Black Box MX870A User Manual
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Black Box MX870A User Manual

Black Box MX870A User Manual

Miniature 2-channel statistical multiplexor
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JULY 1998
MX870A
MX870AE
Miniature 2-Channel Statistical
Multiplexor
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

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  • Page 1 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...
  • Page 2 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR FEDERAL COMMUNICATIONS COMMISSION CANADIAN DEPARTMENT OF COMMUNICATIONS 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.
  • Page 3 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 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.
  • Page 4 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 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.
  • Page 5 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR TRADEMARKS The trademarks mentioned in this manual are the sole property of their owners.

  • Page 6: Table Of Contents

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Contents Chapter Page 1. Specifications............8 1.1 General.
  • Page 7 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Contents (continued) Chapter Page 4.17 Parity Screen ..........31 4.18 Stop Bits Screen.
  • Page 8 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Contents (continued) Chapter Page 6. Diagnostics............48 6.1 General.

  • Page 9: Specifications

    Indicators (LEDs)—(1) SYNC for main channel, (2) DATA LEDs (one for each sub-channel), (1) POWER, (1) OVF, (1) TEST, (1) RESET Power—MX870A: 115 VAC; MX870AE: 230 VAC; 47 to 63 Hz; 5 VDC, 700 mA, regulated Temperature—32 to 122°F (0 to 50°C) Humidity—Up to 95%, noncondensing...

  • Page 10: Composite Channel

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 1.3 Composite Channel Configuration—DTE Transmission Format—Synchronous, external timing Data Rate—Up to 19.2 kbps Connector—(1) DB25 female Control Signals—RTS, CTS, DCD, DTE, analog loopback (pin 18), remote digital loopback or signal quality (pin 21) Protocol—Proprietary variant of HDLC framing protocol as defined in CCITT X.25 level 2...

  • Page 11: Quick-Start Guide

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 2. Quick-Start Guide 2.1 Scope This guide provides concise instructions for configuring your Miniature 2-Channel Statistical Multiplexor. Use it if you’re already familiar with the Multiplexor, or if you’re an experienced user and have a good basic understanding of data- communication principles and know the applications and characteristics of statistical multiplexors.

  • Page 12: Configuration Instructions

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 2.3 Configuration Instructions Pay attention to use of capital letters whenever required. 1 . If necessary, power up the Multiplexor and connect your terminal to one of the sub-channels. Check terminal communication parameters. 2. Allow an idle period of at least one second, type @ @ @, wait at least one second, and type S.

  • Page 13: Introduction

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 3. Introduction 3.1 Functional Description The Miniature 2-Channel Statistical Multiplexor is an advanced, full function and compact statistical multiplexor. The Multiplexor multiplexes two asynchronous data sub-channels, at data rates of 300 to 19,200 bps onto a single composite synchronous channel of up to 19.2 kbps.

  • Page 14: Typical Application

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 3.2 Typical Application Figure 3-1 shows a typical Multiplexor application. In this application, the Multiplexor sub-channels receive data provided by the host computer via channels operating at various rates, and statistically multiplexes the sub-channel data to form a composite data stream having a rate much smaller than the arithmetical sum of the individual sub-channel rates.

  • Page 15: Installation

    OWER The Multiplexor is powered by an external power supply of 5 VDC/700 mA. A 115-VAC power supply is included with the MX870A model and a 230-VAC power supply is included with the MX870AE model. The power supply is connected to the Multiplexor by a cable ending in a miniature phone jack (tip positive, sleeve–ground).
  • Page 16 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR INIT - Initialization. The Multiplexor uses the default configuration (determined by the factory and common to all Multiplexor units). To select the default configuration, set the jumper to INIT, then apply power to Multiplexor. The default configuration is loaded upon power-up (factory setting is NOR).
  • Page 17 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR PIN 21 OFF Set the jumper to this position when the modem uses pin 21 as a signal- and quality-indication output. You should also use this position whenever in doubt about the actual function of the pin in the specific modem model you use. In this position, you no longer have control of the modem remote loopback function from the diagnostics screen.

  • Page 18: Cable Connections

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.4 Cable Connections 4.4.1 G ENERAL The Multiplexor has one standard DB25 connector, serving the main channel, and two RJ-45 connectors for the sub-channels. 4.4.2 S CHANNEL ONNECTIONS Multiplexor sub-channel interfaces are configured as data communication equipment (DCE) interfaces, thereby allowing direct connection, via RS-232 port cables, to data terminal equipment (DTE).
  • Page 19 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR • Parameter-selection functions. • System management functions, used to save (store) selected parameters, transfer configurations between the local and remote units, activate new configurations, and select passwords. 3. Diagnostics mode Multiplexor diagnostic functions include local and remote loops on each sub-channel and on the composite channel, and modem loops (analog and optionally remote digital loopback).
  • Page 20 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 4-1. System Parameters and Factory Settings. No. Parameter Function Available Factory Selections Setting PASSWORD Controls access Any two characters RD (capital to configuration except those used letters) as X-ON and X-OFF control characters X-ON CONTROL When using software 11H (DC1) CHARACTER flow control, causes...
  • Page 21 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 4-2. Sub-Channel Parameters and Factory Settings. No. Parameter Function Available Factory Selections Setting BAUD RATE Sub-channel data 300, 600, 1200, 1800, 9600 rate 2400, 4800, 7200, 9600, 14400, and 19200 bps DATA BITS Number of data bits in 5, 6, 7, 8 sub-channel data frame PARITY...

  • Page 22: Starting The Configuration Session

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.7 Starting the Configuration Session The rest of this chapter explains in detail how to configure the Multiplexor. If you are already acquainted with the Multiplexor, a Quick-Start Guide is given in Chapter 2. 4.7.1 U SING THE ONFIGURATION ROGRAM...

  • Page 23: Starting The Configuration Program

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR However, configuration can usually be done without connection to the remote Multiplexor. There is one exception to this rule: you must establish communication with the remote Multiplexor if you set the RTS-to-DCD control passing to ON (screen 14), and your command terminal requires DCD active in order to communicate.
  • Page 24 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 3. Enter the password, carefully observing the correct use of upper and lowercase characters. The password is not echoed to the screen. Factory setting is RD. 4. If the password is rejected, you will see the following screen appear : COMMAND MODE IS ACTIVATED VIA CH1 WRONG PASSWORD MULTIPLEXOR IS IN NORMAL MODE...

  • Page 25: Configuration Procedure

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.8 Configuration Procedure The rest of this chapter presents the menus and the data-entry screens contained in the configuration program. These paragraphs describe menu and screen purpose, explain how to fill the desired data, and present any supplementary information that may be required. Table 4-3 lists the available menus and screens, their index numbers and the page on which you will find each screen.

  • Page 26: Main Menu

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 4-3 (continued). Multiplexor Configuration Program. Index Menu/Data Entry Screen Page SAVE IN LOCAL MULTIPLEXOR Screen TRANSFER CONFIGURATION FROM LOCAL TO REMOTE Screen PREPARE REMOTE MULTIPLEXOR CONFIGURATION Menu REMOTE Multiplexor SYSTEM CONFIGURATION Menu REMOTE SUB-CHANNEL 1,2 SYSTEM CONFIGURATION Screens ACTIVATE REMOTE Multiplexor CONFIGURATION Screen...

  • Page 27: System Configuration Menu

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 4-4 (continued). Description of the Main Menu. Code Item Description SUB-CHANNEL 1 These two items are used to CONFIGURATION select local sub-channel parameters of the command sub-channel as the last item SUB-CHANNEL 2 Always change the parameters CONFIGURATION of the command sub-channel as the last item...

  • Page 28: X-On Control Character Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 4-5. System Configuration Parameters. Code Item Description X-ON CONTROL CHARACTER Used to display X-ON character selection screen X-OFF CONTROL CHARACTER Used to display X-OFF character selection screen MODIFY PASSWORD Used to display password- changing screen REMOTE MUX CONFIGURATION Used to display the main menu used for remote Multiplexor configuration...

  • Page 29: X-Off Control Character Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.12 X-OFF Control Character Screen View the character currently used to stop data transfer when using software flow control, and select another character. Code numbers 1) through 8) present the various characters that can be used as X-OFF control characters: 11 (DC 1), 12H (DC2), 13H (DC3), 14H (DC4), 91 H, 92H, 93H, or 94H.

  • Page 30: Sub-Channel 1/2 Configuration Screens

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR INCORRECT VERIFICATION, PASSWORD HAS NOT BEEN CHANGED ENTER NEW PASSWORD (two characters) OR PRESS Q TO EXIT You can now repeat the procedure, or quit. 4.14 Sub-Channel 1/2 Configuration Screens Select and view the current values of the parameters of the sub-channel whose number appears in the screen header, and enter the corresponding sub-channel parameter configuration screens when changes are needed.

  • Page 31: Data Bits Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Code numbers 1 through 9 list the available sub-channel rates; 19200, 14400, 9600, 7200, 4800, 2400, 1200, 600, and 300 bps. Code Q is used to return to the SUB-CHANNEL CONFIGURATION screen. The CURRENT STATE line shows the current sub-channel rate. To change sub-channel rate, type the appropriate code number.

  • Page 32: Parity Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.17 Parity Screen View current parity used by the sub-channel and select, if desired, a new type. Code numbers 1 through 3 list the available parity types: odd, even or none. Code Q is used to return to the SUB-CHANNEL CONFIGURATION screen. The CURRENT STATE line shows the current type of parity.

  • Page 33: Multiplexor To Dte Software Flow Control Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.19 Multiplexor to DTE Software Flow Control Screen View the current status of end-to-end software flow control used on this sub- channel and select, if desired, a new status. The Multiplexor must be able to command the DTE connected to it to interrupt the flow of data when Multiplexor buffers fill, and restart the flow when the Multiplexor can accept new data for transmission.

  • Page 34: End-To-End Software Flow Control Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.20 End-to-End Software Flow Control Screen View the current status of end-to-end software flow control used on this sub- channel and select, if desired, a new status. In addition to the STM-to-DTE control function (Section 4.19), the Multiplexor provides a DTE-to-DTE (or “end-to-end”) flow-control function.

  • Page 35: End-To-End Dtr Flow Control Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR To change the status of end-to-end software flow control used on this sub- channel, type the appropriate code number. The new selection appears in the CURRENT STATE line. Type Q to return to the SUB-CHANNEL CONFIGURATION screen. 4.21 End-to-End DTR Flow Control Screen View the current status of end-to-end hardware flow control (via the DTR line) used on this sub-channel and select, if desired, a new status.

  • Page 36: Rts Control Pass Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.22 RTS Control Pass Screen View the current status of the RTS-to-DCD control function used on this sub- channel, and select, if desired, a new status. The Multiplexor stand-alone and card models can transfer end-to-end (in both directions) one RS-232 interface control signal per channel;...

  • Page 37: Local Loops Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Code Q is used to retum to the MAIN MENU screen. When you first enter the DIAGNOSTICS menu, the CURRENT STATE line shows: ALL TESTS IN THE OFF STATE. Type the code number corresponding to the desired test loop type. Type Q to retum to the MAIN MENU screen.

  • Page 38: Modem Loops Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR NOTE Remote digital loopback is performed by toggling pin 21 to the modem connected to the local Multiplexor. This forces the modem to transmit a command to the remote modem. Before attempting to perform loopback, make sure that: 1.

  • Page 39: Transfer Configuration From Remote To Local Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 4-6. Remote Configuration Menu Items. Code Item Description TRANSFER Used to initiate transfer of current remote Multiplexor CONFIGURATION configuration to the local Multiplexor. After remote FROM REMOTE TO configuration is received by the local Mux, it can be LOCAL examined using the terminal connected to the local Mux.

  • Page 40: Remote Multiplexor Configuration Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR In most cases, the screen is displayed for a very short interval; however, under certain traffic conditions, the user may become aware of the transmission delay, so this screen is used to notify that the required action is being cried out: TRANSFER CONFIGURATION FROM REMOTE TO LOCAL WAIT FOR SAVING ACKNOWLEDGE If you want to exit, press Q.

  • Page 41: Examine Remote Multiplexor Configuration Screen

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.31 Examine Remote Multiplexor Configuration Screen Displays the information regarding remote Multiplexor configuration, received by selecting item 1 on the REMOTE MULTIPLEXOR CONFIGURATION menu. The screen displays the parameters selected for the remote Multiplexor sub- channels. No action is required on this screen.

  • Page 42: Prepare Remote Multiplexor Configuration Menu

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR In most cases, the screen is displayed for a very short interval; however, under certain traffic conditions, the user may become aware of the transmission delay, so this screen is used to notify that the required action is being carried out: TRANSFER CONFIGURATION FROM LOCAL TO REMOTE WAIT FOR SAVING ACKNOWLEDGE If you want to exit, press Q.

  • Page 43: Remote Sub-Channel 1, 2, Configuration Screens

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 4.36 Remote Sub-Channel 1, 2, Configuration View and select the current parameter values of remote Multiplexor sub-channels. Configuration screens are identical to the sub-channel 1 configuration screen described in Section 4.14. The only difference is in the identification of the sub- channel displayed on the screen.

  • Page 44: Operating Instructions

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 5. Operating Instructions 5.1 Controls, Indicators, and Connectors Table 5-1 lists the functions of the Multiplexor indicators and connectors. The numbers under the heading “Item” refer to the identification numbers in Figure 5-1. POWER SYNC DATA TEST RESET Figure 5-1.
  • Page 45 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 5-1. Multiplexor Controls, Indicators, and Connectors. Item Control, Indicator, or Connector Function Condition Indication Flashing Mux powered, but not (Continuous) synchronized with remote Mux Flashing Mux retransmits data (Intermittent) frame upon request of remote Mux (usually because a noisy line causes errors in the data...

  • Page 46: Operating Instructions

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 5.2 Operating Instructions 5.2.1 G ENERAL After being prepared for operation as explained in Sections 4.3 through 4.7, the Multiplexor normally operates unattended. Operator intervention is only required when the Multiplexor is setup for the first time or must be adapted to new operational requirements.

  • Page 47: What To Do In Case Of Malfunction

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 5.3 What to Do in Case of Malfunction 5.3.1 P RELIMINARY CTIONS Here is a list of actions that will help you return to normal operation in case a problem occurs. Additional information on Multiplexor diagnostics appears in Chapter 6.

  • Page 48: Configuration

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table 5-2. Multiplexor Indications. Indication Probable Cause Action OVF lights Mux buffers full One of the DTE units connected to the Mux does not respond to flow control commands; check that all the DTEs do have a flow control option, and the Mux flow control is properly configured.

  • Page 49: Diagnostics

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 6. Diagnostics 6.1 General Multiplexor diagnostics functions use test loops and indicators to provide the user with the tools required for rapid identification of faults that affect system operation. The test loops available for diagnostics and test purposes are: a.

  • Page 50: Description Of Test Loops

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 6.2 Description of Test Loops Whenever a test loop is on, the TEST indicator will light and traffic will be disrupted. 6.2.1 L OCAL OOPS (1) Local composite channel loop When the local composite channel loop is connected, the composite channel data transmitted by the local Multiplexor is applied to the receive line of the local Multiplexor, and the communication link is disconnected (this causes the remote Multiplexor to lose frame synchronization).

  • Page 51: Remote Loops

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR 6.2.2 R EMOTE OOPS (1) Remote composite channel loop When the remote composite channel loop is connected, the composite channel data transmitted by the local Multiplexor is returned from the remote Multiplexor after regeneration but without any other processing. Any data transmitted from theremote Multiplexor sub-channels is lost during loop connection.

  • Page 52: Modem Loops

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR performed satisfactorily on the local sub-channel loop, usually indicates a problem in the remote Multiplexor. 6.2.3 M ODEM OOPS (1) Analog modem loop When the analog modem loop is connected, the composite channel data transmitted by the local Multiplexor is returned to the receive line of the local Multiplexor after passing through the local modem, and the communication link is disconnected.

  • Page 53: Appendix A: Functional Interface Specifications

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Appendix A: Functional Interface Specifications A.1 Main (Composite) Channel Interface Table A-1. Main (Composite) Channel Connector. CCITT EIA Pin Signal Name Description V.24 Circuit 232C Number Line AA 1 Protective Ground Chassis ground (may be isolated from signal ground or connected to it—refer to Section 4.3) AB 7...

  • Page 54: Sub-Channel Interface

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table A-1. Main (Composite) Channel Connector. CCITT EIA Pin Signal Name Description V.24 Circuit 232C Number Line CD 20 Data Terminal Ready Remains positive for a period of 20 seconds then drops to a negative level for approximately 1 second and returns to the positive level for another 20 seconds continuously until...
  • Page 55 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Table A-2. Sub-Channel Connector. CCITT EIA Pin Signal Name Description V.24 Circuit 232C Number Line AA 1 Protective Ground Chassis ground (may be isolated from signal ground or connected to it; refer to Section 4.3. AB 7 Signal Ground Common signal and DC power-supply ground.
  • Page 56 MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Sub-channel connection cables depend on application: a port (“straight- through”) cable is generally used to connect the Mux to a DTE, and a modem (“crossover”) cable is used to connect the Mux to a tail-end modem (see Figure A-1).

  • Page 57: Appendix B: Configuration Record

    MINIATURE 2-CHANNEL STATISTICAL MULTIPLEXOR Appendix B: Configuration Record This appendix presents a typical configuration record form, which you can use as a worksheet during configuration planning, and as a permanent record of the actual configuration. Multiplexor Configuration Form Date:___________________ Prepared by:____________________ Location:_______________ Far Location:____________________ Multiplexor Serial No.
  • Page 58 © Copyright 1998. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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