned IP address option, and let NetLink Manager take care of the default route for
you. For information about setting the IP Address to the RemoteAssigned, refer to
“Configuring an
ISDN interface” on page 696 . For information about configuring Net Link Manager, refer to
“Configuring Net Link Manager” on page 733 .
Modifying the characteristics of an existing ISDN channel
1 Click the ISDN Channel Characteristic you want to modify.
2 On the Configuration menu, click Modify ISDN Channel.
The ISDN Channel Characteristics screen appears.
3 Make the necessary changes.
4 Click the Save button to save your settings.
Deleting an ISDN channel from the ISDN Channel Characteristics list
1 Click the ISDN Channel Characteristic you want to delete.
2
On the Configuration menu, select Delete ISDN Channel.
A confirmation dialog box appears.
3
Click the Yes button.
Line Type Select either a 64K Digital or 56K Digital line.
Business Communications Manager ISDN supports two types of Unrestricted Digital
Information (UDI) bit streams: UDI, and UDI-56. With UDI, data is transmitted at 64kbps (64K
Digital). With UDI-56, a 1 bit is inserted in the eighth bit position of each B-channel time slot
while the other 7 bits form the 56kbps channel (56K Digital).
Negotiate Line
Type Choose whether or not the system will select a line with a slower speed if it is unable to connect
at the previously set speed.
You can choose Yes or No. The default value is Yes
Table 192 ISDN channel characteristics (Continued)
Attribute Description