Black Box SHM-B Sync Manual
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Black Box SHM-B Sync Manual

Black Box SHM-B Sync Manual

Short-haul modem-b sync
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Short-Haul Modem-B Sync
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.com
(SHM-B Sync)
S Y N C
DECEMBER 1999
R D
O D E M
T D
U L M
T H A
S H O R
ME801A
ME801A-E
ME801-C
M A L
N O R
B A C K
L O O P

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Summary of Contents for Black Box SHM-B Sync

  • Page 1 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.com...
  • Page 2 FCC/IC RFI 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...
  • Page 3 SHORT-HAUL MODEM-B SYNC (SHM-B SYNC) 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: Table Of Contents

    SHORT-HAUL MODEM-B SYNC (SHM-B SYNC) Contents Chapter Page Specifications ................. 5 Introduction ................8 Configuration ................ 9 Installation ................12 4.1 Installing Standalone Units ........12 4.2 Installing Card Units ..........15 4.3 Initial Testing .............. 18 Operation ................19 5.1 Normal Operation and LED Functions ....

  • Page 6: Specifications

    RS-232-C (DCE) to attached local device; Interfaces — Proprietary balanced 4-wire to line Protocol — Synchronous Clock Source — Local internal (each SHM-B Sync unit independently generates its own clock) Operation — 4-wire full-duplex Flow Control — Hardware (RTS and/or DTR), local only (control signals are not passed across the 4-wire line—see Section 5.2);...
  • Page 7 SHORT-HAUL MODEM-B SYNC (SHM-B SYNC) (1) Front-mounted pushbutton to turn User Controls — loopback ON and OFF; (6) Internal pairs of jumper posts for setting the data rate; (3) Internal pairs of jumper posts for setting CTS delay Indicators —...
  • Page 8 CHAPTER 1: Specifications ME801A: From utility-power (mains) outlet Power — through wallmount transformer: Input: 108 to 132 VAC, 60 Hz, at ~160 mA (20 watts); Output: 17 VAC CT at 700 mA; ME801A-E: From utility-power (mains) outlet through desktop transformer: Input: 198 to 242 VAC, 50 or 60 Hz, at ~90 mA (20 watts);...

  • Page 9: Introduction

    5 miles (8 km), at data rates up to 19,200 bps. In addition to its transmitter and receiver circuits, the SHM-B Sync also features status LEDs, a loopback switch, and support for RS-232 clock and control signals.

  • Page 10: Configuration

    There are two sets of jumper posts mounted on the SHM-B Sync’s circuit board: • Six pairs of posts are used to set the SHM-B Sync’s data rate. They’re at the front of the left-hand side of the board (the ones labeled “DATA-RATE SELECTION”...
  • Page 11 (the ones labeled “CTS- DELAY SELECTION” in Figure 3-1). The CTS delay is the amount of time that the SHM-B Sync waits after detecting that the attached device has raised RTS before it responds by raising CTS. The possible settings are LONG (53 ms), SHORT (7 ms), or NONE.
  • Page 12 LINE CONNECTION • • • • 1200 DATA-RATE • • 2400 • • 4800 SELECTION • • 9600 • • 19200 LOOPBACK SWITCH INDICATORS Figure 3-1. The SHM-B Sync’s circuit board. (Standalone board shown; card version will not have power-line connection.)

  • Page 13: Installation

    Take these steps to install a pair of standalone SHM-B Sync units (ME801A or ME801A-E): 1. Open the case of one of the SHM-B Sync units. Refer to Chapter 3 for how to do this (and for precautions you should take when you do).
  • Page 14 Figure 3-1 on page 11 for the location of these terminals. Bear in mind as you do this that the wires must run from TX+ in one SHM-B Sync to RX+ in the other, and from TX– to RX–, RX+ to TX+, and RX–...
  • Page 15 9. Repeat steps 1 through 8 with the remote site’s SHM-B Sync unit. 10. Plug in both SHM-B Sync units and power up the attached RS-232 devices. Your SHM-B Sync system should begin operating right away. If the LEDs on the units’...

  • Page 16: Installing Card Units

    CHAPTER 4: Installation 4.2 Installing Card Units Take these steps to install a set of SHM-B Sync cards (ME801-C): 1. Remove the front panel of the powered-down ME810 or RM007 card chassis in which you’ll be installing a SHM-B Sync card. If you’re unsure how to do this, refer to the chassis’...
  • Page 17 SHORT-HAUL MODEM-B SYNC (SHM-B SYNC) wires must run from TX+ in one SHM-B Sync to RX+ in the other, and from TX– to RX–, RX+ to TX+, and RX– to TX–, as shown in Figure 4-1 on page 14. 5. Wrap the nylon cable tie provided with the SHM-B...
  • Page 18 9. Repeat steps 1 through 8 with the remote site’s SHM-B Sync card. 10. Plug in both chassis and power up the RS-232 devices attached to each card. Your SHM-B Sync system should begin operating right away. If the LEDs on the cards’ front panels light up, do the tests described in Section 4.3.

  • Page 19: Initial Testing

    4.3 Initial Testing When you have installed and powered up a pair of SHM-B Sync units and the attached RS-232 devices, test your system by sending data from one RS-232 device to the other (and vice versa if the link is meant to be bidirectional).

  • Page 20: Operation

    Refer to the next section for a description of how the RS-232 interface operates, and to Appendix B for a block diagram of how the SHM-B Sync works at a circuit level. If you ever have difficulty, you can do loopback testing as described in the next section and/or refer to the problem descriptions in Section 6.1.

  • Page 21: Synchronous Timing

    The SHM-B Sync should be connected to your RS-232 device with a standard RS-232 cable. The cable must have a DB25 male connector at the SHM-B Sync’s end. The type of connector at the other end will depend on what type of RS-232 device you’re attaching, and the...
  • Page 22 Table 5-1 below shows the RS-232 pins and signals that the SHM-B Sync supports. Table 5-1. Supported RS-232 Leads/Signals DB25 Pin...
  • Page 23 The control signals will stay in this state unless: • One of the SHM-B Sync units is powered down (all signal transmission at its end will cease and the other SHM-B Sync will lower CD);...
  • Page 24 Transmit Clock (TC) and Receive Clock (RC) leads while the system is operating. The SHM-B Sync cannot accept clock from the attached device; it also cannot buffer signals, so it’s very important that the two SHM-B Sync units are set to the same data rate.

  • Page 25: Troubleshooting

    SHM-B Sync unit will be echoed back to it across the 4-wire link rather than forwarded on to the attached device.
  • Page 26 SHM-B Sync, the characters pass through the 4-wire cable as well. (Do not turn loopback mode on at both SHM-B Sync units at the same time.) If some component of the data loop is broken, improperly installed, etc., characters will come...

  • Page 27: Common Problems

    SHM-B Sync and a few suggestions for possible causes and things to do about them. The LEDs don’t light when the SHM-B Sync is plugged in. 1. Loose power connection or non-working outlet? If your SHM-B Sync is a standalone model, try moving or wiggling the wallmount transformer.
  • Page 28 1. Check the pinning of your RS-232 cable and of your device’s RS-232 port. 2. Check the data-rate settings of both SHM-B Sync units; they must be set to the same data rate. And both of the attached devices must be set to receive clock from the SHM-B Sync.
  • Page 29 4-wire cable is probably broken or defective. 6. Test each SHM-B Sync’s RS-232 interface with a breakout box. Pins 4, 5, 6, 8, and 20 all have to be “high” (above +3V) in order to enable data communication.
  • Page 30 2. Is the 4-wire cable wired properly? Make sure the four wires are connected to the proper terminals on your SHM-B Sync units; refer to Figure 4-1 on page 14 for end-to-end pinning. (If your SHM-B Sync units are standalone models, these inspections will require that you carefully open their cases—see Chapter 3.)
  • Page 31 4. Is the 4-wire cable high quality? If not, try swapping in a better one. 5. You might be having AC-power trouble. Try plugging the SHM-B Sync standalone unit or the card’s chassis into a different outlet or a different power circuit entirely. If that doesn’t work, try installing a surge protector or uninterruptible power supply.

  • Page 32: Calling Black Box

    CHAPTER 6: Troubleshooting 6.3 Calling Black Box If you determine that your SHM-B Sync system is malfunctioning, do not attempt to alter or repair the units. They contain 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.

  • Page 33: Shipping And Packaging

    SHORT-HAUL MODEM-B SYNC (SHM-B SYNC) 6.4 Shipping and Packaging If you need to transport or ship a SHM-B Sync: • Package it carefully. We recommend that you use the original container. • Before you ship the unit back to Black Box for repair or return, contact us to get a Return Authorization (RA) number.

  • Page 34: Appendix A: Distances, Data Rates, And Cable Specifications

    SHM-B Sync. The table below shows the distances and data rates attainable with this type of cable. CAUTION! Most types of UTP cable can be used with the SHM-B Sync without having much adverse effect on its performance. But, because it has much higher capacitance, shielded...

  • Page 35: Appendix B: Block Diagram

    SHORT-HAUL MODEM-B SYNC (SHM-B SYNC) Appendix B: Block Diagram...
  • Page 36 NOTES...
  • Page 37 © Copyright 1999. 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:

Me801aMe801a-eMe801-c

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