Black Box LT2060A Manual
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Black Box LT2060A Manual

Black Box LT2060A Manual

16-port type 3 mau
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APRIL 1997
LT2060A
16-Port Type 3 MAU
3 M A U
t T y p e
1 6 - P o r
1 6
1 5
1 4
1 3
1 2
1 1
1 0
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1
R O
R I
R E S E T
CUSTOMER
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
SUPPORT
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
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com

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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 SUPPORT 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 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 FCC STATEMENT 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...
  • Page 3 INSTRUCCIONES DE SEGURIDAD 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 INSTRUCCIONES DE SEGURIDAD 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. 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada.
  • Page 5 16-PORT TYPE 3 MAU TRADEMARKS ® and AS/400 ® are registered trademarks of IBM Corporation. All applied-for and registered trademarks are the property of their respective owners.

  • Page 6: Table Of Contents

    16-PORT TYPE 3 MAU CONTENTS 1. Specifications .........8 1.1 Lobe Port Initialization .

  • Page 7: Specifications

    16-PORT TYPE 3 MAU 1. Specifications Power — No external power source is required. Data Rate — 4 and 16 Mbps. Type 3 cable may be used at 16 Mbps when media filters are used at the workstation or other attaching device. Cable —...

  • Page 8: Connectors

    16-PORT TYPE 3 MAU 1.1 Lobe-Port Initialization The station ports can be in an incorrect state for station attachment, and if they are, the MAU will be inoperable until the ports are reset. Use the Reset button to reset them. The Reset button on the front panel is used to align the relays in the station ports so they are ready for operation.
  • Page 9 16-PORT TYPE 3 MAU RJ-11 male connectors may be used instead of RJ-45 male connectors on the twisted-pair cables used in the network. Both types will work in the female connectors on the MAUs. Whether RJ-45 or RJ-11 male connectors are used, the transmit and receive pins are always the four center pins in the connector, as shown in Figure 1-1.

  • Page 10: Automatic Wrap Of Ring In And Ring Out

    16-PORT TYPE 3 MAU 1.2.1 A UTOMATIC RAP OF N AND When no connector is inserted into Ring In or Ring Out ports, the port will automatically wrap, or loop back, to utilize the backup path. The backup path is described in Section 4.1, Installation Background. 1.2.2 L NITIALIZATION The station ports can be in an incorrect state for station attachment, and if...

  • Page 11: Type 3 Cable

    16-PORT TYPE 3 MAU 1.3.2 T ABLE The Type 3 cable used with the MAU should be standard twisted-pair telephone building wire. Recommended wire gauge is 24 or 22 AWG, Belden 9562 or equivalent. The following requirements should be met: •...
  • Page 12 16-PORT TYPE 3 MAU Electrical Interference Because Type 3 cable is unshielded, care must be taken to avoid areas of electrical disturbance. Some examples of sources of electrical disturbance are: • Fluorescent lights • Power cables • Electric motors • Radio transmitters...

  • Page 13: Introduction

    16-PORT TYPE 3 MAU 2. Introduction This user’s guide covers the 16-Port Type 3 MAU, which has 16 RJ-45 connectors. 2.1 Token Ring Background Computer users have become less and less dependent on large centralized computing systems because of continuing increases in the processing power of microcomputers and minicomputers.
  • Page 14 16-PORT TYPE 3 MAU Attaching Device Attaching Attaching Device Device Attaching Device Figure 2-1. Star-wired topology Each device on the ring is known as an attaching device. Each attaching device is connected to a wiring concentrator, or multistation access unit (MAU).
  • Page 15 16-PORT TYPE 3 MAU The term “token” comes from the access scheme of the network. A unique bit sequence, or token, is continuously passed from device to device in sequence. Only one token is on a ring at one time. When a device needs access to the network, it must wait until it receives the token.

  • Page 16: Maus

    16-PORT TYPE 3 MAU 2.2 MAUs Features • Full compatibility with the IBM Token-Ring Network. • Inexpensive Type 3 cable may be used in addition to Types 1 and 2 cable. You may also use UTP or STP 100-ohm Category 5 cable. •...

  • Page 17: Installation

    NOTE ® When using Type 3 cable with 4-Mbps token rings, Black Box Media Filters (part number LT057) must be used to take full advantage of the lobe lengths stated in this chapter. When using Type 3 cable at 16Mb, Media Filters must be used.
  • Page 18 16-PORT TYPE 3 MAU 3.1.1 M When multiple MAUs are used in a token-ring network, the main ring consists of the cable between the MAUs. The length of the main ring is critical to proper network operation. The main ring does not include the cable from MAUs to their attaching devices (these cables are called lobes).

  • Page 19: Backup Path

    16-PORT TYPE 3 MAU 3.1.2 B ACKUP In a normal configuration, there is an unused pair of wires in the twisted-pair cable used in the network. This extra pair of wires, used with a backup circuit inside the MAUs, is called the backup path. MAU 3 MAU 1 MAU 2...
  • Page 20 16-PORT TYPE 3 MAU The length of the main ring is critical to the proper operation of the token- ring network. If the network is designed without taking the length of the backup path into consideration, the backup path may not be usable if it is needed.
  • Page 21 16-PORT TYPE 3 MAU The signal generated by the attaching device must travel up its lobe to the main ring, around the entire main ring, and back down the lobe to the device without being regenerated. If the backup path were being used with the shortest section of cable removed, the path would be much longer.

  • Page 22: Adjusted Ring Length

    16-PORT TYPE 3 MAU 3.1.3 A DJUSTED ENGTH In networks that use more than one MAU, adjusted ring length (ARL) is the total length of the cable connecting MAUs (the main ring) minus the shortest inter-MAU cable. Patch cables less than three feet in length are not included in this calculation.

  • Page 23: Cable Type

    16-PORT TYPE 3 MAU 3.1.5 C ABLE Type 1, Type 2, Type 3, or Category 5 cabling may be used with the MAU. Usually, Type 3 or Category 5 100-ohm cable is used with RJ-45-equipped MAUs, and Types 1 or 2 cable are used with data connector-equipped (DC) MAUs.

  • Page 24: Calculating Distances

    NOTE The distances given in the tables for Type 3 cable will require Black Box media filters (part number LT057) between the adapters and the network cable. Using another brand of media filter may result in decreased lobe...
  • Page 25 16-PORT TYPE 3 MAU XAMPLE This example illustrates a proper network plan using MAUs. All cable distances given assume that 24 gauge Type 3 cable is used in the network MAU 1 Third Floor Inter-closet wiring, 35 feet MAU 2 Patch cord, 1 foot MAU 3 Mau 3...

  • Page 26: Distance Charts

    16-PORT TYPE 3 MAU Completing the Installation Once the network has been thoroughly planned and all wiring has been routed to the work areas where network devices will be located, follow the procedure given in Section 3.4, Completing the Installation. 3.3 Distance Charts The charts on the following pages are used with the distance formula given in Section 3.2, Calculating Distances.
  • Page 27 16-PORT TYPE 3 MAU Table 3-1. 4-Mbps Distance Chart for Type 3 Cable (continued). Distances are given in feet (meters). Number Number of Wiring Closets of MAUs 22 Gauge 550 (168) 535 (163) 525 (160) 520 (158) 510 (155) 500 (152) 505 (154) 495 (151) 485 (148)
  • Page 28 16-PORT TYPE 3 MAU Table 3-1. 4-Mbps Distance Chart for Type 3 Cable (continued). Distances are given in feet (meters). Number Number of Wiring Closets of MAUs 425 (130) 415 (126) 405 (123) 395 (121) 385 (117) 410 (125) 400 (122) 390 (119) 380 (116) 370 (113)
  • Page 29 16-PORT TYPE 3 MAU Table 3-2. 16-Mbps Distance Chart for Type 3 Cable. Distances are given in feet (meters). Number Number of Wiring Closets of MAUs 19 Gauge 221 (67) 215 (66) 212 (65) 210 (64) 207 (63) 204 (62) 205 (62) 202 (62) 199 (61)
  • Page 30 16-PORT TYPE 3 MAU Table 3-2. 16-Mbps Distance Chart for Type 3 Cable (continued). Distances are given in feet (meters). Number Number of Wiring Closets of MAUs 190 (58) 187 (57) 184 (56) 182 (55) 179 (55) 184 (56) 182 (55) 180 (55) 176 (54) 174 (53)
  • Page 31 16-PORT TYPE 3 MAU Table 3-2. 16-Mbps Distance Chart for Type 3 Cable (continued). Distances are given in feet (meters). Number Number of Wiring Closets of MAUs 180 (55) 178 (54) 175 (53) 176 (54) 173 (53) 171 (52) 168 (51) 172 (52) 169 (52) 166 (51)

  • Page 32: Completing The Installation

    16-PORT TYPE 3 MAU 3.4 Completing the Installation 3.4.1 S TATION NITIALIZATION The station ports can be in an incorrect state for station attachment, and if they are, the MAU will be inoperable until the ports are reset. Use the reset button to reset them.

  • Page 33: Installation Procedure

    16-PORT TYPE 3 MAU 3.4.2 I NSTALLATION ROCEDURE Once the network has been thoroughly planned and all wiring has been routed to the work areas where network devices will be located, use this procedure to finish the installation. 1. If RJ-45-equipped MAUs are used, attach media filters to the network ports on the adapter cards in the attaching devices (unless the adapters are equipped with media filters).

  • Page 34: Problem Determination

    16-PORT TYPE 3 MAU 4. Problem Determination MAUs are designed for ease of use. By using the following guide, most problems can be quickly isolated and corrected. Procedure If an attaching device is validly connected to the network, the terminal port LED on the MAU will be on, and the attaching device should be able to communicate properly on the network.

  • Page 35: Glossary

    16-PORT TYPE 3 MAU 5. Glossary adapter—the card installed in a PC that allows the PC to access the token-ring network. ARL—adjusted ring length. This is the total length of the cable connecting MAUs in a single token ring, minus the shortest inter-MAU segment. attaching device—each device directly connected to the token ring.
  • Page 36 16-PORT TYPE 3 MAU token ring—a local area network (LAN) that uses the IEEE 802.5 Token Ring Access Method. type 1—the IBM Cabling System term for shielded twisted-pair cabling. See Section 1.3, Cable Specifications. type 2—same as type 1, except that the cable includes several pairs of ordinary telephone wire enclosed in the same outer sheath as the shielded data cable.
  • Page 37 © 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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