DOM Clock Distribution

DOM Clock Distribution

Clock Distribution for IceCube June 8, 2004 Lawerence Berkeley National Laboratory Gerald Przybylski GTPrzybylski LBNL 10/13/2003 Big Picture ExacTime ET6000 GPS Clock(s) US Naval Observatory (~1E-15 Allan Var. ) UTC Slaved Rubidium Oscillator Inside, -11 < 1x10 Allan Var. Serial 1pps 10 MHz Master Clock Unit Fan

Out Balanced Drivers (With Oven Crystal option) DOM Hub DOM Hub DOM Hub DOM DOMHub Hub Equal Length Twisted Pairs; 10 Mhz, 1pps, RS-232; Cat5E with RJ-45s ~90 DOM Hubs June 8, 2004 IceCube DOMHub Hardware Review and Workshop 2 GTPrzybylski LBNL 6/8/2004

Rubidium Oscillator Allan Variance Figure from http://www.srsys.com/products/PRS10.htm June 8, 2004 IceCube DOMHub Hardware Review and Workshop 3 GTPrzybylski LBNL 10/13/2003 Rubidium Clock Phase Noise Figure from http://www.srsys.com/products/PRS10.htm June 8, 2004 IceCube 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 < 2x10-15. GPS Satellites Synchronized to USNO clock. DOMs more stable than XL GPS clocks

40ns RMS; 150ns Peak Error; 3E-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 FPGA -to- Wire June 8, 2004 IceCube 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 DOR card DOR card DOR card DOR card 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) IceCube DOMHub Hardware Review and Workshop 6 GTPrzybylski LBNL 10/13/2003 The DOR Card Data Buffer SRAM 2 x 256Kx16 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 Fanout (PCI Card) June 8, 2004 Altera FPGA 10 MHz 1 pulse/second

EP20K200E Config (Serial) Time String JTAG JTAG JTAG FLASH PCI Bus Altera PLD EPM7064 1M x 8 20 MHz Aux. Osc. 96 V IceCube DOMHub Hardware Review and Workshop KHS 10-2003 7

GTPrzybylski LBNL 10/13/2003 DOR_Rev1, Block Diagram +/-48 V wired Power-sw. #1..4 DOM 1..4 Power-filter #1..4 OR nPON_1..4 Cable Interface #0 nPON_1..4 DOM 5..8 Cable Interface #2 Communicati ons Controller Cable Interface #3

Master Clock DSB: 1-to-8 Slave Clock Fanout (PCI Card) 20 MHz June 8, 2004 Aux. Osc. PCI Core Loc al Bus Cable Interface #1 PCI BusCtrl Altera Altera EP1C20F400C8 Memory Bus Config PCI Bus

Config JTAGEP1K50FC256-1 Clock_sel JTAG JTAG 1PPS Serial JTAG Data Buffer SRAM 2x 256Kx16 Config. PLD Altera EPM7128BFC100-10 FLASH PLL 2M x 8 Clock IceCube DOMHub Hardware Review and Workshop

QS5LV9 19 loc al Osc . 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 IceCube DOMHub Hardware Review and Workshop 9 GTPrzybylski LBNL 6/8/04

Master Clock to DSB Like 802.3 RS-485 June 8, 2004 IceCube DOMHub Hardware Review and Workshop 10 GTPrzybylski LBNL 6/8/04 DSB to DOR LVDS June 8, 2004 IceCube DOMHub Hardware Review and Workshop 11 GTPrzybylski LBNL 6/8/04 Master Clock Features [PY03, this year] Single ET6000 (Xtal, or Rubidium?) - OCXO: 10 Sec Allan Variance 2E-11, -120 dBc/Hz Phase Noise - Rubidium: 10 Sec Allan Variance 1E-11, -91 dBc/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 (>-40C) June 8, 2004 IceCube DOMHub Hardware Review and Workshop 12 GTPrzybylski LBNL 6/8/04 PY03 Deployment Temporary Counting House GPS Clock (Hot) Serial Port cable DOM Hub, String 0 BOM: GPS Clock 4 identical BNC to LEMO cables (10 MHz) DOM Hub, String 1 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 IceCube DOMHub Hardware Review and Workshop 13 GTPrzybylski LBNL 6/8/04 Master Clock Features [Post PY03] 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 IceCube Ref Clock CPU Monitoring Functions via POE, or CAN (?) - Voltages, Temperatures, Fans

- CPU Reset; Power on/off June 8, 2004 IceCube 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 (ExacTime ET6000) Simplified Deployment Plan Exists for this year. June 8, 2004 IceCube DOMHub Hardware Review and Workshop 15 GTPrzybylski LBNL 6/8/04

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