MARCH 2004 ME444A-R3 ME444AE-R3 ME444A-530-R3 ME444AE-530-R3 ME445C-35 ME445C-530 ME445C-X.21 256-kbps Line Driver (V.35, RS-530, or X.21) CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.
FCC AND IC RFI 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.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Safety Warnings Always observe standard safety precautions during installation, operation, and maintenance of this product. Only qualified and authorized service personnel should adjust, maintain, or repair this instrument. Do not attempt to adjust, maintain, or repair the equipment. Telecommunication Safety The safety status of each of the ports on the line driver appears below: Ports Safety Status V.24, V.35, V.36, X.
Declaration of Conformity/Supplementary Information Declaration of Conformity The line driver conforms to the following standard(s) or other normative document(s); EMC: Safety: EN 55022 (1994) Limits and methods of measurement of radio disturbance characteristics of information technology equipment. EN 50082-1 (1992) Electromagnetic compatibility— Generic immunity standards for residential, commercial, and light industry.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 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.
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. 14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante. 15.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) TRADEMARKS USED IN THIS MANUAL AS/400 and IBM are registered trademarks of International Business Machines Corporation. Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
CONTENTS Contents Chapter Page 1. Specifications ............................................................................................. 8 2. Introduction ...............................................................................................10 2.1 Physical Description ............................................................................10 2.2 Functional Description ..................................................................... 11 2.2.1 Encoder Modulator ...................
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 1. Specifications Compliance: FCC Class A, IC Class/classe A Protocol: Synchronous or asynchronous Clock Source: Internal, external (from attached device), or receive clock derived from the receive signal Flow Control: None Operation: 4-wire, full- or half-duplex, point-to-point or multipoint Data Rate: Sync: 19.2, 32, 48, 56, 64, 72, 96, 112, 128, 144, 192, or 256 kbps (user-selectable); Async: 19.2, 28.8, 38.4, 57.6, or 115.
CHAPTER 1: Specifications Maximum Altitude: 8000 ft. (2438.4 m) Enclosure: High-impact plastic Power: ME444A-R3: Directly from outlet through detachable 5-ft. (1.5-m) power cord (included); Optimal input: 115 VAC, 60 Hz; Input ranges: 103.5 to 126.5 VAC, 47 to 63 Hz; Consumption: 5 watts; ME444AE-R3: Directly from outlet through detachable 5-ft. (1.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 2. Introduction The 256-kbps Line Driver is a short-range modem for synchronous or asynchronous transmission—full- or half-duplex—over unconditioned lines. With a range of up to 11.8 miles (19 km), the line driver operates at user-selectable synchronous data rates from 19.2 to 256 kbps or asynchronous data rates from 19.2 to 115.2 kbps. The line driver is available in standalone V.35 or RS-530 (ME444A/E-R3) or rackmount card V.35, RS-530, or X.
CHAPTER 2: Introduction 2.2 Functional Description This section describes the operation of the line driver’s circuit blocks, primarily the circuits required for correctly configuring the modem (see Figure 2-1 below). Figure 2-1. Line driver block diagram. 2.2.1 ENCODER MODULATOR The encoder modulator receives data from the DTE, then modulates the data using the “conditional diphase modulation” technique.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) NOTE In multipoint applications, do not use the 0-msec option for the RTS–CTS delay. 2.2.2 MODULATION TIMING This circuit supplies the transmit clock to the encoder. Three clock sources are available on the XMT CLK jumper (J3): • INT—Internal clock. From the modem’s internal crystal oscillator. • EXT—External clock. From DTE. • RCV—Receive clock. Recovered from the receive signal.
CHAPTER 2: Introduction 2.2.5 V.54 DIAGNOSTICS V.54 loops are activated manually with the front-panel buttons, or through the DTE interface. The buttons and the DTE interface can be enabled or disabled separately by jumpers J7 and J8 (shown in Figure 3-1 and described in Table 3-1). When you use the line driver as a tail-end to a digital network, the V.54 DLY jumper in the modems located close to the network should be set to ON to prevent multiple loopbacks.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 4-wire twisted pair DDS (56 kbps) CSU/DSU External clock CSU/DSU Sync host 256-kbps Line Driver Receive clock 256-kbps Line Driver Sync host Tail circuit Figure 2-3. Tail-circuit application. V.35 interface V.35 interface V.35 cable 4-wire twisted pair (64 kbps) V.35 cable 256-kbps Line Driver IBM® S/3X mainframe V.35 interface IBM 3274 controller V.35 cable 256-kbps Line Driver V.35 interface IBM 3274 controller V.
CHAPTER 3: Configuration 3. Configuration This chapter explains how to configure your standalone or rackmount card line driver. After you configure it, see Chapter 4 for how to install it, Chapter 5 for how to operate it, and Chapter 6 for how to test the system. 3.1 Placement of the Standalone Version Place the 256-kbps Line Driver standalone model within 5 ft. (1.5 m) of a grounded, easily accessible AC outlet.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) DESCRIPTION OF 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 uses power supply PS1000AE, which accepts 230-VAC input power. Each of these power supplies consists of a power-line transformer and a fuse.
CHAPTER 3: Configuration 3.3 Configuring the Standalone or Card Version Before attaching anything to the 256-kbps Line Driver standalone or rackmount card version, determine which data rate you’re going to use, what the system’s clock source should be, and how you want to set all of the other user-configurable options on the line driver.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Table 3-1 (continued). User-configurable options. Element Function Possible Settings Standard Factory Setting J4 RTS-CTS DLY jumper Select the delay in milliseconds that occurs during RTS-to-CTS transitions. Do not select 0 for multipoint applications. 0 9 70 J5 V54 DLY jumper Turn V.54 delay ON or OFF. When you turn it ON, V.54 delay prevents multiple loopback of tail-end circuits. ON OFF J6 SW. EN.
CHAPTER 3: Configuration Figure 3-1. Layout of the 256-kbps Line Driver circuit board.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) When you have everything at least tentatively decided, take these steps to set the unit’s internal controls. CAUTION! Disconnect the standalone line driver from the power line before removing it from its housing. WARNING: HIGH VOLTAGE! Any adjustment, maintenance, and repair of the open instrument under voltage should be avoided as much as possible, and, when inevitable, should be carried out only by a skilled person who is aware of the hazard involved.
CHAPTER 4: Installation 4. Installation 4.1 Installing the Standalone Version in 19-Inch Racks 4.1.1 OVERVIEW The 256-kbps Line Driver standalone version can be installed in 19-inch racks. It is 1U (1.75", 4.4 cm) high and is slightly less than half as wide as the available mounting area. Two rack-adapter kits are available as special quotes: One kit provides the hardware necessary to install a single unit, and the other provides the hardware necessary to install two units side by side. Sections 4.1.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Figure 4-1. Installing a single unit in a 19-inch rack. 4.1.3 INSTALLING TWO STANDALONE UNITS IN A 19-INCH RACK The adapter kit includes two long side rails (one for each unit), which slide into each other to fasten the units together, and two short side brackets, which hold the two line drivers side by side in a 19-inch rack. Refer to Figure 4-2 when you perform the following procedure: 1.
CHAPTER 4: Installation 4. Secure the included plastic caps to the ends of the rails, to protect the rail ends and prevent the units from moving. 5. You can now use four screws (not supplied with the kit), two on each side, to fasten the assembled units to the side rails of the 19-inch rack. Figure 4-2. Installing two units in a 19-inch rack.
6-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 4.2 Installing the 256-kbps Line Driver Rackmount Card Version THE RACKNEST 2/14 ILLUSTRATED You will be installing the line driver card in the RackNest 2/14 as shown in Figure 4-3. The front and rear panels of the RackNest are shown in Figure 4-4; the numbered connectors, controls, and indicators are described in Table 4-1. Figure 4-3. Installing a card in the RackNest 2/14.
CHAPTER 4: Installation ON 2 1 3 4 6 GND RCV XMIT 5 7 Figure 4-4. The RackNest 2/14 illustrated.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Table 4-1. Descriptions of RackNest 2/14 components. Item Control, Indicator, or Connector 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: Installation After you install the RackNest 2/14 in your 19" rack (refer to the RackNest’s manual), take these steps to install a line driver card in the RackNest: 1. Insert the card into an empty slot on the RackNest (see Figure 4-3). Do not use excessive force. If the card does not go in easily, remove the card, realign it with the RackNest’s enclosure guides, and push it into place.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 6. Run twisted-pair cable between the local and remote cards. Attach one pair of wires to the corresponding XMT terminals (“TB1”) on the back of the local RackNest and the corresponding RCV terminals on the remote RackNest; attach the other pair of wires to the RCV terminals on the local RackNest and the XMT terminals on the remote RackNest. (It doesn’t matter which wire in each pair goes to which terminal in each pair; the cards autosense parity.
CHAPTER 4: Installation Table 4-2. Pinout of the RackNest 2/14’s DB25 connector when ME445C-530 is installed or RS-530 standalone’s DB25 connector. SIGNAL NAME (ABBREV.) ITU-TSS CIRCUIT LEAD TYPE DB25 PIN Shield (SHD) 101 1 Signal Ground (SGND) 102 7 Transmitted Data (TD) 103 A B 2 14 Received Data (RD) 104 A B 3 16 Request to Send (RTS) 105 A B 4 19 Clear to Send (CTS) 106 A B 5 13 DCE Ready (DCR) a.k.a.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Table 4-3. Pinout of the RackNest 2/14’s DB25 connector when ME445C-35 is installed. SIGNAL NAME (ABBREV.) ITU-TSS CIRCUIT LEAD DB25 M/34 TYPE (RACK- (NORM. NEST) V.
CHAPTER 4: Installation Table 4-4. Pinout of the V.35 standalone’s M/34 connector. SIGNAL NAME (ABBREV.) ITU-TSS CIRCUIT LEAD TYPE V.35 PIN Frame (Protective) Ground (FGND) 101 A Signal Ground (SGND) 102 B Send Data (SD) 103 A B P S Receive Data (RD) 104 A B R T Request to Send (RTS) 105 C Clear to Send (CTS) 106 D Data Set Ready (DSR) 107 E Data Terminal Ready (DTR) 108 H Received Line Signal Detector (RLSD), a.k.a.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Table 4-5. Pinout of the RackNest 2/14’s DB25 connector when ME445C-X21 is installed. SIGNAL NAME (ABBREV.) ITU-TSS CIRCUIT LEAD DB25 DA15 TYPE (RACK- (NORM. NEST) X.21) PIN* PIN Shield (n/a) 101 1 1 Ground (G) a.k.a. Signal Ground (SGND) 102 7 8 Transmit (T) 103 A B 2 14 2 9 Receive (R) 104 A B 3 16 4 11 Control (C) a.k.a. Request to Send (RTS) 105 A B 4 19 3 10 Indication (I) a.k.a.
CHAPTER 4: Installation 4.3 Connecting Data Cables After you set the standalone line driver’s internal controls, it’s ready to be cabled for operation. Its electrical connectors are located on its rear panel. These consist of a female V.35 interface connector labeled “DTE,” a 5-screw terminal block, and an IEC 320 AC inlet that contains an integral fuse compartment. The V.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) fuse rated for the required amount of current. You must avoid using repaired fuses or short-circuiting the fuse holders. The fuse, and one replacement fuse, are located in the top part of the mains connector on the line driver’s rear panel. The nominal current value of the fuse is 0.125 A for 230-VAC operation or 0.25 A for 115-VAC operation.
CHAPTER 4: Installation To connect the line driver to a V.35 DTE or DCE, use an appropriate cable that is pinned correctly (straight-through for DTE, properly crossed for DCE). Run this cable from the other device to the line driver and attach it to the line driver’s interface connector. Your line driver should now be ready for continuous operation.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 5. Operation This chapter contains a list of the controls and indicators and their functions, as well as a brief description of how to operate the unit. Installation procedures must be completed and checked before you attempt to operate the line driver. 5.1 Controls and Indicators The front panel of the standalone line driver is shown in Figure 5-1 below. The front panel of the rackmount card line driver is shown in Figure 5-2.
CHAPTER 5: Operation PWR 2 1 RTS TD 4 3 RD 5 DCD 6 TEST ERR 7 RPF E DIG A ANA B REM C PATT D Figure 5-2. The front panel of the rackmount card line driver. Table 5-1. The controls. The Item labels in this table correspond to those in Figures 5-1 and 5-2. ITEM CONTROL FUNCTION A DIG Pressing the local digital loopback button causes the local LDM-MR256 to loop received data and clock to its transmitter. Data Set Ready goes low. B ANA Pressing the local analog loopback (V.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) Table 5-2. The indicators. The item numbers in this table correspond to Figures 5-1 and 5-2. ITEM INDICATOR FUNCTION 1 PWR Green LED is on when power is on. 2 RTS Yellow LED is on when terminal activates Request to Send. 3 TD Yellow LED is on when steady SPACE is being transmitted. It flickers when data is transmitted. 4 RD Yellow LED is on when steady SPACE is being received. It flickers when data is received.
CHAPTER 6: Troubleshooting 6. Troubleshooting This chapter explains system-test and fault-isolation procedures. The line driver provides local loopback and remote digital loopback in compliance with the V.54 standard. Unless you disable them, the unit’s loopback tests can be activated manually from the unit’s front panel, and the local analog and remote digital loopbacks can be activated electronically through the DTE connection. 6.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) PATT PRESSED PATTERN GENERATOR PATTERN TESTER XMT RCV ERROR ASM-20 Figure 6-1. BERT using loops. PATT DEPRESSED DEPRESSED (DISCONNECTS EXTERNAL DTE) RCV PATTERN GENERATOR PATTERN TESTER ERROR PATTERN TESTER PATTERN GENERATOR DTE XMT ERROR Figure 6-2. Two line drivers doing end-to-end BERT.
CHAPTER 6: Troubleshooting 6.3 The Modem Self-Test To verify that the line driver itself is operating correctly, initiate the modem selftest by pressing the PATT and ANA buttons (refer to Figure 6-3 below): 1. Press ANA to start local analog loopback. Both the TEST and DCD LEDs should light. If the DCD LED doesn’t light, make sure that the RTS signal is not OFF (low) while the CARRIER jumper is OFF. 2. Press PATT to begin test-pattern transmission.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 2. Verify that the DTE is operating properly and can be used for a test. 3. Perform the test using one of these methods: • Send data from the DTE and check the echoed data stream. • Hook up an external Bit Error Rate Test (BERT) unit in place of the DTE. • Use the line driver’s internal BERT. Press the PATT button.The ERR LED should light briefly just to confirm that the LED is working, and then the test will proceed.
CHAPTER 6: Troubleshooting 6.5 Remote Digital Loopback Activate the remote digital loopback test by pressing the REM button or by raising the level of the remote loopback signal received by the line driver’s V.35 connector (Pin HH). This test involves creating an outbound loopback at the remote line driver (see Figure 6-5 on the next page). The test checks the performance of the local and remote units and the line between them: 1.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) REM DEPRESSED DATA CLK XMTR RCVR LOCAL DTE REMOTE DTE CLK DATA RCVR XMTR Figure 6-5. Remote digital loopback. 6.6 Local Digital Loopback Activate the local digital loopback test by pressing the DIG button on the line driver’s front panel. This test involves creating an outbound loopback at the local line driver (see Figure 6-6 on the next page). It works the same way as if the remote operator had initiated a remote digital loopback at the remote site.
CHAPTER 6: Troubleshooting 4. After the test is complete or the fault has been corrected, restore the DIG button to its normal position. DIG DEPRESSED XMTR RCVR DATA CLK LOCAL DTE REMOTE DTE RCVR XMTR DATA CLK Figure 6-6. Local digital loopback. 6.7 Calling Black Box If you determine that your line driver 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.
256-KBPS LINE DRIVER (V.35, RS-530, OR X.21) 6.8 Shipping and Packaging If you need to transport or ship your line driver: • Package it carefully. We recommend that you use the original container. • If you are shipping the line driver for repair, make sure you include its power cord. If you are returning the LDM-MR256, make sure you include its manual as well. Before you ship, contact Black Box to get a Return Authorization (RA) number.
APPENDIX: Maximum Distances Appendix: Maximum Distances The maximum distance that a pair of line drivers can communicate across will vary depending on the data rate and the thickness (gauge) of the wires. In multipoint applications, it will also vary depending on the number of slaves on the line. Approximate maximum distances for different combinations of these factors are listed in the tables below.
© Copyright 2004. Black Box Corporation. All rights reserved.