Yuhang, Marc, Michael
We took inventory for the computer equipment located at TAMA that is required for the DGS upgrade. Specifically, we would like to increase the number of ADC/DAC channels to accommodate new QPDs that should be installed. However, our current computer system is full, and we would like to install new frontend PCs to operate the additional channels. By adding a new PC(s), we have to go from standalone to network configuration. In a network configuration, synchronised data acquisition is achieved using the Dolphin network equipment. A summary of the principles and components of the ALIGO timing system is written by Yoichi Aso et al. "Advanced LIGO Timing System: Final Design" LIGO-T070173-00-D
1000BASE-LX/LH SFP 1310nm 10km Transceiver Module: 2 boxes of optical fiber transceivers (USB-stick sized optical to electronic transceiver)
24-Port Gigabit PoE+ Managed Switch with 2 1Gb Combo and 2 10Gb SFP Uplinks, 440W: 1 unit. Large black chassis. Model number S3410-24TS-P.
24-Port Gigabit L2+ Stackable Managed Switch with 4 10Gb SFP+: 3 units. Large grey chassis. Model number S3910-24TS.
48-port Gigabit PoE+ Managed Switch with 4 SFP+, 400W: 2 units. Large grey/black chassis. Model number S3400-48T4SP.
Thick 5m optical fiber cables: 3 units. SA-444L-5M-S2.
Digital to analogue converter: 2 units of PCI express cards. PCIe-16AO16-16-F0-DF.
Analogue to digital converter: 2 units of PCI express cards. PCIe-16AI64SSC-64-50M.
Dolphin PCIe Gen 3 PXH830 non-transparent bridge adapter card: 3 units (in nondescript brown boxes)
Adnaco PCIe epxansion host card and chassis: One unit. ADNACO-S2B-01-000 card and Adnaco-C2B chassis.
Myricom card: One unit. Used for ultrafast communication of frontend PC to data concentrator.
Senetem CAT.7 flat cable, 10 Gb LAN: 6 units 2m, 6 units 5m.
10m thin optical cable: Unlabelled. Blue colour.
IRIG cables: One box. Used for communication from GPS receiver to timing system to retreive the absolute GPS time.
DGS Timing Card: One unit. Spectracom, located in bag "DGS Timing Card". I'm guessing it coordinates GPS absolute time with the 1PPS GPS synchronisation signal.
Dolphin MXS824 24 port PCIe Gen 3 switch: One unit. Large black chassis.
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Some already installed computer units:
1. Model # CSP-30EGSR4, SN CS6279 (next to PR tank)
2. Model # CSP-32XES, SN CS6257 (rack next to south arm, upper left)
3. Model # CSP-30EGSR4, SN CS6285 (rack next to south arm, upper right)
4. Model # CSP-38XQDR4, SN CS6278 (rack next to south arm, middle)
5. Model # 813M-3, SN BT0-2947105-001 (rack next to south arm, bottom)
Katsuki, Marc
We found the GPS receiver on the left of the network rack in the storage room (see attached pictures).
We tried to follow the black cable that seems to indeed go to the roof of the central building.
While LIGO recommends to have the cable between the GPS antenna and receiver as short as possible, our cable is really long so we should be able to have our GPS receiver on the rack close to the input mirror.
The GPS receiver user guide is accesible here : www.leapsecond.com/museum/hp59551a/097-59551-02-iss-1.pdf
The allocation of the computers is the following:
CSP-38XQDR4: FE computer for Center Area
CSP-30EGSR4: FE computer for End Stations
CSP-32XES: DAQ computer (to run DataConcentrator, FrameBuilder and NDS servers. Also, the IRIG-B card should be installed into this computer.)
813M-3, SN BT0-2947105-001: Probably a server for GigE camera