1. Manuals
  2. Brands
  3. Spectracom Manuals
  4. Clock
  5. 8183A NETCLOCK
  6. Instruction manual

Spectracom 8183A NETCLOCK Instruction Manual

Netclock/gtp gps master clock
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Copyright  2003 Spectracom Corporation.
Contents of this publication may not be reproduced in any form
without the written permission of Spectracom Corporation.
REVISIONS, IF ANY, ARE LOCATED AT THE END OF THE MANUAL
MODEL 8183A NETCLOCK/GTP
GPS MASTER CLOCK
INSTRUCTION MANUAL
SPECTRACOM CORPORATION
95 Methodist Hill Drive
Suite 500
Rochester, NY 14623
PHONE
585-321-5800
FAX
585-321-5219
www.spectracomcorp.com
MANUAL REVISION 1.2
July 2003
All rights reserved.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 8183A NETCLOCK and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Spectracom 8183A NETCLOCK

Summary of Contents for Spectracom 8183A NETCLOCK

  • Page 1 Copyright  2003 Spectracom Corporation. All rights reserved. Contents of this publication may not be reproduced in any form without the written permission of Spectracom Corporation. REVISIONS, IF ANY, ARE LOCATED AT THE END OF THE MANUAL MANUAL REVISION 1.2...
  • Page 2 If in Spectracom's judgment the defective condition in a Spectracom product is for a cause listed above for which Spectracom is not responsible, Spectracom will make the repairs or replacement of components and charge its then current price, which buyer agrees to pay.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 GENERAL INFORMATION 1.0 INTRODUCTION........................1-1 1.1 FEATURES ...........................1-2 1.2 WARRANTY INFORMATION AND PRODUCT SUPPORT ..........1-2 1.3 MANUAL ERRATA AND SPECIAL DOCUMENTATION .............1-3 1.4 UNPACKING.........................1-3 1.5 SPECIFICATIONS ........................1-4 1.5.1 Receiver 1.5.2 Display 1.5.3 Status Indicators 1.5.4 RS-232 Serial Comm 1.5.5 RS-485 Remote Output 1.5.6...
  • Page 4 SECTION 3 OPERATION INTRODUCTION........................3-1 FRONT PANEL FUNCTIONS ....................3-1 3.1.1 Display 3.1.2 GPS Lock Lamp 3.1.3 Time Sync Lamp REAR PANEL FUNCTIONS ....................3-3 3.2.1 GPS Antenna 3.2.2 Standard 10 MHz Output 3.2.3 1PPS Output 3.2.4 FAA IRIG B Outputs 3.2.5 RS-232 Serial Communication Ports 3.2.6...
  • Page 5 SECTION 5 SERVICE INFORMATION INTRODUCTION........................5-1 RECEPTION TROUBLESHOOTING..................5-1 5.1.1 No Reception 5.1.2 Low GPS Quality OSCILLATOR ADJUSTMENT ....................5-4 5.2.1 Adjustment Procedure APPENDIX A FAA IRIG CODE DESCRIPTION INTRODUCTION........................A-1 MODEL 8228 GPS ANTENNA ..................... A-1 A.1.1 FAA IRIG B General Description...
  • Page 6 ILLUSTRATIONS FIGURE 1-1 NETCLOCK/GPS MASTER CLOCK FIGURE 2-1 ANTENNA INSTALLATION FIGURE 2-2 MODEL 8226 IMPULSE SUPPRESSOR FIGURE 2-3 CONNECTOR ASSEMBLY INSTRUCTIONS FIGURE 2-4 GROUNDING PLATE INSTALLATION FIGURE 2-5 MODEL 8227 GPS INLINE AMPLIFIER FIGURE 2-6 CABLE GUIDELINES FIGURE 3-1 NETCLOCK/GPS FRONT PANEL FIGURE 3-2 NETCLOCK/GPS REAR PANEL FIGURE 3-3...
  • Page 7 TABLES TABLE 1-1 MODEL 8183 ANCILLARY KIT TABLE 3-1 IRIG PIN OUT TABLE 3-2 SERIAL COMM PIN ASSIGNMENTS TABLE 3-3 PIN ASSIGNMENTS TABLE 3-4 QUALITY INDICATORS 3-15 TABLE 3-5 CABLE SOURCES FOR RS-485 LINES OVER 1500 FEET 3-21 TABLE 3-6 CABLE SOURCES FOR RS-485 LINES UNDER 1500 FEET 3-22 TABLE 4-1...

  • Page 8: Figure 1-1 Netclock/Gps Master Clock

    Illustrations road map Net-per.cgm FIGURE 1-1 NETCLOCK/GPS MASTER CLOCK FIGURE 2-1 ANTENNA INSTALLATION 8226_b.eps FIGURE 2-2 CABLE CLAMP INSTALLATION Net-pc.cgm FIGURE 3-1 NETCLOCK/GPS FRONT PANEL Net-fr.cgm FIGURE 3-2 NETCLOCK/GPS REAR PANEL Net-bk.cgm FIGURE 3-3 SERIAL COMM PIN NUMBERING Femdin.pcx FIGURE 3-4 REMOTE OUTPUTS Remotout.cgm FIGURE 3-5...

  • Page 9: General Information

    SECTION 1: GENERAL INFORMATION INTRODUCTION FEATURES WARRANTY INFORMATION AND PRODUCT SUPPORT MANUAL ERRATA AND SPECIAL DOCUMENTATION UNPACKING SPECIFICATIONS...

  • Page 10: Introduction

    GENERAL INFORMATION INTRODUCTION The Spectracom NetClock/GTP Master Clock, shown in Figure 1-1, is a precise, traceable Global Time Provider. The NetClock/GTP receives and recovers time information from the Global Positioning System (GPS) constellation of satellites. The GPS constellation consists of 24 satellites placed in 6 orbital planes spaced equally around the equator and inclined at a 55-degree angle.
  • Page 11 WARRANTY INFORMATION AND PRODUCT SUPPORT Warranty information is found on the leading pages of this manual. Should it become necessary to exercise the warranty, contact Spectracom Corporation to obtain a replacement or service. Spectracom continuously strives to improve its products and greatly appreciates any and all customer feedback.

  • Page 12: Unpacking

    Retain the carton and packing materials in the event the carrier wishes to witness the shipping damage. Failing to report shipping damage immediately may forfeit any claim against the carrier. In addition, notify Spectracom Corporation of shipping damage or shortages, to obtain replacement or repair services.

  • Page 13: Specifications

    Section 1: General Information SPECIFICATIONS This section contains specifications for the Model 8183A NetClock/GTP, Model 8225 GPS Antenna and antenna accessory products available from Spectracom. 1.5.1 Receiver Received Standard: L1 C/A Code transmitted at 1575.42 MHz. Satellites Tracked: Up to eight simultaneously.

  • Page 14: Serial Comm

    Section 1: General Information Time Sync: Indicates accuracy of time data outputs. Lamp is green when the receiver has tracked at least one satellite within the period allotted for the Time Sync Alarm. The lamp is red during initial operation and when a Time Sync Alarm is asserted.

  • Page 15: Faa Irig B Outputs

    Section 1: General Information Accuracy: Data stream on time marker within ± 100 microseconds of UTC for Formats 0, 1, 3, and 90 selected. Formats 2 and 4 are within ±1 millisecond of UTC. Configuration: Baud rate and output data formats are selected using the Serial Setup Interface.

  • Page 16: Standard 10 Mhz Output

    Section 1: General Information 1.5.8 Standard 10 MHz Output Signal: 10 MHz sinewave. Signal Level: 350 mVrms into 50 ohms. Harmonics: Better than 30 dB down. Spurious: Better than -35 dB down. Accuracy: ± 1 x 10 when tracking GPS and under constant temperature and humidity.

  • Page 17: Mechanical Specifications

    Section 1: General Information 1.5.11.2 Mechanical Specifications Assembled Length: 24 inches (61 cm) Housing Diameter: 3.5 inches (8.9 cm). Housing Material: PVC. Assembled Weight: 1.3 lbs. (.60 kg). Mounting: Hose clamps (furnished) on vent pipe. 1.5.12 Model 8226 Impulse Suppressor Connectors: Type N Female.

  • Page 18: Introduction

    SECTION 2: INSTALLATION INTRODUCTION MODEL 8225 GPS ANTENNA ANTENNA CABLE MODEL 8226 IMPULSE SUPPRESSOR MP10-0000-0001 COPPER GRONDING PANEL MODEL 8227 GPS INLINE AMPLIFIER NETCLOCK/GPS PREPARATION FOR USE INITIAL OPERATION QUALIFYING THE INSTALLATION...

  • Page 19: Introduction

    The hose clamps can be used to affix the mast assembly to a vent pipe. Spectracom offers an antenna base, Model 8213, for installations where vent pipe mounting is not practical or desired. The Model 8213 is constructed of aluminum and is furnished with ballast for stability.

  • Page 20: Antenna Cable

    FIGURE 2-1 ANTENNA INSTALLATION ANTENNA CABLE Spectracom recommends RG-213 type coax, such as Belden 8267, for the GPS antenna cable. To simplify the installation process, Spectracom offers GPS cable assemblies terminated with Type N male or BNC male connectors. Specify part number CA07xxx, where xxx equals the length in feet, for a cable terminated with Type N connectors.

  • Page 21: Cable Lengths

    Amplifier. MODEL 8226 IMPULSE SUPPRESSOR Spectracom recommends the use of an inline coaxial protector for all products with an outside antenna. Spectracom offers the Model 8226, Impulse Suppressor, to protect the receiver from damaging voltages occurring on the antenna coax. Voltages exceeding the impulse suppresser trip point are shunted to the system ground.

  • Page 22: Figure 2-3 Connector Assembly Instructions

    Each Model 8226 includes two clamp type male N connectors. These connectors can be used to splice the Model 8226 into the antenna coax. The connectors are compatible with RG-213 type coax such as Spectracom CA07xxx or Belden 8267. Connector assembly instructions are shown in Figure 2-3.

  • Page 23: Mp10-0000-0001 Copper Grounding Panel

    MP10-0000-0001 COPPER GROUNDING PANEL A single point ground system is recommended to provide optimum protection from lightning strikes. Spectracom offers a copper grounding panel, part number MP10- 0000-0001, as a single point ground connection for the antenna surge suppressor, equipment rack, GPS receiver and other surge protection devices to a perimeter ground system.

  • Page 24: Model 8227 Gps Inline Amplifier

    MODEL 8227 GPS INLINE AMPLIFIER An inline amplifier is required whenever GPS antenna cable lengths cause greater than 20 dB attenuation. Using Spectracom CA07xxx or Belden 8267 coax, an amplifier is needed whenever antenna cable lengths exceed 200 feet. The Model 8227 GPS Inline Amplifier, shown in Figure 2-5, extends the maximum cable length to 400 feet.

  • Page 25: Netclock/Gps Preparation For Use

    Section 2: Installation FIGURE 2-6 CABLE GUIDELINES NETCLOCK/GTP PREPARATION FOR USE This section outlines the set-up procedure to prepare the NetClock/GTP for operation. 2.6.1 Antenna Connection Install the Model 8225 Antenna as outlined previously in this section. Connect the antenna cable to the rear panel GPS ANTENNA connector. 2.6.2 Power Connection The NetClock/GTP can be powered from a 12 to 36 VDC power source.

  • Page 26: Chassis Ground

    Section 2: Installation 2.6.3 Chassis Ground The chassis ground lug allows the NetClock/GTP chassis to be connected to an earth ground or single point ground. Connecting the chassis to a single point ground system may be required in some installations to ensure optimum lightning protection. An earth ground is also recommended in installations where excessive noise on the power line degrades receiver performance.
  • Page 27 Section 2: Installation The following paragraphs contain configuration examples of the front panel display, IRIG, RS-232 serial communication ports and the RS-485 Remote Output. Configuration entries or keystrokes are shown in BOLD ITALICS. Commands are terminated or executed by the enter key <ent>. The responses from the NetClock/GTP are shown in ITALICS.
  • Page 28 Section 2: Installation Example: Configure the front panel display for 24 hour format, Eastern Time with Daylight Saving Time. Type: SM ON <ent> Response: SET MODE ON Type: FPF 24 -05:00 1 <ent> Response: FRONT PANEL FORMAT = 24 HOUR TIME DIFF = -05:00 DST = 1 2.6.4.2 IRIG Configuration...
  • Page 29 Section 2: Installation 2.6.4.3 RS-232 Serial Comm and RS-485 Remote Output Configuration The NetClock/GTP has several time data formats available to suit various applications. Data Formats 0, 1 and 3 can be configured to provide local time with or without Daylight Savings Time corrections.

  • Page 30: Initial Operation

    Section 2: Installation Where: 0 = No DST, always Standard Time 1 = North America 2 = United Kingdom 3 = Continental Europe 4 = China 5 = Australian 1 6 = Australian 2 Example: Set the Serial Comm 1 to respond with Data Format 02 whenever a T is received.

  • Page 31: Qualifying The Installation

    Section 2: Installation QUALIFYING THE INSTALLATION Typically, the front panel TIME SYNC lamp turns green within 20 minutes of power on. This lamp indicates that receiver is tracking at least one qualified satellite. If the GPS LOCK lamp does not change from red to green, a cable or reception problem may exist. Refer to Section 5.1 for troubleshooting assistance.

  • Page 32: Tracking Histogram

    Section 2: Installation Tracking: The receiver must track at least one qualified satellite to operate. Typically, the receiver shall track 6 or more satellites with the Model 8225 GPS Antenna. If the Model 8228 indoor window mount antenna is used, the receiver will typically track 4 or more satellites.
  • Page 33 Section 2: Installation An example response is shown below: TIME= 16:00:00 DATE= 2000-05-11 QUALIFIED HISTOGRAM 0= 00000 1= 00026 2= 00287 3= 03287 4= 00000 5= 00000 6= 00000 7= 00000 8= 00000 Q= 03600 TIME= 17:00:00 DATE= 2000-05-11 QUALIFIED HISTOGRAM 0= 00000 1= 00000 2= 00429 3= 02292 4= 00879 5= 00000 6= 00000 7= 00000 8= 00000 Q= 03600 TIME= 18:00:00 DATE= 2000-05-11 QUALIFIED HISTOGRAM...

  • Page 34: Front Panel Functions

    SECTION 3: OPERATION INTRODUCTION FRONT PANEL FUNCTIONS REAR PANEL FUNCTIONS DATA FORMAT DESCRIPTION REMOTE OUTPUT USAGE...

  • Page 35: Display

    OPERATION INTRODUCTION This section describes the front and rear panel functions and operational information for the NetClock/GTP. FRONT PANEL FUNCTIONS Refer to Figure 3-1, NetClock/GTP Front Panel, and the following paragraphs for front panel functions. 3.1.1 Display The front panel display provides GPS synchronized time. The display characters are red LED digits measuring 0.8 inches high for the day of year, hours and minutes, and 0.56 inches for the seconds.
  • Page 36 Section 3: Operation FIGURE 3-1 NETCLOCK/GTP FRONT PANEL Page 3-2 NetClock/GTP Instruction Manual...

  • Page 37: Time Sync Lamp

    Section 3: Operation The lamp remains green if the receiver continues to track, or has tracked, at least one qualified satellite within the period allotted for the GPS Lock Alarm. The default period is set for 15 minutes. The GPS Lock Alarm period can be configured up to 24 hours using the LOCK command.

  • Page 38: Rear Panel Functions

    Section 3: Operation REAR PANEL FUNCTIONS Refer to Figure 3-2, NetClock/GTP Rear Panel, and the following paragraphs for rear panel functions. 3.2.1 GPS Antenna This BNC connector is the antenna input to the GPS receiver. The Model 8225 GPS Antenna and the Model 8227 Inline Preamplifier receive operational power, +5 VDC, from this connector.

  • Page 39: Figure

    Section 3: Operation FIGURE 3-2 NETCLOCK/GTP REAR PANEL NetClock/GTP Instruction Manual Page 3-5...

  • Page 40: Faa Irig B Outputs

    Section 3: Operation 3.2.4 FAA IRIG-B Outputs IRIG is an acronym for Inter-Range Instrumentation Group. In the late 1950’s this group created a series of time code standards suitable for use with recording oscillographs, magnetic tape and real time transmission. Each IRIG code specifies a carrier frequency that is modulated to encode date and time, as well as control bits to time stamp events.

  • Page 41: Serial Communication Ports

    Section 3: Operation 3.2.5 RS-232 Serial Communication Ports The NetClock/GTP has two serial communication ports labeled Serial Comm 1 and Serial Comm 2. These ports provide an ASCII RS-232 data stream in the selected data format. There are five time data format selections and one position data stream in NMEA 0183 format available.

  • Page 42: Figure

    Section 3: Operation Per EIA/TIA-574 standard, the NetClock/GTP Serial Comm ports are classified a data circuit-terminating equipment or DCE. Data is output on Pin 2, RXD and time commands are input on Pin 3, TXD. When connecting to data terminal equipment, DTE, (i.e.

  • Page 43: Serial Setup Interface

    A Terminal (-) FIGURE 3-6 RS-485 OUTPUT Spectracom offers many devices that accept the RS-485 data stream as an input reference. These products include display clocks, RS-485 to RS-232 converters, NTP time provider, talking clocks and radio link products to meet various time applications and requirements.

  • Page 44: Status Messages

    The Serial Setup Interface is also used to update the flash memory with new code. This feature allows implementation of new features or code changes into field installed units. Upgrade announcements are posted on the Spectracom WEB page as they become available. The Internet address is www.spectracomcorp.com.
  • Page 45 SmartWatch Invalid: A failure has been detected with the non-volatile RAM/Timekeeping integrated circuit. Memory is retained using lithium batteries having a minimum life expectancy of ten years. Contact Spectracom for IC replacement. Test Mode: Unit is placed in Test Mode operation.

  • Page 46: Dc Power

    Section 3: Operation 3.2.9 DC Power The NetClock/GTP can be powered from a 12 to 36 VDC power source. Power consumption is 6 Watts. Connect the positive power connection to the red bannana jack and the negative to the black. The unit is fuse protected and controlled by the front panel locking toggle power switch.

  • Page 47: Format 0

    Section 3: Operation 3.3.1 Format 0 Format 0 includes a time sync status character, day of year, time reflecting time zone offset and DST corrections when enabled. Format 0 also includes the DST/Standard Time indicator, and the time zone offset value. Format 0 data structure is shown below: CR LF I ^ ^ DDD ^ HH:MM:SS ^ DTZ=XX CR LF where:...
  • Page 48 Section 3: Operation Example: 271 12:45:36 DTZ=08 The example data stream provides the following information: Sync Status: Time synchronized to GPS Date: Day 271 Time: 12:45:36 Pacific Daylight Time D = DST, Time Zone 08 = Pacific Time Page 3-14 NetClock/GTP Instruction Manual...

  • Page 49: Format 1

    Section 3: Operation 3.3.2 Format 1 This format provides the fully decoded time data stream. Format 1 converts the received day of year data (001-366) to a date consisting of day of week, month, and day of the month. Format 1 also contains a time sync status character, year, and time reflecting time zone offset and DST correction when enabled.

  • Page 50: Format 2

    Section 3: Operation 3.3.3 Format 2 This format provides a time data stream with millisecond resolution. The Format 2 data stream consists of indicators for time sync status, time quality, leap second and Daylight Saving Time. Time data reflects UTC time and is in the 24-hour format.

  • Page 51: Table 3-4 Quality Indicators

    Section 3: Operation Inaccuracy Time Error Time Since Code (mSec) Unlock (Hours) Space <1 Locked <10 <10 <100 <100 <500 <500 >500 >500 TABLE 3-4 QUALITY INDICATORS The leap second indicator L is defined as: (Space) = When a leap second correction is not scheduled for the end of the month.

  • Page 52: Format 3

    Section 3: Operation 3.3.4 Format 3 Format 3 provides a format identifier, time sync status character, year, month, day, time with time zone and DST corrections, time difference from UTC, Standard time/DST indicator, leap second indicator and on-time marker. Format 3 data structure is shown below: FFFFI^YYYY ^HHMMSS±HHMMD L # CR LF...
  • Page 53 Section 3: Operation During periods of standard time for the selected DST schedule. During the 24-hour period preceding the change into DST. During periods of Daylight Saving Time for the selected DST schedule. During the 24-hour period preceding the change out of DST. The leap second indicator L is defined as: (Space) = When a leap second correction is not scheduled at the end of the...

  • Page 54: Format 4

    Section 3: Operation 3.3.5 Format 4 Format 4 provides a format indicator, time sync status character, modified Julian date, time reflecting UTC with 0.1 millisecond resolution and a leap second indicator. Format 4 data structure is shown below: FFFFIMJDXX^HHMMSS.SSSS^L CR LF where: FFFF = Format Identifier (0004)

  • Page 55: Format 90

    Section 3: Operation 3.3.6 Format 90 Format 90 provides a position data stream in NMEA 0183 GPGGA GPS Fix data format. The Format 90 data structure is shown below: $GPGGA,HHMMSS.SS,ddmm.mmmm,n,dddmm.mmmm,e,Q,SS,YY.y,+AAAAA.a,M,,,,*CC CR LF where: $GP = GPS System Talker GGA = GPS Fix Data Message HHMMSS.SS = Latest time of Position Fix, UTC.
  • Page 56 Section 3: Operation Example: $GPGAA,151119.00,4307.0241,N,07729.2249,W,1,06,03.2,+00125.5,M,,,,*3F The example data stream provides the following information: Time of Position Fix: 15:11:19.00 UTC Latitude: 43° 07.0241’ North Longitude: 77° 29.2249’ West Quality: 3D fix Satellites Used: Dilution of Precision: Antenna Height: +125.5 meters above sea level Check Sum: Page 3-22 NetClock/GTP Instruction Manual...

  • Page 57: Remote Output Usage

    RS-485 ideal for distributing time data throughout a facility. The Remote Output can drive 32 devices over cable lengths up to 4000 feet. Spectracom manufactures wall clocks, talking clocks, NTP time providers, RS- 485 to RS-232 converters and radio link products that utilize the RS-485 data stream as an input.

  • Page 58: Connection Method

    Section 3: Operation For cable runs less than 1500 feet, a lower-cost twisted pair cable may be used. Refer to Table 3-6 for possible sources. MANUFACTURER PART NUMBER Alpha Wire Corporation 5471 1-800-52ALPHA Belden Wire and Cable Company 9501 1-800-BELDEN-1 Carol Cable Company C0600 606-572-8000...

  • Page 59: Figure 3-9 Split Bus Configuration

    FIGURE 3-9 SPLIT BUS CONFIGURATION Most RS-485 connections found on Spectracom equipment are made using a removable terminal strip. Wires are secured by a jaw that compresses the wires when tightened. When using small diameter wire, 22-26 gauge, a strain relief can be fashioned by wrapping the stripped wire over the insulating jacket as shown in Figure 3-10.

  • Page 60: Figure 3-10 Wire Strain Relief

    Section 3: Operation STRIP WIRE WRAP WIRE OVER INSULATING JACKET INSERT AND TIGHTEN FIGURE 3-10 WIRE STRAIN RELIEF Page 3-26 NetClock/GTP Instruction Manual...

  • Page 61: Figure 3-11 Timeview Rs-485 Interface

    Section 3: Operation The Spectracom Model 8175, TimeView 230, is a display clock with 2.3 inch high digits. The Model 8177 TimeView 400 features 4.0 inch display digits. TimeView display clocks use a 6-position terminal block to connect to the RS-485 data bus.

  • Page 62: Figure 3-13 Model 8188 Rs-485 Interface

    Section 3: Operation Spectracom Model 8188 is an Ethernet Time Server that supports NTP and SNTP time protocols. The Model 8188 accepts either Format 0 or Format 2 and connects to the RS-485 data bus through a terminal block to DB25 adapter.

  • Page 63: Termination

    The RS-485 data bus can be split in two directions as shown in Figure 3-9. In a split bus configuration, terminate the devices installed on each end of the bus. Most Spectracom products include a built in termination switch to terminate the RS-485 bus when required.

  • Page 64: Software Commands

    SECTION 4: SOFTWARE COMMANDS INTRODUCTION 4.1...4.22 RS-232 COMMAND SET...

  • Page 65: Figure 4-1 Command Structure

    SOFTWARE COMMANDS INTRODUCTION From the rear panel Serial Setup Interface port the user may configure, control and monitor the NetClock/GTP. Table 4-1 provides a listing of the command set in alphabetical order. These commands contain a hierarchy of Read, Set and Test Modes.

  • Page 66: Table 4-1 Alphabetical List Of Commands

    Section 4: Software Commands COMMAND Description Mode Section Antenna Cable Delay CONF Display Output Configuration Read Display Alarm Log Read DATE Date Set to Factory Defaults Test Display Tracking Histogram Read Display DST rules Read Front Panel Display format GPS Signal Strength Read HELP Help Display...

  • Page 67: Antenna Cable Delay

    Section 4: Software Commands ANTENNA CABLE DELAY The command, ACD, reads or sets the antenna cable delay value expressed in microseconds. The on-time point is offset by the delay value entered to compensate for antenna cable and in-line amplifier delays. The expected cable and amplifier delays are typically negligible.

  • Page 68: Display Output Configuration

    Section 4: Software Commands DISPLAY OUTPUT CONFIGURATION The command, CONF, displays the current settings for the clocks outputs. To view the output configurations, issue the CONF command as shown below: Type: CONF<ent> Default response: FRONT PANEL FORMAT= 24 HOUR TIME DIFF= +00:00 DST= 0 IRIG FORMAT= FAA TIME DIFF= +00:00 DST= 0 SERIAL PORT 1...

  • Page 69: Display Alarm Log

    Section 4: Software Commands DISPLAY ALARM LOG The command, DAL, causes the clock to output the alarm history log. Each time a change in alarm status occurs, an alarm log is created. An alarm log includes the UTC time and date of the log, event relay status, alarm relay status and lists the conditions causing the alarms.

  • Page 70: Date

    Section 4: Software Commands DATE The DATE command reads or sets the date of the NetClock/GTP. To retrieve the current UTC date, issue the DATE command as shown below: Type: DATE <ent> Response: DATE = YYYY - MM - DD Where: = Year value, 1999, 2000, 2001, etc.

  • Page 71: Restore Factory Defaults

    Section 4: Software Commands RESTORE FACTORY DEFAULTS The DEF command returns all selectable parameters to the factory default settings. The clock must be placed in Test Mode to execute the DEF command. The factory default settings are listed below: FRONT PANEL FORMAT= 24 HOUR TIME DIFF= +00:00 DST= 0 IRIG FORMAT= FAA TIME DIFF= +00:00 DST= 0...

  • Page 72: Display Tracking Histogram

    Section 4: Software Commands DISPLAY TRACKING HISTOGRAM This command outputs the tracking histogram. The histogram records the number of qualified satellites tracked each second. At the end of every hour, a log entry is created and the counters start again. The command responds with the last four hourly entries of the histogram and current histogram in process.
  • Page 73 Section 4: Software Commands Example: To view the satellite tracking histogram type the following: Type: DH <ent> Typical response: TIME= 16:00:00 DATE= 2001-04-08 QUALIFIED HISTOGRAM 0= 00000 1= 00000 2= 00000 3= 00000 4= 00000 5= 00000 6= 00000 7= 01109 8= 02491 Q= 03600 TIME= 17:00:00 DATE= 2001-04-08 QUALIFIED HISTOGRAM 0= 00000 1= 00000 2= 00000 3= 00000 4= 00000 5= 00000 6= 00414 7= 03186 8= 00000 Q= 03600...
  • Page 74 Section 4: Software Commands DAYLIGHT SAVING TIME Daylight Saving Time corrections can be implemented on the NetClock/GTP display, IRIG, Serial Comm and Remote Outputs. Each output has a configuration command that allows selection of a DST rule applied to that output. There are six DST rules to choose from numbered 1 through 6.
  • Page 75 Section 4: Software Commands Any of the six DST rules can be modified to keep up with changes in DST implementation. Rules are structured in a week # - day of week - month or a month - day format. To change when DST begins (into date), issue the following command: Type: DSTX IN WWWW DDD MMM HH:MM...
  • Page 76 Section 4: Software Commands Example: Congress has decided to extend Daylight Saving time by 2 weeks. DST will now start the last Sunday in March and end on the first Sunday in November. The time of the change (2:00am), and the amount of the change (1 hour) remains unchanged. Follow the steps below to implement the new North American DST rule.

  • Page 77: Daylight Saving Time

    Section 4: Software Commands FRONT PANEL FORMAT The command, FPF, reads and sets the front panel display configuration. Display options include 12 or 24 hour display format, UTC or local time with or without DST corrections. To view the current display configuration, issue the FPF command as shown below: Type: FPF <ent>...

  • Page 78: Figure 4-2 Time Difference Map

    Section 4: Software Commands FIGURE 4-2 TIME DIFFERENCE MAP Page 4-14 NetClock/GTP Instruction Manual...
  • Page 79 Section 4: Software Commands GPS SIGNAL STATUS The GPS Signal Strength command, GSS, provides an indication of receiver operation and quality of the received GPS signal. This command is useful in verifying proper antenna placement and receiver performance during installation. The GSS response provides overall tracking status, position solution and a table containing individual satellite data.
  • Page 80 Section 4: Software Commands SSSS = Fix Mode; SEARCHING, 2D-FIX, 3D-FIX. Searching is the typical mode when using the window mount antenna. 2D-FIX is possible if the receiver is tracking at least three qualified satellites. The receiver latitude and longitude can be determined from a 2D-Fix. 3D-FIX is possible if the receiver is tracking at least four qualified satellites.
  • Page 81 Section 4: Software Commands Information on each satellite currently being tracking is presented in table form. The table columns are described below: CHAN = Channel Number of the GPS receiver, 01...08 VID = Vehicle (satellite) Identification Number, 01...37 MODE = Channel Tracking Mode, 01...08.

  • Page 82: Gps Signal Strength

    HELP <ent> - OR - ? <ent> Response: SPECTRACOM CORPORATION NETCLOCK/GTP COMMAND LIST FOLLOWS (SET MODE MUST BE ON TO CHANGE PARAMETERS) TIME [HH:MM:SS] = CURRENT UTC TIME DATE [YYYY-MM-DD] = CURRENT UTC DATE LOC [D DD MM SS.sss D DDD MM SS.sss] = CURRENT LOCATION...

  • Page 83: Irig Configuration

    Section 4: Software Commands 4.11 IRIG CONFIGURATION The command, IRIG, reads and sets the IRIG output configuration. IRIG time can be set for UTC or local time with or with DST corrections. The current IRIG output configuration can be viewed using the IRIG command as shown below: Type: IRIG <ent>...

  • Page 84: Location

    Section 4: Software Commands 4.12 LOCATION The command, LOC, is for reading or setting the current location of the receiver. This command displays the current latitude and longitude calculated by the GPS receiver. During initial installation, time to first fix may be decreased if the user inputs an approximate position using this command.

  • Page 85: Gps Lock Time Out

    Section 4: Software Commands 4.13 GPS LOCK TIME OUT The LOCK command reads or sets the GPS lock time out period. A timer is started whenever the receiver is not tracking any satellites. The timer is reset when the receiver reacquires a satellite. A GPS lock alarm is asserted if the receiver fails to reacquire satellites within the allotted time out period.

  • Page 86: Remote Output Configuration

    Section 4: Software Commands 4.14 REMOTE OUTPUT CONFIGURATION The command REM 1 reads or sets the configuration of the RS-485 Remote Output. Remote Output configuration options include: baud rate, data format, UTC or local time with or without DST corrections. To view the current Remote Output configurations, issue the command REM1 as shown below: Type:...

  • Page 87: Reset Gps Receiver

    Section 4: Software Commands 4.15 RESET GPS RECEIVER The command, RGPS, completely resets the GPS receiver. This is a radical procedure and should only be done if the receiver fails to acquire satellites. The RGPS command returns the receiver to default values. Next, a self-test is performed on the receiver. If the self-test is successful, a pass message is included in the response.

  • Page 88: Serial Comm Configuration

    Section 4: Software Commands 4.16 SERIAL COMM CONFIGURATION The commands, SER1 and SER2, read or set the configuration of the Serial Comm outputs. Serial Comm configuration options include baud rate, data format, request character, UTC or local time with or without DST corrections. To view the current Serial Comm configurations issue the SERx command as shown below: Type:...
  • Page 89 Section 4: Software Commands NOTES: A once-per-second output is enabled when the request character is set for NONE. The time contained in data formats 02, 04, and 90 always reflect UTC time. The time difference parameter in the Serial Comm configuration command has no effect on output time.

  • Page 90: Set Mode

    Section 4: Software Commands 4.17 SET MODE This command is used to read or enter Set Mode operation. As a safeguard, the unit must be placed into Set Mode whenever operational parameters are entered. The unit “times out” of Set Mode and returns to Read Mode operations if no commands are issued for 15 minutes.

  • Page 91: Status Command

    Section 4: Software Commands 4.18 STATUS COMMAND The STAT command provides the current UTC time and date, Time Sync status, GPS Lock status, time remaining in GPS Lock and Time Sync timers and Oscillator Lock status. To retrieve the operational status, issue the STAT command as follows: Type: STAT <ent>...

  • Page 92: Sync Time Out

    Section 4: Software Commands 4.19 SYNC TIME OUT The SYNC command reads or sets the Sync Time Out period. A timer is started whenever the receiver is not tracking any satellites. The timer is reset when the receiver reacquires a satellite. A Time Sync Alarm is asserted if the receiver fails to reacquire satellites within the allotted time out period.

  • Page 93: Time

    Section 4: Software Commands 4.20 TIME The command, TIME, reads or sets the time of the NetClock/GTP. To retrieve the current UTC time, issue the TIME command as shown below: Type: TIME <ent> Response: TIME = HH:MM:SS Where: = UTC hours 00...23 = Minutes 00...59 = Seconds 00...60 To set the time, place the clock in Set Mode and issue the TIME command as follows:...

  • Page 94: Test Mode

    Section 4: Software Commands 4.21 TEST MODE This command is used to read or enter Test Mode operation. Test Mode commands are used in factory testing and field troubleshooting. The unit “times out” of Test Mode and returns to Read Mode if no commands are issued for 15 minutes. Major and Minor alarms are asserted whenever the clock is in Test Mode.

  • Page 95: Version Command

    The time and date the unit was first powered ON is recorded. To retrieve version information, issue the VER command as shown below: Type: VER <ent> Example Response: Spectracom Corporation NetClock/GTP Model 8183A Software Version 1.0.0 Date: May 18, 2001 09:14:48 Unit Started 20:42:39 2001-05-15 Front Panel Version 2.00 IRIG Version 9.01 Serial Port 1 Version 2.03...

  • Page 96: Service Information

    SECTION 5: SERVICE INFORMATION INTRODUCTION RECEPTION TROUBLESHOOTING TCXO ADJUSTMENT...

  • Page 97: Introduction

    TCXO oscillator. RECEPTION TROUBLESHOOTING Please review this section prior to calling the Spectracom Customer Service Department. If the reception problem can not be solved by following the guidelines outlined in this section, please call for Customer Service at 585-321-5800.

  • Page 98: Low Gps Quality

    Section 5: Service Information GPS reset: In rare occasions, the GPS receiver may require a reset to set the receiver to default values. The receiver must be placed in Test Mode to issue the GPS Reset command. Issue the GPS Reset command, RGPS, as shown below: Type: TM ON <ent>...

  • Page 99: Table 5-2 Television Stations With Gps Jamming Potential

    87.3 - 87.7 TABLE 5-3 FM RADIO FREQUENCIES WITH GPS JAMMING POTENTIAL If relocating the antenna away from the interfering source does not solve the problem or if relocation is not possible contact Spectracom Tech Support for assistance. NetClock/GTP Instruction Manual...

  • Page 100: Oscillator Adjustment

    Section 5: Service Information OSCILLATOR ADJUSTMENT Over time the NetClock/GTP TCXO oscillator may require an adjustment to compensate for crystal aging. The NetClock/GTP warns when this adjustment is needed by asserting an Adjust Oscillator Alarm. This condition causes the front panel display to flash all 8’s every three seconds and activates the Minor Alarm relay.
  • Page 101 Section 5: Service Information Connect the frequency counter to the rear panel FREQ output connector. Locate the TCXO oscillator, labeled Y010-0106-0H00, in the front right corner of the circuit board. Adjust the TCXO in very small amounts until a frequency of 10 MHz ±5 Hz is obtained. Set the D/A control voltage to its maximum value by sending the SHI command as shown below: Type: SHI<ent>...
  • Page 102 APPENDIX A: IRIG CODE DESCRIPTION INTRODUCTION FAA IRIG B CODE...

  • Page 103: A.0 Introduction

    FAA IRIG CODE DESCRIPTION INTRODUCTION This Appendix contains a detailed description of the FAA modified IRIG B code. The FAA modifies the IRIG B code by including satellite lock status and time error flags in the Control Function Field. The error flags provide an inaccuracy estimate based on the time elapsed since loss of GPS lock.

  • Page 104: Appendix Afaa Irig Code Description

    Appendix A: FAA IRIG Code Description FIGURE A-1 FAA IRIG B TIME CODE Page A-2 NetClock/GTP Instruction Manual...
  • Page 105 Appendix A: FAA IRIG Code Description Position identifier: 8 millisecond duration. Reference marker, 1 per second. The reference marker appears as two consecutive position identifiers. The second position identifier marks the on-time point for the succeeding code word. Resolution: 10 milliseconds. Code word structure: BCD: Word seconds digits begin at index count 1.

  • Page 106: Table A-1 Faa Time Error Indicators

    Appendix A: FAA IRIG Code Description ±1 ±5 ±50 ±500 Time Since Lock Loss of Lock Status/Error Indicator msec msec msec msec Locked Error< 2us Unlocked < 00:16:40 Error < 1 ms 00:16:41 Unlocked Error < 5 ms 01:23:39 01:23:40 Unlocked Error <...

This manual is also suitable for:

8183a gtp

Table of Contents