MicroNTU G.703–X.21
Contents
1. CSS BL ACK BOX nm E NS MT241A MicroNTU G 703 X 21 CUSTOMER Order toll free in the U S Call 877 877 BBOX outside U S call 724 746 5500 SUPPORT FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 INFORMATION Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com MicroNTU G 703 X 21 TRADEMARKS USED IN THIS MANUAL Other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged MicroNTU G 703 X 21 FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEM ENTS 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 It has been tested and found to comply with the limitsfor a Class A computing device in accordance with the specificationsin Subpart of Part 15 of FCC rules which are designed to provide reasonable protection against such interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to corre2. El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all alo descrito en lasinstrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio calificado El aparato el ctrico debe ser situado de tal manera que su posici n no interfiera su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor MicroNTU G 703 X 21 11 El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato 12 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n 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 atenci n a los contactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del
3. as Independent of Host As such the MicroNTU is only approved for use with a host and with host attachments that are either type approved in their own right or if supplied after March 1989 are covered by terms of the General Approval number N S G 1234 J 100003 A Host supplied under the terms of the General Approval number NS G 1234 J 100003 satisfies the conditions of the paragraph above The MicroNTU must not be modified in any way Any form of modification invalidatesthe approval for connection The terms of the approval require that there must be a minimum distance 5 mm between the MicroNTU and any other part of the host including other MicroNTU If voltages greater than 250V are present in the host users should refer to a competent safety engineer for advice Itisa condition of the approval that a copy of these user instructions and safety warnings must be supplied with the host Failure to provide the MicroNTU user instructions with the host will invalidate the MicroNTU approval Failure to install the MicroNTU in accordance with these instructions will invalidate the approval lt BLACK BOX Copyright 1997 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746
4. fabricante 15 En caso de existir una antena externa deber ser localizada lejos de las lineas de energia 16 El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilaci n 18 Servicio por personal calificado deber ser provisto cuando A El cable de poder o el contacto ha sido da ado u B Objectos han ca do o l quido ha sido derramado dentro del aparato o C El aparato ha sido expuesto a la lluvia o D El aparato parece no operar normalmente o muestra un cambio en su desempe o o E El aparato ha sido tirado o su cubierta ha sido da ada Contents Chapter Page T SpecificatiONS sn ai dio 7 2 INTO dUCtION ic AA Aia 8 2 1 Description mein 8 2 27 IFRatUr s sr nn item Ann nn ein ein aah aid 8 3 CONTIGUA MN errar dota 9 3 1 External DIP Switch Settings 0 0 cece ect ene eieeceeceeeeesieeeeaes 9 3 2 Internal Jumper Settings eeeeeecceee tees ee teeta testes teeteeeete 11 3 3 Power Supply Options cnmccnicininnnnnnninncnccnanccncnnenan narco ronca 15 EI A NN 16 4 1 Connecting to the G 703 Network 16 4 1 1 Twisted Pair 120 0 hm Connection sssini 16 4 1 2 Dual Coax BNC 75 O hm Connection isses 17 4 2 Connection to the Terminal Device esssssssrsreseerrreirrrnn 17 4 3 Connection to the Power Source 17
5. sense the configuration of the MicroNTU The operation of the MicroNTU isnot affected by this jumper setting Auto sense should be enabled when operating in 75 ohm balanced mode Current interface standards do not list this feature for 120 ohm balanced mode LK5 Setting Strap On Auto sense enabled Strap O ff Auto sense disabled LK6 and LK7 75 Ohm Termination Impedance This jumper sets the termination impedance correctly for 75 ohm operation Both jumpers must be in place when operating in 75 ohm unbalanced mode Conversely both jumpers must be removed when operating in 120 ohm balanced mode LK6 LK7 Setting On On 75 ohm operation Off O ff 120 ohm operation MicroNTU G 703 X 21 3 3 Power Supply Options The MicroNTU G 703 X 21 is available with three power supply options The Standard power supply option is factory configured for either 115 or 230 VAC The Universal Interface power supply option operates in environments ranging from 85 to 265 VAC with no reconfiguration necessary Call Technical Support for ordering information The DC power supply option operates in 48 VDC environments and is equipped with a 3 pin terminal strip style DC power cord Call Technical Support for ordering information WARNING There are no user serviceable parts in the power supply Voltage setting changes and fuse replacement should only be performed by qualified service personnel 4 Installaton Once the MicroNT
6. unit If the BER test equipment indicates no faults but the data terminal indicates a fault follow the manufacturer s checkout procedures for the data terminal Also check the interface cable between the terminal and the MicroNTU G 703 X 21 MicroNTU G 703 X 21 Appendix A Pin Configurations CCITT X 21 INTERFACE DB15 Frame Ground Transmit A Control A Receive A Indication A Signal Timing A Transmit B 9 Control B 10 Receive B 11 Indication B 12 Signal Timing B 13 Signal Ground MicroNTU G 703 X 21 Appendix B Safety Warning and Requirements These warning notices apply to the Input Port the port marked Network Warning The port marked SAFETY WARNING see instructions for use does not provide isolation sufficient to satisfy the requirements of BS6301 apparatus connected directly to this port should either have been approved to BS6301 or have previously been evaluated against British Telecommunications plc Post Office Technical Guides 2 or 26 and given permission to attach Any other usage will invalidate the approval of the MicroNTU Interconnection of the MicroNTU Input Port the port marked N etwork directly or by way of any other apparatus with ports on other apparatus marked or not so marked may produce hazardous conditions on the network Users should seek advice from a competent engineer before such a connection is made The MicroNTU is approved
7. 15 female connector and uses a standard X 21 patch cable wired straight through If you want to construct your own terminal adapter cable refer to Appendix A 4 3 Connection to the Power Source As described in Section 3 3 the MicroNTU G 703 X 21 is available with three power supply options two AC and one DC The two AC power supply options Standard and Universal use a female IEC power cord interface you plug in the power cord that fits your local outlets the cord is supplied with the ee DC power supply option uses a 3 pin terminal strip interface 5 Operation Once the MicroNTU is properly configured and installed it should operate transparently 5 1 Power Up To apply power to the unit first be sure that you ve read Section 3 3 and that the unit has the proper voltage setting and fuse Wrong settings could damage the unit and connected equipment and may constitute a fire hazard Having checked the voltage setting plug the AC power cord into both the MicroNTU and the AC outlet Then power up the unit using the rear Power switch NOTE The PWR LED should glow when power is applied to the unit 5 2 LEDs The MicroNTU features four front panel LEDs that indicate the status of power network connection master clock and loopback test The illustration below shows the front panel location of each LED Following the illustration isadescription of each LED s function Loop Back Q Normal Power Lit red
8. 5 Op ration WS 18 O NN 18 MED laa 18 5 3 Loopback Test LAL 19 Appendix A Pin Configurations 20 Appendix B Safety Warning and Requirement ecseeeseeeeeieteeeeeeee 21 1 Specifications Network Rate Network Interface Network Connectors Terminal Rate Terminal Interface Clocking Receiver Sensitivity Indicators Diagnostics O perating Temperature Relative Humidity Tolerance Maximum Altitude Tolerance Power Size Weight 2 048 Mbps G 703 2 BNC 75 ohm and 1 modular RJ 45 120 ohm 2 04 Mbps 1 024 Mbps 512 Kbps or 256 Kbps X 21 on female DB15 connector Internal Master or Network Recovered Slave clock 10 dB 0 dB 2 4V LEDsfor power network master clock and loopback test Loopback test 32 to 122 F 0 to 50 C 9 to 95 noncondensing Up to 15 000 feet 4572 m 115 or 230 VAC 60 or 50 Hz switch selectable optional universal input call Technical Support 85 to 265 VAC 30 or 60 Hz optional DC input call Technical Support 48 VDC 7 3 H x 6 6 W x 1 6 D 18 5 x 16 8 x 4 1 cm 2 02 Ib 0 9 kg 2 Introduction 2 1 Description The MicroNTU G 703 X 21 is everything you need for connecting to G 703 First asan NTU Network Termination Unit it receives unstructured synchronous 2 048 Mbps data from a G 703 network and sends it to a router bridge multiplexor or other devic
9. U G 703 X 21 is properly configured it s ready to connect to your system 4 1 Connecting to the G 703 Network The MicroNTU G 703 X 21 supports 2 048 Mbps communication over an unstructured G 703 network Both 120 ohm twisted pair and 75 ohm coax interfaces are provided on the rear panel of the unit see the illustration below Be sure the unit is configured properly to operate in either 120 ohm or 75 ohm mode and that the network connection is grounded appropriately see Chapter 3 Network gt rie DTE Interface O m o Ce may o z E x o O OFF 0 4 1 1 TWISTED PAIR 120 0 Hm CONNECTION The MicroNTU G 703 X 21 is equipped with a single RJ 45 jack for connection to a 120 ohm twisted pair G 703 network interface The pinout of this jack is listed below RJ 45 Pins Signal 1 and 2 Receive pair from network 3 Shield reference point 4and5 Transmit pair to network 6 Shield reference point 7 Not used 8 Not used MicroNTU G 703 X 21 4 1 2 Duat Coax BNC 75 OHM CONNECTION In addition to the 120 ohm twisted pair connection the MicroNTU is equipped with dual female BNCs TX and RX for connection to a 75 ohm dual coax G 703 network interface The outer conductor of the coax cables is located from system earth ground 4 2 Connection to the Terminal Device The MicroNTU is wired as a DCE and when configured properly supports communication with an X 21 DTE device The MicroNTU is equipped with a DB
10. ck into the case and replace the screws p Network 8 3 Figure 3 3 O pening the MicroNT U s case MicroNTU G 703 X 21 The internal jumpers mounted on the MicroNTU s PC board labeled LK1 LK7 are used to configure the 75 ohm or 120 ohm network link parameters Figure 3 4 shows the location of the MicroNTU sjumpers on the internal board Figure 3 4 Jumper locations The table below shows the factory default jumper settings Note One combination of jumper settings is required for 75 ohm operation and another combination is required for 120 ohm operation The MicroNTU G 703 X 21 is factory configured for 75 ohm operation MicroNTU G 703 X 21 Jumper Function 75 ohm 120 ohm Factory Default LK1 75 ohm TX Shield to GND On Off On connect LK2 75 ohm RX Shield to GND Opt Off Off disconnect LK3 Reserved Off LK4 120 ohm Shield to GND Off Opt Off disconnect LK5 Configuration Auto Sense On Opt On enabled LK6 75 ohm Input Impedance On Off On LK7 75 ohm Input Impedance On Off 75 ohm Opt optional setting all others are required for proper operation Below are descriptions of each jumper s function and possible settings When configuring the jumpers take care not to lose the individual straps LK1 75 Ohm Transmit Shield to G round Connection This setting determines whether the shiel
11. ct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed theClass A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of the Canadian Department of Communications Lepr sent appareil num iquen m pas de bruits radiodectriques d passant les limites applicables aux apparals num riques de classe A prescrites dans le R glement sur le brouillage radiodectrique publi par le minist re des Communications du Canada MicroNTU G 703 X 21 m N Ww ul fo N 10 NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEM ENT INSTRUCCIONES DE SEGURIDAD Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas Todas las instrucciones de operaci n y uso deben ser seguidas El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de ba o lavabo s tano mojado o cerca de una alberca etc El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante
12. d of the 75 ohm coax transmit cable is connected to earth ground This connection must be made when operating in 75 ohm unbalanced mode Conversely this connection must not be made when operating in 120 ohm balanced mode LK1 Setting Strap On 75 ohm TX Shield to GND Connection Made Strap Off 75 ohm TX Shield to GND Connection Broken LK2 75 Ohm Receive Shield to G round Connection This setting determines whether the shield of the 75 ohm coax receive cable is connected to earth ground This connection is optional when operating in 75 ohm unbalanced mode This connection must not be made when operating in 120 ohm balanced mode LK2 Setting Strap On 75 ohm RX Shield to GND Connection Made Strap O ff 75 ohm RX Shield to GND Connection Broken LK3 DIP Switch S1 1 Enable This strap is reserved for future use and must renain off LK3 Setting Strap On Not a Valid Setting Strap Off Normal Setting MicroNTU G 703 X 21 LK4 120 0 hm Shield to G round Connection This setting determines whether the shield of the 120 ohm modular cable is connected to earth ground This connection is optional when operating in 120 ohm balanced mode This connection must not be made when operating in 75 ohm unbalanced mode LK4 Setting Strap On 120 ohm RX Shield to GND Connection Made Strap O ff 120 ohm RX Shield to GND Connection Broken LK5 Configuration Auto Sense This setting determines whether the host can automatically
13. e Asan interface converter it accepts 120 ohm twisted pair or 75 ohm dual coax network connections both types of interfaces provided Then it converts the signals to an X 21 format on a DB15 connector Asa rate adapter the G 703 X 21 lets a lower bandwidth device 256 Kbps 512 Kbps or 1 024 Mbps connect to a 2 048 Mbps G 703 link The MicroNTU G 703 X 21 supports Internal master or Network slave clocking Loopback test is built in and front panel LEDs monitor power network master clock and test loop Several power supply options are available see the Power specifications in Chapter 1 2 2 Features Synchronous network data rate of 2 048 Mbps 4 selectable terminal rates 256 or 512 Kbps 1 024 or 2 048 Mbps e Supports X 21 terminal interfaces on a DB15 connector Both 75 ohm BNC and 120 ohm modular network terminations e Selectable Internal master or Network slave clocking e Loopback test modes Front panel LED indicators for power network master clock and test loop 3 Configuration The MicroNTU G 703 X 21 is equipped with one DIP set containing eight switches externally accessible as well as seven jumpers internal These switches and jumpers allow configuration of clocking data rate and test options The G 703 X 21 is also equipped with an internal switch that allows selection of 115 or 230 VAC power inputs Note This switch is not present in models with the optional universal p
14. off 2 048 M bps On off 1 024 M bps off On 512 Kbps On On 256 Kbps S1 4 Loopback T est Enable Depending upon the setting of switch S1 4 the MicroNTU will either be continually in loopback mode or loopback mode will be enabled by pressing and holding the front panel switch Since the front panel switch is spring loaded it returns to the Normal operation when pressure is released this DIP switch provides a way of leaving the MicroNTU in unattended loopback mode for remote test purposes 14 Setting On Continual unattended loopback mode Off Loopback activation by front panel switch MicroNTU G 703 X 21 S1 5 Data Inversion The setting for switch S1 5 determines whether or not the data stream from the local DTE isinverted within the MicroNTU before being passed to the G 703 network The ability to invert the data stream may be necessary when the MicroNTU is being used with an embedded G 703 device that inverts the data on the remote end Normally data inversion is not necessary 15 Setting On Data inverted Off Data not inverted S1 6 S1 7 and S1 8 Not Used 3 2 Internal Jumper Settings The MicroNTU s seven jumpers are located on the PC board inside the unit To access the jumpers 1 Turn the power switch off 2 Remove the power cord from the unit 3 Remove the two screws on the rear panel and slide the board out from the rear see Figure 3 3 on the next page 4 Slide the PC board ba
15. ower input This section describes switch and jumper locations and explains all possible configurations 3 1 External DIP Switch Settings The DIP switch set is located on the underside of the unit see Figure 3 1 Figure 3 2 shows the switch s orientation All possible settings for the MicroNTU s switches are presented in the summary table and descriptions on the next page S1 ell q Figure 3 1 The 8 position DIP switch located on the box s underside ON TR 34567 8 OFF ON Figure 3 2 Configuration of the DIP switches The configuration switches on S1 set clocking rate adaptation loopback enable and data invert The default settings are summarized in the table below MicroNTU G 703 X 21 Position Function Factory Default S1 1 Clock Master Slave On Master 1 2 Rate Adaptation Off 2 048 Mbps when both 1 3 Rate Adaptation Off S1 2 and S1 3 are OFF S1 4 Test Enable Off Front Panel S1 5 Data Inversion Off Not Inverted S1 6 Not Used Off N A S1 7 Not Used Off N A S1 8 Not Used Off N A S1 1 M aster Slave Clock The setting for switch S1 1 determines whether the MicroNTU providesthe master clock or is slaved to another clock source S1 1 Setting On MicroNTU is master Off MicroNTU is slave S1 2 and S1 3 Rate Adaptation S1 2 S1 3 Setting off
16. when the unit is powered up N etwork Lit green when the unit is receiving correctly encoded data from the line interface equipment Master Clock Lit green when the unit is receiving correctly encoded data from the line interface equipment Loop Lit green when the unit isin loopback mode MicroNTU G 703 X 21 5 3 Loopback Test LAL The MicroNTU G 703 X 21 is equipped with a Local Analog Loopback LAL mode to assist in evaluating the operation of the local MicroNTU G 703 X 21 Any data sent to the local MicroNTU G 703 X 21 in this test mode will be echoed back returned to the user device For example characters typed on the keyboard of a terminal will appear on the terminal screen To perform an LAL test 1 Activate LAL by moving the front panel toggle switch UP and holding it in the Loopback mode The Loop LED should glow Once LAL is activated the MicroNTU G 703 X 21 transmit output is connected to its own receiver NOTE The front panel switch is spring loaded so it will return to Normal operating mode when pressure is released To put the MicroNTU in continual loopback mode for the purpose of performing a BER test move DIP switch S1 4 to the ON position see Section 3 1 N lt Verify that the data terminal equipment is operating properly and can be used for a test If a fault isindicated call Technical Support at 412 746 5500 Uy Perform a BER bit error rate test on each
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