POST CORRELATOR INTEGRATOR

SOFTWARE

DATA DICTIONARY

DOCUMENT NUMBER:

PROJECT:	RTD ERB4062PL975013

ISSUE:	DRAFT

DATE:

i.	AMENDMENT RECORD

ii.	TABLE OF CONTENTS

i.	AMENDMENT RECORD	i

ii.	TABLE OF CONTENTS	ii

1	INTRODUCTION	1

2	THE DATA DICTIONARY	2

1	INTRODUCTION

A Data Dictionary is used to define the terms used in the software modeling. The idea being that in case of doubt and uncertainty it can act as a definitive reference. This document is intended for use with the related documents PCI software analysis and others in the PCI software series.

The format of each entry is as follows:

Entry	Type

description

Attributes:

Methods:

Relationships:

"Entry" is the name of the entry in the dictionary; "Type" is the short of things that "Entry" is, for example, Object if it is an object (in the object oriented sense), or Event if it is an event; "Description" is the description of "Entry"; "Attributes" is a list of attributes of the entry if it is an object; "Methods" is a list of methods of the entry if it is an object; and "Relationships" describes how "Entry" relates to any other entries in the dictionary. Things given in italics in the descriptions have their own entries in the dictionary.

Reference to other documents in the EVN series are followed by their EVN document numbers in parentheses, as in the reference to the EVN Software Analysis above.

2	THE DATA DICTIONARY

Correlators	Hardware

The correlators is a hardware item that takes the data from the Data Distributor, delay corrects the and phase rotates them, correlates and then integrates them.

Relationships:	The results of the correlation/integration process done by the correlators are read by the Data_Handler and the PCI.

Test	Hardware

A correlator board is a hardware item that is part of a correlator segment. A correlator board the data from the Data Distributor, delay corrects the and phase rotates them, correlates and then integrates them.

Relationships:	The results of the correlation/integration process done by the correlators are read by the Data_Handler and the PCI.

Data Distributor	Hardware

The Data Distributor is a hardware item in the EVN Processor. It includes the Recirculators and the Cross-bar Switch. In practice, the Data Distributor can be regarded as part of the Correlators.

PCI	Acronym

See Post Correlator Integrator

Processing board	Hardware

The processing board is part of a PCI segment. It accepts four correlator outputs (C40 comm ports) from a correlator segment. Its main task is to process the correlated data and perform some form of data reduction.

Relationships:	The Processing board receives data coming from a correlator segment and the processed data is send to the Recording board.

Recording board	Hardware

The recording board is part of a PCI segment. It accepts data from four Processing board outputs (C40 comm ports). These four data streams are combined and the resulting stream is written to a SCSI storage device.

Relationships:

Storage device	Hardware

The Storage device is a SCSI tape device connected to the Recording board. It is used to for storing the processed correlator data of one correlator segment.

Relationships: