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 [phone]
Technical Support (800) 8 ANDREW

© 1997 Andrew Corporation. All rights reserved.
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

ii 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
2Lobe 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
4Lobe Access Unit User’s Guide