Allied Telesis CentreCOM AT-6870 User Manual Download Page 1

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Allied
Telesyn
International

CentreCOM MAC
Layer Bridge Models

AT-6870
AT-6875

User Manual

PN 613-10450-00

Summary of Contents for CentreCOM AT-6870

Page 1: ...Allied Telesyn International CentreCOM MAC Layer Bridge Models AT 6870 AT 6875 User Manual PN 613 10450 00...

Page 2: ...The information provided herein is subject to change without notice In no event shall Allied Telesyn be liable for any incidental special indirect or consequential damages whatsoever including but no...

Page 3: ...entreCOM Multiport Repeater Due to the danger of exposed high voltage DO NOT operate or apply power to this product when the cover is removed This unit should be opened only by a trained and qualified...

Page 4: ...his manual They are Notes Cautions and Warnings They are defined as follows Note This indicates a note of specific interest related to the immediate text in which it is found Caution This notice will...

Page 5: ...cation Guidelines 4 Overcoming Physical Limitations 4 Increasing Network Performance 4 Mixing Media 7 Fault Tolerance and Isolation 8 Using Backup Bridges 9 Installation and Operation 11 Unpacking 11...

Page 6: ...IEEE 802 3 10BASE2 Thin Ethernet 17 IEEE 802 3 10BASE5 Thick Ethernet 17 Propagation 17 IEEE 802 3 Four Repeater Rule 18 Network Frame Formats 19 Power Cords and Plugs 21 Glossary 23 Warranty and Ser...

Page 7: ...lity of a large network can be enhanced through subnetting with CentreCOM Bridge which allows heterogeneous sub networks to be interconnected The CentreCOM Bridges support high performance requirement...

Page 8: ...e year warranty Physical Description The CentreCOM MAC Layer Bridge is packaged in a sturdy two piece sheet metal enclosure with ventilation slots on the side and back All network attachments and powe...

Page 9: ...Fan vent Removable expansion slot cover The Ethernet lEEE ffO2 3 10BASE5 network connector uses screw lock fasteners to ensure secure connections These ports use a DA 15P male connector Product Code a...

Page 10: ...ere is effectively no limit on the number of nodes that can be attached to a bridged network there are some practical considerations Once again this is due to the delay introduced by each bridge throu...

Page 11: ...rue for small organizations which will only use one or two bridges or when previously disjointed networks are being interconnected Figure 4 below shows this kind of configuration Analysis of Large Net...

Page 12: ...The first is a cascaded network where a set of networks are connected together by a series of bridges An example of this configuration is given in Figure 6 A cascaded network is useful when a small n...

Page 13: ...tworks that use different media You may use Thin Ethernet on one channel and Ethernet on the other channel This is not a good enough reason to use a bridge however since inexpensive conversion devices...

Page 14: ...one network topology is used With a cascaded network a fault will split the network into two disjointed parts This is shown in Figure 10 In a backbone network two possibilities arise If the backbone f...

Page 15: ...ithin which to search for a problem Using Backup Bridges The CentreCOM MAC Layer Bridge uses the IEEE 802 1 draft standard STP to determine the network topology If more than one bridge is connected be...

Page 16: ...ly resilient to failure Unlike a normal bridged network which minimizes the loss of network availability networks with backup bridges may eliminate loss of availability even with multiple network fail...

Page 17: ...nches of clearance between these vents and any other object Failure to follow these ventilation guidelines may result in overheating and eventual damage of the bridge Factory Configuration The CentreC...

Page 18: ...l 1 is set at the factory to operate with Ethernet or IEEE 803 2 10BASE5 Setting Channel 1 for Thin Ethernet Operation 1 Remove any transformer in position T4A 2 Install the transformer into position...

Page 19: ...the diagnostic tests the DIAG LED will be turned OFF If any tests fail the DIAG LED will remain ON In the latter case the bridge should be resumed for service Normal Operation Under normal operation...

Page 20: ...remove the power cord from the bridge Remove the cover and inspect the intemal configuration Refer to the earlier section on bridge configuration for the correct settings and make sure that 1 All shun...

Page 21: ...M 128K Frame Buffer RAM 32 bytes EPROM 512K system RAM Performance Forwarding Rate 12 500 packets per second Filtering Rate 25 000 packets per second Physical Characteristics Dimensions 43 2 cm x 24 7...

Page 22: ...Specifications 16 Accessories Part No Description AT RKMT 2 Rackmount kit for 19 in rack AT RKMT 3 Rack mount ears kit for 19 in rack AT 1250 UL listed power cord ATBRKT 13 Cable strain relief...

Page 23: ...he segment must be terminated with a 50 termination with a power rating of 5 watts or greater Earth grounding of the segment shield must take place only at one point on the cable IEEE 802 3 10BASE5 Th...

Page 24: ...gments and no other attachments may be on the linking segments If attachments are present on the repeater coax link segments then no more than two repeaters linking three segments may be configured Th...

Page 25: ...a packet type by Ethernet and as a packet length by IEEE 802 3 Figure 15 shows the Ethernet and IEEE 802 3 frame formats The CentreCOM MAC Layer Bridge only inspects the frame source and destination...

Page 26: ...me higher level protocol Many vendors interfaces can recognize both IEEE 802 3 and Ethernet frames on the same network This is done by using Ethernet packet types that are greater than the maximum fra...

Page 27: ...power cords may be used with the CentreCOM MAC Layer Bridge shown below The power cord selected should meet all regulations such as maximum length and range which apply in the country of operation The...

Page 28: ...the shape of the connector shell Also called miniature D DB 15 or DIX connectors DIX CONNECTOR see D CONNECTORS DTE Data Terminal Equipment is connected to the MAU with an AUI cable The DTE could be...

Page 29: ...ontrol Out circuit A and B Voltage Plus and Voltage Common N SERIES A barrel shaped threaded connector used on 10BASE5 thick Ethernet coaxial cable PROPAGATION DELAY The time it takes a signal to trav...

Page 30: ...eturning the product to ATI and only after receiving authorization by ATI by issuance of a Return Material Authorization RMA number with shipping charges prepaid in the original shipping container or...

Page 31: ...h the use or performance of the product delivered hereunder Some governments do not allow the exclusion or limitation of incidental or consequential damages for consumer products so the above limitati...

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