1. PALM-3000 ATST/BBSO Visit Stephen Guiwits P3K System Hardware 126 Cahill February 11, 2010

2. PALM-3000 Agenda High level overview of the P3K Electronics P3K System Hardware –RTC Electronics –Interfaces and Layout Xinetics GenIII Communications –High Speed –Low Speed Xinetics GenIII Drivers –Stability –Features

3. PALM-3000 Overview

4. PALM-3000 RTC Electronics Cluster of 10 PC’s in the computer room Real-time calculations performed on 16 Nvidia GPU’s PC 0 provides the servo control, central scheduling, and control of the cluster PC 1 – PC 8 provides GPU calculations PC 9 is dedicated to telemetry recording Cluster communication provided by the high speed Quadrics switch QsNet II (16 way solution) 1064 Mbytes/s 900 MB/S Sustainable 4

5. PALM-3000 5 RTC Electronics RAID System –NexSAN Technologies –Configured for throughput optimization RAID 0 Two partitions –High Speed data –All other data Optical Splitter provides duplicates frames to all 8 PC’s All PC’s running Red Hat Enterprise Linux 5 –Kickstart set up for automated, repeatable installations –Custom RPMS built and tested specifically for P3K

6. PALM-3000 6 RTC Electronics PC 0 – 9 RAID System KVM Switch Quadrics High Speed Switch 16 Port Gigabit Ethernet Switch Optical Splitter

7. PALM-3000 Electronics Interfaces and Layout Wavefront Processor (computer room) DM Racks (Cass cage pos. 2 & 3) Controller Racks (Cass cage pos. 4 & 5) User Workstation (Data Room) Fiber Splitter AO Bench Ethernet Pvt net

8. PALM-3000 8 Xinetics GenIII Communications P3K Requires high speed communication and low speed communication with the Xinetics GenIII Drivers Low Speed (serial interface) to configure and monitor driver states High Speed (SOR-422U) for DM control

9. PALM-3000 High Speed Communications

10. PALM-3000 10 High Speed Communications Transmit End Curtiss Wright FibreXtreme SL240 PCIe 2.5 Gb/s Data Link Card –Up to 247 MB/s per channel sustained data rate per channel –Low overhead ANSI/VITA 17.1-2003 Serial FPDP Protocol Based on Fiber Channel. Uses similar ordered sets –Low latency (about 1us) –4 independent channels

11. PALM-3000 High Speed Communications Receive End Curtiss Wright FibreXtreme SL240 CMC 2.5 Gb/s Data Link Card –IEEE P1386 Common Mezzanine Card form factor (same as PMC) –32-bit parallel FPDP data bus @ 62.5 MHz Custom Carrier Board –6U VME form factor. FPGA based. –Four SOR-422U parallel output ports for connection to Xinetics Drivers. –P1 port for connection to LODM and TTM amplifiers.

12. PALM-3000 Low Speed Communications Serial Communication @ 115200 Baud Communicate with each driver through a terminal server –Terminal server has 16 RJ 45 ethernet ports –Each driver has a 9 pin DE 9 connector –9 pin – RJ 45 adapter required Drivers have a Primary/Secondary configuration –Specially developed by Xinetics for P3K 12

13. PALM-3000 Xinetics GenIII Drivers Software –Written for the low speed serial interface –Communicates via serial terminal server PC  ethernet  terminal server  RJ-45  9 pin  driver Certain commands are required for each driver while others are only required by the Primary driver –Commands tested for all 8 drivers Power up Power down Put driver in proper mode (Normal or Test) Clear faults on the drive (Xinetics feature) Mute the drivers Drive actuator values Drive bias value Read back voltage table (needs adjusting) Read status table

14. PALM-3000 Xinetics GenIII Drivers Stability –Idle issues. Random driver will fault when powered on and not used –Work well after running Had multiple runs over a 48+ hour period –Thousands of commands sent to date Features –Daisy Chain Developed for P3K by Xinetics –Undocumented software API –API bugs must be worked around (trial and error) 14

15. PALM-3000 Questions, Comments, Suggestions