SEPTEMBER 2002 ME760A-R2 ME760AE-R2 ME760C 19.2 kbps RS-232 Line Driver (LDM-MR19.2) CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX 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 Web site: www.blackbox.com • E-mail: info@blackbox.
FCC AND IC STATEMENTS FEDERAL COMMUNICATIONS COMMISSION AND 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.
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. 3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4. Todas las instrucciones de operación y uso deben ser seguidas. 5.
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. 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13.
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.
TABLE OF CONTENTS Contents Chapter Page 1. Specifications ............................................................................................. 6 2. Introduction ............................................................................................. 10 2.1 Functional Description ..................................................................... 11 2.2 Applications ....................................................................................... 15 3. Standalone Installation ...
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 Interface — Serial EIA RS-232-D/CCITT V.
CHAPTER 1: Specifications Carrier — Controlled by RTS or constantly ON (user-selectable) Maximum Transmission Distance — See Table 1-1 on page 11 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); (15 or 16) Internal: (1) Dial for data rate; (1) Four-position DIP switch for async character length and stop-bit shortening; (13 or 14) Jumpers: Transmit timing; 2-
LDM-MR19.2 Indicators — (6 or 7) Front-mounted LEDs: PWR (power), RTS, TD, RD, DCD, TEST, and (ME760C only) RPF (remote power failure) Connectors — (2) Rear-mounted: (1) DB25 for cable to DTE, (1) 4-wire terminal block for modem-to-modem line Power — Directly from outlet through detachable 5-ft. (1.5-m) line cord and rear-mounted IEC 320 male inlet: ME760A: 115 VAC, 47 to 63 Hz, 3 watts; input cord terminated with N.
CHAPTER 1: Specifications Table 1-1. Maximum Transmission Distance. SPEED (bps) 19 AWG 24 AWG 26 AWG 19,200 6 mi. (9.8 km) 4 mi. (6.5 km) 2.7 mi. (4.4 km) 14,400 7.5 mi. (12.1 km) 5 mi. (8.1 km) 3.4 mi. (5.4 km) 9,600 9.8 mi. (15.8 km) 6.5 mi. (10.5 km) 7,200 10.5 mi. (17.3 km) 7 mi. (11.5 km) 4.7 mi. (7.7 km) 4,800 13.5 mi. (21.8 km) 9 mi. (14.5 km) 6 mi. (9.7 km) 3,600 15 mi. (24 km) 10 mi. (16 km) 6.7 mi. (10.7 km) 2,400 16.5 mi. (27 km) 11 mi. (18 km) 7.4 mi.
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. By using conditioned differential diphase modulation (Eurocom Std. D1), the LDM-MR19.
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 ENCODER The encoder modulates the input data from the DTE using the “conditional diphase modulation” technique. You can configure the encoder to operate in one of five modes: • 4-wire full-duplex • 4-wire half-duplex • 2-wire half-duplex • 4-wire multipoint • 2-wire multipoint 2.1.
LDM-MR19.2 2.1.3 ASYNC-TO-SYNC CONVERTER 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. When the modem’s frequency is higher than the DTE’s, the local converter extends the stop bit.
CHAPTER 2: Introduction 2.1.5 RECEIVER 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. • The digital AGC (automatic gain control) automatically compensates for the attenuation of the line. You can choose between the two modes of AGC operations by setting the AGC jumper: ON: The AGC operates continuously.
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. For example, under AGC-ON, the CTS delay of all slaves must be set to 64 ms when the data rate is less than 9.6 Kbps.
CHAPTER 2: Introduction 2.1.6 V.54 DIAGNOSTICS 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. When you use the LDM-MR19.2 as a tail end to a DDS network, set the V.54 DELAY jumpers of the modems located close to the DDS network to ON to prevent multiple loopbacks.
LDM-MR19.2 4-wire twisted pair, up to 34 mi. (55 km) LDM-MR19.2 LDM-MR19.2 PC running PC emulation software ® AS/400 A/S 400 Figure 2-2. Point-to-point application. LDM-MR19.2 LDM-MR19.2 SLAVE 1 XMT IMP.-150Ω RCV IMP.-HIGH LDM-MR19.2 SLAVE 2 XMT IMP.-150Ω RCV IMP.-HIGH LDM-MR19.2 SLAVE 3 XMT IMP.-150Ω RCV IMP.-HIGH LDM-MR19.2 SLAVE N XMT IMP.-150Ω RCV IMP.-150Ω MASTER XMT IMP.-LOW RCV IMP.-150Ω AS/400 A/S 400 Figure 2-3. Multipoint application.
CHAPTER 2: Introduction LDM-MR19.2: RCV CLOCK, V.54 DLY–OFF PC running 5250 emulation software LDM-MR19.2: EXT CLOCK, V.54 DLY–ON CSU/DSU Cross-pinned cable such as our EYN255C DIGITAL SERVICE NETWORK CSU/DSU AS/400 Figure 2-4. Tail circuit for DDS application. The XMT and RCV impedances of all the LDM-MR19.2s in this application would be set to 150 ohms. MASTER LDM-MR19.2 SLAVE LDM-MR19.2 Controller SLAVE LDM-MR19.2 Controller SLAVE LDM-MR19.2 Controller AS/400 Figure 2-4.
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. (1.5-m) AC power cord, and (1) copy of this manual. The LDM-MR19.2 is fully assembled at the factory. You don’t have to assemble any part of the unit.
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.
LDM-MR19.2 Table 3-1. DB25 Pinout and Interface-Signal List (continued) CCITT V.24 EIA RS-232-C DTE PIN SIGNAL NAME 109 CF 8 Receive Line Signal Detector (Carrier Detect) The LDM-MR19.2 always sends a “high” (positive) level to the local DTE except when the LDM-MR19.2 detects carrier loss or is in local or remote digital loopback. 113 DA 24 External Trans. Signal Element Timing Synchronous data-rate-clock input received from the local DTE. Governs the Transmitted Data signal.
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. CAUTION! Be sure the LDM-MR19.2 is unplugged before you open it.
LDM-MR19.2 Table 3-2. Strap Selection, Standalone Version 22 Strap Identity Function Possible Settings Standard Factory Settings No. 1 DATA RATE (Kbps) Determines the data rate. 0 = 19.2 Kbps 1 = 14.4 Kbps 2 = 9.6 Kbps 3 = 7.2 Kbps 4 = 4.8 Kbps 5 = 3.6 Kbps 6 = 2.4 Kbps 7 = 1.2 Kbps No. 2 XMT TIMING Determines whether the transmit-timing signal comes from the internal clock, external clock, or receive clock, or whether the unit operates in async. INT EX RCV ASY No.
CHAPTER 3: Standalone Installation Table 3-2. Strap Selection, Standalone Version (continued) Strap Identity Function Possible Settings Standard Factory Settings No. 11 SWITCH Enables/disables control of the DIG, ANA, and REM loopbacks with the front-panel pushbuttons. DIS EN EN No. 12 CHAS GND CONN.: Connects Signal Ground to Chassis Ground. DIS.: Isolates grounds from each other. CONNECT DIS CONN CONNECT No. 13 AGC ON: AGC always ON.
LDM-MR19.2 Table 3-3. Async Character-Length Setting Start Bit Always 1 Data Bits Parity Total Bits 5 NONE ODD OR EVEN 2 1 or 1.5 2 8 8 9 6 NONE 1 or 1.5 2 1 or 1.5 2 8 9 9 10 1 or 1.5 2 1 or 1.5 2 9 10 10 11 1 or 1.5 2 1 or 1.
CHAPTER 3: Standalone Installation Figure 3-2. The standalone LDM-MR19.2’s board layout.
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; refer to Section 5.1.
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. Each of these power supplies consists of a power-line transformer, a fuse, and an operating switch.
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. Figure 4-1. The RackNest 2/14: Card installation.
CHAPTER 4: Card Installation ON 2 1 3 4 6 GND RCV XMIT 5 7 Figure 4-2. The RackNest 2/14 illustrated.
LDM-MR19.2 Table 4-1. Descriptions of RackNest 2/14 Components Item Control, Indicator, or Connector Function 1 Card Slots Slots for installation of compatible cards (slot no. 1 located at the left-hand side). Unused slots are closed with blank panels. 2 Power-Supply Module Provides power to modules installed in the enclosure. 3 ON Indicator Lights when power supply is operating. 4 Chassis-Ground Terminal Connector for attaching other grounds, devices, etc.
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; the SWn and Jn numbers in the table’s “Element” column correspond to the locations with the same numbers in Figure 4-1 on page 36.
LDM-MR19.2 Table 4-2. Strap Selection, Card Version 32 Strap Identity Function Possible Settings Standard Factory Settings No. 1 DATA RATE (Kbps) Determines the data rate. 0 = 19.2 Kbps 1 = 14.4 Kbps 2 = 9.6 Kbps 3 = 7.2 Kbps 4 = 4.8 Kbps 5 = 3.6 Kbps 6 = 2.4 Kbps 7 = 1.2 Kbps No. 2 XMT TIMING Determines whether the transmit-timing signal comes from the internal clock, external clock, or receive clock, or whether the unit operates in async. INT EX RCV ASY No.
CHAPTER 4: Card Installation Table 4-2. Strap Selection, Card Version (continued) Strap Identity Function Possible Settings Standard Factory Settings No. 11 SWITCH Enables/disables control of the DIG, ANA, and REM loopbacks with the front-panel pushbuttons. DIS EN EN No. 12 GND CONNECT: Connects Signal Ground to Chassis Ground. DIS: Isolates grounds from each other. CONNECT DIS CONN CONNECT No. 13 AGC ON: AGC always ON.
LDM-MR19.2 Figure 4-3. The LDM-MR19.2 card’s board layout.
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. If the Card does not go in easily, remove the Card, realign it with the Nest’s enclosure guides, and push it into place.
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 next page (card).
CHAPTER 5: Operation 1 2 3 4 5 6 7 D A B C Figure 5-2. The LDM-MR19.2 card’s front panel.
LDM-MR19.2 Table 5-1. Controls ITEM CONTROL FUNCTION A DIG 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. B ANA Pressing the Analog Loopback (V.54 Loop) button causes the local LDM-MR19.2 to loop its transmitter output back to its receiver. This loopback can also be activated from the terminal when the Pin 18 strap (strap #9) is set to EN (see Section 3.4). C REM Pressing the Remote Digital Loopback (V.
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.
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.
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. Use the checkout procedures described in this section to verify normal system operation and isolate faulty equipment in the event of failure.
LDM-MR19.2 ALB PRESSED DAT CL XMTR DATA TERMINA CL DAT RCVR LIN Figure 6-1. A local LDM-MR19.2 in analog loopback. 6.1.2 COMMUNICATION-LINK TESTS: DIGITAL LOOPBACK 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). Take these steps: 1. Press the REM (Remote Loopback) pushbutton on the front panel of the unit you want to test. The TEST LED should light.
CHAPTER 6: Troubleshooting RLB PRESSED DATA CLK XMTR RCVR LOCAL REMOTE DATA TERMINAL DATA TERMINAL CLK DATA RCVR XMTR Figure 6-2. A remote LDM-MR19.2 in digital loopback. DIG PRESSED DATA XMTR CLK RCVR REMOTE LOCAL DATA TERMINAL DATA TERMINAL DATA CLK RCVR XMTR Figure 6-3. A local LDM-MR19.2 in digital loopback.
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: • the nature and duration of the problem. • when the problem occurs. • the components involved in the problem.
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