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Albalá Ingenieros GPS3000C03 Manual

Ultrastable gps based frequency standard with 10 mhz, 1 pps and g.703 t12 2048 khz synchronization signal outputs
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GPS3000C03
ULTRASTABLE GPS BASED FREQUENCY STANDARD WITH 10 MHz, 1 PPS
AND G.703 T12 2048 kHz SYNCHRONIZATION SIGNAL OUTPUTS
Version 1.0
Albalá Ingenieros, S.A.
04 May 2016 - © Albalá Ingenieros S.A. - All rights reserved
Medea, 4 - 28037 Madrid - Spain

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  • Page 1 GPS3000C03 ULTRASTABLE GPS BASED FREQUENCY STANDARD WITH 10 MHz, 1 PPS AND G.703 T12 2048 kHz SYNCHRONIZATION SIGNAL OUTPUTS Version 1.0 Albalá Ingenieros, S.A. 04 May 2016 - © Albalá Ingenieros S.A. - All rights reserved Medea, 4 - 28037 Madrid - Spain...
  • Page 2 GPS3000C03...

  • Page 3: Table Of Contents

    3.6.3. Microswitch bank S2 ......................16 3.6.4. Configuration of the 1/5/10 MHz output ..............17 3.6.5. GPS3000C03: 2048 kHz outputs - configuration of the 2048/N kHz output 17 3.7. Installing the module in the mounting frame ..............17 3.8. Interconnection ..........................18 3.8.1.
  • Page 4 4.2. Configuration from the front panel ..................29 4.3. Operating modes ......................... 30 4.4. Functional description ....................... 31 4.5. Module remote control and supervision ................33 4.5.1. Details of the GPS3000C03 registers ................34 5. GLOSSARY ........................43 6. REGULATIONS ........................45 7. VERSIONS ......................... 47...

  • Page 5: Description

    If the characteristics of the high stability OCXO weren't sufficient in Holdover Mode and the user wished to improve them, the GPS3000C03 has an input for an external 10 MHz signal generator. This input can be used for higher quality 10 MHz references, for example a rubidium-based oscillator.
  • Page 6 SNMP management and the ability to record events in a file including date and time information for further analysis. The GPS3000C03 is a TL3000 terminal line module and can be housed in a three rack unit (3 RU) UR3000 mounting frame or a 1 RU UR3100 mounting frame.

  • Page 7: Gps-Based Synchronization

    GPS receiver must be known. Sometimes this information is already known and the equipment can use it as soon as it is turned on. Or the receiver can be asked to calculate its coordinates and then continue to use them later on. The GPS3000C03 module is...

  • Page 8: Oscillator Drift Learning Curve

    Holdover Mode the drift compensation of the oscillator is as precise as possible. The GPS3000C03 measures the offset of its internal oscillator, compares this to its estimation model once per second, and uses the difference between the two to refine the model.

  • Page 9: Features

    Albalá Ingenieros | Manual GPS3000C03 In order to respond to the previously mentioned requirements, the GPS3000C03 performs a daily comparison between the phase delay that would be obtained in the case of the module entering Holdover Mode and freezing the actual output frequency and the phase delay that would be obtained by using the adaptive model as it is at the time of the comparison.

  • Page 10: Block Diagram

    Albalá Ingenieros | Manual GPS3000C03 1.5. Block diagram...

  • Page 11: Specifications

    Albalá Ingenieros | Manual GPS3000C03 2. SPECIFICATIONS Time and frequency stability specifications Measurement conditions After one day of continuous operation in indicated state Time from cold start to GPS locked output with better than 10 accuracy <10 minutes 10 MHz output Allan deviation. GPS locked, typical values:...
  • Page 12 Albalá Ingenieros | Manual GPS3000C03 Return loss >12 dB at 10 MHz Number of outputs Output level >7 dBm Harmonic level: second harmonic <- 40 dBc third and higher harmonics <- 40 dBc Spurious level <- 80 dBc Phase noise: @ 10 Hz <- 93 dBc/Hz...

  • Page 13: Installation

    ELECTROSTATIC DISCHARGE. Always use antistatic bags clearly identified with a high degree of shielding for storage and transportation. The GPS3000C03 module is composed of two parts: one GPS3000P03 main board and one GPS3000P04 rear board. Both parts must be installed in a UR3000 or UR3100 mounting frame following the instructions in the corresponding section of this chapter.

  • Page 14: Safety Information Regarding Lithium Batteries

    3.3. Safety information regarding lithium batteries The GPS3000C03 module contains a lithium battery to keep the internal clock running while the equipment remains off. • Danger of explosion exists if the battery is replaced incorrectly. The battery contains lithium and can explode if misused, handled or installed incorrectly.

  • Page 15: Environmental Considerations

    Higher air flow means more thermal losses and therefore high input power. Installation of more than six GPS3000C03 modules into a UR3000 with only one power supply is not recommended. If redundant power supplies are installed than all ten slots of the mounting frame can be outfited with GPS3000C03 modules.

  • Page 16: Jumpers J3 And J4: Software Protection For The Module

    PROGRAM JUMPERS FOR THE GPS3000C03 If the antenna will not be supplied with power remotely then jumper J1 should be removed. In this case, the GPS3000C03 module should see a very high impedance to the DC current. 3.6.2. Jumpers J3 and J4: Software protection for the module Jumpers J3 and J4 are used to protect the software program stored in the module's flash memory.

  • Page 17: Configuration Of The 1/5/10 Mhz Output

    This output comes from the factory set to 2048 kHz. 3.7. Installing the module in the mounting frame The steps needed to install the GPS3000C03 module with the rear board in the mounting frame are: 1 - Disconnect all power cords from the power supplies of the mounting frame.
  • Page 18 7 - Insert the GPS3000P03 board (the main board of the GPS3000C03 module) in through the front of the mounting frame so that the edges of the board slide along the guide rails of the mounting frame.

  • Page 19: Interconnection

    The external reference inputs EXT_1PPS and EXT_10MHz, if used, should also use cabling with a 50 Ω characteristic impedance. The GPS3000C03 provides outputs with a 75 Ω characteristic impedance. 2048 kHz OUT1, 2, 3 and 2048k/N_TTL should all use RG59 or a similar cabling type.

  • Page 20: Electrical Sdi Video Connections

    FAULT indicates the lack of a 1 PPS signal and HLDV indicates that the GPS3000C03 is in Holdover Mode. The voltage and current limits for the relays used to close these contacts are listed in the Specifications section of this manual and must be observed.

  • Page 21: Analog Video Connections

    Albalá Ingenieros | Manual GPS3000C03 same type of cabling should be used for both parts. The use of analog video coaxial cables RG-59 type or similar is not recommended for digital video except for very short distances. 3.8.2. Analog video connections The analog video outputs use BNC connectors and have an impedance of 75 Ω.

  • Page 22: Antenna Installation

    GPS3000C03 3.9. Antenna installation The GPS3000C03 requires an antenna in order to receive signals from GPS satellites. This antenna is normally installed outdoors and should be placed so that it has an unobstructed view of the sky. Low-loss, 50 Ω coaxial cabling should be used to connect the antenna to the GPS3000C03.

  • Page 23: Calculation Of Maximum Cable Length

    The signals transmitted by the array of the GPS satellites are captures by the antenna, filtered and amplified before being fed into the GPS3000C03 module. Given that the signal level received is often below the system's noise floor, it is not possible to measure the signal's level.

  • Page 24: Maximum Cable Run Calculation With The Ampgps1

    Ingenieros should be employed. This amplifier provides a minimum gain of 15 dB. The maximum cable lengths between the AMPGPS1 amplifier and the GPS3000C03 receiver are given in the following table. Cable type Maximum length (m) RG58 RG223 RG213 9913F7 LMR-400 1/2¨ The AMPGPS1 is optional and is not included with the GPS3000C03.

  • Page 25: Susceptibility To Interference

    3.11. Redundant operation The GPS3000C03 module has been designed to operate both in systems with one sole GPS receiver as well as systems with reinforced reliability (redundant systems). In order to provide redundant functionality, a control line has been included that connects all of the modules that will be operated redundantly.
  • Page 26 Albalá Ingenieros | Manual GPS3000C03 error in its operation it cuts off its own output, unless it is the only active unit in a redundant group. In that case, the outputs of the affected unit remain active using the internal, high precision oscillator in Holdover Mode. In such situations the first device to recover GPS synchronization proceeds to activate its output and to deactivate the output of the last unit that lost synchronization.

  • Page 27: Operation

    Albalá Ingenieros | Manual GPS3000C03 4. OPERATION This section describes the significance of the front panel indicators of the GPS3000C03 module and their remote control and monitoring ability. 4.1. Front panel description The appearance of the front panel and the elements it contains are shown in the following illustration.
  • Page 28 Albalá Ingenieros | Manual GPS3000C03 the module. The lower section is dedicated to manual control when in Holdover Mode. The function of the indicator LEDs is described as follows: In the STATUS box: OUT OFF/ON: Blue. This LED blinks in sync with the 1 PPS output to indicate that the output is active.

  • Page 29: Configuration From The Front Panel

    Albalá Ingenieros | Manual GPS3000C03 FREQ ERR: Green. This LED lights up to indicate that the measurement displayed on the LED bar represents an estimation of the frequency drift that would occur in one day if the module were in Holdover Mode, as per the following table.

  • Page 30: Operating Modes

    Holdover Mode with the pusbutton cannot be deactivated. 4.3. Operating modes The purpose of the GPS3000C03 is to deliver a reference signal based upon a signal received from the array of GPS satellites. This is the normal operating status and is known as Tracking Mode.

  • Page 31: Functional Description

    2.0). 4.4. Functional description The GPS3000C03 uses the GPS system signal to correct its internal OCXO. In order to obtain a GPS signal with sufficient precision a large number of timing signal measurements from various satellites must be averaged. For this reason, once the module has been powered on a maximum of ten minutes are required in order for the module to supply an output signal.
  • Page 32 Albalá Ingenieros | Manual GPS3000C03 validated and switches to fixed-position mode, in which a minimum of two satellites must be tracked. The calculated position is stored in non-volatile memory for future use. The user can check the searching and acquisition status of the GPS receiver at any time via the remote monitoring system.

  • Page 33: Module Remote Control And Supervision

    Albalá Ingenieros | Manual GPS3000C03 4.5. Module remote control and supervision The GPS3000C03 can optionally be remotely controlled/supervised. In order to perform remote configuration and supervision of the module an optional TL3000 family remote communications controller must be installed in the mounting frame.

  • Page 34: Details Of The Gps3000C03 Registers

    Albalá Ingenieros | Manual GPS3000C03 4.5.1. Details of the GPS3000C03 registers The GPS3000C03 module provides control and status registers that can be read and written by means of specific commands described in the communication control module user manuals. The parameter information grouped in the CONTROL or RAM sections is stored in volatile memory.
  • Page 35 Albalá Ingenieros | Manual GPS3000C03 LTC_BGF_FORMAT 0x05 0x60 Allows selecting the format of the LTC binary groups fields 0=None, 1=TVE, 2=BBC UPDATE_TIME_ZONE 0x05 0x80 Allows updating of the time zone information 0=Disabled, 1=Enabled SDI_VID_H_DELAY 0x06 0xFFFF Allows adjusting the SDI video horizontal delay = 37.037*x ns...
  • Page 36 Albalá Ingenieros | Manual GPS3000C03 DRIFT_LEARN_FAIL 0x0C 0x20 Drift learning status 0=Improves OCXO, 1=Does not improve OCXO VERSION 1.X CONTROL Name snmp trap Description CLOCK_SOURCE 0x00 0x01 Allows selecting the reference clock source 0=Internal (OCXO), 1=External 1PPS_SOURCE 0x00 0x02 Allows selecting the 1PPS source...
  • Page 37 Albalá Ingenieros | Manual GPS3000C03 STATUS Name snmp trap Description MEAS_FREQ_FAIL 0x01 0x01 Frequency measure system status 0=OK,1=Fail OVEN_FAIL 0x01 0x02 OCXO oven status 0=OK,1=Fail 1PPS_FAIL 0x01 0x04 1PPS reference input status 0=OK,1=Fail 10MHZ_FAIL 0x01 0x08 10MHz reference input status...
  • Page 38 Albalá Ingenieros | Manual GPS3000C03 GPS_FAIL_MASK 0x04 0x01 Allows masking GPS fail 0=Disabled, 1=Enabled PHS_FAIL_MASK 0x04 0x02 Allows masking phase measurements fail 0=Disabled, 1=Enabled 1PPS_FAIL_MASK 0x04 0x04 Allows masking 1PPS fail 0=Disabled, 1=Enabled INI_FAIL_MASK 0x04 0x08 Allows masking frequency initialization meter fail mask...
  • Page 39 Albalá Ingenieros | Manual GPS3000C03 ANTENA_STAT 0x03 0x18 Antenna connection status 0=OK, 1=Overcurrent, 2=No present SAT_NO_FAIL 0x03 0x20 Indicates that the number of visible satellites is low 0=OK,1=Fail ALMANAC_FAIL 0x03 0x40 Indicates that the modules has an invalid almanac 0=OK,1=Fail...
  • Page 40 Albalá Ingenieros | Manual GPS3000C03 LTC_BGF_FORMAT 0x05 0x60 Allows selecting the format of the LTC binary groups fields 0=None, 1=TVE, 2=BBC UPDATE_TIME_ZONE 0x05 0x80 Allows updating of the time zone information 0=Disabled, 1=Enabled SDI_VID_H_DELAY 0x06 0xFFFF Allows adjusting the SDI video horizontal delay = 37.037*x ns...
  • Page 41 Albalá Ingenieros | Manual GPS3000C03 DRIFT_LEARN_FAIL 0x0C 0x20 Drift learning status 0=Improves OCXO, 1=Does not improve OCXO VERSION 4.X CONTROL Name snmp trap Description CLOCK_SOURCE 0x00 0x01 Allows selecting the reference clock source 0=Internal (OCXO), 1=External 1PPS_SOURCE 0x00 0x02 Allows selecting the 1PPS source...
  • Page 42 Albalá Ingenieros | Manual GPS3000C03 STATUS Name snmp trap Description MEAS_FREQ_FAIL 0x01 0x01 Frequency measure system status 0=OK,1=Fail OVEN_FAIL 0x01 0x02 OCXO oven status 0=OK,1=Fail 1PPS_FAIL 0x01 0x04 1PPS reference input status 0=OK,1=Fail 10MHZ_FAIL 0x01 0x08 10MHz reference input status...

  • Page 43: Glossary

    Albalá Ingenieros | Manual GPS3000C03 5. GLOSSARY 1 PPS One Pulse Per Second. Synchronization signal that consists of one short pulse that is repeated every second. Typically uses TTL levels. CCVS Composite color video signal. Standard definition composite analog video signal. This signal carries synchronization, luminance and chrominance information.
  • Page 44 Albalá Ingenieros | Manual GPS3000C03 GPS3000C03...

  • Page 45: Regulations

    Albalá Ingenieros | Manual GPS3000C03 6. REGULATIONS ITU-T G.703 (2001) Physical/electrical characteristics of hierarchical digital interfaces. SMPTE 12M-1 (2008) Time and Control Code. See also:...
  • Page 46 Albalá Ingenieros | Manual GPS3000C03 GPS3000C03...

  • Page 47: Versions

    Albalá Ingenieros | Manual GPS3000C03 7. VERSIONS Ver. Date Description 13-06-2013 Preliminary Version 04-05-2016 First version...
  • Page 48 Albalá Ingenieros, S.A. Medea, 4 - 28037 Madrid Spain +34 913274453 www.albalaing.com info@albalaing.com...

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