Black Box Micro T1 CSU Manual
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Black Box Micro T1 CSU Manual

Black Box Micro T1 CSU Manual

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JUNE 1999
MT120A-R2
Micro T1 CSU/DSU
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 Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners. CE Notice The CE symbol on your Micro T1 CSU/DSU indicates that it is in compliance with the Electromagnetic Compatibility (EMC) directive and the Low Voltage Directive (LVD) of the Union European (EU).
  • Page 3 MICRO T1 CSU/DSU 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. It has been tested...
  • Page 4 NOM STATEMENT 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 5 MICRO T1 CSU/DSU 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...
  • Page 6 FCC REQUIREMENTS FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT 1. If you have problems with your telephone equipment after installing this device, disconnect this device from the line to see if it is causing the problem If it is, contact your supplier or an authorized agent. 2.
  • Page 7 MICRO T1 CSU/DSU CERTIFICATION NOTICE FOR EQUIPMENT USED IN CANADA The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications-network protective, operation, and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction.

  • Page 8: Table Of Contents

    CONTENTS Contents Chapter Page 1. Specifications ......................8 2. Introduction ......................9 2.1 Description ....................9 2.2 Features ......................9 2.3 Supported Applications ................9 2.3.1 As an Interface Between the Telco and CPE ........10 2.3.2 As a High-Speed Short-Range Modem ..........10 3. Configuration ......................11 4.

  • Page 9: Specifications

    MICRO T1 CSU/DSU 1. Specifications 1.544 Mbps WAN Speed — WAN Connection — RJ-48C Nominal Impedance — 100 ohms DTE Interface — Integral V.35, M/34 male Line Coding — AMI/B8ZS Line Framing — D4/ESF Receive LBO — Automatic Transmit LBO —...

  • Page 10: Introduction

    2. Introduction 2.1 Description The Micro T1 CSU/DSU supports a single T1 or Fractional T1 connection at data rates of 1.544 Mbps (unstructured), n × 64, and n × 56. Plug the Micro T1 CSU/DSU directly into the WAN port of a switch, router, or multiplexor.

  • Page 11: As An Interface Between The Telco And Cpe

    2.3.2 A PEED HORT ANGE ODEM The Micro T1 CSU/DSU can also be installed in high-speed campus applications. In this application, a pair of Micro T1 CSU/DSUs operate as short-range modems. Bridge/Router Micro T1 CSU/DSU 1.544 Mbps or nx56/64 Bridge/Router...

  • Page 12: Configuration

    CHAPTER 3: Configuration 3. Configuration Before operating the Micro T1 CSU/DSU, you must configure it to match both the DTE and Network Interface parameters using the DIP-switch packages on the bottom of the printed circuit board (see Figure 3-1) or via software using the RS-232 control port.
  • Page 13 MICRO T1 CSU/DSU DIP S SW1-SW8 WITCHES The configuration switches on the DIP switches allow you to specify data rates, line framing and coding, DS0 rate, clock mode, starting channel, and Line Build-Out (LBO). Factory-default settings of all switches are shown in the table below.
  • Page 14 CHAPTER 3: Configuration SW1-8, SW1-7, SW1-6, SW1-5, SW1-4 WITCHES These switches set the DTE data rate. Each setting represents an n × 56/n × 64 setting. Table 3-3 shows the switch settings and the achieved DTE data rate. Table 3-3. DTE Data Rate. SW1-4 SW1-5 SW1-6 SW1-7 SW1-8 DTE Data Rate 1544 kbps (unframed)
  • Page 15 13 × 64 kbps (channels 12–24), or 832 kbps. Keep this in mind when setting the starting channel. The Micro T1 CSU/DSU will flash the ERR indicator LED if the switch setting is invalid. Refer to Section 5.1 for a more detailed explanation of the ERR LED function.
  • Page 16 CHAPTER 3: Configuration SW2-6 SW2-5 L WITCHES UILD These switches are used to set the line build out (LBO). The LBO controls the pulse shape and attenuation of the signal sent to the network. The amount of LBO depends on the distance to the nearest repeater. The telephone company providing the T1 service will advise you of the required LBO setting.
  • Page 17 This switch is used to set the frame. There are three framing modes available in the Micro T1 CSU/DSU: ESF, D4, and Unframed. When SW1-4 through SW1-8 are turned off, the unit is set to unframed operation, and SW2-3 is ignored. Otherwise, SW2-3 is used to set the frame to either ESF or D4.
  • Page 18 NOTE When using the Micro T1 CSU/DSU to terminate the telephone company’s T1 service, the Micro T1 CSU/DSU must be set to network clock. When using the CSU/DSU as a high-speed short-range modem, one unit of the link must be configured for Internal Clock mode, and the unit on the opposite end must be configured for Network Clock mode.

  • Page 19: Installation

    The Micro T1 CSU/DSU is powered via a supplied external transformer, which connects to the barrel jack on the rear of the Micro T1 CSU/DSU. The Micro T1 CSU/DSU can also be powered via the DTE interface when supplied with 5 VDC @...

  • Page 20: Operation

    CHAPTER 5: Operation 5. Operation Once the Micro T1 CSU/DSU is installed and configured properly, it is ready to place into operation. 5.1 LED Descriptions The Micro T1 CSU/DSU is equipped with seven LEDs that monitor the status of communication. Figure 5-1 shows the location of the LEDs on the Micro T1 CSU/DSU.
  • Page 21 MICRO T1 CSU/DSU Errored Second: In ESF or SF framing, if the unit detects a frame error, the ERR LED will flash briefly once a second. Framing Mismatch: The ERR LED flashes briefly once a second when framing modes are mismatched.

  • Page 22: Central Office Loops

    5.2 Central Office Loops The Micro T1 CSU/DSU also responds to central-office-initiated loop commands. When in D4 framing mode, the Micro T1 CSU/DSU will implement the “loop up” command when it recognizes the pattern “10000” in the data stream for a minimum of 5 seconds.

  • Page 23: Appendix A: Cable Recommendations

    MICRO T1 CSU/DSU Appendix A. Cable Recommendations The Micro T1 CSU/DSU operates at frequencies of 20 kHz or less and has been performance tested using twisted-pair cable with the following characteristics: Wire Gauge Capacitance Resistance 19 AWG 83 nf/mi. or 15.72 pf/ft.

  • Page 24: Appendix B: Pin Assignments

    APPENDIX B: Pin Assignments Appendix B. Pin Assignments RJ-48C T1 (DS0) Network Interface (RJ-48 female modular jack) Pin # Signal RX Data (TIP) RX Data (RING) TX Data (TIP) TX Data (RING) M/34 Connector Terminal Interface Pin # Signal GND (Earth Ground/Shield) SGND (Signal Ground) XTC (Transmit Clock +, DTE Source) RC (DCE Source)

  • Page 25: Appendix C: Power-Supply Interface

    MICRO T1 CSU/DSU Appendix C. Power-Supply Interface Main 5 VDC power jack (J1) Center Pin: 5 VDC @300 mA Outer Barrel: Ground Auxiliary Power: Supplied to Pin KK on V.35 connector Jumper Position for Power via DC Power Jack (Default).
  • Page 26 © Copyright 1999. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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