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Implementation Notes for All Dial Services
114062 Rev. B 4-13
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, select Dialup - Floating B for the Port
Application Mode parameter (refer to Chapter 8). 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 using the following modules:
120-ohm Single Port MCE1-II Net Module (ASN only)
Single or Dual Port MCT1 Link Module (BLN and BCN only)
120-ohm Single or Dual Port MCE1-II Link Module (BLN and BCN only)
QMCT1 Link Module (BLN and BCN only)
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.
B Channel Support
In keeping with the PRI standard, each port on the MCT1 Link Module provides
23 B channels operating at 64 Kb/s for data transmission. Each port on the MCE1
Link Module provides 30 B channels operating at 64 Kb/s for data transmission.
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