An individual RPR device usually
contains other technologies to create a fully functioning system. Interface ports
to an RPR switch may be SONET/SDH, TDM, Ethernet or a combination of both. In
addition, VCAT and LCAS may be added to more efficiently fill SONET/SDH circuits.
MPLS and pseudo-wires can be added for traffic management and service interworking.
All of these technologies provide a backbone for high bandwidth service aggregation
and connectivity.
Consumers or Enterprise data and voice service customers are often unaware of
the existence of RPR in the networks their data traverses. However, it is often a critical
component that ensures that they receive the Service Level Agreements they are
promised in their contracts.
The RPR portion of the network will sometimes begin at the Broadband Loop Carrier.
This is the first aggregation point in the network for many customers. One level up
360 Chapter 12
from that is where the aggregation of circuits and packets occurs. In this metro aggregation
portion of the network, Multi Service Provisioning Platforms (MSPP) or
Packet Transport Switches (PTS) aggregate traffic from DSLAMs, wireless base stations,
SONET/SDH and Ethernet ports for transmission in the metro and regional
networks.
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