MRx20T(UTP)Ver6_Book Page i Thursday, April 3, 1997 5:18 PM CentreCOM ® AT-MR420T AT-MR820T Multiport Micro Repeaters Installation Guide PN 613-10624-00 Rev A
MRx20T(UTP)Ver6_Book Page ii Thursday, April 3, 1997 5:18 PM Copyright 1997 Allied Telesyn International Corp. All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn International Corp. Allied Telesyn International Corp. reserves the right to make changes in specifications and other information contained in this document without prior written notice. The information provided herein is subject to change without notice.
MRx20T(UTP)Ver6_Book Page iii Thursday, April 3, 1997 5:18 PM Electrical Safety and Installation Requirements STANDARDS: This product meets the following standards U.S. Federal Communications Commission RADIATED ENERGY Note: This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
MRx20T(UTP)Ver6_Book Page iv Thursday, April 3, 1997 5:18 PM INSTALLATION ELECTRICAL—AUTO VOLTAGE ADJUSTMENT This product will automatically adjust to any voltage between the ranges shown on the label. ELECTRICAL—TYPE CLASS 1 EQUIPMENT THIS EQUIPMENT MUST BE EARTHED. Power plug must be connected to a properly wired earth ground socket outlet. An improperly wired socket outlet could place hazardous voltages on accessible metal parts. ELECTRICAL—CORD NOTICE Use power cord, maximum 4.
MRx20T(UTP)Ver6_Book Page v Thursday, April 3, 1997 5:18 PM NETZKABEL Das Netzkabel sollte eine maximale Länge von 4,5 Metern, einen Nennwert von mindestens 6 A und 250 V haben, aus HAR-Material hergestellt und mit einer gepreßten, IEC 320 entsprechenden, Anschlußverbindung an einem Ende, und am anderen Ende mit einem im Land des Endverbrauchers geprüften Stecker ausgestattet sein. Die Entlüftungsöffnungen dürfen nicht versperrt sein und müssen zum Kühlen freien Zugang zur Raumluft haben.
MRx20T(UTP)Ver6_Book Page vi Thursday, April 3, 1997 5:18 PM Ventilationsåbninger må ikke blokeres og skal have fri adgang til den omgivende luft i rummet for afkøling. BETJENINGSTEMPERATUR Dette apparat er konstrueret til en omgivende temperatur på maksimum 50 grader C. ALLE LANDE: Installation af produktet skal ske i overensstemmelse med lokal og national lovgivning for elektriske installationer. Eisen: Dit product voldoet aan de volgende eisen.
MRx20T(UTP)Ver6_Book Page vii Thursday, April 3, 1997 5:18 PM NORMES: ce produit est conforme aux normes de suivantes : Emission d’interférences radioélectriques EN55022 Classe A MISE EN GARDE: dans un environnement domestique, ce produit peut provoquer des interférences radioélectriques. Auquel cas, l’utilisateur devra prendre les mesures adéquates. Immunité EN50082 - 1 NORMES: ce produit est conforme aux normes de suivantes.
MRx20T(UTP)Ver6_Book Page viii Thursday, April 3, 1997 5:18 PM Standardit: Tämä tuote on seuraavien standardien mukainen. Radioaaltojen häirintä EN55022 Luokka A VAROITUS: Kotiolosuhteissa tämä laite voi aiheuttaa radioaaltojen häiröitä, missä tapauksessa laitteen käyttäjän on mahdollisesti ryhdyttävä tarpeellisiin toimenpiteisiin. Kestävyys EN50082-1 Standardit: Tämä tuote on seuraavien standardien mukainen.
MRx20T(UTP)Ver6_Book Page ix Thursday, April 3, 1997 5:18 PM Standard: Questo prodotto è conforme ai seguenti standard. Emissione RFI (interferenza di radiofrequenza) EN55022 Classe A AVVERTENZA: in ambiente domestico questo prodotto potrebbe causare radio interferenza. In questo caso potrebbe richiedersi all’utente di prendere gli adeguati provvedimenti. Immunità EN50082-1 Standard: Questo prodotto è conforme ai seguenti standard.
MRx20T(UTP)Ver6_Book Page x Thursday, April 3, 1997 5:18 PM Sikkerhetsnormer: Dette produktet tilfredsstiller følgende sikkerhetsnormer. RFI stråling EN55022 Klasse A ADVARSEL: Hvis dette produktet benyttes til privat bruk, kan produktet forårsake radioforstyrrelse. Hvis dette skjer, må brukeren ta de nødvendige forholdsregler. Immunitet EN50082-1 Sikkerhetsnormer: Dette produktet tilfredsstiller følgende sikkerhetsnormer.
MRx20T(UTP)Ver6_Book Page xi Thursday, April 3, 1997 5:18 PM Padrões: Este produto atende aos seguintes padrões. Emissão de interferência de radiofrequência EN55022 Classe A AVISO: Num ambiente doméstico este produto pode causar interferência na radiorrecepção e, neste caso, pode ser necessário que o utente tome as medidas adequadas. Imunidade EN50082-1 Padrões: Este produto atende aos seguintes padrões.
MRx20T(UTP)Ver6_Book Page xii Thursday, April 3, 1997 5:18 PM Estándares: Este producto cumple con los siguientes estándares. Emisión RFI EN55022 Clase A ADVERTENCIA: en un entorno doméstico, este producto puede causar radiointerferencias, en cuyo caso, puede requerirse del usuario que tome las medidas que sean convenientes al respecto. Inmunidad EN50082-1 Estándares: Este producto cumple con los siguientes estándares.
MRx20T(UTP)Ver6_Book Page xiii Thursday, April 3, 1997 5:18 PM Standarder: Denna produkt uppfyller följande standarder. Radiostörning EN55022 Klass A VARNING: Denna produkt kan ge upphov till radiostörningar i hemmet, vilket kan tvinga användaren till att vidtaga erforderliga åtgärder. Immunitet EN50082-1 Standarder: Denna produkt uppfyller följande standarder. Dessa produkter har säkerhetstestats av UL i enlighet med Standard 1950, av CSA i enlighet med CSA 950, och av TUV i enlighet med EN60950.
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MRx20T(UTP)Ver6_Book Page xv Thursday, April 3, 1997 5:18 PM Table of Contents Electrical Safety and Installation Requirements . . . . . . . . . . . . . . . . . .iii About This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx Contacting ATI Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx Telephone and Fax .
MRx20T(UTP)Ver6_Book Page xvi Thursday, April 3, 1997 5:18 PM Chapter 3 Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Three Media Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ethernet Network Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUI Port . . . . . . . .
MRx20T(UTP)Ver6_Book Page xvii Thursday, April 3, 1997 5:18 PM Appendix E Where To Find Us . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Appendix F Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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MRx20T(UTP)Ver6_Book Page xix Thursday, April 3, 1997 5:18 PM About This Guide This guide is written for system administrators who are responsible for configuring, monitoring, and maintaining a Local Area Network (LAN) of which Allied Telesyn’s multiport AT-MR420T and AT-MR820T Micro Repeaters are components. This guide serves as an installation guide and reference guide for both products.
MRx20T(UTP)Ver6_Book Page xx Thursday, April 3, 1997 5:18 PM About This Guide Document Conventions The following conventions are used in presenting information in this guide: Note A note provides additional information or describes the possible consequence of a specific action you can perform.
MRx20T(UTP)Ver6_Book Page xxi Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide Internet Mail You can send electronic mail via the Internet to: tech_support@centre.com CompuServe Forum ATI has a forum on CompuServe. You can reach us by typing go allied at the CompuServe prompt (!).
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MRx20T(UTP)Ver6_Book Page 1 Thursday, April 3, 1997 5:18 PM Chapter 1 Product Description Overview Allied Telesyn’s multiport AT-MR420T/AT-MR820T Micro Repeaters are a compact, inexpensive solution for all Ethernet media conversions and Local Area Network (LAN) applications. The AT-MR420T/AT-MR820T Micro Repeaters combine 10 Mbps Ethernet connectivity with the same features and functionality of larger, more expensive repeaters.
MRx20T(UTP)Ver6_Book Page 2 Thursday, April 3, 1997 5:18 PM Product Description Figure 1: AT-MR420T Front and Back Panels Figure 2: AT-MR820T Front and Back Panels 2
MRx20T(UTP)Ver6_Book Page 3 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide Features The AT-MR420T/AT-MR820T Micro Repeaters have incorporated the latest technologies, including a custom Application Specific Integrated Circuit (ASIC) and Surface Mount Technology (SMT). These result in enhanced functionality, increased reliability, and improved performance. The AT-MR420T/AT-MR820T Micro Repeaters have the following features: ❑ IEEE 802.
MRx20T(UTP)Ver6_Book Page 4 Thursday, April 3, 1997 5:18 PM Product Description Jabber Lock-up Protection. Jabber lock-up protects the repeater from being overrun with data packets by isolating segments with transmitted packets that exceed the maximum packet length. That is, jabber lock-up automatically prevents transmitted data from reaching the repeater if the transmitted data time exceeds a specified duration (usually 5 ms).
MRx20T(UTP)Ver6_Book Page 5 Thursday, April 3, 1997 5:18 PM Chapter 2 Installation Site Requirements Ventilation The AT-MR420T/AT-MR820T Micro Repeaters have grilled openings on both sides for ventilation. Although these micro repeaters do not require an internal fan, adequate ventilation is required. Note Make sure that the ventilation openings located on the sides of the chassis are never blocked. Maximum ambient temperature is 104o F (40o C).
MRx20T(UTP)Ver6_Book Page 6 Thursday, April 3, 1997 5:18 PM Installation 1. Carefully unpack the repeater. Keep the packing materials until you have successfully installed the product. 2. Place the repeater in a location with adequate ventilation and power receptacles. 3. Apply power to the repeater by attaching the power cable. Make sure that the POWER LED on the front panel is lit. 4. If you are connecting to a backbone network, prepare the AUI cable for attachment. 5.
MRx20T(UTP)Ver6_Book Page 7 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide Attach a second 10Base-T UTP RJ45 connector to 10Base-T network port 2. The Port 2 LINK OK LED on the front panel should now light, provided the 10Base-T device on the opposite end of the UTP cable is operational. AUI Network Port Each repeater has one AUI port to accommodate a 10Base5 (standard or thick Ethernet cable) connection to the network backbone using an AUI.
MRx20T(UTP)Ver6_Book Page 8 Thursday, April 3, 1997 5:18 PM Installation Port Status Indicators Associated with each 10Base-T (RJ45) network port are the two Port status LEDs. These LEDs indicate whether the port is linked, receiving data, or both. See Figure 5. Note A data packet is too fast for the human eye to distinguish on an LED, therefore the LEDs will not reflect real-time activity. The repeater artificially stretches the LED “on” time for easier observation.
MRx20T(UTP)Ver6_Book Page 9 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide In general, Port status LEDs show the functionality of the port. If the LINK OK status light is green and the Receive status is flashing amber, a signal is being received and the segment attached to the port is functional. If there is no link light, there is no signal continuity. Check that the attached DTE is ON and that the proper cable is being used.
MRx20T(UTP)Ver6_Book Page 10 Thursday, April 3, 1997 5:18 PM Installation Table 1: Hub Status LEDS LED Color Description POWER Green Lights when power is applied COLLISION1 Amber Flashes indicating an SQE or excessive frame collisions ACTIVITY Green Indicates that the repeater is functional and is transmitting packets 1Occasional collisions are normal in Ethernet networks. A constantly lit Collision LED may indicate that there is a port with excessive traffic problems.
MRx20T(UTP)Ver6_Book Page 11 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide Note The LINK OK LED validates the receive pair only. The opposite end of the UTP segment is responsible for validating the transmit pair.
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MRx20T(UTP)Ver6_Book Page 13 Thursday, April 3, 1997 5:18 PM Chapter 3 Connectivity Three Media Connectors This repeater has three port types and associated connectors: ❑ AC power port ❑ 10Base 5 (AUI) network backbone port ❑ Four/Eight Unshielded Twisted Pair (UTP) 10Base-T (RJ45) ports AC Power Connector While it is common to use dedicated power circuits or power conditioners to supply power to network devices, the source must be able to provide AC power at 100-120/200-240 VAC and 60/50 Hz.
MRx20T(UTP)Ver6_Book Page 14 Thursday, April 3, 1997 5:18 PM Connectivity Figure 7: Power Connector 14
MRx20T(UTP)Ver6_Book Page 15 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide Ethernet Network Specifications Table 2 provides an overview of the IEEE 802.3 specifications for ethernet configurations using thick, thin, and twisted-pair wiring. Table 2: IEEE 802.
MRx20T(UTP)Ver6_Book Page 16 Thursday, April 3, 1997 5:18 PM Connectivity Figure 8: AUI Network Port 10Base5 (Thick) Ethernet Cable. When configuring 10Base5 coax segments, IEEE 802.3 specifications allow a maximum of 100 MAU attachments, spaced at multiples of 2.5 meters (8.2 feet) measured accurately from the cable end (50 Ω terminator included). The 10Base5 cable segment should not exceed 500 meters (1,640 feet). Worst-case “end-to-end” propagation delay of a 10Base5 coax segment is 2165 ns.
MRx20T(UTP)Ver6_Book Page 17 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide UTP (RJ45) Connector Figure 9 shows a UTP cable with RJ45 connectors. For a 10Base-T link between a repeater and a Medium Attachment Unit (MAU) or Network Interface Controller (NIC), the cable is wired straight through. Figure 9: RJ45 Connector 10Base-T UTP cables can be 100 meters (328 feet). The cable should be 22 to 26 AWG UTP wire with 100 Ω impedance.
MRx20T(UTP)Ver6_Book Page 18 Thursday, April 3, 1997 5:18 PM Connectivity Hub to MAU Wiring. The most typical UTP cable for the AT-MR420T/ AT-MR820T Micro Repeaters is UTP Hub to UTP transceiver Data Terminal Equipment (DTE).
MRx20T(UTP)Ver6_Book Page 19 Thursday, April 3, 1997 5:18 PM Chapter 4 Topology Standalone Topology Figure 10 shows a standalone topology. Four workstations are connected directly to the repeater through the repeater’s RJ45 ports.
MRx20T(UTP)Ver6_Book Page 20 Thursday, April 3, 1997 5:18 PM Topology Cascade Topology A shared Ethernet network can be expanded by interconnecting repeaters (cascading) through the UTP ports. Figure 11: AT-MR820T Four Cascaded Repeaters Figure 11 shows a cascaded topology using four repeaters which is the maximum number of micro repeaters and nodes allowed in a single segment: four micro repeaters with ten (AT-MR420T) or twenty-six (AT-MR820T) ports. Its design complies with the four-repeater rule.
MRx20T(UTP)Ver6_Book Page 21 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Backbone Networks The most straightforward topology is a backbone network. Figure 12 show a backbone network topology with the AUI port attaching to a coaxial Ethernet cable.
MRx20T(UTP)Ver6_Book Page 22 Thursday, April 3, 1997 5:18 PM Topology MDI/MDI-X Switch and Uplink Port While any RJ45 port can be used to cascade repeaters, port 4/8 has been specifically designed with an uplink (cascading) capability, by providing a Media Dependent Interface (MDI/MDI-X) switch.
MRx20T(UTP)Ver6_Book Page 23 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T The default setting for the RJ45 pinout switch is MDI-X (standard RJ45 port), which means the slide switch is to the right. ❑ In the default MDI-X configuration you can connect the 10Base-T port to a workstation or to any other DTE (that is, node).
MRx20T(UTP)Ver6_Book Page 24 Thursday, April 3, 1997 5:18 PM Topology 10Base5 Backbone Figure 14 illustrates a single multiport 10Base-T AT-MR420T/ AT-MR820T Micro Repeaters connecting to a thick Ethernet backbone using a transceiver.
MRx20T(UTP)Ver6_Book Page 25 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Fiber Optic Backbone By attaching a fiber optic transceiver, the AUI port can connect your network to a fiber optic (10Base-FL/FOIRL) cable backbone.
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MRx20T(UTP)Ver6_Book Page 27 Thursday, April 3, 1997 5:18 PM Appendix A Technical Specifications The AT-MR420T/AT-MR820T Specifications Physical Height 37.6 mm (1.55 in.) Width 332 mm (13 in.) Depth 112 mm (4.4 in.
MRx20T(UTP)Ver6_Book Page 28 Thursday, April 3, 1997 5:18 PM Technical Specifications Diagnostic LEDs Individual port link status (4/8) Individual port receive activity (4/8) Hub status (3), specifying: ❑ Both Transmit and Receive activity ❑ Collision ❑ Power Certification Safety UL 1950, CSA 22.2 No.
MRx20T(UTP)Ver6_Book Page 29 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide Each twisted-pair link segment must have a male connector attached to both ends. According to the 10Base-T specification, pins 1 and 2 on the connector are used for transmitting data; pins 3 and 6 are used for receiving data.
MRx20T(UTP)Ver6_Book Page 30 Thursday, April 3, 1997 5:18 PM Technical Specifications 5 - 4 - 3 Rule In addition to the requirements outlined in Chapter 3, Table 2, follows the “5-4-3 rule” to ensure that your configuration does not exceed the maximum 10Base5 data transmission path (the longest path through any given network). The 5-4-3 rule describes the maximum path between any two devices or nodes (PCs or other stations) on the network.
MRx20T(UTP)Ver6_Book Page 31 Thursday, April 3, 1997 5:18 PM Appendix B Glossary 10Base2—Also called thin Ethernet, thinnet or CheaperNet, a 10 MHz baseband specification. Cable impedance is 50 Ω and maximum coaxial segment length is 185 meters (606 ft.). 10Base5—Also called thick Ethernet, a 10 MHz baseband specification. Cable impedance is 50 Ω and maximum coaxial segment is 500 meters (1,640 ft.). The cable is commonly referred to as yellow cable.
MRx20T(UTP)Ver6_Book Page 32 Thursday, April 3, 1997 5:18 PM Glossary medium (coax cable) for data packet transmission. It provides for a level of error detection should that transmission be corrupted or impeded by contention for the transmission medium. COAX SEGMENT—A segment of Ethernet cable that contains MAUs. COAXIAL CABLE—A two-conductor (center conductor, shield system), concentric, constant impedance transmission line used as the trunk medium in the baseband system.
MRx20T(UTP)Ver6_Book Page 33 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide HUB/REPEATER—A hub is a central signal distributor. It is used in a wiring topology consisting of several point-to-point segments originating from a central point. The term hub is often used interchangeably with the term repeater. Multiport 10Base-T, 10Base2 and fiber optic (10Base-FL, FOIRL) repeaters are considered hubs. See Repeater.
MRx20T(UTP)Ver6_Book Page 34 Thursday, April 3, 1997 5:18 PM Glossary MEDIUM ATTACHMENT UNIT (MAU)—In a LAN, a device used in a data station to couple the DTE to the transmission medium. MEDIUM DEPENDENT INTERFACE (MDI)—The mechanical and electrical interface between a hub and a transceiver (MAU). MDI-X is another version of the interface that enables hubs to connect using different pin-outs, thereby avoiding conflicts that occur when receiving and transmitting packets use the same pin-out.
MRx20T(UTP)Ver6_Book Page 35 Thursday, April 3, 1997 5:18 PM AT-MR420T and AT-MR820T Installation Guide SQE TEST—Commonly referred to as Heartbeat, is a special 802.3 signal sent by the MAU to the DTE to test the collision detection function. Some DTE want SQE and others do not. Repeaters do not want the SQE Test. STRAIGHT-THROUGH—A type of wiring connection where the pins of one connector connect to the same pins of another connector.
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MRx20T(UTP)Ver6_Book Page 37 Thursday, April 3, 1997 5:18 PM Appendix C Technical Support Fax Order Name___________________________________________________________ Company ________________________________________________________ Address _________________________________________________________ City ____________________ State/Province ____________________________ Zip/Postal Code _______________ Country ____________________________ Phone ___________________________ Fax ____________________________ Inciden
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MRx20T(UTP)Ver6_Book Page 39 Thursday, April 3, 1997 5:18 PM Appendix D CentreCOM AT-MR420T/AT-MR820T Installation Guide Feedback Please tell us what additional information you would like to see discussed in the guide. If there are topics you would like information on that were not covered in the guide, please photocopy this page, answer the questions and fax or mail this form back to Allied Telesyn International Corp. The mailing address and fax number are at the bottom of the page.
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MRx20T(UTP)Ver6_Book Page 41 Thursday, April 3, 1997 5:18 PM Appendix E Where To Find Us For Technical Support or Service Location Phone Fax Asia Singapore, Taiwan, Thailand, Malaysia, Indonesia, Korea, Philippines, China, India (+65) 3815-613 (+65) 3833-830 Australia Australia, New Zealand (612) 416-0619 (612) 416-9764 France France, Belgium, Luxembourg, The Netherlands, Middle East, Africa (+33) 1-60-92-15-32 (+33) 1-69-28-37-49 Germany Germany, Switzerland, Austria, Eastern Europe (+49) 30
MRx20T(UTP)Ver6_Book Page 42 Thursday, April 3, 1997 5:18 PM Where To Find Us For Sales Information Australia Lindfield, NSW Tel: (612) 416-0619, Fax: (612) 416-9764 Canada Rexdale, Ontario Tel: (416) 675-6738, Fax: (416) 675-0057 Richmond, British Columbia Tel: (604) 244-0678, Fax: (604) 270-3644 England Abingdon, Oxon Tel: (+44) 1235-442500, Fax: (+44) 1235-442590 France Les Ulis Tel: (+33) 1-60921525, Fax: (+33) 169-28-37-49 Germany Berlin Tel: (+49) 30-435-90-00, Fax: (+49) 30-435-706-50 Freising Tel:
MRx20T(UTP)Ver6_Book Page 43 Thursday, April 3, 1997 5:18 PM Appendix F Index Numerics 10Base-T 15 A application specific integrated circuit (ASIC) 3 F features 3 auto partitioning 3 jabber lock-up protection 4 link integrity 3 regeneration 3 B backbone fiber optic 25 H hub status power 10 C cabling 10Base2 15 10Base5 4, 7, 15 10Base5 (thick) ethernet 16 10Base-FL 25 10Base-T 6, 10, 13, 15, 17, I indicators 10 activity 1 collision 1 hub status 9 link 1 link ok 7, 8, 10 port 8 power 1, 6 receive 1, 8
MRx20T(UTP)Ver6_Book Page 44 Thursday, April 3, 1997 5:18 PM Index O overview 1 P pins 10Base-T pin assignments 28 ports AUI 15 AUI network 7 backbone 15 backbone network 1, 4 network backbone 13 RJ45 6 RJ45 network 1 uplink 1, 6 product description 1 S signal quality error (SQE) 6 site requirements 5 specifications 10Base-T Network 15 certification 28 connector ports 27 diagnostic LEDs 28 44 electrical 27 environmental 27 physical 27 surface mount technology (SMT) 3 switches MDI/MDI-X 22 T technical su
