Digi-Mux HS
Contents
1. BLACK BOX Digi Mux HS FEBRUARY 1996 MX700A 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 FCC STATEMENT 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 It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart B 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 correct 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 the Class A limits for2. The clocks of sub channel 4 are not the regular clocks because the synchronization bit produces one missing clock during transmit or receive periods of the bit For sub channel 4 clocks there are 2 options for equipment sensitive to discontinuity in the clock phase missing clock in the regular clock cycle Option 1 Without smoothing The clocks are the nominal clocks while every 2048 clocks a missing clock occurs Option 2 With smoothing The clocks will be set with 50 duty cycle and will not be the nominal clocks The missing clock period is evenly spread over the other clocks CHAPTER 2 Introduction 2 2 4 DIAGNOSTICS To activate the Digi Mux HS s local main loop press the front panel push button The Digi Mux HS provides continuous LED monitoring of transmit and receive data for each channel and link as well as receive Data Carrier Detect and Synchronization loss of the link 2 2 5 DCE DTE SELECTION With jumpers you can set Channels 1 2 and 3 independently to operate as DCE or DTE so you can directly connect tail end circuits to to the Digi Mux HS without a cross cable Whenever a channel is set as DTE an elastic buffer is automatically activated Time Division Time Multiplexor Division Multiplexor Up to ids 2 048 bps 2g Nux CSU DSU CSU DSU Figure 2 1 Remote Units Linked to Central Communication Controller 3 Ins
3. Generali eene tese hee ivo ERR P Ea 16 4 2 CONTON zu eccentric ettet eee 17 4 3 Indicators unir etn cde rede Lin dire m 17 4 4 Operating Procedure rente torpe 19 44 1 Power Ont nine het tr ere ttes ein terne den 19 44 2 2t o tote tempted tiis 19 4 4 5 OP TAUON 19 44 4 Power OL eene tette tke e tet ee RM a e ER Praten 19 4 5 Re confiBUFilg see ettet e or ne ta een made ere en 19 UNE IM 20 1 Specifications Multiplexor Technique Time division interleaved Protocol Synchronous Speed Link Up to 2 048 Mbps with no bit timing on Channel 4 selectable rates up to 2 048 Mbps Channel A 25 split per channel a 50 25 25 split between channels 1 2 and 4 a 50 50 split between channels 1 and 4 a 75 25 split between channels 1 and 4 Interface V 35 Connectors 5 V 35 34 pin female Indicators Channels Transmit TD Receive RD Link Transmit TD Receive RD Data Carrier Detect Synchronization Loss TEST Configuration Link D TE externally clocked Link Channels 1 2 and 3 DCE or DTE Channel 4 DCE only Diagnostics Local loop Temperature 32 to 122 F 0 to 50 C Humidity U p to 90 non condensing Power 115 230 VAC 42 to 63 Hz 10 watts Size 1 7 H x 17 W x 8 2 D 4 83 x 43 2 x 20 8 cm Weight 4 4 1b 2 kg 2 Introduction 2 1 General Description The Digi Mux HS is a high speed bit interleaved time division multiplexor enabling up t
4. RD Flashing Main channel DCD ON SYNC LOSS OFF e TEST OFF 4 4 2 SELF TEST To verify that the Digi Mux HS is operating correctly use the local loopback test as described in Chapter 5 4 4 3 OPERATION The Digi Mux HS operates entirely unattended except for occasional monitoring of the front panel 4 4 4 POWER OFF To power off the Digi Mux HS simply switch the power button on the rear panel of the Digi Mux HS to the OFF position 4 5 Reconfiguring If you must reconfigure the Digi Mux HS for a different type of operation you must change the jumpers to correspond to the new operating mode See Section 3 4 4 EDIGEMUX HS 5 Testing This chapter explains how to use the loopback test The test switch and front panel indicators built into the Digi Mux HS allow rapid checking of the Digi Mux HS Use the test procedure provided in this chapter to verify normal operation and to isolate faulty equipment in the event of failure Before testing the operation of data system equipment circuits make sure that all units are turned on and configured correctly The test checks the performance of the local multiplexor the local equipment attached to the multiplexor and the cables between them It is performed separately at the local and the remote sites PROCEDURES 1 Press the LOCAL LOOP button on the front panel The TEST indicator should turn on The Digi Mux HS s transmit output is now connected to its own recei
5. Main Channel Selects main Off Option 1 multiple of 64 bps Data Rate channel data On Option 2 multiple of 56 bps Off Option SW2 4 rate option for No 1 above CON setting connects Signal Ground to Chassis Ground DIS setting isolates them CHAPTER 3 Installation Table 3 2 continued Digi Mux HS Strap Selection Strap Identity Function Possible Settings Factory Setting No 4 Selects equipment DTE for DTE equipment DTE DCE connected to DCE for DCE equipment sub channel 1 No 5 Selects equipment DTE for DTE equipment DTE DCE connected to DCE for DCE equipment sub channel 2 No 6 Selects equipment DTE for DTE equipment DTE DCE connected to DCE for DCE equipment sub channel 3 EDIGEMUX HS ee 4 Operation 4 1 General This chapter describes the functions of the controls and indicators and provides operating instructions and strapping information You must complete and check the installation as described in Chapter 3 before you operate the Digi Mux HS LOCAL 14 pH 3 pH MAN SYNC LOOP POWER TD RD TD RD TD RD TD RD TD RD DCD Loss Figure 4 1 Digi Mux HS Front Panel CHAPTER 4 Operation 4 2 Control The Local Loop button located on the front panel performs a loop on the main channel towards the sub channels When activated it loops the transmit main channel data and clock to its receive data and clock 4 3 Indicators All LED indicators are located on the front pane
6. Mux HS after receiving RTS Data Set Ready A positive level from the Digi Mux HS when power is on Data Terminal Not used Ready Carrier Detect F DCD 109 A positive level from the Digi Mux HS CHAPTER 3 Installation Table 3 1 continued Interface Signal List female connector Signal Function Pin Circuit Description External Transmit U SCTE A 113 A serial data rate clock input from the Clock W SCTE B 113 data source Positive clock transition must correspond to data transition Transmit Clock Y SCT A A transmit data rate clock output for use a SCT B by external data sink Positive clock transition corresponds to data transition Receive Clock A receive data rate clock output for use by external data sink Positive clock transition corresponds to data transition Table 3 2 Digi Mux HS Strap Selection Strap Identity Function Possible Settings Factory Setting No 1 Selects the main Option 1 Option 2 Main Channel channel data rate SW2 4 OFF SW2 4 ON Data Rate for channel 4 2048 1792 kbps smoothing clocks 1024 896 512 448 256 224 256 kbps 128 112 64 56 No 2 Selects main Switch Sub channel Channel Split splitbetweenthe 1 2 123 4 SW2 1 SW2 2 sub channels On On 25 25 25 25 25 25 25 25 measured as On Off 5025 25 a percentage Off On 50 50 Off Off 75 25 Smoothing Selects sub On Smoothing clock 50 duty cycle SW2 3 channel 4 s Off Without smoothing clock Off clock
7. similar bit from the remote Digi Mux HS before advancing to step 3 NOTE As long as the Digi Mux HS receives a synchronization bit every 4096 bits it remains in stage 2 Stage 3 Full synchronization state The Digi Mux HS transmits and receives a synchronization bit every 2048 bits If it doesn t receive a synchronization bit at this value the unit is out of synchronization and it stops transmitting to the remote Digi Mux HS over a long period of time causing the remote to exit its synchronization state Both Digi Mux HSs then revert to stage 1 The synchronization bit in the main channel is transmitted and received in the timeslot of channel 4 To stop the data stream during this time period the Digi Mux HS does not send clocks on channel 4 2 2 3 TIMING The Digi Mux HS link rate can be up to 2048 kbps and is externally clocked from the modem or the Digital Data Service line Channel rate is determined as a percentage of the link rate The Digi Mux HS supports four modes 1 Each channel is allocated 25 of the link rate 2 Channel 1 is allocated 50 and channels 2 and 4 are each allocated 25 of the link rate 3 Channel 1 and channel 4 are each allocated 50 of the link rate 4 Channel 1 is allocated 75 of the link rate and channel 4 is allocated 25 of the link rate The clocks to the sub channels are a division of the main channel clocks with the division determined according to the mode of operation
8. l and described in Table 4 1 The numbers listed under Item in Table 41 correspond to the identification numbers in Figure 4 1 Table 4 1 Indicators Item Indicator LED Color Function POWER Green ON when power is on CH 1 thru Yellow ON when steady space is transmitted in CH 4 TD sub channel Flickers when data is transmitted CH 1 thru Yellow ON when steady space is received in CH 4 RD sub channel Flickers when data is received MAIN TD ON when steady space is transmitted in main channel Flickers when data is transmitted MAIN RD ON when steady space is received in main channel Flickers when data is received MAIN DCD Yellow ON when a DCD signal is received from the main channel modem SYNCLOSS Red ON when Digi Mux HS does not receive a synchronization bit from the remote Digi Mux HS ON when Digi Mux HS is in loopback CHAPTER 4 Operation 4 4 Operating Procedure 4 4 1 POWER ON Apply AC power by connecting the AC power cord to an acceptable AC source and place the power button on the rear panel in the ON position The power LED should light up indicating that the Digi Mux HS is on If the local and remote Digi Mux HS units are connected to modems and all these units are operating and passing data the following indicator conditions should exist POWER ON All sub channels TD Flashing or OFF All sub channels RD Flashing or OFF Main channel TD Flashing Main channel
9. o four channels to be multiplexed onto the trunk line of a Digital Data Service or modem It can multiplex two three or four channels onto one link without overhead For example four data sources such as computers controllers or multiplexors operating at a data rate of 64 kbps can share a single modem or DDS link at a data rate of 256 kbps The Digi Mux HS provides full duplex synchronous operation at selected data rates up to 2048 kbps 2 2 Functional Description and Applications 2 2 1 MULTIPLEXING The Digi Mux HS selects one data bit from each active channel and serially transmits the combined data stream over the high speed link At the receive end it reverses the procedure allocating each data bit to its respective channel 2 2 2 SYNCHRONIZATION The Digi Mux HS uses one bit in every 2048 bits on the main link to synchronize the data while it takes bit time from channel 4 bandwidth Though this does not result in loss of data it does prevent connection of a tail end circuit or DTE equipment that cannot tolerate clock phase discontinuity to channel 4 e g other TDM multiplexors Synchronization occurs in 3 stages Stage 1 The Digi Mux HS sends a synchronization bit every 4096 bits and waits to receive a similar bit from the remote Digi Mux HS within every 4096 bits After receiving a synchronization bit it advances to the next step Stage 2 The Digi Mux HS sends a synchronization bit every 2048 bits and waits to receive a
10. radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appareils num riques de la classe A prescrites dans le Reglement sur le brouillage radio lectrique publi par Industrie Canada NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1 Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado 2 Las instrucciones de seguridad y operaci n deber n ser guardadas para referencia futura 3 Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas 4 Todas las instrucciones de operaci n y uso deben ser seguidas 5 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 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio calificado 9 El aparato el ct
11. rico 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 10 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 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 NOM STATEMENT 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 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
12. tallation 3 1 General This chapter provides information on the mechanical and electrical installation of the Digi Mux HS To ensure normal operation after installation refer to Chapter 4 for operating information and system checkout 3 2 Preparing the Site The Digi Mux HS should be installed within 5 feet 1 5 m of a grounded easily accessible AC outlet The outlet should be capable of furnishing 115 VAC or 220 VAC depending on the power voltage available in your area Allow at least 36 in 90 cm of frontal clearance for operating and maintenance accessibility Ensure that there is at least 4 in 10 cm clearance at the rear of the unit for signal lines and interface cables 3 3 Mechanical Assembly The Digi Mux HS is designed to be placed on a tabletop or bench and is delivered completely assembled You cannot bolt the Digi Mux HS to the tabletop 3 4 Electrical Installation 3 4 1 AC POWER CORD AC power is supplied to the Digi Mux HS through a standard 5 foot 1 5 m detachable power cord terminated by a standard 3 prong plug The power inlet on the rear panel incorporates an integral fuse 3 4 2 REAR PANEL CONNECTORS The main and sub channels consist of five 34 pin V 35 interface connectors Table 3 1 provides detailed information on these interface connectors 3 4 3 STRAP SELECTION After you complete and check the electrical installation determine the configuration of the Digi Mux HS in the data system and posi
13. tion the straps as required The strap locations noted on the PCB Layout Diagram Figure 3 1 correspond to the numbers listed under Strap Identity in Table 3 2 CHAPTER 3 Installation DCE DTE DCE DTE CHSIS GND e E 9 O 4 SMOOTHING CHANNEL SPLIT MAIN BAUD RATE sw2 CHANNEL SW2 4 OFF ON 1 2 1234 0 2048 0 1729 ON ON 25 25 25 25 1 1024 1 896 25 SW2 7 2 512 2 448 50 la en 3 256 3 224 OFF OFF 75 25 O 4 129 4 112 1234 Sel 5 64 5 56 Figure 3 1 PCB Layout 3 4 4 CHANGING INTERNAL JUMPERS AND SWITCHES 1 Disconnect the power cable 2 Loosen the rear screw holding the top cover in place 3 Remove the top cover 4 Adjust the jumpers as required 5 Replace the top cover and tighten the retaining screw Table 3 1 Interface Signal List female connector Signal Function Pin Circuit Description Protective Ground A Frame 1 Chassis ground May be isolated from signal ground refer to Table 3 2 Common signal and DC power supply ground Transmitted Data Serial digital data from DTE The data transition must occur on the rising edge of the transmit clock Received Data Serial digital data to DTE The data transition must occur on the rising edge of the receive clock Request to Send A positive level to the Digi Mux HS when data transmission is desired Clear to Send A positive level from the Digi
14. ve Figure 5 1 2 Verify that the equipment attached to the Digi Mux HS is operating properly and can be used for test If a fault is indicated call a technician or replace the unit 3 Execute the test using one of the methods described below a Use the equipment and check the echoed stream b Use an external Bit Error Rate Tester BERT unit 4 Perform step 3 above at both ends If BERT test equipment indicates no fault but the regular equipment does indicate a fault follow the manufacturer s test procedures for the equipment and verify that the cable connecting the Digi Mux HS and the equipment is properly connected and in good condition After completing the test or when the fault has been corrected press the LOCAL LOOP button again The TEST LED should be OFF CHAPTER 5 Testing DTE DCE DTE DCE DTE DCE Loopback Digi Mux HS Figure 5 1 Digi Mux HS in Local Loop BLACK BOX Copyright 1996 Black Box Corporation All rights reserved 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746
15. 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 TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners CONTENTS Contents Chapter Page Y Specifications 6 2 Introduction cd 7 2 1 General Description eme ceder ten 7 2 2 Functional Description and Applications sese 7 2 21 Mult plexing sento cree em ee beng sass dina 7 2 2 2 Syn Chromzatioti eode ene che odo er Soak eds 7 25259 O TN 8 2 2 4 DIAN 0 EET A AAEE ETE 9 2 2 5 DCE DTE Selecto titanio 9 3 Installation xc oett e sent 10 Bed GEE Lal vin rue patte perte i e a EA Et dte dee Ta ents sue 10 35 2 Preparing tlie Site eruere nene AA 10 3 3 MechanicalLAssembbly 10 3 4 Electrical een enne 10 BAL AG Power CON uentrem 10 3 4 2 Rear Panel Connectors ss 10 e SN A AAA oen mieten 10 3 4 4 Changing Internal Jumpers and Switches 11 4 ceste sin EU tite eate doit ide 16 A
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