Correlator – Backend System Overview 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview Major Components Correlator M & C Backend The dashed lines surround the components of the Correlator System. Lag frame data (wide arrows) flows from the Correlator to the Backend and then on to the End-to-End System. Control and other data (control commands, status reports, error messages, metadata, etc. – thin arrows) flows among the various systems, but the Backend communicates directly only with the Monitor and Control (M & C) System. e2e 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview 14-15 May, 2002 Correlator - Backend System Overview

Correlator-Backend Network 160 (27-32 Antennas) Minimum to 336 (48 Antennas) Correlator Connections ~50 Backend Connections Maximum Aggregate Transfer Rate of 1.6 Gbytes /sec Gbit / sec switch 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview Backend to e2e Network Maximum Aggregate Transfer Rate of 25 Mbytes / sec ~ 50 Backend Connections Network vs. Direct Channel Attached to Archive System 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview Observational Modes Continuum Spectral Line Pulsar Bursting Sub-array 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview Output Data Frames 266, 32-Bit Words (1064 Bytes) 1 or More Frames per Packet Frames Include all Data Needed For Lag Set Assembly All Frames From Same Baseline go to One BE Processor 14-15 May, 2002 Correlator - Backend System Overview

Direct Correlator Data Products Antenna ID Baseband ID Sub-band ID Recirculation Block Number Frame Count Status Bits 14-15 May, 2002 Correlator - Backend System Overview

Direct Correlator Data Products Phase Bin Number Sample Valid Count Time Stamp Checksum Correlation Lag Values 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview Correlator Lag Values In-phase and Quadrature Stored as Real And Imaginary Pairs 32-bit, 2’s Complement Integers 14-15 May, 2002 Correlator - Backend System Overview

Correlator - Backend System Overview Indirect Data State Counts (Correlator Produced) Correlator Configuration Integration Rate Processing Applications and Parameters Meta Data Needed for Formatting 14-15 May, 2002 Correlator - Backend System Overview