Next Generation Clock Synchronization Module From Raltron

COMPANY
COMPANY News
News
Product News from Raltron Electronics Corporation
NEXT GENERATION CLOCK SYNCHRONIZATION MODULE FROM RALTRON INCORPORATES GPS
For immediate release Miami, Florida - October 7, 2003:
Raltron Electronics has just announced details of an enhanced
version of its well-accepted family of Synchronization modules,
which now incorporates a GPS receiver. This new product from
Raltron is targeted at the wireless infrastructure market and
network equipment manufacturers of CDMA 2000, W-CDMA,
GSM. GPRS, EDGE, UMTS, and other wireless base station equipment.
The new SY-SGC1 clock module combines a precision oven controlled crystal oscillator; a 12-channel parallel tracking GPS engine, associated control circuitry, and all on one reliably designed board.
The oven controlled crystal oscillator provides an accurate and low phase noise reference signal at
10 MHz. A proprietary algorithm steers and disciplines the oven-controlled oscillator and locks it to
the GPS signal. This provides an accuracy of 7 microseconds within 24 hours, thus offering a more
cost effective and smaller replacement for the Rubidium oscillator used in base station applications.
The unit operates in three different modes; GPS locked, Holdover mode and External Lock. The
GPS Receiver obtains the signal from an externally mounted antenna. There are five synchronized
outputs, 10MHz sinusoidal, 10MHz square wave, 1PPS, and additional user defined outputs. Other
input sources can be a Cesium Standard, local oscillator, T1/E1 line, or any external signal up to 80
MHz. Operating voltage is at 48VDC with a power consumption of 12W and an operating temperature range of –20 to + 70°C.
Customization is available in both operation performance and mechanical size. The SY-SGC1 advanced level of integration makes the module the perfect solution for precise time and frequency
management applications in the wireless industry.
Raltron’s new SY-GSCI Module pricing and delivery is based on customer specifications.
For detailed specifications, price and delivery quotations; contact Raltron at their corporate
Miami headquarters:
Raltron Electronics Corporation
10651 NW 19th Street, Miami, FL 33172
Tel. (305) 593-6033 Fax: (305) 594-3973
Web: www.raltron.com E-Mail: [email protected]
Europe
Israel
Korea Founded in 1983, Raltron Electronics, Corp. is a world leader in the design and manufacture of
Japan
China
frequency management products including a large variety of timing crystals, crystal oscillators,
VCO’s, VCXOs, TCXOs, OCXOs, filters, ceramic resonators and other high precision frequency
control products. It is a privately held ISO-9001 certified company with facilities in Miami, Japan,
Korea, China, Singapore, Taiwan, Israel and Europe and its products are marketed through a
worldwide network of independently owned representatives and distributors.
Press Contact:
Taiwan Tod Raphaely
(305) 593-6033
Singapore
Raltron Electronics Corporation 10651 NW 19th St. Miami, Florida 33172 U.S.A.
Tel: 305-593-6033 Fax: 305-594-3973 e-mail: [email protected] Internet: http://www.raltron.com
SYNCHRONOUS EQUIPMENT
OEM GPS Time and Frequency Reference – SY-GSC1
SY-GSC1
Date: September 2003
PRELIMINARY
•
INTRODUCTION
The SY-GSC1 is an accurate time and frequency source that has been designed as a subsystem level module.
The module is designed to work within wireless base station systems where synchronization is vital. The SY-GSC1
integrates a GPS receiver with a disciplined ovenized oscillator and control circuitry on single board to provide
precision time and frequency synchronization required by high-speed digital networks and systems.
•
FEATURES
√
An time and frequency synchronization solution for wireless base station timing.
√
GPS receiver with twelve-channel parallel tracking.
√
Ovenized Crystal Oscillator provides stable 10MHz output in holdover.
√
Enhanced holdover accuracy provided by clock disciplining algorithm.
√
Three outputs generate frequencies up to 80MHz.
√
External synchronization input - T1/E1 uses as secondary reference.
√
Alarm, status signals and messages.
√
Host communication interfaces for configuring and remote monitoring UART, SPI and parallel.
√
Redundant operation provided by two units.
√
Compact dimensions.
√
Low cost solution for timing.
•
APPLICATION
The SY-GSC1 is a low cost timing source that can be easily integrated into system equipment to meet the needs of
a variety of applications. Included are wireless infrastructure systems, such as, CDMA2000, WCDMA, GSM and
E911 location systems. The module also can be used in other systems or equipment for ATM, SDH, PDH, and
SONET networks. Wherever a timing unit with high performance specifications is required, the SY-GSC1 can be
embedded within the network system and provide all necessary frequencies and interfaces. The SY-GSC1 can
also be used as timing reference in laboratories and manufacturing facilities.
th
RALTRON ELECTRONICS CORP. ƒ 10651 N.W.19 St ƒ Florida 33172 ƒ U.S.A.
Tel: 305 593-6033 ƒ Fax: 305-594-3973 ƒ e-mail: [email protected] ƒ Internet: http://www.raltron.com
SYNCHRONOUS EQUIPMENT
OEM GPS Time and Frequency Reference – SY-GSC1
DC/DC
Converter
Power Mgm.
ANTENNA
GPS
RECEIVER
POWER
OCXO
OUT 1
T1/E1
LIU
1pps Input
DSP,
FPGA,
RAM,
FLASH,
DDS
1 PPS
Generator
Out PLL
Synthesizers
Voltage and
Temperature
Measurement
OUT 2
OUT 3
OUT 4
OUT 5
COMM
PORTS
UART, SPI and Parallel
Figure 1. - The functional block diagram of SY-SGC1.
•
DESCRIPTION
The architecture of SY-GSC1 is shown on the Figure 1. The module operates in three different modes GPS
Locked, Holdover mode and Lock to an external reference. A control algorithm provides the switching between the
modes. The GPS Locked mode is when the module is locked to signal coming from GPS. This is when GPS
receiver has acquired enough satellites to provide a valid timing signal. The Holdover mode is when there is no
valid timing signal at the receiver output and the OCXO frequency is compensated by software in regard of
temperatures, aging and power supply variations. The unit can also be locked to an external reference if available.
The GPS receiver gets signal from externally mounted antenna. The active micro strip patch antenna molded in
plastic, and powered by receiver, is specially designed for timing application. The receiver is controlled and
monitored by microprocessor so at any given time the integrity of GPS signal can be evaluated. The signal from the
receiver is processed by clock algorithm implemented in DSP and used to control the OCXO (Ovenized Crystal
Oscillator) during the GPS Locked mode. During that time a clock model implemented in software is continuously
updated. When the GPS signal lost its integrity the local oscillator continue to be disciplined by the clock model
data.
The module provides five synchronized outputs sinusoidal 10MHz, square 10MHz, 1 PPS and additional custom
defined outputs. The communication ports supports standard interfaces such as RS232, SPI or parallel to be easily
control from host computer or other terminal equipment. The isolated DC/DC converter provides wide range of
input voltages. The additional input signal is used during calibration and testing of the module but also can be used
as additional synchronized signal where is available.
Raltron is able to customize SY-GSC1 to customer requirements.
th
RALTRON ELECTRONICS CORP. ƒ 10651 N.W.19 St ƒ Florida 33172 ƒ U.S.A.
Tel: 305 593-6033 ƒ Fax: 305-594-3973 ƒ e-mail: [email protected] ƒ Internet: http://www.raltron.com
SYNCHRONOUS EQUIPMENT
OEM GPS Time and Frequency Reference – SY-GSC1
•
SPECIFICATIONS
General Specifications
Inputs
Output Signals
GPS Receiver
Mechanical
Power Supply
Power
Operating Temperature
Humidity
Internal Oscillators
GPS antenna
External signal
Number of Outputs
Output 1
Output 2
Output 3
Output 4
Output 5
Receiver Architecture
Acquisition Time
Communication Ports
Frequency Output
Performance
< 20 s typical TTFF-hot (1)
< 50 s typical TTFF-warm (2)
< 450 s typical TTFF-cold
< 1.0 s internal reacquisition (typical)
Antenna to Receiver
Interconnection
Single coaxial cable
Antenna sense circuit
Antenna
Active micro strip patch antenna module
Tracking Capability
Serial Interface UART
Protocol
Parallel
Protocol
Serial Peripheral Interface SPI
Protocol
12 simultaneous satellites
RS232
Raltron Interface Protocol, binary @ 9600, 8-N-1
8 or 16 bit parallel
DARAM/MMR
8 or 16 bit fast serial
MMR
-11
For one day average
Frequency accuracy
≤1x10
Time accuracy
±50ns relative to UTC
-11
Root Allan Variance ≤5x10 , 100s averaging
time
≤-90dBc @ 10Hz
≤-120dBc @ 100Hz
≤-130dBc @ 1kHz
≤-145dBc @ 10kHz
≤-145dBc @ 100kHz
≤-30dBc
≤-70dBc
Time Domain stability
Phase Noise @ 10MHz
Harmonics @ 10MHz
Spurious @ 10MHz
Oscillator Temperature
Performance
•
160mm(D) x 100mm(W) x 35mm(H)
-48VDC ±20%
12W
-20°C to 70°C
5% to 95% non-condensing
High stability SC-cut OCXO
L1 GPS 1575.42MHz C/A
T1/E1 and 10MHz or 1pps
5
10MHz, Sinus @ 50ohm, 13dBm ± 2dBm
1pps LVTTL
10MHz LVTTL, LVDS, LVPECL
0.5pps to 80MHz LVTTL, LVDS, LVPECL
0.5pps to 80MHz LVTTL, LVDS, LVPECL
12 parallel channels
L1 1575.42 MHz,
C/A code (1.023 MHz chip rate)
Code plus carrier tracking (carrier aided tracking)
-9
≤8x10 typical
-10
Oscillator Aging
≤7x10
per day average frequency change
Holdover
<8µs over 8h max. Temperature change of
±15°C after 24h locked to GPS
OEM board
Other available on request
Depending of the OCXO
Other available on request
Depending of required stability
Optional synch input
User defines
User defines
(1)-with current almanac,
position, time and ephemeris
(2)-with current almanac,
position and time
Powered by receiver module
(5-80 mA @ 5 Vdc)
User define
Other available on request
Contact Raltron
Contact Raltron
Locked to GPS
Locked to GPS
Locked to GPS
Not locked to GPS, no
disciplining software
Not locked to GPS, no
disciplining software
For tighter spec. Contact
Raltron
ORDERING INFORMATION
For part number please contact Raltron Electronics Corp.
th
RALTRON ELECTRONICS CORP. ƒ 10651 N.W.19 St ƒ Florida 33172 ƒ U.S.A.
Tel: 305 593-6033 ƒ Fax: 305-594-3973 ƒ e-mail: [email protected] ƒ Internet: http://www.raltron.com