Andrew 8212 User manual

Document 402-0508-01

Revision B

Lobe Access Unit

User’s Guide

Models 8212 and 8214

®

Andrew Corporation

2235 First Street, Suite #115

Simi Valley, CA 93065

Sales (800) 328-2969

Technical Support (800) 8 ANDREW

No part of this document may be copied in any form or by any means

without the prior written consent of Andrew Corporation.

All drawings, schematics and artwork used in the manufacture of products

described herein are copyrighted. Reproduction of said drawings,

schematics and artwork or manufacture of said products without written

consent of Andrew Corporation is absolutely prohibited.

IBM is a registered trademark of International Business Machines

Corporation. Belden and Beldfoil are a registered trademark of Belden

Division of Cooper Industries, Inc.

Printed in the U.S.A.

Doc. No. 402-0508-01 Revision B – February 1997

The United States Government Federal Communications Commission has

specified that the following notice be brought to the attention of users of

this product:

Warning

This equipment generates, uses, and can radiate radio frequency

energy and if not installed and used in accordance with the

instruction manual, may cause interference with radio

communications. It has been tested and found to comply with the

limits for a Class A computing device pursuant to Subpart J of Part

15 of FCC Rules, which are designed to provide reasonable protection

against such interference when operated in a commercial

environment. Operation of this equipment in a residential area is

likely to cause interference in which case the user, at his own expense,

will be required to take whatever measures may be required to

correct the interference.

i

TABLE OF CONTENTS

CHAPTER ONE Introduction ............................ 1

1.1 Andrew LAUs ..................................... 1

1.2 Related Publications ................................ 3

CHAPTER TWO Hardware .............................. 5

2.1 Specifications ..................................... 5

Electrical ........................................ 5

Physical ......................................... 5

2.2 LEDs ........................................... 6

2.3 Connectors ....................................... 7

RJ45 Connectors ................................... 7

Data Connectors ................................... 8

2.4 Cable Specifications ............................... 10

Category 5 Cable .................................. 10

Type 3 Cable (RJ45 Connector Modules) ................ 10

Type 1 and Type 2 Cable ............................ 11

Type 1 Cable (Data Connector Modules) ................. 12

Cable Lengths .................................... 12

CHAPTER THREE Installation ............................. 13

3.1 Installation Background ............................. 13

Main Ring ...................................... 14

Backup Path ..................................... 15

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Lobe Access Unit User’s Guide

Adjusted Lobe Length .............................. 18

Adjusted Ring Length .............................. 18

Lobe Length ..................................... 19

Cable Type ...................................... 19

Repeaters ....................................... 19

Bridges ......................................... 19

16 Mb Token Rings ................................ 20

3.2 Calculating Distances ............................... 20

Example ........................................ 21

3.3 Distance Charts ................................... 22

4 Mb Distance Charts ............................... 23

16 Mb Distance Charts .............................. 25

3.4 LAU Installation .................................. 27

Setup Aid ....................................... 28

CHAPTER FOUR Problem Determination ................... 29

Procedure ....................................... 29

GLOSSARY ............................................ 31

1

CHAPTER ONE Introduction

1.1 Andrew LAUs

Andrew Lobe Access Units (LAUs) are typically used as Token Ring

network add-on devices, which are installed at the user’s office. They

increase the number of devices that may be attached over a single lobe

access cable to its connected MAU lobe port in the wiring closet.

Figure 1. Typical MAU/LAU configuration

Introduction

2

Lobe Access Unit User’s Guide

Andrew LAUs are non-powered, with status LEDs powered by the

attaching devices. They are available in four models with either data

connectors or RJ45 connectors. Model 8212 has two port channels with

either data connectors or RJ45 connectors. Model 8214 has four port

channels with either data connectors or RJ45 connectors. The four

different LAU models are shown below.

Figure 2. LAU Models 8212 and 8214

Introduction

3

1.2 Related Publications

The user’s guide for the Multistation Access Unit (MAU) to which the

Lobe Access Unit (LAU) will connect.

Andrew LAU QuickStart Guide, 402-0508-10

Andrew Token Ring Network Planning Guide, Bulletin 1565

Andrew Multistation Access Unit User’s Guide, 402-0067-01

Andrew MAUi/8700 Media Management Program User’s Guide,

402-0118-01

IBM Token-Ring Network Introduction and Planning Guide,

GA27-3677-1

IBM Token-Ring Network Installation Guide, GA27-3678

IBM Token-Ring Network Telephone Twisted-Pair Media Guide,

GA27-3714-4

Introduction

4

Lobe Access Unit User’s Guide

5

CHAPTER TWO Hardware

2.1 Specifications

The Andrew LAU’s specifications are listed below.

Electrical

Power: Andrew LAUs are non-powered

Physical

Height: Model 8212, 1.75 inches; model 8214, 1.75 inches.

Width: Model 8212, 6.5 inches; model 8214, 11.35 inches

Depth: Model 8212, 6 inches; model 8214, 6 inches

Lobe Ports: 2 or 4, RJ45 or data connectors

Main Ring Port: 1, RJ45 or data connector

Humidity: Up to 95% non-condensing

Operating Temperature: 0ºC to 55ºC

Altitude: 10,000 feet (3 km) maximum

Hardware

6

Lobe Access Unit User’s Guide

2.2 LEDs

Andrew LAUs provide a Port Channel LED for each Port Channel

connector as shown in the illustration below.

Figure 3. Port Channel LEDs

The Port Channel LED illuminates only when the device that is attached

to the channel is powered up and is connected with a working cable. The

Port Channel LED receives its power from the phantom voltage generated

by the attaching device. If the device is powered down or the cable

between the device and the port channel is broken, the Port Channel LED

will not illuminate.

Hardware

7

2.3 Connectors

Each LAU model is equipped with one Main port connector and either

two or four port channel connectors. The Main port must be connected to

a lobe port on the MAU. The attaching device must be connected to the

LAU port channel connectors.

The type of connector (RJ45 or data connector) installed on your LAU

depends on the particular Andrew LAU model that you purchased.

RJ45 Connectors

The diagram shows the transmit and receive pins in the Main and Port

Channel RJ45 connectors.

Main Port

Connector

Channel Port

Connector

Pin 1 Pin 1

Transmit

Pins 3 & 6

Receive

Pins 3 & 6

Transmit

Pins 4 & 5

Receive

Pins 4 & 5

Figure 4. RJ45 connector transmit and receive pins

RJ11 male connectors may be used instead of RJ45 male connectors on

the twisted pair cables used in the network. Both types will work in the

female connectors on the LAUs. Whether RJ45 or RJ11 male connectors

are used, the transmit and receive pins are always the four center pins in

the connector as shown in the illustration above..

Hardware

8

Lobe Access Unit User’s Guide

Important Note:

The RJ45 connector cable used with your LAUs must have at least

two twisted pairs of wire for data, no matter what cable type is used.

The cable must be wired straight-through, as shown in Figure 5. Do

not connect transmit and receive wires in the same twisted pair; the

illustration below shows how to avoid this.

Figure 5. Correct RJ45 connector and cable wiring

Data Connectors

The diagram below shows the transmit and receive pins in the Main and

Port Channel data connectors.

Figure 6. Data connector transmit and receive pins

Hardware

9

Important Note:

The data connector cable used with your LAUs must have at least two

twisted pairs of wire for data. The cable must be wired straight-

through, as shown in Figure 7. Do not connect transmit and receive

wires in the same twisted pair of wires; the illustration below shows

how to avoid this.

Figure 7. Straight-through data connector and cable wiring

Hardware

10

Lobe Access Unit User’s Guide

2.4 Cable Specifications

The following paragraphs list specifications for the different kinds of

cables which can be used with Andrew LAUs.

Category 5 Cable

This cable has been defined by the EIA/TIA as the cable of choice for

data applications up to 100 Mbps. See EIA/TIA specification #568 A/B

for building wiring recommendations.

• UTP and STP available

• 22 and 24 gauge generally available

• Impedance 100 ohms ± 15% from 512 kHz to 100 MHz

• Maximum attenuation is 67.0 dB per 1,000 at 100 MHz.

Type 3 Cable (RJ45 Connector Modules)

The UTP Type 3 (levels 3 and 4) cable used with RJ45-equipped LAUs

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:

• Solid copper twisted pairs, with at least two twists per foot

• A maximum DC resistance of 28.6 ohms per 1000 feet for level

3, and 27 ohms per 1000 feet for level 4

• Characteristic impedance for level 3

—

90 to 120 ohms at 256 kHz

—

87 to 117.5 ohms at 512 kHz

—

85 to 114 ohms at 772 kHz

—

84 to 113 ohms at 1000 kHz

• Characteristic impedance for level 4 is 100 ohms at 1 – 16 MHz

• Maximum attenuation per 1000 feet for level 3

—

4.00 dB at 256 kHz

—

5.66 dB at 512 kHz

—

6.73 dB at 772 kHz

—

8.00 dB at 1000 kHz

Hardware

11

• Maximum attenuation per 1000 feet for level 4

—

5.00 dB at 1 MHz

—

22.00 dB at 16 MHz

NOTE:

Commonly available consumer telephone cable, sometimes called

“flat cable” or “silver satin,” should not be used. This type of cable

can drastically reduce the cable lengths possible in your network.

Exceptions to this are the patch cables used to connect MAUs in the

same wiring closet in 4 Mbps networks; they may be made of this

type of cable, but they should be no more than three feet in length. In

16 Mbps networks, however, silver satin of any length should not be

used.

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.

Type 1 and Type 2 Cable

Type 1 is the IBM Cabling System term for shielded twisted pair (STP)

data cable. It consists of two twisted pairs of 22 AWG solid conductor

wire enclosed in a tinned copper braid shield, and it's covered with an

appropriate sheath. The sheath material varies according to whether or not

the cable will be used in an environmental air duct. There is also a variety

of Type 1 for outdoor use.

Type 2 cable is the same as Type 1 cable in that it has two shielded

twisted pairs of 22 AWG wire for data communication. It differs from

Type 1 in that the cable sheath also contains four twisted pairs of

unshielded 22 AWG solid conductor wire for telephones.

Hardware

12

Lobe Access Unit User’s Guide

Types 1 and 2 cable must be used with data connectors (also known as

IEEE 802.5 Medium Interface Connectors) because of the need to

terminate the cable shielding. Types 1 and 2 cable and data connectors are

available from IBM distributors and from other suppliers such as Belden

or Alpha.

Type 1 Cable (Data Connector Modules)

Standard non-plenum and plenum IBM Type 1 cables should be used with

LAUs equipped with data connectors. Recommended wire gauge is 22

AWG. The following requirements should be met:

• Solid copper in two pairs

• A maximum DC resistance of 17.4 ohms per 1000 feet

• Characteristic impedance of 150 ohms at 3-20 MHz

• Maximum attenuation per 1000 feet

—

7 dB at 4 MHz

—

14 dB at 16 MHz

• Maximum continuous current per conductor at 2.3 amp

• UL specification

—

UL Type CM (non-plenum)

—

UL Type CMP (plenum)

• Beldfoil shield type at 100% coverage

• Data connector model number ADC-205

Cable Lengths

The maximum lengths of the cables that connect the attaching devices to

the LAU port Channels and the Main port of the LAU to a MAU lobe port

depend on the data rate (4 or 16 Mbps), the type of token ring device, and

the type of port from which the cable is connected. See

Section 3.1,

Installation Background.

13

CHAPTER THREE Installation

3.1 Installation Background

This section gives general information on planning the network using

Andrew LAUs along with one or more MAUs.

Careful network planning is important before installing your MAUs,

LAUs, and attaching devices. The most important factors for the physical

part of the network are:

• Main ring length and distance between MAUs

• Length of the lobes attaching MAUs to devices, including any

adjusted lobe lengths adjustments that may need to be made to

include LAU lobe lengths.

• Number of wiring closets

• Verifying that the proper type of cable is used (see Section 2.4,

Cable Specifications.)

• Safeguarding against electrical interference, especially when

UTP cable is used.

A copy of the floor plans of the buildings that will use the token ring

network will help greatly in planning the installation. For more

information, see Section 1.2, Related Publication.

NOTE:

When using Type 3 cable with 4 Mb token rings, Andrew CTD-440C

Media Filters must be used to take full advantage of the lobe lengths

stated in this chapter. When using Type 3 cable at 16 Mb, Andrew

CTD-416C Media Filters must be used. Using another brand of media

filter may result in decreased lobe length.

Installation

14

Lobe Access Unit User’s Guide

Main Ring

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 LAUs or attaching devices (these cables are

called lobes).

Figure 8. Main Ring

If there is only one MAU for the entire ring, the main ring can be

considered to have no length for installation purposes.

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