Black Box SHM-768K Series Manual
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Black Box SHM-768K Series Manual

Black Box SHM-768K Series Manual

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CUSTOMER
SUPPORT
INFORMATION
SHM-768K
R T S
P W R
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
D I G
E R R
T E S T
D C D
R D
T D
MARCH 1997
ME280A-35
ME280A-36
ME280A-530
ME280A-X21
ME280AE-35
ME280AE-X21
ME280C-35
ME280C-530
P A T T
R E M
A N A

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Summary of Contents for Black Box SHM-768K Series

  • Page 1 Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) SUPPORT FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 SHM-768K 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 B of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when the equipment is...
  • Page 3 SHM-768K 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 SHM-768K 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.
  • Page 5 SHM-768K TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

  • Page 6: Table Of Contents

    SHM-768K Contents Chapter Page 1. Specifications ..........7 1.1 Analog Interface .
  • Page 7 SHM-768K Contents (continued) Chapter Page 5.1 General ..........30 5.2 Loop Tests Procedure .

  • Page 8: Specifications

    SHM-768K 1. Specifications 1.1 Analog Interface Line Type—Unloaded 4W twisted pair 19 to 26 gauge Range—Refer to Table 1-1 Level—Strap-selectable to 0 dBm or -6 dBm Impedance—120 Ω Return Loss—Greater than 15 dB Carrier—Controlled by RTS or constantly ON Modulation—Conditioned diphase Eurocom Std. D1 Connector—Terminal block 1.2 Digital Interface Type—RS-530, RS-422/V.36, V.35, X.21...

  • Page 9: Timing Elements

    SHM-768K 1.4 Timing Elements Receive Clock—Derived from the receive signal Transmit Clock—Derived from 3 alternative sources: 1) Internal oscillator, 2) External from the DTE, 3) Loop clock derived from the receive signal, looped back as a transmit clock 1.5 Indicators Transmit Data—TD Receive Data—RD Request to Send—RTS...

  • Page 10: Environment

    SHM-768K 1.8 Environment Temperature—32 to 122°F (0 to 50°C) Humidity—Up to 95% noncondensing Table 1-1. Approximate Range. Baud 22 AWG 24 AWG 26 AWG Rate (0.7 mm) (0.5 mm) (0.4 mm) (Kbps) miles miles miles 5.25 4.25 1.25...

  • Page 11: Introduction

    SHM-768K 2. Introduction 2.1 General The SHM-768K operates synchronously, full duplex over 4-wire unconditioned lines. It has a range of 4.1 miles (6.5 km) and operates at 5 selectable rates up to 768 kbps. One of four interfaces are available: V.35, RS-422/V.36, X.21, and RS-530.

  • Page 12: Physical Description

    SHM-768K EXT CLK EXT CLK V.54 DLY-On V.54 DLY-On Digital Service Network SHM-768K SHM-768K ASM-45 ASM-45 ASM-45 ASM-45 SHM-768K SHM-768K RCV CLK V.54 RCV CLK V.54 RCV CLK RCV CLK DELAY OFF DELAY OFF V.54 DLY-Off V.54 DLY-Off Figure 2-2. Tail-end for DDS Service Application. The SHM-768K is coupled to the line through isolation transformers which, in conjunction with protective circuitry, protect against AC or DC overvoltages.

  • Page 13: Receiver

    SHM-768K Timing Generator This circuit supplies the transmit clock to the encoder. The setting of the XMT CLK jumper selects one of three available clock sources: • INTERNAL CLK (from the modem’s internal crystal oscillator) • EXTERNAL CLK (from DTE) •...

  • Page 14: Test Pattern Generator And Receiver

    SHM-768K 2.3.4 T ATTERN ENERATOR AND ECEIVER This feature allows for easy and quick testing of the local modem as well as the communication link. When the PATT button on the front panel is activated, the circuit sends and checks a standard 511-bit pseudo-random pattern.

  • Page 15: Installation

    SHM-768K 3. Installation 3.1 General This chapter provides instructions for mechanical and electrical installation of the SHM-768K stand-alone model. (Refer to Chapter 6 for rack installation instructions.) After completing installation, refer to Chapter 4 for operating information and system checkout to assure normal operation. 3.2 Site Preparation Install the SHM-768K within 5 feet (1.5 m) of an easily accessible grounded AC outlet.

  • Page 16: Rear Panel Connections

    SHM-768K WARNING Before connecting AC power to this unit, the protective earth terminals of this unit must be connected to the protective ground connector of the (mains) power cord. The mains plug should only be inserted in a socket outlet provided with a protective earth contact. The protective action must not be negated by use of an extension cord (power cable) without a protective conductor (grounding).
  • Page 17 SHM-768K DTE (J1) AC MAINS FUSE CABLE Figure 3-1. SHM-768K Rear Panel. NOTE For applications using an X.21 interface external clock (DTE timing source), connect the input clock to pins 7(A) and 14(B) of the 15-pin connector. We recommend that you configure one of the units as RCV clock, and the other unit as either INT or EXT clock.
  • Page 18 SHM-768K Table 3-1. Interface Signal List (Female Connectors) Pins and Standard Signal Names. V.35 EIA-530 X.21 Signal DB25 34-Pin DB25 DB25 DB15 Description Function Frame Standalone Standalone Frame Standalone Pin Circuit Pin Circuit Pin Circuit/ (Function) Protective A Frame 101 Chassis ground.
  • Page 19 SHM-768K Table 3-1. Interface Signal List (Female Connectors) Pins and Standard Signal Names (continued). V.35 EIA-530 X.21 Signal DB25 34-Pin DB25 DB25 DB15 Description Function Frame Standalone Standalone Frame Standalone Pin Circuit Pin Circuit Pin Circuit/ (Function) Clear to D CTS 106 5 CB(A) A positive level Send...
  • Page 20 SHM-768K Table 3-1. Interface Signal List (Female Connectors) Pins and Standard Signal Names (continued). V.35 EIA-530 X.21 Signal DB25 34-Pin DB25 DB25 DB15 Description Function Frame Standalone Standalone Frame Standalone Pin Circuit Pin Circuit Pin Circuit/ (Function) External U SCTE(A) 113 24 DA(A) 7 (A) A serial data Transmit...

  • Page 21: Strap Selection

    SHM-768K Table 3-1. Interface Signal List (Female Connectors) Pins and Standard Signal Names (continued). V.35 EIA-530 X.21 Signal DB25 34-Pin DB25 DB25 DB15 Description Function Frame Standalone Standalone Frame Standalone Pin Circuit Pin Circuit Pin Circuit/ (Function) Remote 21 RL A control signal Loopback input;...
  • Page 22 SHM-768K WARNING: HIGH VOLTAGE Disconnect the SHM-768K power cable before opening the top cover. Table 3-2. SHM-768K Strap Selection. Strap Identity Function Possible Factory Settings Setting No. 1 Selects the data rate. Baud Rate (kbps) No. 2 Selects the transmit timing signal XMT CLK from either: internal clock, external INT clock, or receive clock.
  • Page 23 SHM-768K Table 3-2. SHM-768K Strap Selection (continued). Strap Identity Function Possible Factory Settings Setting No. 6 Enables Remote loopback command from the DTE Command (via Pin 21) for EIA-530, or via Pin H for V.35. No. 7 When set to ON, the V.54 delay V.54 DLY is activated, preventing multiple loopback of tail-end circuits.
  • Page 24 SHM-768K BAUD RATE (KBPS) CARRIER CNTRL DTE COMMAND V.54 XMT CLK EX INT X.21 EX CK XMT LEVEL DISCONN CONNECT CHAS GND Figure 3-2. Printed Circuit Board Layout.

  • Page 25: Operation

    SHM-768K 4. Operation 4.1 General This chapter describes and explains the SHM-768K controls and indicators, provides operating procedures, and supplies instructions for field strapping changes. Installation procedures given in Chapter 3 must be completed and checked before attempting to operate the SHM-768K. 4.2 Controls and Indicators All controls (push-button switches) and LED indicators are located on the SHM-768K front panel.
  • Page 26 SHM-768K Table 4-1. Control Functions. (The item labels in this table correspond to Figure 4-1.) Item Control Function The Digital loopback switch causes the local SHM-768K to loop received data and clock to its transmitter. Data Set Ready goes low (Figure 5-5).
  • Page 27 SHM-768K Table 4-2. Indicators. (The item labels in this table correspond to Figure 4-1.) Item Indicator Function Green LED is ON when power is on. Yellow LED is ON when terminal activates Request to Send. Yellow LED is ON when steady SPACE is being transmitted.
  • Page 28 SHM-768K R A D TEST PATT ASM-45 Figure 4-2. SHM-768K, Card Version: Front Panel.

  • Page 29: Operating Procedure

    SHM-768K 4.3 Operating Procedure The SHM-768K operates unattended once installed (refer to Chapter 3). Intervention is only required when: • The SHM-768K is set up for the first time. • The SHM-768K must be adapted to new operational requirements. • Diagnostic loops are required. 4.3.1 P OWER ROCEDURE...

  • Page 30: Operational Field Strapping Changes

    SHM-768K 4.4 Operational Field Strapping Changes If it becomes necessary to reconfigure the SHM-768K for a different type of operation, field straps must be changed to correspond to the new operating mode. For guidance in repositioning the straps and switches, refer to Section 3.4.4 and to Table 3-2.

  • Page 31: Tests And Diagnostics

    SHM-768K 5. Tests and Diagnostics 5.1 General This chapter contains information on system test and fault isolation procedures. 5.2 Loop Tests Procedure The test switches and LED indicators built into the SHM-768K allow rapid checking of the data terminals, SHM-768K and lines. Use the test procedures provided in this chapter to verify normal system operation and to isolate faulty equipment in the event of failure.
  • Page 32 SHM-768K PATT DEPRESSED PATTERN GENERATOR PATTERN TESTER ERROR ASM-45 Figure 5-1. BERT Using Loops. Alternatively, the complete link can be tested when used opposite an SHM-768K either with the PATT button pressed or with an external BERT transmitting the same 511-bit pattern (according to V.52), as in Figure 5-2. To activate the BERT, press the PATT button.

  • Page 33: Modem Self Test

    SHM-768K PATT PATT DEPRESSED DEPRESSED PATTERN PATTERN PATTERN TESTER TESTER GENERATOR ERROR EXTERNAL PATTERN PATTERN BERT TESTER GENERATOR ERROR ASM-45 ASM-45 Figure 5-2. Two BERTs Operating End-to-End. 5.4 Modem Self-Test To verify that the SHM-768K is operating correctly, follow the instructions below: Step A Press the ANA (Analog Loopback) button on the front panel.

  • Page 34: Local Test-Analog Loopback

    SHM-768K 5.5 Local Test—Analog Loopback This test checks the performance of the local modem, the local data terminal and the cables between them. It is performed separately at the local and the remote sites. DEPRESSED DATA XMTR DATA TERMINAL LINE DATA RCVR ASM-45...

  • Page 35: Communication Link Tests

    SHM-768K • Use the internal Bit Error Rate Tester (BERT). Press the PATT button. The ERR LED lights briefly to indicate that the LED is functioning. If any bit error is encountered the LED blinks or remains ON. • Step D: Perform Step C at both ends. If BERT test equipment indicates no fault, but the data terminal indicates a fault, follow the manufacturer’s test procedures for the data terminal and verify the cable connecting the terminal and the SHM-768K.

  • Page 36: Local Digital Loopback

    SHM-768K DEPRESSED DATA XMTR RCVR LOCAL REMOTE DATA DATA TERMINAL TERMINAL XMTR RCVR DATA LOCAL ASM-45 REMOTE ASM-45 Figure 5-4. Remote SHM-768K in Digital Loopback. 5.6.2 L OCAL IGITAL OOPBACK This test is activated by depressing the DIG pushbutton. It loops the received data back to the remote SHM-768K.

  • Page 37: Rack Version

    SHM-768K 6. SHM-768K 19" Rack Version 6.1 Description The Rack (part number RM110A) shown in Figures 6-1 and 6-2 consists of a power supply and up to 14 plug-in card modems. The rear panel consists of fourteen five-screw terminal blocks (TB1) and fourteen connectors (J1). The terminal block (TB1) provides five screws for connecting the transmit and receive lines.

  • Page 38: Installation

    SHM-768K WARNING Before connecting AC power to this unit, the protective earth terminals of this unit must be connected to the protective ground connector of the (mains) power cord. The mains plug should only be inserted in a socket outlet provided with a protective earth contact. The protective action must not be negated by use of an extension cord (power cable) without a protective conductor (grounding).

  • Page 39: Power Supply Options

    SHM-768K When the unit is ON, personnel are not exposed to any voltage over 30V on any card or accessible area of the rack. CARD LOCKING SCREW SLOT 1 SLOT 14 POWER SUPPLY CONTROL PANEL Figure 6-1. Rack Installation. 6.6 Power Supply Options 6.6.1 C HOOSING A OWER...

  • Page 40: Two-Transformer Option

    SHM-768K The RM110A rack serves a number of different modems. To choose the appropriate power supply option, a summation of all the card power consumptions must be made (Table 6-1). Table 6-1. Power Consumption per Card. Card Name Power Required Consumption P.S.
  • Page 41 SHM-768K PS-1 PS-2 Power XMIT Figure 6-2. Rack Enclosure with Dual Power Supply. The item numbers in Table 6-2 correspond to the reference numbers in Figure 6-2.
  • Page 42 SHM-768K Table 6-2. Controls, Indicators, and Connectors. Item Control, Indicator or Connector Function Card Slots Slots for installation of SHM-768K 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 43: Appendix A: Connecting To Rs-422

    SHM-768K Appendix A: Connecting to RS-422 Table A-1. Interface List for Connecting SHM-768K to RS-422 (V.36) DTE. Signal Function RS-449 (RS-422/423) EIA 530 37 pins DB25 Female Standalone and Frame Circuit Circuit Protective Ground Shield Signal Ground 19, 37, 20 Transmitted Data SD(B) BA(A)
  • Page 44 SHM-768K Table A-1. Interface List for Connecting SHM-768K to RS-422 (V.36) DTE (continued). Signal Function RS-449 (RS-422/423) EIA 530 37 pins DB25 Female Standalone and Frame Circuit Circuit Local Analog Loopback Remote Loopback Test Indicator...

  • Page 45: Appendix B: Installing The Standalone Unit In A Rack

    SHM-768K Appendix B: Unit Case Assembly B.1 Installing the Standalone Unit in a Rack The height of the unit is 1U (1.75"); the width of the unit is slightly more than half the available mounting width. A rack adapter kit is available for installing either a single unit or two units side by side in the 19"...

  • Page 46: Installation Of Two Units

    SHM-768K Once the brackets are fastened to the side walls, the unit is ready for installation in the 19" rack. Place the unit in the rack and fasten the brackets to the side rails of the rack by means of the two screws situated on each side (not included in the kit).
  • Page 47 SHM-768K To install two units follow these instructions: 1. Fasten one long side rail to each unit (one on the right side of one unit, the other on the left side of the other unit) using the 4 screws and flatwashers supplied.
  • Page 48 © Copyright 1997. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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