Recorders for eVLBI

1
Recorders for e-VLBI

• Next Generation VLBI recording
• Craig West

2
Current System

• S2 recorders - with 8 banks of video recorders
• Data rate of 128 Mb/s - e.g. 2x16MHz bands
• Purpose built hardware correlation

3
Swinburne System - Hardware

• Based on PCEVN recorders
• Built using Metsähovi Radio Observatory VSIB/VSIC
  hardware

4
Swinburne System - Computer

• Dell PowerEdge 1600SC Apple XRaid
• Server class computer
• Currently 2.05TB storage

5
Swinburne-MRO and other recorders

• Dell PowerEdge machines
• Capable of 600Mb/sec sustained to disk
• External storage 2TB
• Dual processor capable - extra overheads
• Compatible machines (Dodson/Briggs)
• Capable of 800Mb/sec sustained to disk
• internal storage 1TB

6
DAS - Converter - Computer - Disk

• DAS - VSIC
• Currently uses S2RECOUT connectors
• VSIC - VSIB
• VSIC produces VSI compliant connection
• VSIB - Disk
• 'wr' program records data from VSIB (DMA card)
• Disks are transported to central processor

7
Data Rates and Space

• 128 Mb/sec (S2) - 2 x 16 MHz bands
• 36 hours of recording
• 256 Mb/sec (S2 x2) - 4 x 16 MHz bands
• 18 hours of recording
• Larger 250GB drives
• 256Mb/sec - 27 hrs recording
• Larger data rates - 512Mb/sec current hardware

8
Other Recorders - World Wide

• PCEVN
• Mark 5 (using MarkIV formatters)
• K5 (Japanese recorder)
• Others...
• Solution - Software, unified unpacker -
  Conversion between formats

9
ATCA
10
PARKES
11
MOPRA
12
CEDUNA
13
HOBART (Mark5)
14
HART (Mark5)
15
PIE TOWN (Mark5-VLBA)
16
KASHIMA