Black Box MicroNTU G.703 Series Manual
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Black Box MicroNTU G.703 Series Manual

Black Box MicroNTU G.703 Series Manual

Card 120 ohm / 75 ohm
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MicroNTU G.703 Card (120 ohm)
MicroNTU G.703 Card (75 ohm)
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 U
M i c r o N
G . 7 0 3
P o w e r
k
N e t w o r
M a s t e r
C l o c k
c k
L o o p b a
N o r m a l
JUNE 1999
MT245A
MT246A

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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 SUPPORT Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 MICRONTU G.703 CARD (120 OR 75 OHM) 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 MICRONTU G.703 CARD (120 OR 75 OHM) 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 MICRONTU G.703 CARD (120 OR 75 OHM) 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

    MICRONTU G.703 CARD (120 OR 75 OHM) Contents 1. Specifications.....................5 2. Introduction ......................6 3. Configuration ....................7 3.1 Front-Card Configuration................7 3.2 Rear-Card Configuration ................9 3.2.1 Configuring the 120-Ohm Rear Card ..........9 3.2.2 Configuring the 75-Ohm Rear Card ..........12 4. Installation.......................14 4.1 The MicroRack and Power Supplies ............14 4.2 Installing the MicroNTU G.703 Card in the MicroRack Chassis ..16 4.3 Connection to the G.703 Network ............17 4.3.1 Twisted-Pair (120-Ohm) Connection (MT245A)......18...

  • Page 6: Specifications

    CHAPTER 1: Specifications 1. Specifications Network Interface G.703 2.048 Mbps Network Rate Network Connectors MT245A: One modular RJ-45 connector (120-ohm); MT246A: Two BNC (75-ohm) Terminal Interface MT245A: EIA-530 (RS-422) on DB25 female; MT246A: CCITT X.21 on DB15 female Internal Interface Connection to MicroRack 2, 4, 8, or 16 (RM202, RM204, RM208, or RM216) midplane architecture chassis via (2) 50-pin male card...

  • Page 7: Introduction

    MT245A), or 75-ohm dual coax to the network and X.21 to the terminal (MT246A). The EIA-530 terminal interface can also be adapted to X.21 using an EIA RS-530 to CCITT X.21 adapter cable (call Black Box). The MicroNTU G.703 Card is designed to mount in the MicroRack 2, 4, 8, or 16 (RM202, RM204, RM208, RM216).

  • Page 8: Configuration

    CHAPTER 3: Configuration 3. Configuration The MicroNTU G.703 Card (MT245A) uses seven jumpers (or four for MT246A), which allow the unit to be configured for a wide range of applications. Designed around a mid-plane architecture, the MicroNTU G.703 Card incorporates both front and rear cards. Configuration of both may be necessary.
  • Page 9 MICRONTU G.703 CARD (120 OR 75 OHM) LK6: Tx Clock Source Jumper LK6 is a three-post jumper. Figure 3-2 shows the three possible orientations of this jumper. Front of Card Figure 3-2. Possible strap positions for jumper LK6. The setting for jumper LK6 determines whether the MicroNTU G.703 Card will provide an internal clock, or will be receiving a clock from an external device.

  • Page 10: Rear-Card Configuration

    CHAPTER 3: Configuration LK7: Data Inversion The setting for jumper LK7 determines whether data will be inverted or not inverted. Setting Strap Installed Data Inverted Strap Omitted Data Not Inverted (Default) 3.2 Rear-Card Configuration The MicroNTU G.703 Card has two rear interface card options: for the MT245A, 120-ohm (modular) network and EIA-530 (DB25) terminal, or, for the MT246A, 75-ohm (dual BNC) network and X.21 (DB15) terminal.
  • Page 11 MICRONTU G.703 CARD (120 OR 75 OHM) Table 3-1 shows the factory-default jumper settings for the 120-ohm rear card. Following Table 3-1 is a description of each jumper’s function and possible settings. When configuring the jumpers, take care not to lose the individual straps.
  • Page 12 CHAPTER 3: Configuration LK3: (Receive Pair) Pin 2-to-Ground Connection This setting determines whether or not pin 2 of the receive pair is sent to earth ground. This connection should not be made in most cases. Setting Strap On Pin 2-to-GND Connection Made Strap Off Pin 2-to-GND Connection Broken LK4: Clock Synchronization (EIA-530 versus X.21)

  • Page 13: Configuring The 75-Ohm Rear Card

    MICRONTU G.703 CARD (120 OR 75 OHM) 3.2.2 C 75-O ONFIGURING THE The 75-ohm rear card has two configuration jumpers (LK1 and LK2). Figure 3-4 shows the locations of the jumpers on the 75-ohm rear card. Figure 3-4. 75-ohm rear card jumper locations.
  • Page 14 CHAPTER 3: Configuration Table 3-2 shows the factory-default jumper settings for the 75-ohm rear card. Following the table is a description of each jumper’s function and possible settings. When configuring the jumpers, take care not to lose the individual straps. Table 3-2.

  • Page 15: Installation

    MICRONTU G.703 CARD (120 OR 75 OHM) 4. Installation This chapter describes the functions of the MicroRack 2, 4, 8, and 16 chassis, tells how to install front and rear MicroNTU G.703 Cards in the chassis, and provides diagrams for wiring the interface connections correctly. 4.1 The MicroRack and Power Supplies The MicroRack comes with two, four, eight, or sixteen card slots.
  • Page 16 CHAPTER 4: Installation The power supply (PS460A or PS461A) used in the MicroRack uses the same mid-plane architecture as the modem cards. The front card of the power supply slides in from the front, and the rear card slides in from the rear. They plug into one another in the middle of the rack.

  • Page 17: Installing The Microntu G.703 Card In The Microrack Chassis

    MICRONTU G.703 CARD (120 OR 75 OHM) Switching the Power Supply Between 120 and 240 Volts Although the MicroRack is shipped from the factory with a customer-specified power-supply configuration, you may change the configuration yourself. Here are the steps to switch the configuration of the power supply between 120 and 240 VAC: 1) Remove the front power-supply card and locate the two-position switch near the back of the card.

  • Page 18: Connection To The G.703 Network

    CHAPTER 4: Installation 4.3 Connection to the G.703 Network The MicroNTU G.703 Card supports 2.048-Mbps communication over an unstructured G.703 network. Both 120- and 75-ohm interface cards are available (see Figure 4-2). MT245A MT246A RJ-45 (120-Ohm) Dual BNC (75-Ohm) DB25F DB15F Figure 4-2.

  • Page 19: Twisted-Pair (120-Ohm) Connection (Mt245A)

    MICRONTU G.703 CARD (120 OR 75 OHM) 4.3.1 T (120-O (MT245A) WISTED ONNECTION The 120-ohm version of the MicroNTU G.703 Card is equipped with a single RJ-45 jack for connection to a 120-ohm twisted-pair G.703 network interface. The pinout of this jack is as follows: RJ-45 Pins Signal 1 and 2...

  • Page 20: Terminal Connection (Mt246A)

    CHAPTER 4: Installation 4.4.2 X.21 T (MT246A) ERMINAL ONNECTION The 75-ohm rear card for the MicroNTU G.703 Card is equipped with a female DB15 connector, wired according to the CCITT X.21 standard (see the Appendix). To connect to an X.21 terminal (DTE), use a standard DB15 cable.

  • Page 21: Operation

    MICRONTU G.703 CARD (120 OR 75 OHM) 5. Operation Once you have configured each MicroNTU G.703 Card and connected the cables, you are ready to operate the units. 5.1 Power-Up There is no power switch on the MicroNTU G.703 Card: Power is automatically applied to the Card when its card-edge connector makes contact with the chassis’s mid-plane socket, or when the chassis’s power supply is turned on.
  • Page 22 CHAPTER 5: Operation MicroNTU G.703 Power Network Master Clock Loopback Normal Figure 5-1. The front panel.

  • Page 23: Loopback Test (Lal)

    Verify that the data-terminal equipment is operating properly and can be used for a test. If a fault is indicated, call Black Box for technical support or replace the unit. c.) Perform a BER (bit error rate) test on each unit. If the BER test equipment indicates no faults, but the data terminal indicates a fault, follow the manufacturer’s checkout procedures for the data terminal.

  • Page 24: Appendix. Interface Standards

    APPENDIX: Interface Standards Appendix. Interface Standards MT246A CCITT X.21 INTERFACE (DB15) 1 - Frame Ground Transmit - B - 9 2 - Transmit - A Control - B - 10 3 - Control - A Receive - B - 11 4 - Receive - A Indication - B - 12 5 - Indication - A...
  • Page 25 © Copyright 1999. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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