Black Box High Speed SHM-B Async Manual
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Black Box High Speed SHM-B Async Manual

Black Box High Speed SHM-B Async Manual

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High Speed SHM-B Async
High Speed SHM-B Async Card
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.com
T D
B A S
H M -
E D S
S P E
H I G H
JANUARY 1995
M A L
N O R
D L B
R D
Y N C
ME802A
ME802AE
ME802C

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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 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.com...
  • Page 2 HIGH SPEED SHM-B ASYNC AND CARD 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.
  • Page 3 HIGH SPEED SHM-B ASYNC AND CARD This digital apparatus does not exceed the Class A limits for radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada. Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux...

  • Page 4: Table Of Contents

    HIGH SPEED SHM-B ASYNC AND CARD Contents Chapter Page 1. Specifications ............1 2. Introduction............4 3. Installation .............5 3.1 Four-Wire Connections .......5 3.2 EIA-232 Connection ........7 3.3 Jumper Settings ...........9 3.4 Flow Control ..........9 3.5 ME800 Compatibility.........11 4. Operation.............12 5. Rackmount Installation ........15...

  • Page 5: Specifications

    CHAPTER 1: Specifications 1. Specifications Transmission — Data Rate (bps) Max. Distance (miles) 115,200 56,000 19,200 2,400 NOTE: The transmission specifications are for 24-AWG unshielded twisted-pair cable with a mutual capacitance of no more than 15 pF/ft. Shielded twisted-pair cable will reduce the distance to one-third of the table value, because of the additional capacitance contributed by the cable’s shielding.
  • Page 6 HIGH SPEED SHM-B ASYNC AND CARD Equipment Interface — EIA-232/CCITT V.24 interface with hardware-handshake support. Carrier Detect (CD) true (high) indicates that the short-haul modem at the remote end of the loop is on and active. Interface is jumper selectable for DTE/DCE configuration.
  • Page 7 CHAPTER 1: Specifications Temperature Operating — 32 to 140°F (0 to 60°C) Storage — -4 to 158°F (-20 to 70°C) Humidity — 0 to 95% max., noncondensing Power — ME802A, primary: 115 VAC ±10%, 60 Hz; ME802AE, primary: 230 VAC ±10%, 50/60 Hz;...

  • Page 8: Introduction

    High Speed SHM-B Async includes EIA-232 control-line interfaces, status monitor LEDs, and a loopback switch. The High Speed SHM-B Async is available in both a standalone version (ME802A or ME802AE) and a rackmount card version (ME802C).

  • Page 9: Installation

    CHAPTER 3: Installation 3. Installation Installation involves three steps: four-wire connections, EIA-232 connection, and jumper settings. 3.1 Four-Wire Connections Figure 1 shows the location of the terminal block on the circuit board. Refer to Figure 2 to make the proper connections between two High Speed SHM-B Async units.
  • Page 10 HIGH SPEED SHM-B ASYNC AND CARD J1 RS-232 CONNECTOR XW1A XW1B LOOPBACK SWITCH Figure 1. High Speed SHM-B Async board: locations of jumpers and 4-screw terminal block.

  • Page 11: Eia-232 Connection

    Figure 2. Wiring diagram for two High Speed SHM-B Async units. 3.2 EIA-232 Connection Connect the High Speed SHM-B Async to your computer or terminal with a standard EIA-232 cable and DB25 connectors. Refer to your equipment’s installation manual if you need information on the exact EIA-232 signals required for your equipment.
  • Page 12 Data Set Ready (DSR), etc. The High Speed SHM-B Async generates levels for the control signals if you need to use them. The table below shows the pin connections on the High Speed SHM-B Async. Table 1. EIA-232 Pin Connections ME802...

  • Page 13: Jumper Settings

    DTE/DCE operation. This eliminates the need to use a crossover cable when connecting to your data-communications equipment. If you connect the High Speed SHM-B Async to your equipment using a straight-through cable, then W1 must be set to the opposite of your device’s configuration.
  • Page 14 If the remote High Speed SHM-B Async is configured as a DTE device, it raises its DTR lead (pin 20) when it senses an active driver circuit on the High Speed SHM-B Async at the other end of the line. X-ON/X-OFF M...

  • Page 15: Me800 Compatibility

    When jumpers W3 and W4 are set in the B-C positions, the output signal of the High Speed SHM-B Async is reduced to be compatible with the ME800 SHM-B Async. If the Jumpers W3 and W4 are not placed in the B-C posi- tion and an ME800 unit is attached, the receive circuitry on the ME800 may be damaged.

  • Page 16: Operation

    Once you have checked the connection to the attached RS-232 device, release the LOOPBACK switch on the “local” High Speed SHM-B Async and press the LOOPBACK switch on the “remote” High Speed SHM-B Async. If a CRT terminal is connected to the “local”...
  • Page 17 High Speed SHM-B Async units to normal mode. Data transmission between the two modems should now be possible. If you have problems communicating between the two High Speed SHM-B Async units, refer to Chapter 6 to help diagnose the problem. (RS-232) (RS-232) (RS-232) SHM #1 in NORMAL mode.
  • Page 18 HIGH SPEED SHM-B ASYNC AND CARD The TD and RD LEDs on the front panel of your High Speed SHM-B Async indicate the status of the High Speed SHM-B Async transmitter and receiver, respectively. The TD LED will light when data is transmitted out of the RS-232 port on the High Speed SHM-B Asyn;...

  • Page 19: Rackmount Installation

    CHAPTER 5: Rackmount Installation 5. Rackmount Installation The High Speed SHM-B Async Card (ME802C) is a rackmount unit that installs in a standard 19-inch (48.3-cm) panel rack. (You can use the SHM-B Rack [ME810], which can hold up to 16 cards.) The SHM- B Async rack will occupy 5.25 inches (13.3 cm) of...
  • Page 20 After a High Speed SHM-B Async Card is wired, it can then be inserted into an open slot in the SHM-B rack. Be certain that the circuit board has mated with the power pins on the SHM-B rack before applying force to fully seat the board;...

  • Page 21: Troubleshooting

    (if anything) you have already done to correct the situation. SYMPTOM: No data transfer in one or both directions (to, from, or to and from the High Speed SHM-B Async). 1. Monitor the TD LED on the sending-end modem while you send some data. The light should flash with data.
  • Page 22 High Speed SHM-B Async unit. If data transfer now occurs, either an EIA-232 control signal supplied to the High Speed SHM-B Async by the attached RS-232 device was not at the correct level, or jumper W2 was improperly set for your application.
  • Page 23 Refer to Section 3.1 and Figure 2. 2. Check word structure and speed settings on your computing equipment for consistency. 3. Wire the High Speed SHM-B Async units back- to-back, eliminating the twisted pair; see if you still have errors.
  • Page 24 HIGH SPEED SHM-B ASYNC AND CARD • If you don’t have errors, you should suspect a problem with the twisted-pair cable. SYMPTOM: Occasional data errors. 1. The transmission distance/data rate capability may have been exceeded. Refer to Chapter 1 for information about valid data transmission distances and data rates.
  • Page 25 CHAPTER 6: Troubleshooting 4. While you are checking your cable for sources of noise and crosstalk, check the cable for irregularities in the shield. Also, reconsider the cable’s ratings for attenuation, capacitance, and impedance. You may need to install a higher-quality cable for your particular installation.
  • Page 26 © Copyright 1995. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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