Paradyne FrameSaver NP 110, User Manual

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2 Description
2-4 FrameSaver NP 110 User’s Manual - Installation Guide 980-001-0240B
November 2000
ISDN Adapter
Option The FrameSaver NP 110 can also be factory-optioned to include an integral ISDN
Adapter module.
The ISDN adapter includes four “U” ISDN TA Interfaces with two integral NT1 In-
verse Multiplexers, thereby providing up to 512 Kbps of switched connectivity for net-
work Backup and/or additional Bandwidth On-Demand.
ISDN Backup
Backup in Frame Relay Protocol utilizing the Router’s Primary Port can be via dedi-
cated PVCs on an alternate port, or the frame switch manager may reroute the original
PVCs to the Backup Frame Switch. It is also possible to bypass the entire Frame Relay
Network and initiate backup to a pool of ports on an alternate Frame Switch connected
directly to another Router.
A typical network configuration showing the backup connection to a Backup Frame
Switch using rerouted PVCs is shown in Figure 2-4.
Figure 2-4 Typical Backup Configuration
The backup process is described as follows:
•
FrameSaver NP 110 detects loss of connectivity at CSU.
•
ISDN Adapter card calls Backup Frame Switch and is identified by caller ID.
•
Frame Switch Manager either reroutes original PVCs, or Frame Switch uses
alternate PVCs for the backup connection.
•
FrameSaver NP 110 switches the data path when connected.
•
Associated routers determine that PVCs have been established through LMI
enquiries.
•
Communication is resumed.
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