AR76 Product Data Sheet

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