Specifications

Metro Packet Switch
iDEN® System
August 08, 2000 68P81095E55-E 2-9
Metro Packet Switch
Physical Components
The Metro Packet Switch (MPS) is a subsystem that connects the EBTS frame relay
connections to the Dispatch Application Processor and the Packet Duplicators. It
consists of the system cabinet and attachment point for frame relay span lines.
Figure 2-4 Metro Packet Switch
Functional Characteristics
The MPS is a Frame Relay digital data packet switch. The MPS manipulates the
paths dispatch voice packets use during a Dispatch call and the data packet paths
during a Packet Data networking. For group dispatch calls and data network
multicasts, the MPS routes packets to and from the Packet Duplicators (PDs) and
Advanced Packet Duplicators (APDs) to the appropriate destination. The MPS also
routes control and signalling information between the DAP, MDG and the EBTS
sites.
The source and destination definitions for routing and movement of voice and data
packets (signalling) is under the control of the Dispatch Application Processor. The
MPS controls the overhead and manages the flow of voice and data between the
associated dispatch network elements.
The MPSs are usually implemented in a tiered architecture (Figure 2-5). One or
more MPSs control the routing of voice and data between the PDs and the Dispatch
Application Processor cluster, and a second tier of MPSs that actually route the data
the appropriate radio in the correct EBTS.