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Blackbox LDL-MR19.2 Manual

19.2 kbps rs-232 line driver
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JULY 2000
ME760A-R2
ME760AE-R2
ME760C
19.2 kbps RS-232 Line Driver
(LDM-MR19.2)
9 . 2
- M R 1
L D M
R E M
A N A
D I G
T E S T
D C D
R D
T D
R T S
P W R
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

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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 is...
  • Page 3 LDM-MR19.2 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 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 LDM-MR19.2 TRADEMARK USED IN THIS MANUAL AS/400 is a registered trademark of International Business Machines Corporation. Any other trademarks mentioned in this manual are acknowlegded to be the property of the trademark owners.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS Contents Chapter Page 1. Specifications ..................... 6 2. Introduction ..................... 10 2.1 Functional Description ..............11 2.2 Applications ..................15 3. Standalone Installation ................18 3.1 Complete Package ................18 3.2 Physical Placement ................18 3.3 Data Cables ..................18 3.4 Setting the Internal Controls ............

  • Page 7: Specifications

    LDM-MR19.2 1. Specifications Compliance — FCC Part 15 Subpart J Class A, DOC Class/MDC classe A Cable Required — Between ME760 units: Unloaded twisted pair, 19 to 26 gauge; 4 wires for full duplex, at least 2 wires for half-duplex; DC continuity not required; Between standalone ME760 unit and DTE: TIA RS-232 cable with DB25 male connector on ME760 end Serial EIA RS-232-D/CCITT V.24, DCE...
  • Page 8 CHAPTER 1: Specifications Controlled by RTS or constantly ON (user-selectable) Carrier — Maximum Transmission See Table 1-1 on page 11 Distance — User Controls — (3 or 4) Front-mounted pushbuttons: DIG (local digital loopback); ANA (local analog loopback); REM (remote digital loopback); ME760C only: RPF (reset after remote power failure);...
  • Page 9 LDM-MR19.2 (6 or 7) Front-mounted LEDs: PWR (power), RTS, TD, Indicators — RD, DCD, TEST, and (ME760C only) RPF (remote power failure) (2) Rear-mounted: (1) DB25 for cable to DTE, Connectors — (1) 4-wire terminal block for modem-to-modem line Power — Directly from outlet through detachable 5-ft.
  • Page 10 CHAPTER 1: Specifications Table 1-1. Maximum Transmission Distance SPEED 19 AWG 24 AWG 26 AWG (bps) 19,200 14 mi. (22.5 km) 6.2 mi. (10 km) 4.6 mi. (7.5 km) 14,400 15.2 mi. (24.5 km) 6.8 mi. (11 km) 5.1 mi. (8.2 km) 9,600 18 mi.

  • Page 11: Introduction

    LDM-MR19.2 2. Introduction The 19.2 kbps RS-232 Line Driver (LDM-MR19.2 for short) is a short-range modem which operates at full- or half-duplex with synchronous or asynchronous transmission over unconditioned telephone lines. With an extended range of up to 34 miles (55 km), the LDM-MR19.2 operates at any of eight selectable data rates, up to 19,200 bps.

  • Page 12: Functional Description

    CHAPTER 2: Introduction 2.1 Functional Description This section contains functional descriptions of the LDM-MR19.2’s circuit blocks (primarily the circuits required for correctly configuring the unit). 2.1.1 E NCODER The encoder modulates the input data from the DTE using the “conditional diphase modulation”...
  • Page 13 LDM-MR19.2 2.1.3 A SYNC ONVERTER The LDM-MR19.2 provides internal conversion from async to sync in compliance with CCITT V.22 bis. According to this standard, frequency deviation between the modem and the DTE is compensated for by shortening or lengthening the stop bit of the async character.
  • Page 14 CHAPTER 2: Introduction 2.1.5 R ECEIVER The receiver contains several circuits (shown in Figure 2-1 below): • The RECEIVE FILTER removes all the out-of-band frequencies. • The AUTOMATIC EQUALIZER is made up of several equalizers activated according to data rate. •...
  • Page 15 LDM-MR19.2 However, there is a difference in multipoint applications, where the master modem communicates with modems at different distances. When the master modem is set to AGC-ON, the master can communicate across long distances (up to its maximum range) to the slave modems. However, this setting increases the RTS-to-CTS delay.

  • Page 16: Applications

    CHAPTER 2: Introduction 2.1.6 V.54 D IAGNOSTICS You can activate V.54 loops with either the front-panel pushbuttons or Pins 18 and 21 of the V.24/ RS-232 interface. The pushbuttons, Pin 18, and Pin 21 can be enabled or disabled separately by the SWITCH, PIN 18, and PIN 21 jumpers, respectively.
  • Page 17 LDM-MR19.2 4-wire twisted pair, up to 34 mi. (55 km) LDM-MR19.2 LDM-MR19.2 PC running emulation software AS/400 ® A/S 400 Figure 2-2. Point-to-point application. SLAVE 1 XMT IMP.-150Ω RCV IMP.-HIGH LDM-MR19.2 LDM-MR19.2 MASTER XMT IMP.-LOW RCV IMP.-150Ω SLAVE 2 XMT IMP.-150Ω AS/400 A/S 400 RCV IMP.-HIGH...
  • Page 18 CHAPTER 2: Introduction LDM-MR19.2: LDM-MR19.2: RCV CLOCK, EXT CLOCK, V.54 DLY–OFF V.54 DLY–ON PC running CSU/DSU 5250 emulation software Cross-pinned cable such as our EYN255C DIGITAL SERVICE NETWORK CSU/DSU AS/400 LDM-MR19.2: LDM-MR19.2: EXT CLOCK, RCV CLOCK, V.54 DLY–ON V.54 DLY–OFF Figure 2-4.

  • Page 19: Standalone Installation

    LDM-MR19.2 3. Standalone Installation Follow the directions in this chapter to install the standalone version of the LDM-MR19.2. Once you’ve done this, see Chapter 5 for operating information. 3.1 Complete Package With your LDM-MR19.2 order, you should have received (1) LDM-MR19.2, (1) detachable 5-ft.
  • Page 20 CHAPTER 3: Standalone Installation The terminal block holds five crimp-style contact positions for connecting the Transmit (XMT) and Receive (RCV) telephone lines. The Transmit and Receive pairs are not polarity-sensitive. Using a screwdriver to gently lever open the contacts, connect the Transmit pair to the XMT terminals; for 2-wire operation, this is all you need.
  • Page 21 LDM-MR19.2 Table 3-1. DB25 Pinout and Interface-Signal List (continued) CCITT SIGNAL V.24 RS-232-C NAME DESCRIPTION Receive Line The LDM-MR19.2 always sends a “high” Signal Detector (positive) level to the local DTE except when (Carrier Detect) the LDM-MR19.2 detects carrier loss or is in local or remote digital loopback.

  • Page 22: Setting The Internal Controls

    CHAPTER 3: Standalone Installation 3.4 Setting the Internal Controls After you install the cabling, you’ll need to configure the LDM-MR19.2 for your application by setting its internal straps (jumpers) and switches as necessary. The numbers listed under the “Strap Identity” column in Table 3-2 on the next two pages correspond to the numbered strap locations in Figure 3-2 on page 27.
  • Page 23 LDM-MR19.2 Table 3-2. Strap Selection, Standalone Version Strap Identity Function Possible Standard Settings Factory Settings No. 1 Determines the data rate. 0 = 19.2 Kbps DATA RATE 1 = 14.4 Kbps (Kbps) 2 = 9.6 Kbps 2 = 9.6 Kbps 3 = 7.2 Kbps 4 = 4.8 Kbps 5 = 3.6 Kbps...
  • Page 24 CHAPTER 3: Standalone Installation Table 3-2. Strap Selection, Standalone Version (continued) Strap Identity Function Possible Standard Settings Factory Settings No. 11 Enables/disables control of the DIG, SWITCH ANA, and REM loopbacks with the front-panel pushbuttons. No. 12 CONN.: Connects Signal Ground to CONNECT CONNECT CHAS GND...
  • Page 25 LDM-MR19.2 Table 3-3. Async Character-Length Setting Start Bit Data Bits Parity Stop Bit(s) Total Bits Always 1 NONE ODD OR EVEN 1 or 1.5 NONE 1 or 1.5 ODD OR EVEN 1 or 1.5 NONE 1 or 1.5 ODD OR EVEN 1 or 1.5 NONE 1 or 1.5...
  • Page 26 CHAPTER 3: Standalone Installation LEDs V54 DLY ASY LENGTH 2/4 WIRE DATA RATE CNTRL 1 2 3 4 CARRIER XMT TIMING CNTRL INT.CK EXT.CK RCV.CK ASYNC CTS DELAY 0 msec 8 msec 64msec XMT LEVEL 0dbm -3dbm -6dbm -9dbm XMT IMPD RCV IMPD PIN 21 PIN 18...

  • Page 27: Card Installation

    LDM-MR19.2 4. Card Installation The ME760C is a card version of the LDM-MR19.2 that can be easily installed in our RackNest 2/14. Its front-panel indicators and controls are arranged vertically rather than horizontally, but (with the exception of its “extra” RPF LED and reset button) they work exactly the same way as the indicators and controls with the same names on the front panels of the standalone ME760A-R2 and ME760AE-R2 units;...

  • Page 28: The Racknest 2/14'S Power Supply

    CHAPTER 4: Card Installation 4.2 The RackNest 2/14’s Power Supply The 115-VAC RackNest 2/14 (our product code RM110A) uses the PS1000A power supply, which accepts 115-VAC input power. The 230-VAC RackNest 2/14 (our product code RM110AE) uses power supply PS1000AE, which accepts 230-VAC input power.

  • Page 29: The Racknest 2/14 Illustrated

    LDM-MR19.2 4.3 The RackNest 2/14 Illustrated You will be installing the LDM-MR19.2 card in the RackNest 2/14 as shown in Figure 4-1 below. The front and rear panels of the Nest are shown in Figure 4-2 on the next page; the numbered connectors, controls, and indicators are described in Table 4-1 on page 32.
  • Page 30 CHAPTER 4: Card Installation XMIT Figure 4-2. The RackNest 2/14 illustrated.
  • Page 31 LDM-MR19.2 Table 4-1. Descriptions of RackNest 2/14 Components Item Control, Indicator, or Connector Function Card Slots Slots for installation of compatible cards (slot no. 1 located at the left-hand side). Unused slots are closed with blank panels. Power-Supply Module Provides power to modules installed in the enclosure.

  • Page 32: Card-Configuration Procedure

    CHAPTER 4: Card Installation 4.4 Card-Configuration Procedure Before putting the LDM-19.2 card in the RackNest 2/14 or attaching anything to the Card, determine which data rate you’re going to use and how you want to set all of the other user-configurable options on the Card. (Refer to Table 4-2 on the next two pages for a list of all of these options;...
  • Page 33 LDM-MR19.2 Table 4-2. Strap Selection, Card Version Strap Identity Function Possible Standard Settings Factory Settings No. 1 Determines the data rate. 0 = 19.2 Kbps DATA RATE 1 = 14.4 Kbps (Kbps) 2 = 9.6 Kbps 2 = 9.6 Kbps 3 = 7.2 Kbps 4 = 4.8 Kbps 5 = 3.6 Kbps...
  • Page 34 CHAPTER 4: Card Installation Table 4-2. Strap Selection, Card Version (continued) Strap Identity Function Possible Standard Settings Factory Settings No. 11 Enables/disables control of the DIG, SWITCH ANA, and REM loopbacks with the front-panel pushbuttons. No. 12 CONNECT: Connects Signal Ground CONNECT CONNECT to Chassis Ground.
  • Page 35 LDM-MR19.2 LEDs V54 DLY ASY LENGTH 2/4 WIRE DATA RATE CNTRL 1 2 3 4 CARRIER XMT TIMING CNTRL INT.CK EXT.CK RCV.CK ASYNC CTS DELAY 0 msec 8 msec 64msec XMT LEVEL 0dbm -3dbm -6dbm -9dbm XMT IMPD RCV IMPD PIN 21 PIN 18 HIGH...

  • Page 36: Card-Installation Procedure

    CHAPTER 4: Card Installation 4.5 Card-Installation Procedure After you install the RackNest 2/14 in your 19” rack (refer to the Nest’s manual), take these steps to install an LDM-MR19.2 card in the Nest: 1. Insert the Card into an empty slot on the Nest (see Figure 4-1 on page 30). Do not use excessive force.

  • Page 37: Operation

    LDM-MR19.2 5. Operation This chapter describes the LDM-19.2’s controls and indicators, operating procedures, and strapping information. Be sure you finish installing the LDM-MR19.2 (refer to Chapter 3 for the standalone or Chapter 4 for the card version) before you attempt to operate it. 5.1 Controls and Indicators All of the LDM-MR19.2’s external controls and LED indicators are located on the unit’s front panel, as shown in Figure 5-1 below (standalone) or Figure 5-2 on the...
  • Page 38 CHAPTER 5: Operation TEST Figure 5-2. The LDM-MR19.2 card’s front panel.
  • Page 39 LDM-MR19.2 Table 5-1. Controls ITEM CONTROL FUNCTION Pressng the Digital Loopback button causes the local LDM-MR19.2 to loop received data and clock to its transmitter. Data Set Ready goes low. Pressing the Analog Loopback (V.54 Loop) button causes the local LDM-MR19.2 to loop its transmitter output back to its receiver.

  • Page 40: Turning The Unit On

    CHAPTER 5: Operation 5.2 Turning the Unit ON If you haven’t already, plug the AC power cord of the LDM-MR19.2 itself (for standalone units) or the RackNest 2/14 (for card units) into a working AC outlet. The PWR LED should light to indicate that the LDM-MR19.2 is ON. If the local and remote LDM-MR19.2 units are both operating and passing data, the LEDs should look like this: •...

  • Page 41: Turning The Unit Off

    LDM-MR19.2 The card’s RPF circuitry will detect this tone, light the card’s RPF LED, and stop the card from making any further attempts to communicate with the standalone. When you see that the card’s RPF LED is lit, check the remote site; when power has been restored, push the card’s RPF button to turn the LED off and to reset the card for normal operation.

  • Page 42: Troubleshooting

    CHAPTER 6: Troubleshooting 6. Troubleshooting This chapter contains information about how to test your system, how to isolate faults, and what to do when you find problems. 6.1 Loopback Testing With the LDM-MR19.2’s test switches and LEDs, you can rapidly check the unit itself and its attached data terminals and telephone lines.
  • Page 43 LDM-MR19.2 PRESSED XMTR DATA TERMINA RCVR Figure 6-1. A local LDM-MR19.2 in analog loopback. 6.1.2 C OMMUNICATION ESTS IGITAL OOPBACK 6.1.2.A Remote Digital Loopback Use the Remote Digital Loopback test to check the performance of both the local and the remote LDM-MR19.2 and the lines between them (see Figure 6-2 on the next page).
  • Page 44 CHAPTER 6: Troubleshooting PRESSED DATA XMTR RCVR LOCAL REMOTE DATA DATA TERMINAL TERMINAL DATA RCVR XMTR Figure 6-2. A remote LDM-MR19.2 in digital loopback. PRESSED DATA XMTR RCVR REMOTE LOCAL DATA DATA TERMINAL TERMINAL DATA RCVR XMTR Figure 6-3. A local LDM-MR19.2 in digital loopback.

  • Page 45: Calling Black Box

    LDM-MR19.2 6.2 Calling Black Box If you determine that your LDM-MR19.2 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. Before you do, make a record of the history of the problem. We will be able to provide more efficient and accurate assistance if you have a complete description, including: •...
  • Page 46 ©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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