Clock Distribution for Ice Cube June 8 2004

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 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 DOMHub 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, 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, 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 < 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 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 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 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 PCI Bus-Ctrl 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 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 - 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 Hardware Review and Workshop 10 GTPrzybylski LBNL 6/8/04

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? ) - 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, 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 (? ) - 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 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