Black Box MX873A Manual
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Black Box MX873A Manual

Black Box MX873A Manual

Miniature local mux-12
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MAY 1998
MX873A
Miniature Local Mux-12
O S S
S Y N C L
P O W E R
O C
R E M L
T E S T
IN P U T
9 V - D C
CUSTOMER SUPPORT INFORMATION
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

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  • Page 1 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...
  • Page 2 MINIATURE LOCAL MUX-12 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...
  • Page 3 MINIATURE LOCAL MUX-12 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 LOCAL MUX-12 10. El equipo eléctrico 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 eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como se indique en el aparato.
  • Page 5 MINIATURE LOCAL MUX-12 TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

  • Page 6: Table Of Contents

    MINIATURE LOCAL MUX-12 Contents Chapter Page 1. Specifications....... 7 1.1 Sub Channels......7 1.2 Main Channel .
  • Page 7 MINIATURE LOCAL MUX-12 Contents (continued) Chapter Page 4. Operation ....... . . 20 4.1 General .

  • Page 8: Specifications

    MINIATURE LOCAL MUX-12 1. Specifications 1.1 Sub-Channels Transmission Format—Asynchronous Mode of Operation—Full duplex Data Rate—Up to 19.2 kbps Interface—EIA RS-232/CCITT V.24 Connectors—(12) RJ-45 female Number of Sub-channels—12 Distortion—See Table 1-1. User may select six sub- channel operation for reduced distortion by internal strapping.

  • Page 9: Main Channel

    MINIATURE LOCAL MUX-12 1.2 Main Channel Transmission Line—4-wire unconditioned telephone lines (two twisted pairs) Operating Range—1 mile (1.6 km) maximum on 22 AWG cable (actual distance may vary, depending on the cable you use) Data Rate—1.2288 Mbps Output Format—Balanced bipolar transformer isolated Output Level—6 V ptp (on 100 ohms) Input Resistance—110 ohms Connectors—(1) RJ-45 female...
  • Page 10 MINIATURE LOCAL MUX-12 Temperature—32 to 122°F (0 to 50°C) Humidity—Up to 95%, noncondensing Power Consumption—Input: 110 VAC, Output: 200 mA @ 9 VDC " H x 4.5 " W x 7.4 " D (3.4 x 11.4 x 18.7 cm) Size—1.3 Weight—10.7 oz.

  • Page 11: Introduction

    MINIATURE LOCAL MUX-12 2. Introduction 2.1 General The Miniature Local Mux-12 is a time-division multiplexor that enables up to 12 terminals to be multiplexed onto a single cable, in point-to-point applications. The Mux-12 contains a built-in line driver that extends the high-speed multiplexed data over twisted pairs.

  • Page 12: Applications

    MINIATURE LOCAL MUX-12 NOTE Whenever possible (when the number of channels is 6 or less), we advise operating the Mux in the 6-channel mode, which results in less distortion. Table 2-1. Performance at various bit rates. Sub-channel Distortion (%) Distortion (%) bit rate (kbps) 6-channel mode 12-channel mode...

  • Page 13: Miniature Local Mux

    MINIATURE LOCAL MUX-12 Miniature Local Mux-12 Host Terminals Figure 2-1. Typical point-to-point installation. For installations involving clusters of terminals distributed in several locations, the Mux-12 units may be installed in a ring-type configuration as shown in Figure 2-2. At each site, the unconnected channels must be bypassed by shorting TX pin to RX pin of the relevant sub-channel’s connector.
  • Page 14 MINIATURE LOCAL MUX-12 Miniature Miniature Terminals Local Mux-12 Local Mux-12 Host Miniature Local Mux-12 Terminals Figure 2-2. Typical ring installation.

  • Page 15: Installation

    MINIATURE LOCAL MUX-12 3. Installation 3.1 General This chapter provides the information you need to implement the mechanical and electrical installation of the Mux-12. After installation is complete, refer to Chapter 4 for operating information and system checkout to assure normal operation. 3.2 Physical Installation The Mux-12 comes completely assembled and is designed to be secured to a bench or wall using screws.
  • Page 16 MINIATURE LOCAL MUX-12 1. Open the top half of the plastic case by squeezing the marked places on the sides. 2. Strap the multiplexor for 6 or 12 sub-channels according to the printed circuit board. 3. To close the unit, simply press the two halves of the case together.

  • Page 17: Electrical Installation

    MINIATURE LOCAL MUX-12 of one unit should be connected to the Receive Pair of the other unit, and vice versa. All LEDs should be “OFF” (with the exception of “POWER”) indicating normal operation. 3.5 Electrical Installation 3.5.1 AC P OWER The Mux is powered by an external power supply of 9 to 12 VDC capable of supplying at least 300 mA.
  • Page 18 MINIATURE LOCAL MUX-12 Table 3-1. Sub-channel connector pin assignments. CCITT V.24 EIA RS-232C Pin No. Signal Name Description Signal Ground Common signal. Transmit Data Serial data from DTE into the Mux. Receive Data Serial data output from the Mux Request to Send Connected to CTS.
  • Page 19 MINIATURE LOCAL MUX-12 Figure 3-1. RJ-45 socket (female) external view.
  • Page 20 MINIATURE LOCAL MUX-12 Figure 3-2. RJ-45 plug (male) clip at rear.

  • Page 21: Operation

    MINIATURE LOCAL MUX-12 4. Operation 4.1 General This chapter contains a list of the Mux-12’s indicators, their functions and operating procedures. Installation procedures given in Chapter 3 must be completed and checked before attempting to operate the Mux. 4.2 Indicators Four indicators are located on the Mux’s top panel (see Figure 4-1).

  • Page 22: Operation

    MINIATURE LOCAL MUX-12 the remote Mux is still not operational, the SYNC LOSS indicators should be lit. 4.3.2 O PERATION The Mux operates entirely unattended except when occasional monitoring of LED indicators is required. 4.3.3 P OWERING FF THE To power off the Mux, simply remove the power adapter from the AC source.

  • Page 23: Diagnostics

    MINIATURE LOCAL MUX-12 5. Diagnostics 5.1 Remote Loopback Remote loopback can be performed by the Mux-12 when operated in conjunction with the single-port Miniature Local Mux. The test is performed by pressing the RLB button switch located on the front panel of the single-port Mux, which results in looping data back from the remote Mux-12’s receiver to the transmitter.

  • Page 24: Fault Isolation And Troubleshooting

    MINIATURE LOCAL MUX-12 WARNING These service instructions are for use by qualified personnel only. To avoid shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. Table 5-1. Fault isolation and troubleshooting. Symptom Action All front-panel...

  • Page 25: Appendix: Bracket Assembly

    MINIATURE LOCAL MUX-12 Appendix: Bracket Assembly 1. The Mux is provided with two mounting brackets, which mate with a pair of slots on each end of the Mux case. 2. Each bracket has a pair of flanges that slide into the Mux case slots.
  • Page 26 MINIATURE LOCAL MUX-12 Figure A-2. Before mounting the brackets. Figure A-3. After mounting the brackets.
  • Page 27 © 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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