RAD Data comm MPW-1 Specifications download pdf (Page 21)

Installation and Operation Manual Chapter 1 Introduction

MPW-1 MP-4100 Ver. 2.0 Functional Description 1-9

The MPW-1 module includes the following main subsystems:

• TDM subsystem, including:

 Signaling and TDM bus interfaces

 TDM cross-connect matrix

 Internal DS1 ports

• Pseudowire processing subsystem, including:

 Pseudowire cross-connect matrix

 Packet processors

• Ethernet subsystem, including:

 Layer 2 Ethernet switching subsystem

 Ethernet port interfaces (transceivers)

 Ethernet termination and processing

• Timing subsystem, including:

 Pseudowire recovered clock generator

 Internal clock timing generator

• Local management subsystem.

TDM Subsystem

TDM and Signaling Bus Interfaces

The function of these bus interfaces is to connect the MPW-1 module to the TDM

and signaling buses of the Megaplex-4100 chassis.

The TDM bus interfaces are used to transfer payload destined to the internal DS1

ports located on the MPW-1 module. The payload is transferred from the

Megaplex-4100 buses to the bus side of the cross-connect (routing) matrix of the

module, in accordance with the commands received from the CL module.

Pseudowires can also be transfer signaling information (this is necessary to

support voice traffic).

TDM Cross-Connect Matrix

The MPW-1 module includes a TDM cross-connect matrix that controls the routing

of payload within the module, that is, between the TDM and signaling interfaces

and the internal DS1 ports, under the control of the CL module.

Actually, it is the way the TDM cross-connect matrix performs cross-connect

operations that creates the internal DS1 ports. The user can select between two

cross-connect modes, separately for each internal DS1 port:

• DS0 cross-connect mode – used when it is necessary to control the routing

of individual timeslots, and therefore it is relevant only when the internal DS1

port uses the framed mode.

• DS1 cross-connect mode – used when the traffic of the internal DS1 port is

handled as a whole. This means that when the port uses the unframed mode,

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RAD Data comm MPW-1 Specifications Page 21