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Clock Distribution for Ice. Cube June 8, 2004 Lawerence Berkeley National Laboratory Gerald Przybylski Clock Distribution for Ice. Cube June 8, 2004 Lawerence Berkeley National Laboratory Gerald Przybylski June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop GTPrzybylski LBNL 10/13/2003

Big Picture Exac. Time ET 6000 GPS Clock(s) US Naval Observatory (~1 E-15 Allan Big Picture Exac. Time ET 6000 GPS Clock(s) US Naval Observatory (~1 E-15 Allan Var. ) UTC Slaved Rubidium Oscillator Inside, -11 < 1 x 10 Allan Var. Master Clock Unit Serial Fan Out 1 pps 10 MHz Balanced Drivers (With Oven Crystal option) DOM Hub DOM Hub Equal Length Twisted Pairs; 10 Mhz, 1 pps, RS-232; Cat 5 E with RJ-45 s ~90 DOM Hubs June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 2 GTPrzybylski LBNL 6/8/2004

Rubidium Oscillator Allan Variance Figure from http: //www. srsys. com/products/PRS 10. htm June 8, Rubidium Oscillator Allan Variance Figure from http: //www. srsys. com/products/PRS 10. htm June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 3 GTPrzybylski LBNL 10/13/2003

Rubidium Clock Phase Noise Figure from http: //www. srsys. com/products/PRS 10. htm June 8, Rubidium Clock Phase Noise Figure from http: //www. srsys. com/products/PRS 10. htm June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 4 GTPrzybylski LBNL 10/13/2003

Accuracy and Precision The US Naval Observatory 20 Atomic Clock array keeps time to Accuracy and Precision The US Naval Observatory 20 Atomic Clock array keeps time to < 2 x 10 -15. GPS Satellites Synchronized to USNO clock. DOMs more stable than XL GPS clocks 40 ns RMS; 150 ns Peak Error; 3 E-10 10 sec Allan variance Radio Propagation Path variations GPS Receiver Local Oscillator jitter. In House Cable Delays; Fixed Phase Shifts GPS Clock -to- Master Clock Unit Master Clock -to- DOM Hub Fan-Out Fan-out -to- DOR FPGA -to- Wire June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 5 GTPrzybylski LBNL 10/13/2003

Inside the DOM Hub Power Supplies Fans Monitors (Possibly Diskless) Cable From Master Clock Inside the DOM Hub Power Supplies Fans Monitors (Possibly Diskless) Cable From Master Clock Unit June 8, 2004 CPU Clk Fan-Out DOR card DOR card Internal, equal length fanout cables 20 MHz (Orange Twisted Pair) 1 Pulse per Second (Green Twisted Pair) RS-232 Time String (Brown Twisted Pair) Ice. Cube DOMHub Hardware Review and Workshop 6 GTPrzybylski LBNL 10/13/2003

The DOR Card Data Buffer SRAM 2 x 256 Kx 16 Cable Interface #0 The DOR Card Data Buffer SRAM 2 x 256 Kx 16 Cable Interface #0 P C I C o r e Cable Interface #1 DOM 1. . 4 Cable Interface #2 Cable Interface #3 DOM 5. . 8 Master Clock DSB: 1 -to-8 Slave Clock Fan-out 10 MHz Altera FPGA EP 20 K 200 E 1 pulse/second Config (Serial) Time String FLASH June 8, 2004 JTAG (PCI Card) 20 MHz Aux. Osc. PCI Bus Altera PLD EPM 7064 1 M x 8 96 V Ice. Cube DOMHub Hardware Review and Workshop KHS 10 -2003 7 GTPrzybylski LBNL 10/13/2003

DOR_Rev 1, Block Diagram Power-sw. #1. . 4 DOM 1. . 4 +/-48 V DOR_Rev 1, Block Diagram Power-sw. #1. . 4 DOM 1. . 4 +/-48 V wired Power-filter #1. . 4 OR n. PON_1. . 4 Cable Interface #0 n. PON_1. . 4 DOM 5. . 8 PCI Core Local Bus Cable Interface #1 Cable Interface #2 Communications Controller Cable Interface #3 Altera EP 1 C 20 F 400 C 8 Master Clock DSB: 1 -to-8 Slave Clock Fan-out (PCI Card) Memory Bus June 8, 2004 Altera EP 1 K 50 FC 256 -1 JTAG Config Clock_sel JTAG 1 PPS Serial JTAG Data Buffer SRAM 2 x 256 Kx 16 20 MHz Aux. Osc. Config PCI Bus-Ctrl Config. PLD Altera EPM 7128 BFC 100 -10 FLASH PLL 2 M x 8 local Osc. QS 5 LV 919 Clock Ice. Cube DOMHub Hardware Review and Workshop 8 K-H Sulanke 6/8/. 04

Signaling Issues: • Maximize Noise Immunity in Counting House - Avoid Winter Noise Storms Signaling Issues: • Maximize Noise Immunity in Counting House - Avoid Winter Noise Storms - Avoid Motor Noise, Welder Noise, etc… • Minimize EMI and RFI - Computers and Instruments • Proven Technology - Price - Component Availability - Track Record June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 9 GTPrzybylski LBNL 6/8/04

Master Clock to DSB Like 802. 3 RS-485 June 8, 2004 Ice. Cube DOMHub Master Clock to DSB Like 802. 3 RS-485 June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 10 GTPrzybylski LBNL 6/8/04

DSB to DOR LVDS June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop DSB to DOR LVDS June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 11 GTPrzybylski LBNL 6/8/04

Master Clock Features [PY 03, this year] • Single ET 6000 (Xtal, or Rubidium? Master Clock Features [PY 03, this year] • Single ET 6000 (Xtal, or Rubidium? ) - OCXO: 10 Sec Allan Variance 2 E-11, -120 d. Bc/Hz Phase Noise - Rubidium: 10 Sec Allan Variance 1 E-11, -91 d. Bc/Hz Phase Noise • 10 MHz from Half the Optional Outputs - Drive LEMO Inputs through coax • 1 Hz from Half the Optional Outputs - Drive LEMO Inputs through coax • RS-232 from (DTR) DB-9 - Daisy-Chain cable • Cold Spare in Rack • Heated “Radome” on TCH Roof (>-40°C) June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 12 GTPrzybylski LBNL 6/8/04

PY 03 Deployment Temporary Counting House GPS Clock (Hot) Serial Port cable DOM Hub, PY 03 Deployment Temporary Counting House GPS Clock (Hot) Serial Port cable DOM Hub, String 0 DOM Hub, String 1 BOM: GPS Clock 4 identical BNC to LEMO cables (10 MHz) 4 identical BNC to LEMO cables (1 PPS) 1 Serial daisy-chain cable (Time String) DOM Hub, String 2 10 MHz Antenna Heater DOM Hub, String 3 1 PPS June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 13 GTPrzybylski LBNL 6/8/04

Master Clock Features [Post PY 03] • Multiple GPS clock inputs (? ) - Master Clock Features [Post PY 03] • Multiple GPS clock inputs (? ) - Fail-over (? ); Voting (? ) • Status display (? ) - Local Time display - Fault indicator - Fault Reporting - Selected Clock • Clock Relay Port feeding back to MAPO (? ) - Supply AMANDA with the Ice. Cube Ref Clock • CPU Monitoring Functions via POE, or CAN (? ) - Voltages, Temperatures, Fans - CPU Reset; Power on/off June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 14 GTPrzybylski LBNL 6/8/04

Summary • DSB to DOR card Functionality Demonstrated • GPS clock Drive to DSB Summary • DSB to DOR card Functionality Demonstrated • GPS clock Drive to DSB demonstrated • Firmware under development (Sulanke) possible involvement by LBNL too… • DSB usable, as is, at the Pole for first deployment • Oven Crystal GPS Clock in hand (Exac. Time ET 6000) • Simplified Deployment Plan Exists for this year. June 8, 2004 Ice. Cube DOMHub Hardware Review and Workshop 15 GTPrzybylski LBNL 6/8/04