
Configuring Dial Services
3-10 114062 Rev. A
BRI Leased-Line Operation for Germany
For BRI service in Germany, the router allows you to support a permanent,
point-to-point ISDN connection over a B channel without having to use the D
channel to dial the call. This connection operates like a leased line. This option is
useful when ISDN service providers do not use the D channel.
Leased-line operation supports PPP, Bay Networks Standard, and Frame Relay
protocols.
Site Manager allows you to select leased-line operation when you configure the
application mode for your BRI interface. Refer to Chapter 7 for more information.
BRI Subaddresses
The ITU-T specifies that the same S/T interface can have eight different TE
devices, for example, routers. However, the service provider may assign only one
phone number for the customer-side of the local loop. To determine the specific
destination of the call, the router uses a subaddress.
Each router has an assigned subaddress for which it will accept calls. The
subaddress must be part of the incoming call setup message sent to the router.
Based on the subaddress, the router determines if the call is intended for it. If not,
it ignores the call.
Floating B Service for the AN and ANH
If your ISDN service provider only offers 2B + D service, the floating B option for
the AN and ANH enables you to use only one B channel for dial service
applications. Floating B is an alternative if you cannot purchase 1B + D service.
Prior to the floating B option, if your service provider offered only 2B + D
service, the AN and ANH CPU would use two of its four Serial Communications
Controllers (SCCs) for the two B channels, one SCC for the Ethernet link, and one
SCC for a synchronous link. With floating B, you use only one B channel at a
time, freeing up an SCC for an additional synchronous link.
Comentarios a estos manuales