MARCH 2000 39004 39005 T1 Fiber Optic Line Extender/Simulator TX FO TX RX FO/S C RX I/F LL CUSTOMER SUPPORT INFORMATION DL P LOO Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.
FCC INFORMATION FEDERAL COMMUNICATIONS COMMISSION AND INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4. Todas las instrucciones de operación y uso deben ser seguidas.
NOM STATEMENT 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13. Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato. 14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante. 15.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR General Safety Precautions Transport, Installation, and Operation • Avoid excessive vibration and shocks. • Avoid contact with water and dust. • Avoid excessive direct sunlight. • Ensure sufficient cooling. • Prevent loose items from falling into the device. Fiber Optics • Looking into the fiber optic output can cause injury to the eyes. When observation is necessary, avoid exceeding the limits recommended in ANSI Z136.1-1981.
TRADEMARKS TRADEMARKS USED IN THIS MANUAL ST® is a registered trademark of American Telephone and Telegraph Company. Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR Contents 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.
CHAPTER 1: Specifications 1. Specifications Maximum Distance—39004: 3 mi. (4.8 km) @ 16 dB; 39005: 24 mi. (38.6 km) @ 16 dB Speed—1.544 Mbps Interface—DTE: T1, G.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR 2. Introduction 2.1 Description The T1 Fiber Optic Line Extender/Simulator lets you combine fiber optic technology with standard interfaces at 1.544 Mbps. The advantages are increased transmission distances and immunity to electrical interference. Connections between buildings become possible since no lightning currents can arise. 2.2 Features • Extend or interconnect T1 lines, PBXs, or T1 muxes across distances up to 3 miles (4.8 km) via a pair of these devices.
CHAPTER 3: Connectors, Indicators, and Controls 3. Connectors, Indicators, and Controls 10 9 1 TX RX I/F FO FO/S C RX TX LL DL LOOP 2 3 4 5 6 7 8 A Figure 3-1. Front and Rear Panels. Table 3-1. Connectors, Indicators, and Controls No. Connector, Indicator, or Control 1 2 3 4 5 6 7 8 9 10 TX LED: Transmitting binary 0 via fiber optic G.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR 4. Setup Back panel Front panel Main board Figure 4-1. Location of Jumpers on the Printed Circuit Board.
CHAPTER 4: Setup Table 4-1. Key, Jumper, and Switch Settings Number Setting Description 1 Loop Mode Key: Press the key switches through the following operating modes: Normal operation, Digital loop, Remote loop. The unit enters loop mode when the distant modem gets switched to remote loop. 2 Clock Source Internal Remote External 3 Interface Speed 1.544 kbps 1544 All other settings are not applicable. Position D 4 5 Processor Connector Not used.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR Table 4-1 (continued). Key, Jumper, and Switch Settings Number Setting Description 8 Sample mode for incoming intermediate frequency (I/F) data Data sampled on positive clock edge (std.) Data sampled on negative clock edge 9 Interface Mode NT (Network Termination) TE (Terminal Equipment) 10 Interface Pin 1 Potential Floating Connected to frame ground 11 Transmission Mode Switch setting is mandatory. Switches 1, 2, and 4 must be in OFF position.
CHAPTER 4: Setup Clock Mode Comments: • Internal: The clock is generated by the internal clock generator. • External: The clock is provided by the local equipment. • Remote: The local modem receives the clock via the link from the distant modem. The distant modem must be set to Internal or External. Figure 4-2. Possible Synchronous Clock Configurations.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR 5. Data Signals Local fiber optic modem in normal mode Distant fiber optic modem Figure 5-1. Data Signals at Normal Mode. Local fiber optic modem in digital loop mode Distant fiber optic modem Figure 5-2. Data Signals at Digital Loop Mode.
CHAPTER 5: Data Signals Local fiber optic modem switched to remote loop mode Fiber optic modem forced to loop mode by other modem Figure 5-3. Data Signals at Remote Loop/Line Loop Mode. Table 5-1. G.703 Pinout (Female) Pin Signal Terminal End Network Termination 2 4 9 11 RA TA RB TB Input Output Input Output Output Input Output Input Figure 5-4. G.703 Connector.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR Appendix: Fiber Optic Planning Guidelines A.1 Introduction Designing a fiber optic link means considering two main physical limitations: System attenuation and fiber optic dispersion. Attenuation results when properties of the fiber optic link reduce the intensity of the fiber optic signals. Dispersion occurs in high-speed links and causes degradation of fiber optic signals, disabling the receiver that would interpret them correctly.
APPENDIX: Fiber Optic Planning Guidelines A.2 Fiber Optic Calculation STEP 1: ATTENUATION CONSIDERATIONS Figure A-1 shows the various elements of the fiber optic link that decrease light intensity. Depending on the real installation, you must subtract a series of attenuation (att.) values from the raw optic output level of the fiber optic transmitter. The remainder of the originally transmitted light at the receiver must be at least as high as the minimum receiver sensitivity.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR (max, cable [2] att.)=(fiber optic power budge) - (right part att.) = 17 dB - 12 dB = 5 dB. (max. cable [2] length) = (max.cable [2] att.)/(cable [2] att. factor) = 5 dB/3 dB/km = 5.6 km Example 2: Maximum length of cable [2] when connected directly (without splices, etc.): (max. cable [2] length) = (fiber optic power budget)/(cable [2] att. factor) = 17 dB/3 dB/km = 5.
APPENDIX: Fiber Optic Planning Guidelines STEP 2: OVERALL OPERATION CONSIDERATIONS The operation diagram (Figure A-2) shows one example diagram and one blank diagram to be completed based on real values: 1. Draw horizontal lines at the min. and max. value of the fiber optic pulse width* of the affected units. 2. Calculate the maximum total distance based on the calculations above and draw a vertical line. 3. Choose the correct dispersion line** based on fiber optic transmitter type*. 4.
T1 FIBER OPTIC LINE EXTENDER/SIMULATOR Figure A-2.
APPENDIX: Fiber Optic Planning Guidelines Use the example on the previous page as a reference when filling in information for your application below. Figure A-3. Your Application.
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