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Black Box MX270A Manual

Black Box MX270A Manual

Data voice multiplexor
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Data Voice Multiplexors
CUSTOMER
SUPPORT
INFORMATION
S Y N C
L O S S
T E S T
P W R
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
MX270A MX270AE
MX271A MX271AE
MX272A MX272AE
MX273A MX273AE
MX274A MX274AE
MX275A MX275AE
MX276A MX276AE
MX277A MX277AE
V O I C
D A T A
P A T T
D
L
V
R )
R D ( E
T D
AUGUST 1998
E X O R
L T I P L
E M U
R L B

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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 FCC STATEMENTS FEDERAL COMMUNICATIONS COMMISSION 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...
  • Page 3 DATA VOICE MULTIPLEXORS 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 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.
  • Page 5 DATA VOICE MULTIPLEXORS TELECOMMUNICATION SAFETY STATEMENTS Always observe standard safety precautions during installation, operation, and maintenance of this product. Only qualified and authorized service personnel should carry out adjustment, maintenance, or repairs to this instrument. No adjustment, maintenance, or repairs should be performed by either the operator or the user.
  • Page 6 DECLARATION OF CONFORMITY (CE) DECLARATION OF CONFORMITY (CE) The manufacturer declares that the 230-VAC versions of the Data Voice Multiplexor conform to the following standards: EMC: EN 55022 (1994) Limits and methods of measurement of radio- disturbance characteristics of information- technology equipment.

  • Page 7: Table Of Contents

    DATA VOICE MULTIPLEXORS Contents Chapter Page 1. Specifications ....................8 1.1 General (High-Level) ................8 1.2 Main Link ....................8 1.3 Data Channels ..................9 1.4 Voice Channels ..................10 1.5 General (Low-Level)................13 2. Introduction....................14 2.1 Overview ....................14 2.2 A Typical Application ................21 2.3 Dialup-Mode Guidelines...............23 2.3.1 Conditions for Activation/Deactivation of a Voice Channel ...23 2.3.2 Conditions for Activation/Deactivation of a Data Channel..23 2.3.3 Conditions for Activation of the Main Link ......24...
  • Page 8 5.1.4 Remote Data-Channel Loopback..........53 5.1.5 Remote Voice-Channel Loopback ..........54 5.1.6 Remote Main-Channel Loopback..........54 5.2 Problems That Might Be Indicated .............56 5.3 Calling Black Box..................59 5.4 Shipping and Packaging...............59 Appendix A: Interface Pinouts................60 A.1 Main Link and Data-Channel Interfaces ..........60 A.2 Voice-Channel Interfaces ..............62 Appendix B: Rackmounting................63...

  • Page 9: Specifications

    DATA VOICE MULTIPLEXORS 1. Specifications 1.1 General (High-Level) Compliance — FCC Part 15 Subpart B Class A, DOC Class/MDC classe A; 230-VAC models only: CE Multiplexor Type — 3-channel adaptive Multiplexing Bit-interleaved time-division multiplexing Method — Management and Supervision Overhead — 0.8 kbps for main-link data rates from 9.6 to 32 kbps;...

  • Page 10: Data Channels

    CHAPTER 1: Specifications 1.3 Data Channels Data Rate — 0.8 to 252.8 kbps, depending on mode and main-link data rates: ADAPTIVE mode: Main-link rate minus voice-channel rate minus overhead if at least one voice channel is active; Main-link rate minus overhead if both channels are idle;...

  • Page 11: Voice Channels

    DATA VOICE MULTIPLEXORS 1.4 Voice Channels 1.4.1 G ENERAL Number of Voice Channels — MX270 through MX273 models: Two; MX274 through MX277 models: One Digitizing Technique and Voice-Transmission Rates— ITU-T Rec. G.723 compliant MPMLQ low-bit-rate digitizing at 4.8, 6.4, 7.2, 9.6, or 12.8 kbps Fax Support and Fax Rates—...
  • Page 12 CHAPTER 1: Specifications 1.4.2 A NALOG HARACTERISTICS KBPS Nominal Transmit Level — +2 to –13 dBm, independently adjustable for each channel in steps of 1 ±0.15 dB Nominal Independently adjustable for each channel in steps of Receive Level — 1 ±0.15 dB: FXO models: +2 to –13 dBm;...
  • Page 13 DATA VOICE MULTIPLEXORS 1.4.4 F HARACTERISTICS Standards — Supports Group III fax machines complying with ITU-T Rec. T.4 and T.30 Fax Data Rates/ Channel All with auto-fallback: Bandwidth — 2.4 kbps/4.8 kbps; 4.8 kbps/6.4 or 7.2 kbps; 7.2 kbps/9.6 kbps; 9.6 kbps/12.8 kbps 1.4.5 FXO I NTERFACE...

  • Page 14: General (Low-Level)

    CHAPTER 1: Specifications 1.5 General (Low-Level) Configuration Transfer — Downloading from “master” unit to “slave” unit across main link User Controls — Front-mounted: (2) Pushbuttons for diagnostic testing; (1) 3-position slide switch for channel selection; Internal: (4) Jumper blocks for various configuration options Diagnostics —...

  • Page 15: Introduction

    DATA VOICE MULTIPLEXORS 2. Introduction 2.1 Overview 2.1.1 P URPOSE AND EATURES The Data Voice Multiplexor (DVM) is a versatile adaptive time-division multiplexor (TDM) for voice, fax, and data. The DVM allows the multiplexing of one or two low-bit-rate voice/fax channels with one synchronous data channel, for transmission through a dialup or leased-line modem link operating at rates in the range of 9.6 through 256 kbps.
  • Page 16 CHAPTER 2: Introduction Thus, the DVM allows using a single modem link for the transmission of two voice/fax channels, and in addition allows the transmission of a data channel. The DVM, especially when operating in its unique adaptive multiplexing mode, offers very high bandwidth efficiency without introducing the long, variable link delay typical of statistical multiplexors.
  • Page 17 DATA VOICE MULTIPLEXORS The voice channels are available in two options: • 2W FXO interface: Two-wire 600-ohm analog interface and FXO loop-start signaling for direct connection to PABX extension lines. • 2W FXS interface: Two-wire 600-ohm analog interface and FXS loop-start signaling for direct connection of a subscriber telephone set.
  • Page 18 CHAPTER 2: Introduction 2.1.4 M HARACTERISTICS The electrical interface of the main link is user-selectable (X.21, V.35, V.36/ RS-449, RS-530, or RS-232). The main link is terminated with a DB15 female connector, wired for ITU-T X.21. When a different interface is selected, an appropriate adapter cable (available on a special-quote basis) must be inserted between the Data Voice Multiplexor and the cable connecting to the data-communication equipment (modem, CSU/DSU, etc.) serving the main link.
  • Page 19 DATA VOICE MULTIPLEXORS 2.1.6 B ANDWIDTH LLOCATION Bandwidth allocation is based on the automatic identification of the main link’s clock rate. After successful identification of the main link rate, the Data Voice Multiplexor assigns the bandwidth required by the voice channels (as selected by the user), and uses the remaining main-link bandwidth, except for the link- management and link-supervision overhead, to transmit the data channel.
  • Page 20 CHAPTER 2: Introduction • Non-adaptive mode 1: The bandwidth required for the voice channels (as selected by the user) is permanently assigned to these channels. The remaining bandwidth, minus the management and synchronization overhead, is available to the data channel. This mode is mainly intended to allow the connection of equipment that is capable of operating at non-standard data rates but cannot tolerate the clock-rate changes that occur routinely in the adaptive mode.
  • Page 21 DATA VOICE MULTIPLEXORS 2.1.7 O THER EATURES All the Data Voice Multiplexor’s operating parameters can be selected by the user, by means of internal jumpers and switches. To minimize setup time and to prevent configuration errors, the DVM has a master-slave configuration downloading facility.

  • Page 22: A Typical Application

    CHAPTER 2: Introduction 2.2 A Typical Application Figure 1-1 below shows a typical application for a DVM. This application shows how an organization can use the DVM to connect privileged telephone subscribers located in another city—at a main branch office, for example—to the PABX serving the head offices.
  • Page 23 DATA VOICE MULTIPLEXORS The DVMs are inserted between the IBM devices and the corresponding modems: • The IBM 3174 and IBM 37x5 are connected to the data channels of the two DVM units. • One local subscriber line of the PABX located at the main offices is connected to the first voice channel of the DVM.

  • Page 24: Dialup-Mode Guidelines

    CHAPTER 2: Introduction 2.3 Dialup-Mode Guidelines The dialup mode allows the use of a switched PSTN line to connect between two Data Voice Multiplexor units, thereby reducing the operating cost as the line is used only on demand. The dialup mode requires the use of the master-slave configuration. For proper operation, the DVM installed at the central location must be defined as the master, and the other DVM must be defined as the slave.

  • Page 25: Conditions For Activation Of The Main Link

    DATA VOICE MULTIPLEXORS 2.3.3 C ONDITIONS FOR CTIVATION OF THE A DVM will activate the main link to the other DVM upon the detection of the first valid request for connection. The link will remain connected as long as at least one valid request is present.

  • Page 26: Dialup Modem Settings

    CHAPTER 2: Introduction 2.3.5 D IALUP ODEM ETTINGS Before starting the operation, the dialup modems serving the main link must be configured as follows: • Synchronous operation. • Modem clock source: - Modem connected to the master DVM: Internal clock. - Modem connected to the slave DVM: Loopback timing (that is, its transmit timing must be locked to the recovered receive clock).

  • Page 27: Control Over The Main-Link Modems

    DATA VOICE MULTIPLEXORS 2.3.6 C ONTROL VER THE ODEMS The control of the dialup modems serving the main link is made by means of the DTR line of the DVM’s main link interface. Assuming that the modems were configured as explained in Section 2.3.1.E, the sequence for setting up and for disconnecting the link between two DVM units is as follows: •...

  • Page 28: System-Bandwidth Utilization

    CHAPTER 2: Introduction 2.4 System-Bandwidth Utilization Tables 1-1 and 1-2 below and on the next page list the bandwidth available to the DVM data channel as a function of the number and digitizing rate of the voice channels: • Table 1-1 provides the data-channel bandwidths for the adaptive and non- adaptive 1 modes.
  • Page 29 DATA VOICE MULTIPLEXORS Table 2-2. Data-Channel Bandwidth in Kilobits per Second as a Function of Voice-Channel and Main-Link Rates for Non-Adaptive Mode 2 Main- Data-Channel Bandwidth (kbps) vs. Link Voice-Channel Digitizing Rate (kbps) Data One Voice Channel Two Voice Channels Rate 12.8 12.8...

  • Page 30: System-Timing Considerations

    CHAPTER 2: Introduction 2.5 System-Timing Considerations This section explains the timing modes and clock rates available for the main link of the DVM, and for its data and voice channels. 2.5.1 M IMING The main link transmit and receive paths of the DVM require external receive and transmit clock signals derived from the network clock.

  • Page 31: Installation

    Carefully take the Data Voice Multiplexor and all its accessories out of the box and place them securely on a clean surface. Inspect everything: You should have received the DVM itself, a power cord, two interface-adapter cords, and this manual. If anything’s missing or damaged, call Black Box right away.

  • Page 32: Site Requirements

    CHAPTER 3: Installation 3.2 Site Requirements 3.2.1 P OWER POWER REQUIREMENTS Data Voice Multiplexor units should be installed within 1.5 m (5 feet) of an easily accessible grounded AC mains outlet capable of furnishing the nominal supply voltage of the DVM (either 115 or 230 VAC). The supply voltage is marked on a label located on the rear panel, near the power connector.

  • Page 33: Configuration

    DATA VOICE MULTIPLEXORS 3.3 Configuration The Data Voice Multiplexor contains several printed circuit boards, identified in Figure 3-1: • Main board. This board contains most of the DVM circuits. • Voice-channels module. In accordance with your order, this module can include one or two voice channels.

  • Page 34: Opening The Dvm's Case

    CHAPTER 3: Installation 3.3.1 O DVM’ PENING THE The Data Voice Multiplexor’s jumpers are located on its boards, which are attached to the rear panel. To reach the internal jumpers: 1. Disconnect all the cables connected to the DVM. 2. Unscrew the two large captive screws located on the rear panel. 3.

  • Page 35: The Main-Board Jumpers

    DATA VOICE MULTIPLEXORS 3.3.2 T OARD UMPERS The user-selectable jumpers located on the main board of the Data Voice Multiplexor are identified in Figure 3-2. In addition to the jumpers identified in Figure 3-2, there are other factory-set jumpers on the main board which must not be moved. J1: Sw.
  • Page 36 CHAPTER 3: Installation 3.3.2.A Switch-Control Jumper J1 This jumper allows you to disable the front-panel PATT and RLB pushbuttons, to prevent the activation of tests and loops by unauthorized persons. It has two positions: ENBL (default setting): The front-panel pushbuttons can control the activation of tests and loops.
  • Page 37 DATA VOICE MULTIPLEXORS SLAVE: The DVM operates as a slave unit. That is, its configuration is determined by the information downloaded through the main link by the remote unit. The use of a master-slave configuration expedites link setup and reduces the chance of configuration errors;...

  • Page 38: The Controls On The Voice-Channel Module

    CHAPTER 3: Installation 3.3.3 T ONTROLS ON THE OICE HANNELS ODULE The user controls located on the Data Voice Multiplexor’s voice-channels module are identified in Figure 3-3. NOTE In a master-slave configuration, the digitizing rate and the number of voice channels selected on the voice-channels module of the DVM unit selected as master are downloaded to the slave unit.
  • Page 39 DATA VOICE MULTIPLEXORS Channel 1 Transmit-Level Adjustment Channel 1 Receive-Level Adjustment Channel 2 Transmit-Level Channel 2 Adjustment Receive-Level Adjustment Voice Channel 2 Enable/Disable Rate Selection Figure 3-3. Controls on the Voice-Channels Module...
  • Page 40 CHAPTER 3: Installation 3.3.3.B VOICE2-Enable/Disable Switch SW5 On Data Voice Multiplexor units equipped with two voice channels, this switch allows the user to disable voice channel 2. By disabling voice channel 2, the bandwidth available to the data channel is increased. The switch has two positions: DIS: Voice channel 2 is disabled.

  • Page 41: When You're Finished

    DATA VOICE MULTIPLEXORS The input and output levels can be set in 1-dB steps in the range of +2 dBm to –13 dBm, as shown in Table 3-2. In addition, a reference table is attached to the top of the DVM’s power transformer. Table 3-2.

  • Page 42: Making Cable Connections

    CHAPTER 3: Installation 3.4 Making Cable Connections Figure 2-7 below shows the Data Voice Multiplexor’s rear panel. The DVM has two DB15 female connectors located on the rear panel, one for connection to the main link, and the other for the data channel. In addition, the DVM’s rear panel includes two RJ-45 connectors for the two voice channels.

  • Page 43: Power Connections

    DATA VOICE MULTIPLEXORS 3.4.2 P OWER ONNECTIONS The Data Voice Multiplexor does not have an on/off switch, so it will start operating as soon as power is connected. WARNING! BEFORE POWERING UP this instrument and before connecting any other cable, the protective earth terminals of this instrument must be connected to the protective conductor of the power cord.

  • Page 44: Data-Channel Connections

    CHAPTER 3: Installation 3.4.4 D HANNEL ONNECTIONS The Data Voice Multiplexor’s data-channel interface is configured as a data- communication equipment (DCE) interface, thereby allowing direct connection to data-terminal equipment (DTE). The data-channel connector is a DB15 female connector, wired as ITU-T X.21. When a different interface is selected by means of the internal jumper, an interface conversion adapter cable must be inserted between the DVM and the cable connecting the user’s equipment.

  • Page 45: Operation

    DATA VOICE MULTIPLEXORS 4. Operation 4.1 The Front-Panel Indicators and Controls Figure 3-1 shows the front panel of the Data Voice Multiplexor. The numbered components are identified in Table 3-1. ❶ ❷ ❸ ❹ ❺ ❻ ❼ ❽ Figure 3-1. The DVM’s front panel.
  • Page 46 CHAPTER 4: Operation Table 3-1. The DVM’s Controls and Indicators Item Control or Indicator Function PWR LED Lights when the DVM is powered ON. TEST LED Lights steadily when a BERT test, tone injection, or a remote loop is active on the DVM.

  • Page 47: Special Diagnostic Indications

    DATA VOICE MULTIPLEXORS 4.1.1 S PECIAL IAGNOSTIC NDICATIONS In addition to the basic indications listed in Table 3-1, additional fault conditions can be indicated. The indications used for these conditions are combinations of display states based on simultaneous lighting of SYNC LOSS and the flashing of the TEST indicator, and a specific state of the TD and RD/ERR indicators.

  • Page 48: Operating Procedure

    CHAPTER 4: Operation 4.2 Operating Procedure After being prepared for operation using the instructions in Chapter 3, the Data Voice Multiplexor normally operates unattended. Operator intervention is only required when the DVM is set up for the first time, or must be adapted to new operational requirements that require the changing of the internal settings.

  • Page 49: Monitoring Channel Activity

    DATA VOICE MULTIPLEXORS 4.2.3 M ONITORING HANNEL CTIVITY To monitor traffic activity on a desired channel or on the main link, set the SELECT switch to the corresponding position. The TD and RD/ERR indicators show the traffic activity on selected channel (their brightness is proportional to the traffic load).

  • Page 50: Bert Activation

    CHAPTER 4: Operation 4.2.5 BERT A CTIVATION To activate the BERT (bit-error-rate test), set the SELECT switch to the DATA position, and then press the PATT button. The TEST indicator turns on, the TD indicator must light, and the RD/ERR indicator lights if errors are detected (ideally, the RD/ERR indicator should remain off during the test).

  • Page 51: Tone Injection

    DATA VOICE MULTIPLEXORS 4.2.6 T NJECTION To activate tone injection, set the SELECT switch to the VOICE position, and then press the PATT button. The TEST indicator turns on. The remote side should hear a 1000-Hz tone at the nominal channel level (0 dBm).

  • Page 52: Troubleshooting

    CHAPTER 5: Troubleshooting 5. Troubleshooting 5.1 The Diagnostic Functions Three types of diagnostic functions are available on the Data Voice Multiplexor: • Remote loopback. • Bit-error-rate testing (BERT, available only on the data channel). • Tone injection (available only on the voice channels). The BERT, tone injection, and remote loop are initiated from the front-panel PATT and RLB pushbuttons, respectively, on the channel currently selected with the SELECT switch.

  • Page 53: Activating A Diagnostic

    DATA VOICE MULTIPLEXORS 5.1.1 A CTIVATING A IAGNOSTIC A test or loop is activated on the channel selected by the SELECT switch by pressing the corresponding button on the front panel. As long as any test or loop is activated, the TEST indicator lights. To deactivate the test or loop, press the same pushbutton again.

  • Page 54: Tone Injection

    CHAPTER 5: Troubleshooting 5.1.3 T NJECTION The test tone (1000 Hz, 0 dBm) is a digital sequence, repeating at a rate of 1000 Hz, generated by the digital voice processor and sent to the remote side. The sequence is identical to the data stream that would have been generated if a 1000- Hz signal at a nominal level of 0 dBm were applied to the input of the voice channel being tested.

  • Page 55: Remote Voice-Channel Loopback

    DATA VOICE MULTIPLEXORS Remote DVM Local DVM Voice- Voice- Channel Channel Common Interface Interface Common Logic and Main Logic and Main-Link Link Main-Link Interface Interface Data- Data- Channel Channel Interface Interface Figure 5-1. Remote loopback of the data channel. 5.1.5 R EMOTE OICE HANNEL...
  • Page 56 CHAPTER 5: Troubleshooting Remote DVM Local DVM Voice- Voice- Channel Channel Interface Interface Common Common Main Logic and Logic and Link Main-Link Main-Link Interface Interface Data- Data- Channel Channel Interface Interface Figure 5-2. Remote loopback of the main link.

  • Page 57: Problems That Might Be Indicated

    DVM is connected. Try a different outlet. 2. Blown fuse. Replace with a fuse of the proper rating. 3. Defective DVM. Call Black Box for technical support. TEST flashes SYNC LOSS lights TD and RD/ERR light Local DVM failed self-test.
  • Page 58 Deactivate tone injection, activate the voice- channel loop, and check that a strong sidetone is heard in the telephone set earpiece. If not, call Black Box for technical support (there may be a fault on main board or on the interface board).

  • Page 59: Calling Black Box

    If you need to transport or ship your Data Voice Multiplexor: • Package it carefully. We recommend that you use the original container. • Before you ship the unit back to Black Box for repair or return, contact us to get a Return Authorization (RA) number.

  • Page 60: Appendix A: Interface Pinouts

    APPENDIX A: Interface Pinouts Appendix A: Interface Pinouts This appendix provides information on the types and pinouts of the various interface connectors of the Data Voice Multiplexor and its adapter cables. (Note that the adapter cables for the link and data channels are identical, despite some slight differences in the pin functions.) In the “Direction”...

  • Page 61: Main Link And Data-Channel Interfaces

    DATA VOICE MULTIPLEXORS A.1 Main Link and Data-Channel Interfaces The main link and data-channel interface connectors are DB15 female connectors pinned out for the ITU-T X.21 interface. The V.35 models of the Data Voice Multiplexor come with adapter cables that patch these to M/34 connectors pinned out for ITU-T V.35, as shown in Table A- 1.
  • Page 62 APPENDIX A: Interface Pinouts The RS-232/V.24 models of the Data Voice Multiplexor come with adapter cables that patch the main-link and data-channel connectors to DB25 connectors pinned out for EIA/TIA RS-232 (ITU-T V.24), as shown in Table A- 2. Table A-l. Main Link and Data-Channel Interface Connectors and RS-232/V.24 Adapter-Cable Connectors DB15 DB25...

  • Page 63: Voice-Channel Interfaces

    DATA VOICE MULTIPLEXORS A.2 Voice-Channel Interfaces The voice-channel interface has 8-pin RJ-45 connectors, but only the two center pins (Pins 4 and 5) are used: In both the FXO and FXS interfaces, Pins 4 and 5 carry 2-wire voice input/output.

  • Page 64: Appendix B: Rackmounting

    APPENDIX B: Rackmounting Appendix B: Rackmounting The Data Voice Multiplexor can be installed in 19" racks. Unit height corresponds to 1U (1.75"), and the width is slightly less than half of the available mounting width. You can install either a single unit or two units side by side in your rack; our optional adapter kit (RM523) has all the parts you need for either installation.

  • Page 65: Rackmounting A Single Dvm

    DATA VOICE MULTIPLEXORS B.1 Rackmounting a Single DVM The single-unit rack-adapter kit includes one short bracket and one long bracket. The brackets are fastened by means of screws to the two side walls of the case, as shown in Figure B-1. Figure B-1.

  • Page 66: Rackmounting Two Dvms Side By Side

    APPENDIX B: Rackmounting B.2 Rackmounting Two DVMs Side By Side The dual-unit rack adapter kit includes two rails for attaching the two units side by side, two short adapter brackets, and various hardware. Refer to Figure B-2 and prepare the two DVM units for attachment as directed on the next page. Figure B-2.
  • Page 67 DATA VOICE MULTIPLEXORS 1. Fasten one short adapter bracket to the left-hand side wall of the unit intended to be on the left. Use two of the four longer screws supplied in the kit, and insert flat washers. 2. Use the same procedure to fasten the second short adapter to the right-hand wall of the unit intended to be on the right.
  • Page 68 LEGAL INFORMATION PERMISSION-REQUIREMENT STATEMENT This manual contains information proprietary to the manufacturer. No part of this publication may be reproduced in any form whatsoever without prior written approval by the manufacturer. DISCLAIMERS No representation or warranties for fitness for any purpose other than what is specifically mentioned in this manual are made either by the manufacturer or its agents.
  • Page 69 NAME...
  • Page 70 © 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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