Black Box ME260A Owner's Manual
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Black Box ME260A Owner's Manual

Black Box ME260A Owner's Manual

Black box modular modem eliminator
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Modular Modem Eliminator
CUSTOMER
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
SUPPORT
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
R D - 2
T D - 2
R D - 1
T D - 1
P W R
ME260A
ME260AE
ME261C
ME262C
ME263C
R A T E
A
E
M O D
E M
M O D
I N .
T I C
E L I M
E L A S
E R
I N T .
B U F F
.
C O N V
AUGUST 2000
ME265C
ME266C
ME267C
ME268C
4 8 K
8 -
5 6 K
4 8 M
9 -
0 - 2 . 0
4 K
4 4 M
A - 6
1 - 1 . 5
2 K
2 4 M
B - 1 1
2 - 1 . 0
7 6 8 K
3 -
5 1 2 K
4 -
3 8 4 K
5 -
2 5 6 K
6 -
1 2 8 K
7 -

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  • Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX SUPPORT FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 FCC AND IC 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 J of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when the equipment...
  • Page 3 MODULAR MODEM ELIMINATOR 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 MODULAR MODEM ELIMINATOR TRADEMARKS The trademarks mentioned in this manual are the sole property of their owners.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS CONTENTS Chapter Page 1. Specifications......................7 1.1 Interface-Converter Mode .................7 1.2 Modem-Eliminator Mode ..................7 1.3 Elastic-Buffer Mode ....................7 1.4 Connectors ......................7 1.5 Power ........................7 1.6 Physical Data .......................8 1.7 Environment .......................8 2. Introduction ......................9 2.1 Functional Description..................9 2.2 Equipment Versions ...................9 2.2.1 Main Unit ....................9 2.2.2 Plug-in Interface Modules................9 2.2.3 Operating Modes ..................11...
  • Page 7 4.2.2 Operating Instructions ................39 4.2.3 Normal Indications.................39 4.2.4 Power-Off Procedure................39 5. Troubleshooting......................40 5.1 Things To Try ....................40 5.2 Calling Black Box .....................40 5.3 Shipping and Packaging ..................41 Appendix A: Interface Data ..................42 A.1 General-Purpose Modules................42 A.2 ITU G.703 Balanced Interface Modules ............44 Appendix B: Calculation of Elastic Buffer Over/Underflow Rate......45...

  • Page 8: Specifications

    Interface Module Connectors—ME261C: (1) DB25 female; ME262C: (1) 34-pin female; ME263C, ME267C, ME268C: (1) DB15 female; ME265C: (1) DB37 female; ME266C: (2) BNC (unbalanced interface) 1.5 Power Power—ME260A: 115 VAC, 60 Hz, 5 watts; ME260AE: 230 VAC, 50 Hz, 5 watts...

  • Page 9: Physical Data

    MODULAR MODEM ELIMINATOR 1.6 Physical Data Size—ME260A, ME260AE: 1.7"H x 10.5"W x 9.6"D (4.4 x 2.7 x 2.4 cm); Interface Modules: 2.7"H x 0.06"W x 3.9"D (7.0 x 0.1 x 9.9 cm) Weight—ME260A, ME260AE: 4.1 lb. (1.9 kg); ME261C, ME263C: 2.4 oz. (70 g);...

  • Page 10: Introduction

    Modular Modem Eliminator can operate at any rate up to 2.048 Mbps. • Modular Modem Eliminator, 230-VAC (part number ME260AE) —this model is identical to the ME260A, except that it operates at 230-VAC. 2.2.2 P NTERFACE...
  • Page 11 MODULAR MODEM ELIMINATOR General-Purpose Interface Modules The general-purpose interface modules are: • RS-232 Module (part number ME261C), EIA RS-232 (ITU V.24) • V.35 Module (part number ME262C), ITU V.35 • X.21 Module (part number ME263C), ITU X.21/V.11 • V.36 Module (part number ME265C), EIA RS-449/RS-422 (ITU V.36/V.11) These modules provide the corresponding electrical and physical interface.

  • Page 12: Operating Modes

    CHAPTER 2: Introduction 2.2.3 O PERATING ODES The Modular Modem Eliminator has three operating modes, which are described below. Interface-Converter Mode The interface-converter mode lets you connect a Data Terminal Equipment (DTE) device to a Data Communications Equipment (DCE) device that has a different interface.

  • Page 13: Timing Options For The Interface Modules

    MODULAR MODEM ELIMINATOR 2.2.4 T IMING PTIONS FOR THE NTERFACE ODULES The timing options offered by the Modular Modem Eliminator depend on two factors: • Types of interface modules installed in the Modular Modem Eliminator (general purpose, or ITU G.703), and the settings on these modules. •...
  • Page 14 CHAPTER 2: Introduction • DTE—the interface module accepts clock signals for the receive and transmit paths. Note that for the X.21 interface, the module has only a receive clock input. Figure 2-2 shows the flow of timing signals for the DTE mode. Transmit Clock Transmit Data Interface Module...

  • Page 15: Itu G.703 64-Kbps Codirectional Interface Module

    MODULAR MODEM ELIMINATOR 2.2.5 ITU G.703 64- (ME266C) KBPS DIRECTIONAL NTERFACE ODULE The 64-kbps co-directional interface specified by ITU G.703 includes only one transmit pair and one receive pair. To avoid the need for additional pairs, the line signal waveform specified by G.703 for the 64-kbps co-directional interface includes timing and framing information.
  • Page 16 CHAPTER 2: Specifications • LBT—the transmit clock is locked to the recovered receive clock (this mode is called “loopback timing”). Figure 2-4 shows the flow of timing signals with loopback timing. Data Transmit Transmit Clock Line Signal Circuits Interface Module (LBT Mode) Data...

  • Page 17: Itu G.703 1.544-Mbps And 2.048-Mbps Interface Modules

    MODULAR MODEM ELIMINATOR 2.2.6 ITU 1.544- 2.048-M (ME268C ME267C) NTERFACE ODULES The ITU G.703 1.544-Mbps and 2.048-Mbps interface modules have four-wire interfaces (one pair for the transmit line and one pair for the receive line). The line signal (which uses B8ZS coding for the G.703 1.544-Mbps interface and HDB3 for the 2.048-Mbps interface)contains sufficient timing information to allow the recovery of the clock signal from the received data.

  • Page 18: General Characteristics

    The Modular Modem Eliminator is a compact unit, intended for installation on a desktop or shelf. An adapter kit for mounting in 19” racks is available (part number RM518). The Modular Modem Eliminator is powered from 115-VAC (ME260A) or 230-VAC (ME260AE). Its power consumption is very low.

  • Page 19: Applications

    DCE/DTE switches of the plug-in modules are set in accordance with the function to be simulated by the Modular Modem Eliminator (DCE on the host side, DTE on the network side). Line V.35 X.21 64 kbps Modem ME260A Figure 2-6. V.35 port to X.21 modem interface-converter application.
  • Page 20 E1 digital network (transparent to 2.048 Mbps network with no need for framing). V.35 V.35 E1 Module E1 Module Module Module Digital Network ME260A ME260A Bridge with Bridge with V.35 Interface V.35 Interface Figure 2-7. Two DTEs connection via E1 network.

  • Page 21: Interfacing By General-Purpose Modules

    MODULAR MODEM ELIMINATOR 2.3.2 I NTERFACING BY ENERAL URPOSE ODULES Figure 2-8 shows a typical interface signals flow diagram for an interface converter application that uses two general-purpose interface modules. In this application, the mode jumper of the interface module connected to the DTE must be set to the DCE position, and the mode jumper of the other module must be set to the DTE position.

  • Page 22: Interfacing With 64-Kbps Codirectional Interface Module

    CHAPTER 2: Introduction 2.3.3 I (ME266C) NTERFACING WITH KBPS DIRECTIONAL NTERFACE ODULE Figure 2-9 shows a typical interface-signal flow diagram for an interface-converter application that uses a 64-kbps co-directional interface module in conjunction with a general-purpose interface module. This application allows the transfer of data to and from the DTE through a 64 kbps line.

  • Page 23: Interfacing With T1 Or E1 Interface Module

    MODULAR MODEM ELIMINATOR 2.3.4 I E1 I NTERFACING WITH NTERFACE ODULE Figure 2-10 shows a typical interface-signal flow diagram for an interface converter application that uses a T1 or E1 interface module in conjunction with a general- purpose interface module. This application allows the transfer of data to and from the DTE—for example, a bridge or a data multiplexor, through a T1 or E1 line.

  • Page 24: Modem-Eliminator Applications

    CTS line of the same interface. The delay is determined by an additional pair of jumpers, DELAY-1 and DELAY-2 (one for each interface). The available delay settings are 0, 6, and 51 msec. V.35 X.21 56 kbps 56 kbps ME260A Figure 2-11. Typical modem-eliminator application.
  • Page 25 MODULAR MODEM ELIMINATOR Timing Modes When set for operation in the modem eliminator configuration, the Modular Modem Eliminator offers two timing modes. The selection of the desired mode is made by an internal jumper: • Internal (INT) timing: the clock signals for the two DTEs are provided by the internal clock oscillator of Modular Modem Eliminator.
  • Page 26 CHAPTER 2: Introduction Figure 2-13 shows the flow of the clock signals in this mode, as well as the flow of interface control signals. DCE Mode DCE Mode External Clock Internal Clock Figure 2-13. Modem-eliminator application (showing the flow of clock and interface-control signals in the EXT timing mode).

  • Page 27: Elastic Buffer Applications

    MODULAR MODEM ELIMINATOR 2.4 Elastic-Buffer Applications In a typical elastic-buffer application, the Modular Modem Eliminator connects two DCEs that operate at the same nominal data rate, but use different timing sources. This means that data bits are clocked into the Modular Modem Eliminator at a rate slightly different from the rate at which the data is clocked out.
  • Page 28 CHAPTER 2: Introductions DTE Mode DTE Mode DCD-1 controls Buffer A Internal Clock Internal Clock DCD-2 controls Buffer B Figure 2-15. Elastic buffer application (data, check, and interface control signals diagram).

  • Page 29: Installation

    EQUIREMENTS Power The Modular Modem Eliminator should be installed within 5 feet (1.5 m) of an easily accessible grounded AC outlet capable of furnishing 115 VAC (for ME260A) or 230 VAC (for ME260AE). Data Channel Connections The Modular Modem Eliminator has two data channel interface connectors, one on each plug-in interface module.

  • Page 30: Configuration Information

    CHAPTER 3: Installation 3.2 Configuration Information 3.2.1 G ENERAL Before installing the Modem Eliminator, set the internal jumpers as explained below. This paragraph describes how the internal jumpers function, to help you select the correct setting for your particular application, and gives you step-by-step instructions for changing the position of these jumpers.

  • Page 31: Jumper Locations And Functions

    MODULAR MODEM ELIMINATOR 3.3.3 J UMPER OCATION AND UNCTIONS Modular Modem Eliminator jumpers are identified in Figure 3-2. CHASSIS GROUND CONNECT DISCONNECT MODE SELECT CARRIER-2 CARRIER-2 XMT-TIMING DELAY-1 0 ns 6 ns 51 ms DELAY-2 0 ns 6 ns 51 ms Figure 3-2.
  • Page 32 CHAPTER 3: Installation NOTE The functions of all the following jumpers are used only in the ME (modem eliminator) mode. CARRIER-2, JP5 (ME mode only) • ON—The DCD line in connector J2 is continuously on. • CTRL—The DCD line in connector J2 tracks the RTS line in connector J1. The Modular Modem Eliminator is shipped with the jumper set at ON.

  • Page 33: Setting The Jumpers

    MODULAR MODEM ELIMINATOR 3.2.4 S ETTING THE UMPERS CAUTION Disconnect the unit from the power line before removing cover. Avoid adjusting, maintaining, and repairing the opened Modem Eliminator under voltage as much as possible. When inevitable, repairs under voltage should be carried out only by a skilled person who is aware of the hazard involved.
  • Page 34 CHAPTER 3: Installation XMT TIMING INT CLK EX CLK LBT CLK G.703 E1/T1 64 kbps co-directional interface module interface module Figure 3-4. G.703 interface modules.

  • Page 35: Configuring Interface Modules

    MODULAR MODEM ELIMINATOR Configuring Interface Modules 3.3.1 G ENERAL URPOSE NTERFACE ODULES Each general-purpose interface module has a DTE/DCE selector, designated SW1. Figure 3-3 in Section 3.2.4 shows the position of the selector on each module, as well as the location of the module-type marking. Set the switch in accordance with the function implemented by the attached equipment.

  • Page 36: Installing Of Interface Modules

    CHAPTER 3: Installation 3.4 Installing Interface Modules As shown in Figure 3-5, the interface modules are held in place by two rails and are fastened by two captive screws to the rear panel. • To remove a module, release the two captive screws and pull the module out. •...

  • Page 37: Connecting The Cables

    MODULAR MODEM ELIMINATOR 3.5 Connecting the Cables 3.5.1 C ONNECTOR OCATION Figure 3-6 identifies the connectors located on the rear panel of the Modular Modem Eliminator. For information on connector wiring, refer to Appendix A. Fuse Compartment Connector J1 Connector J2 AC Power Connector Figure 3-6.

  • Page 38: Grounding

    CHAPTER 3: Installation 3.5.4 G ROUNDING Any interruption of the protective (grounding) conductor (inside or outside the instrument) or disconnecting the protective earth terminal can make this instrument dangerous. Intentional interruption is prohibited.

  • Page 39: Operation

    MODULAR MODEM ELIMINATOR 4. Operation 4.1 Front Panel Control and Indicators Figure 4-1. Front Panel. Table 4-1 lists the functions of the indicators and the rate selector on the front panel. Table 4-1. Controls and indicators. Control or Indicator Function PWR indicator Lights when the Eliminator is powered TD-1 indicator...

  • Page 40: Operating Instructions

    CHAPTER 4: Operation Table 4-1 (continued). Controls and indicators. Control or Indicator Function 6, 7, 8 MODE indicators The indicator corresponding to the selected operating mode lights: INT CONV Interface converter ELASTIC BUFFER Elastic buffer MODEM ELIM Modem eliminator RATE selector 16-position rotary data selector, activated via two buttons.

  • Page 41: Troubleshooting

    • Check that the cables between the Modular Modem Eliminator and the attached equipment are properly connected. 5.2 Calling Black Box If you determine that your Modular Modem Eliminator is malfunctioning, do not attempt to alter or repair the unit. It contains no user-serviceable parts. Contact Black Box Technical Support at 724-746-5500.

  • Page 42: Shipping And Packaging

    • If you are shipping the unit for repair, please include all parts of its external power supply. If you are returning the unit, please include everything you received with it. Before you ship the unit back to Black Box for repair or return, contact us to get a Return Authorization (RA) number.

  • Page 43: Appendix A: Interface Data

    MODULAR MODEM ELIMINATOR Appendix A: Interface Data A.1 General-Purpose Modules Table A-1 lists the line functions in the interface connectors of the Modular Modem Eliminator’s general-purpose plug-in modules. Table A-1. Plug-in module’s interface connectors (line functions). Description Abbr. Direction ITU V.35 V.36 (RS-449) ITU X.21 of Signal...
  • Page 44 APPENDIX A: Interface Data Table A-1 (continued). Plug-in module’s interface connectors (line functions). Description Abbr. Direction ITU V.35 V.36 ITU X.21 of Signal RS-232C V.24 Pin Type Pin Wire Circuit Abbr. Circuit Pin RS-232D V.35 Name CircuitPin V.36 Ring J Unbal Indicator Timing Transmit...

  • Page 45: Itu G.703 Balanced Interface Modules

    MODULAR MODEM ELIMINATOR A.2 ITU G.703 Balanced Interface Modules The G.703 balanced interface modules have a 15-pin D-type female connector, wired as shown in Table A-2. Table A-2. CCITT Rec. G703 pin connection. Function Transmit line Not used Receive line 4 through 8 Not used Transmit line...

  • Page 46: Appendix B: Calculation Of Elastic Buffer Over/Underflow Rate

    APPENDIX B: Calculation of Elastic Buffer Over/Underflow Rate Appendix B: Calculation of Elastic Buffer Over/Underflow Rate B.1 General An important consideration in many applications is bit count integrity (BCI). In synchronous data transmission systems, bits can be “lost” or “gained” when the receive clock rate is not equal to the transmit rate.
  • Page 47 MODULAR MODEM ELIMINATOR transmitted. Other conditions of interest are multiplexed 64-kbps channels transferred by digital multiplexors. When the digital multiplexors are synchronized by secondary atomic clocks, the expected worst-case clock rate difference is approximately 3 x 10 . In this case, the slippage rate achieved by the Modular Modem Eliminator is given by: Slippage Rate = 64 x 10 x 3 x 10...
  • Page 48 NOTES...
  • Page 49 NOTES...
  • Page 50 © Copyright 2000. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

This manual is also suitable for:

Me262cMe268cMe263cMe265cMe260aeMe261c ... Show all

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