East Coast Datacom DMM-X21 Operation Manual
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East Coast Datacom DMM-X21 Operation Manual

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CHAPTER 1 - INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1
FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CHAPTER 2 - BASIC OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
FRONT PANEL INDICATORS AND SWITCHES . . . . . . . . . . . . . . . . . .
2.2
REAR PANEL CONNECTORS AND FUSES . . . . . . . . . . . . . . . . . . . . .
2.3
CLOCKING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4
ELECTRICAL INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5
SUBCHANNEL SERVICE MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6
ANTI-STREAMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7
INTERNAL CLOCK SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8
MANUAL DTE/DCE REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9
FALL BACK TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10
CASCADING OR CONCATENATION . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.11
INDICATE (I) LEAD (PORTS 1 - 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.12
CONTROL (C) LEAD (PORTS 1 - 4) . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.13
DCE / DTE SWITCHES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.14
FIFO GENERAL OPERATION (J14) . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.15
MASTER CHANNEL FIFO (J15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.16
CHAPTER 3 - INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1
VOLTAGE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2
VOLTAGE SELECTION FUSES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
POWER CONNECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4
DEFAULT CONFIGURATION SWITCH SETTINGS . . . . . . . . . . . . . . .
3.5
4.0 - APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1
X.21 INTERFACE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2
FACTORY DEFAULT CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3
ADDRESSES OF STANDARDS ORGANIZATIONS . . . . . . . . . . . . . . . . . . .

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Summary of Contents for East Coast Datacom DMM-X21

  • Page 1: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 - INTRODUCTION ........Page 1 FUNCTIONAL DESCRIPTION .
  • Page 2 OPERATIONS MANUAL DIGITAL MIXING MODULE DMM-X21 14 March 1997 FOR TECHNICAL SUPPORT CALL: East Coast Datacom, Inc. 571 Haverty Court, STE N Rockledge, FL 32955 USA TEL: (800) 240-7948 or (407) 637-9922 FAX: (407) 637-9980 Email: ecdata@ix.netcom.com Web Site: www.ecdata.com Manufactured By East Coast Datacom, Inc.
  • Page 3 PROPRIETARY NOTICE The information contained herein is proprietary to East Coast Datacom, Inc. Any reproduction or redistribution of this publication, in whole or in part, is expressly prohibited unless written authorization is provided by East Coast Datacom, Inc.

  • Page 4: Chapter 1 - Introduction

    X.21 devices to share a modem or computer port. Any combination of terminals and modems may be used in a network environment. Each port of the DMM-X21 conforms to the ITU X.21 standard and may be selected as a DCE or DTE interface.

  • Page 5: Theory Of Operation

    Control (C) or Indicate (I). When (C) is raised, the DMM-X21 will lock on to that port and allow that DTE device to talk to the modem link. The DMM-X21 will remain locked onto that port until (C) is dropped. After (C) has dropped, the DMM-X21 will automatically begin scanning the ports until another port raises (C) or (I).

  • Page 6: Electrical Interface

    East Coast Datacom, Inc. DMM-X21 OPERATIONS MANUAL ELECTRICAL INTERFACE The DMM-X21 is ITU V.11, X.21 compliant, utilizing female DB-15 connectors. Refer to the interface chart in the Appendix for detailed interface information. SUBCHANNEL SERVICE MODES The DMM-X21 incorporates circuitry that enables the user to scan each sub-channel port.

  • Page 7: Manual Dte/Dce Removal

    A streaming terminal is defined as a terminal that has Control (C) continually high. With Anti-streaming disabled, the associated streaming DTE will NOT illuminate a Yellow LED on the front of the DMM-X21. If the automatic anti-streaming circuitry is disabled and a streaming condition occurs, the other DTE devices will be blocked from accessing the communications link.

  • Page 8: Indicate (I) Lead (Ports 1 - 4)

    MSD-4 AND MSD-8 INSTALLATION AND OPERATIONS MANUAL 2..11 INDICATE (I) LEAD The DMM-X21 has internal jumpers for the Indicate (I) Lead. This option will allow Indicate(I) to follow Control(C) or to be forced active when the port is set to DCE. 2..12 CONTROL (C) LEAD The DMM-X21 has internal jumpers for Normal or Forced Control (C).

  • Page 9: Chapter 3 - Installation

    Shurter, Inc. Part #'s are: 315ma = 034.3112 and 160ma = 034.3109 POWER CONNECTION Before connecting the DMM-X21 to an AC power source the top cover should be installed with the supplied #8-32 screws. AC power is supplied to the DMM-X21 through a 2.3m (6.6 ft) cord terminated by a grounded 3-prong plug.

  • Page 10: Default Configuration Switch Settings

    If your system application requires one or more of the default settings to be changed, it will be necessary to remove the top cover of the DMM-X21. Remove the AC Power source or Disconnect the AC Power before servicing the unit. Removal of the top cover is accomplished by using a small Philips screwdriver and removing the four outside screws.

  • Page 11: 4.0 - Appendix

    East Coast Datacom, Inc. DMM-X21 OPERATIONS MANUAL 4.0 - APPENDIX X.21 INTERFACE CHART ITU X.21 INTERFACE CHART (DB-15 CONNECTOR) PIN NUMBER PIN NAME FROM DCE FROM DTE SHIELD TRANSMIT(A+) CONTROL (A+) RECEIVE (A+) INDICATE (A+) SIGNAL TIMING (A+) BYTE TIMING (A+)

  • Page 12: Factory Default Chart

    East Coast Datacom, Inc. DMM-X21 OPERATIONS MANUAL FACTORY DEFAULT CHART 1 2 3 4 5 6 7 8 9 1 0 DMM-X21 FACTORY DEFAULT / SWITCH GUIDE Page 10...

  • Page 13: Addresses Of Standards Organizations

    East Coast Datacom, Inc. DMM-X21 OPERATIONS MANUAL ADDRESSES OF STANDARDS ORGANIZATIONS Outside the United States International Organization for Standardization Central Secretariat ANSI 1 rue de Varembe American National Standards Institute CH-1211 Geneva, Switzerland 1430 Broadway Telephone +41 22 34-12-40 New York, NY 10018...
  • Page 14 5.0 - TECHNICAL SPECIFICATIONS 100-120 to 200-220VAC @10%, 50/60Hz, 0.16/0.08A, external 110/220 volt select Application switch, IEC Power Inlet, (2) 5mm Fuses Multiple X.21 Synchronous DCE or DTE devices contending in a polled environment, to share one Digital DCE or DTE interface Environmental ..

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