
Implementation Notes for All Dial Services
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You can use floating B if your network integrates an ISDN dial backup connection
with network devices that send protocol traffic such as SDLC or X.25. This type
of application requires the following interfaces:
• One synchronous interface for SDLC or X.25 traffic
• One synchronous interface for the primary link to the backbone network
• One ISDN B channel for the dial backup link
If you use 2B + D service without configuring floating B, the AN provides only
one synchronous interface, so you cannot integrate the dial service with other
network applications. However, by configuring floating B, you can configure two
synchronous interfaces: one Ethernet link and one B channel. The router software
maps whichever B channel is in use to a single SCC.
To implement the floating B option, configure the port application mode for that
option (see Chapter 2, “Starting Dial Services Using Site Manager” or Chapter 3,
“Starting Dial Services Using the BCC”). The router makes the necessary
adjustments so that only one B channel is available.
PRI Service on the ASN, BLN, and BCN
The ASN, BLN, and BCN provide PRI service on the following modules:
• Single or Dual Port Multichannel T1 Link Module (BLN and BCN)
• Dual Port Multichannel T1 Net Module (ASN)
• 120-ohm Single Port MCE1-II Link Module (BLN and BCN)
• 120-ohm Single or Dual Port MCE1-II Net Module (ASN)
• QMCT1 Link Module (BLN and BCN)
PRI allows you to connect directly to the ISDN network instead of connecting via
a terminal adapter. PRI is a cost-effective solution when the number of BRI
channels required for an application exceeds the cost of a single PRI line. The cost
savings depend on each country’s tariffs.
All three dial services can use PRI connections. Subsequent chapters in this
manual describe how to configure each service to connect to an ISDN network.
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