• Topic ID: id_18718503
  • Version: 1.0
  • Date: Sep 20, 2018 2:03:12 PM

LCGOC Theory

1 LCGOC Overview

The Global Operator Console (LCGOC) consists of the following components.

  • The Data Acquisition and Recon Control2 (DARC2) Component - incorporates the Scan Data Disk Array (SDDA) component from the previous console GRE/GOC3.

  • Intercom Component - Is now a standalone component removed from the GRE/GOC4 SDDA and redesigned for better reliability and volume control.

  • Cooling Package, including:

    • Fans

    • Front and Rear Covers with Foam Insulation

    • Air Filter

Following components are optional for LCGOC.

  • Image Generator (IG) Component

  • MOD Drive in SCSI Tower.

2 LCGOC Recon Theory

The LCGOC can work in two different modes: .

  1. No IG (Standard Configuration)

  2. One IG (Same as GOC4)

2.1 DARC Recon

The standard configuration LCGOC is without IG. In this mode, the images are generated by DARC2 node. The DARC2 node receives raw data from the Data Acquisition System (DAS) through an on-board Data Interface processor (DIP) card, and stores that data in the Scan Data Disks located in the DARC2. The raw data is then delivered from the scan data disks in the DARC2 to the software processes on the DARC2. The software processes then create images using on-board processors. The images generated are sent to the Host Computer.

2.2 IG Recon

If one optional IG is added, LCGOC works in the same way as GOC4 with one IG. The DARC2 node receives raw data from the Data Acquisition System (DAS) through an on-board Data Interface processor (DIP) card, and stores that data in the Scan Data Disks located in the DARC2. The raw data is then delivered from the scan data disks in the DARC2 to the IG node. The IG nodes then create images using on-board processors and Recon Accelerator Cards (RAC). The images generated by the IG nodes are sent back to the DARC2 node, which gathers the images and sends them to the Host Computer. Though each IG node will have a floppy boot disk, the DARC2 node should be capable of booting IG node via Gigabit Ethernet, using Serial Over LAN (SOLAN) functionality. The host computer for the LCGOC console will be an off-the-shelf, Linux-based system, which meets EMC requirements per CISPR 11.

For detail theory about the components of LCGOC, refer to GOC4 Theory.