SYS102Chapter 2 – PCU Architecture

Chapter 2 Objectives

On completion of this section the student will be able to:

• Describe the hardware, software and communication protocols used in the BSS (GPRS) network.

• Describe the main software entities of the PCU and their interaction with the BSS software entities.

• Describe the download and initialisation process.

Packet Control Unit (PCU)

PCU Cage

Packet Interface Control Processor

PCU System Processor (PSP)

PCU Resource Processor

Initial configuration

Cell INS/OOS

Carrier state changes

Carrier Activation

Mobile Originated Packet Access and Transfer

Mobile Originated Packet Access and Transfer

Mobile Terminated Packet Access and Transfer

Gb Interface

Frame Relay Functional Unit

- Transmit and Receive Buffers

- NVRAM MAPPING DLCI + GBL

- DLCI O PVC STATUS MESSAGES

Gb Functional Unit

Gb Functional Unit

Fault Translation Process

System Audit Process

• Monitor the status of the PCU

• Three types of Audit process

- Device Audit Process

- Cage System Audit Process (pCSAP)

- Site System Audit Process (pSSAP)

• MMI Control (OMC, TTY)

Configuration Management

PCU Central Authority Functions

A. Site Initialisation

1. Queries for database for site configuration and equipage.

3. Create Software on DPROCS.

2. Downloading software to the hardware.

B. Initiate and Direct Configuration Changes.

4. Creating routing tables.

5. Creating state tables.

1. Hardware.

2. Software.

3. Updating Router.

4. Updating state tables.