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 LAN
users are used to the speed and reliability of their
local networks, and as business needs force LANs to
expand beyond their original limited boundaries, services
such as leased lines, ISDN, X.25, SMDS and frame relay
have been used to interconnect LANs. But users expect
the same speed and reliability for traffic routed over
intermediate metropolitan and wide area links. This
demand places substantial commercial pressure on service
providers and equipment manufacturers to create devices
that can link different communications technologies
into a seamless network.
This need for faster computer networking and higher
speed wide area network services is the key driver of
early ATM applications. ATM has been identified as an
all in-one technology - incorporating backbone, LAN
and WAN into one network architecture. But the current
industry viewpoint is that the implementation of ATM
will only be successful if introduced in a gradual,
incremental approach. The installed base of legacy technologies
must be offered an upgrade path to reduce the entry
cost of ATM. Interworking between installed services
in data communication is therefore key to the success
of ATM.
Topics covered in this application note include the
following:
- Interworking Scenarios
- ATM Interworking Functions
- What is an Interworking Function?
- Where the IWF is Implemented
- Frame Relay Interworking with ATM
- Traffic Mapping
- Connection Multiplexing
- Discard Eligibility and Cell Loss Priority Mapping
- Congestion Indication
- Link Integrity Management
- Service Interworking
- SVC Network Interworking
- Internetworking Test Requirements
- Connectivity Testing
- Testing the Discard Priority Mapping
- Handling Faulty Traffic
- Performance Issues
- Testing Framing Capacity
- Testing Buffers
- Testing Receiver Synchronization
- Testing Backplane Performance
- Traffic Profiles
- Service Testing in a Network
- Background and Reference Information
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