Instruction manual

Networking and connectivity
555-233-767122 Issue 4 May 2003
Port Network Connectivity (ATM-PNC)
ATM Port Network Connectivity (ATM-PNC) provides an alternative to the
Center Stage Switch (CSS) configurations for connecting the Processor Port
Network (PPN) to one or more Expansion Port Networks (EPN). ATM-PNC
replaces the CSS in a DEFINITY R8r and later network with an ATM switch or
network. ATM-PNC is available with all three Communication Manager
reliability options — standard, high, and critical. In addition, it offers ATM-PNC
duplication.
ATM-PNC integrates delivery of voice, video, and data via ATM over a
converged large-bandwidth network, providing reduced infrastructure cost and
improved network manageability. ATM-PNC uses standards-based open
interfaces that can be provisioned with either new or existing systems running
Communication Manager.
Port Network Connectivity (ATM-PNC) over
WAN
ATM-PNC over a public Wide Area Network (WAN) represents an environment
where the customer uses a service provider's ATM network between
privately-owned ATM switches. The customer does not control the ATM switches
in the network, including traffic policing policies and product quality.
Using a public WAN, Permanent Virtual Paths (PVP) may be set up between
customer-owned ATM switches similar to the dedicated circuits in a private WAN.
However, ATM cell processing occurs in a public WAN so the customer is
dependent on ATM switches owned and managed by the service provider.
Switched Virtual Circuits (SVC) use the ATM protocol to transmit voice-like
applications over ATM networks. The advantage of the SVC solution is that
Communication Manager can dynamically signal the ATM network to provide
more bandwidth as needed to handle peaks in the call traffic. If the ATM network
cannot handle the additional traffic, calls will be denied.