AR76 GPS-Disciplined Rubidium/OCXO Clock AR76 Features • Frequency Accuracy : 1E-12 • 1PPS Accuracy: 20ns RMS • Holdover: 1μs/24 hours, 5E-11/month • 20 outputs (10MHz, 1PPS, TOD) • LAN IPV4 (NTP V3, Monitor & Control, DHCP) • External 1PPS / Frequency input for disciplining • 12 channel C(A) code GPS receiver • Front Panel Display (Time, Date, BIT and more) • Monitor & control: RS232, UDP • Supply Voltage: 90/260 VAC • Delay Correc on for Input & Output OpƟons: • Up to 3 channels LAN interface • SNMP Monitor & Control (Custom MIB) • IEEE 1588 / PTP Grandmaster • DDS - Up to 30MHz, 32 bit resolu on • Supply Voltage: DC or DC&AC • Graphic User Interface (GUI) So ware for PC • TOD Format: IRIG-B,NMEA,IRIG-A, NASA-36 • P(Y) code SAASM GPS receiver Application • Test Equipment • Scien fic Equipment • Telecommunica on • Secure Communica on • Cellular Base Sta ons • Mobile Radio Base Sta ons Description The AR76 is a mul -func on GPS Disciplined Rubidium Atomic Clock, which provides accurate me & frequency. The AR76 incorporates numerous features into a single box, including a Rubidium Frequency Standard, an internal C/A code 12 channels GPS receiver, and an input from external 1PPS / frequency. The various op ons of the unit include a variety of different frequencies and several Time Codes outputs. The Rubidium Standard func ons as a local oscillator and is phase-locked to the GPS or to external inputs. All outputs are derived from the Rubidium Clock, which maintains accurate me and frequency when GPS or other inputs are interrupted. For low cost applica ons an Oven Control Crystal Oscillator (OCXO) is offered instead of Rubidium Frequency Standard. The unit includes up to three physical LAN interfaces boards, which support UDP / SNMP for management and for NTP (Network Time Protocol). The three LAN boards can be used for three different networks (with three different IP network addresses), or for two networks where the 3rd LAN board is reserved as a redundant back-up. A Precision-Time Protocol (PTP) is available with one of the LAN board. The AR76A provides mul ple outputs: 10 coax outputs, two fixed (10MHz and 1PPS) and 8 configurable outputs which can be selected from 1PPS, 10MHz, and more. Addi onal outputs are available on the D-Type connector including differen al RS422 outputs, TOD (Time Of Day) outputs with several standard protocol like NMEA, IRIG B etc’ and more. The unit is 19” x 1U rack-mountable encasement. Note: Have-Quick Time Code and an op on for P(Y) SAASM GPS receiver are available in model AR77A. Contact factory for details. Page 1 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons All specs are @ 25°C, quiescent condi ons and sea level ambient unless otherwise specified Basic ConfiguraƟon BNC Connectors OpƟons (*) * 5 x Sine Wave (10±2 dBm) * 5 x 1PPS (TTL/50Ω) The user can set other outputs configura ons (see S/W ICD) Other combina ons of the following signals are available upon request: Frequency: 1MHz, 5MHz, 2.048MHz (sine or square) and others DDS frequency: 1KHz – 30MHz TOD: IRIG B (addi onal formats are also available) , Have Quick, NMEA Other combina ons of the following signals are available upon request : Frequency: 1MHz, 5MHz, 2.048MHz (sine or square) and more other frequencies DDS frequency: 1KHz – 30MHz TOD: NMEA * 4 x 1PPS (RS-422) * 2 x 10MHz (RS-422) * 4 x 1PPS (ICD-GPS-060) * 5 x TOD ICD-GPS-060 -Have Quick * H/W BIT (open collector) Outputs 44 pins D Type Connector For Time and Frequency Disciplining: BNC Connector Inputs Frequency: 1MHz, 2.048MHz, 5MHz and more TOD: IRIG B (more formats are available as well) • 1PPS (TTL/50Ω or ICD-GPS-060) • 10MHz 44 pin D Type Connector TOD: NMEA LAN • IPV4 • NTP server V3 per RFC1305 ≤ 1ms, each LAN board can support up to 1100 NTP requests per second • DHCP • Control & Monitoring (UDP) CLI RS-232 port (single ended or RS-422 ) remote control • IEEE 1588 / PTP – Grandmaster / slave (one output) • Up to 3 independent LAN ports (3 NTP servers or 2 NTP servers and one PTP) Each one has a different IP address serving three separates networks • SNMP V3 (Custom MIB) (*) Contact factory for detail GPS Ant. 10MHz 1PPS External 1PPS/frequency Configurable Outputs x8 TOD AR76 Differen al 1PPS 1PPS PTTI TOD PTTI Power Supply RS-422 NMEA LAN ports (1...3) RS-232 Electrical Interface Page 2 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons Performance (with Rubidium Frequency Standard as the local oscillator) Mode of work Time (1PPS) Long Term Stability Short Term Stability (ADEV) Disciplined to GPS or to external 1PPS Free running Rubidium 20ns RMS rela ve input 1 μs/ 24 hours (typical) A er 24 hours of disciplining ≤ 1E-12 ≤ 5E-11 / month Standard 3E-11 @ 1s 5E-12 @ 100s Improved (opƟon) Contact factory for informa on Temperature Stability Frequency Phase Noise (*) (@ 10MHz) ±3E-10 over -20°C to +65°C Standard (typical) Improved (opƟon) ≤-80dBc/Hz @ 1Hz ≤-114dBc/Hz @ 10Hz ≤-140dBc/Hz @ 100Hz ≤-146dBc/Hz @ 1KHz ≤-147dBc/Hz @ 10KHz Contact factory for informa on Harmonics (*) (10MHz) Spurious (*) (10MHz) ≤-48 dBc ≤-100dBc @±100KHz Rubidium Lock < 4 minutes 5E-11 within < 60 minutes 1E-11 within < 4 hrs 1E-12 within < 24 hrs Warm-up Time (*) The above figures are given for the J17 output. Some degrada on may occur for other outputs. GPS C(A) Code Receiver GPS Tracking L1 frequency 1575 MHz C/A code (SPS), 12 parallel tracking channels Ephemeris & Almanac Available on 44 pin D Type connector (option) PosiƟon Accuracy La tude, Longitude: < 6m (CEP 50%), Al tude: < 11m (CEP 50%) AcquisiƟon Time (Typical) (*) Warm start ≤ 45 second, Cold start ≤ 50 second (worst case) GPS Antenna DC Voltage 5VDC (up to 100 mA) (*) The acquisi on me refers to the GPS receiver output. For frequency stabiliza on during Warm-up – see above. Environmental OperaƟng Temperature -20°C to +65 °C Storage Temperature -20°C to +70°C Humidity Up to 95% at 35°C, non-condensing VibraƟon (transportaƟon) 2.5g RMS Safety Safety Standard CE (safety) Power Supply Power Supply 90-260 VAC 47/63 Hz (Op on: DC power supply 28VDC± 4V, -48VDC) Power ConsumpƟon < 35W Warm-up , < 20W Steady state Power Supply Redundancy (opƟon) Op ons for power supply redundancy: 1. Two power supply inputs – one for AC and the other for DC 2. Two DC power supply inputs Page 3 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons (con nued) Reliability, Maintainability, Testability Display LED IndicaƟons Graphic User Interface (GUI) - opƟon (The GUI is so ware for PC used for maintenance and as a starter kit) The LCD front panel display and bu ons enable the user to view and configure most parameters. The displayed informa on includes the Time, Date, BIT, GPS parameters (antenna current, satellite status) and more. Configured parameters include me synchroniza ons source, 1PPS delay, outputs configura on and more. For details see user manual or contact factory. Florescent display is available as an op on (instead of the LCD display). 4 LEDs on the front panel: Power, Overall BIT, TOD Source, 1PPS / FREQ Source • • • • • • Time / date display Satellites in view Naviga on data from GPS and BIT (Built In Test) Time source & Time zone Leap seconds (from UTC to GPS) • • • • • • IP address configura on Antenna cable delay External input and 1PPS output delay Matrix configura on Time se ng GPS / UTC Addi onal parameters Principles of Opera on The following block diagram describes the opera on of the AR76. The unit includes Rubidium Clock and accepts inputs from either internal GPS receiver or external 1PPS & TOD sources. All outputs are derived from the internal Rubidium Clock, which is phase-locked via a digital PLL to the internal GPS receiver or to one of the external inputs. This way, the Rubidium Clock follows the GPS long term accuracy and cleans the ji er and the noise on the short and medium terms. When the GPS recep on is lost, for short or long periods of me, the Rubidium con nues to maintain accurate me and frequency. Page 4 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons (con nued) Precision Time Protocol - PTP (opƟon) • • • • • IEEE-1588-2008 V2 PTP Grandmaster/Slave Mul cast / Unicast modes of opera on UDP/IPv4 (L2 or L3) Design to handle up to 200 slaves simultaneously Accuracy: ≤1μs (network dependency) In the following figure, two AR76A units are interconnected via a network (one as a master and one as a slave). The me interval between the two 1PPS outputs was measured over me and the results are shown in the plot below. PTP Performance Measurement Setup Time Accuracy < 50ns RMS Page 5 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons (con nued) Performance (with OCXO as local oscillator instead of Rubidium) Mode of work Time (1PPS) Accuracy Disciplined to GPS or to external 1PPS Free running Rubidium 100ns RMS rela ve input @ 25°C 1 ms/ 24 hours (typical) A er 24 hours of disciplining. ≤ 1E-11 Short Term Stability (ADEV) Temperature Stability Frequency ≤ 2E-8 / month (a er 30 days of opera on) 3E-11 @ 1s ±200 ppb over -20°C to +70°C Phase Noise (*) (@ 10MHz) Harmonics (*) (10MHz) Spurious (*) (10MHz) Warm-up Time Standard (typical) Improved (opƟon) ≤-85dBc/Hz @ 1Hz ≤-115dBc/Hz @ 10Hz ≤-130dBc/Hz @ 100Hz ≤-135dBc/Hz @ 1KHz ≤-132dBc/Hz @ 1KHz ≤-153dBc/Hz @ 10KHz ≤-82dBc/Hz @ 1Hz ≤-116dBc/Hz @ 10Hz ≤-140dBc/Hz @ 100Hz ≤-147dBc/Hz @ 1KHz ≤-149dBc/Hz @ 1KHz ≤-149dBc/Hz @ 10KHz ≤-48 dBc ≤-100dBc @±100KHz 1E-11 within < 24 hrs (*) The above figures are given for the J17 output. Some degrada on may occur for other outputs. Graphic User Interface (GUI) So ware for PC (Op on) Time Report Screen BIT Report Screen Page 6 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons (con nued) Electrical ICD Connector Descrip on Standard Type Op ons J1 Power supply AC, Standard Inlet (IEC320) 28VDC / -48VDC J2 GPS antenna TNC, Female J3 – J5 LAN RJ-45 J6 CLI D9, Female J7 Addi onal I/O D type, 44 pin, Female J8 – J17 Coax outputs BNC, Female TNC, Female J18 - J19 Inputs BNC, Female TNC, Female J6 - RS-232 Communica on to PC - 9 pin D type Connector Signals Pin Number Func on 2 CLI-Tx (to PC) 3 CLI-Rx (from PC) 5 GND 1, 4, 6, 7, 8, 9 Not used RS-232, 19,200 baud rate, 1,8,1 no parity (default) J7 - Auxiliary Time, Frequency, communicaƟon and miscellaneous - 44 pin D type connector signals: With this connector the customer can get addi onal outputs such as: 1PPS, 10PPS (and more, TTL or RS-422), addi onal square-wave frequencies (TTL or RS-422), TOD (Time of Day) in NMEA or IRIG B (DC) or other formats, CLI communica on in RS-422 and Overall BIT indica on. Please note that in the table below, outputs of pins 6 – 13, 16 – 19, 26 – 30 and 32 – 35 are offered as op on. J7 – Auxiliary Time, Frequency, Communica on and Miscellaneous - 44 pin D type Connector Signals Pin # Func on Pin # Func on 1 CLI_IN RS422+ 23 GND 2 CLI _IN RS422- 24 FACTORY USE (Lock signal) 3 CLI _OUT RS422+ 25 GND 4 CLI _OUT RS422- 26 TOD #1 (TTL / 100kohm) 5 GND 27 TOD #2 (TTL / 100kohm) 6 X_PPS_RS422+ output (#1) 28 TOD #3 (TTL / 100kohm) 7 X_PPS _RS422- output (#1) 29 TOD #4 (TTL / 100kohm) 8 Y_PPS _RS422+ output (#2) 30 TOD #5 (TTL / 100kohm) 9 Y_PPS _RS422- output (#2) 31 GND 10 Z_PPS _RS422+ output (#3) 32 1PPS #1 (TTL / 50ohm) output 11 Z_PPS _RS422- output (#3) 33 1PPS #2 (TTL / 50ohm) output 12 W_PPS _RS422+ output (#4) 34 1PPS #3 (TTL / 50ohm) output 13 W_PPS _RS422- output (#4) 35 1PPS #4 (TTL / 50ohm) output 14 GND 36 Over all BIT (open collector), < 100mA Low = OK, High impedance = fail 15 5.5V (internal 300Ω series resistor) 37 GND 16 AUX Frequency RS422 OUT+ (#1) Default: 10MHz 38 17 AUX Frequency RS422 OUT - (#1) Default: 10MHz 39 18 AUX Frequency RS422 OUT + (#2) Default: 10MHz 40 19 AUX Frequency RS422 OUT - (#2) Default: 10MHz 41 20 GND 42 21 NMEA_RxD_RS-232 43 22 NMEA_TxD_RS-232 44 FACTORY USE Page 7 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Performance SpecificaƟons (con nued) Mechanical ICD Page 8 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 How To Order AR76 - X X X - X X X X X X Family AR76 Oscillator Type R: Rubidium (standard) X: OCXO Power Supply A: AC (standard) B: +28VDC C: (-48)VDC D: (-48)VDC x 2 LAN Interfaces 0: No LAN 1: 1 x LAN interface (NTP, UDP) (standard) 2: 2 x LAN interface (NTP, UDP) 3: 3 x LAN interface (NTP, UDP) Coaxial Outputs ConfiguraƟons (J8-J17) A: 10MHz sine, 1PPS(*) B: 1 x 10MHz sine +1 x 1PPS + 8 x 2.048MHz C: 3 x 10MHz sine +1 x 1PPS + Events inputs (A, A’ and B) D: 10MHz, 1PPS, 10PPS, IRIG B E: 10MHz, 1PPS, IRIG B (AM) F: 10MHz, 1PPS, IRIG B (AM) x 4, IRIG B (DC) x 4 S: Customized special configura on & frequency (the final part number will be defined before PO) (*)The user can configure the outputs by using a CLI command. Contact factory. (**)Special frequencies like 120MHz are also available per request. Contact factory. OpƟons 0: No other op ons (standard) 1: LAN UDP (ASCII format, similiar to AR73A-16 2: Reserved 3: 10PPS Outputs 4: Rubidium improved phase noise 5: OCXO improved phase noise A: TNC connectors (no other op ons) PTP 0: No PTP (standard) P: PTP Grand master AUX Time Codes 0: No AUX me protocol (standard) N: NMEA A: Almanac & Ephemeris Time Codes 0: No me code (standard) H: Have Quick (GPS ICD GPS 060) I: IRIG B (AM) A: Have Quick and IRIG B (AM) B: IRIG B (AM & DC) AUX Outputs ConfiguraƟons (44 pins D Type Connector) 0: No AUX outputs on this connector (standard) A: 4 x 1PPS (pins # 32-35) B: AUX with fast UART for TIC measurement C: 4 x 1PPS RS422 outputs D: 4 x 1PPS RS422 + 4 x 1PPS PTTI outputs E: 4 x 1PPM outputs Note: P(Y) SAASM GPS receiver are available in model AR77A. Contact factory for details. Page 9 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014 Revision History Revision Change Summary 1.0 Product Release Date October 2014 For Additional Information, Please Contact USA: Europe: Asia: Vectron Interna onal 267 Lowell Road, Suite 102 Hudson, NH 03051 Tel: 1.888.328.7661 Fax: 1.888.329.8328 Vectron Interna onal Landstrasse, D-74924 Neckarbischofsheim, Germany Tel: +49 (0) 7268.801.100 Fax: +49 (0) 7268.801.282 68 Yin Cheng Road(C), 22nd Floor One Lu Jia Zui Pudong, Shanghai 200120, China Tel: +86 21 6194 6886 Fax: +86 21 6194 6699 Disclaimer Vectron Interna onal reserves the right to make changes to the product(s) and or informa on contained herein without no ce. No liability is assumed as a result of their use or applicaon. No rights under any patent accompany the sale of any such product(s) or informa on. Page 10 of 10 Vectron Interna onal • 267 Lowell Road, Suite 102, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • h p://www.vectron.com Rev 1.0 Oct 2014