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Allied Telesis CentreCOM AT-3004SL, Руководство пользователя

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Glossary

20

 

MANAGEMENT AGENT

 

—Software that is used to view hub activity and 

set hub variables.

 

MAU

 

—See Medium Attachment Unit

 

MAU to MAU, HUB to HUB WIRING

 

—10BASE-T MAU to MAU or hub 

to hub wiring generally requires a cross-over cable located somewhere along 
the UTP cable run. This may commonly occur at the punch-down block or 
between the RJ45 wall receptacle and the workstation. 

 

MAU/TRANSCEIVER

 

—An Ethernet transceiver is a MAU. A 10BASE-T 

MAU interfaces the UTP media to an AUI port on a workstation, repeater, 
bridge, or other Ethernet devices.

 

MDI

 

—See Medium Dependent Interface

 

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 the trunk cable medium and the MAU.

 

N-SERIES

 

—A barrel shaped, threaded connector used on 10BASE5 (thick 

Ethernet) coaxial cable.

 

PATCH PANEL

 

—A 10BASE-T patch panel may be between a punch-down 

block and UTP workstation. The patch panel generally has a female RJ45 
connector on the front for each workstation and a Telco (RJ21) connector on 
the back, which are wired to a punch-down block. This provides a convenient 
way for the installer or network manager to connect the hub 10BASE-T ports 
into the desired building locations.

 

PHYSICAL MEDIUM ATTACHMENT (PMA)

 

—The portion of the MAU 

that contains the functional circuitry.

 

PHYSICAL SIGNALING (PLS)

 

—That portion of the physical layer 

contained within the DTE that provides the logical and functional coupling 
between MAU and data link layers.

 

POLARITY CORRECTION

 

—Many 10BASE-T UTP ports have a Polarity 

Correction function. If the UTP wiring has RD- and RD+ inadvertently 
crossed, the polarity correction function will sample the signal and electrically 
swap the wires. If the TD- and TD+ wires are crossed, the correction would 
occur at the MAU on the other end of the UTP link. This occurs within a 
single pair and should not be confused with the cross-over cable.

 

PROPAGATION DELAY

 

—The time it takes a signal to travel from the 

input of a system component to the output. Usually measured in nanoseconds. 
IEEE 802.3 has specific propagation delay maximums for computing 
propagation budgets when designing a LAN. Cable length plays a major role 
in propagation delay. [i.e, a 50 meters (164 ft.) AUI cable has a maximum 
allowable propagation delay of 257 ns.] The propagation delay of cable is 
dependent on length and velocity factor of the cable type. There are also 
propagation delays associated with electronics attached to the system.

Содержание CentreCOM AT-3004SL

Страница 1: ...Allied Telesyn International CentreCOM AT 3004SL AT 3008SL Multiport Repeaters User Manual...

Страница 2: ...ding but not limited to lost profits arising out of or related to this manual or the information contained herein even if Allied Telesyn International Corp has been advised of known or should have kno...

Страница 3: ...8 Port with One AUI 1 Features 2 Chapter 2 Installation 3 Connections 3 Power 3 AUI Port 3 BNC Ports 4 Ventilation 4 Chapter 3 Operation 5 Status Indicators 5 Segmentation Partitioning 6 System Check...

Страница 4: ...Table of Contents iv Appendix B Glossary 17 Appendix C CentreCOM AT 3004SL AT 3008SL Manual Feedback 25 Appendix D Technical Support Fax Order 27 Incident Summary 27...

Страница 5: ...R cordage molded IEC 320 connector on one end and on the other end a plug approved by the country of end use MOUNTING INSTRUCTIONS These models are designed for operation in the HORIZONTAL position VE...

Страница 6: ...ons bninger m ikke blokeres og skal have fri adgang til den omgivende luft i rummet for afk ling ADVARSEL UNDLAD at fjerne gummisoklerne fra apparatet med mindre der anvendes et Allied Telesis vertika...

Страница 7: ...ATTENTION Ne pas bloquer les fentes d a ration ce qui emp cherait l air ambiant de circuler librement pour le refroidissement ATTENTION NE PAS ter les pattes d attache en caoutchouc du produit moins d...

Страница 8: ...dotto concepito per una temperatura ambientale massima di 50 gradi centigradi TUTTI I PAESI installare il prodotto in conformit alle vigenti normative elettriche nazionali UTSTR LT ENERGI Dette kommer...

Страница 9: ...om as normas federais e locais para instala es el tricas ENERGIA RADIADA Este producto comercial ha sido probado y cumple con las normas requeridas en los EE UU para un dispositivo de Clase A Este pro...

Страница 10: ...TRUSTNING DENNA UTRUSTNING M STE VARA JORDAD N tkabeln m ste vara ansluten till ett ordentligt jordat uttag Ett felaktigt uttag kan g ra att n rliggande metalldelar uts tts f r h gsp nning Apparaten s...

Страница 11: ...C interfaces respectively and a single IEEE 802 3 AUI which provides easy attachment to the media The CentreCOM Multiport Repeaters provide packet regeneration which results in a higher performance ne...

Страница 12: ...LLISION ON LINE RECEIVE COLLISION ACTIVITY POWER 10 BASE2 PORTS 3004SL IEEE 802 3 10 BASE2 ETHERNET 4 PORT REPEATER CentreCOM 4 3 2 1 O F F O N TERMINATOR TERMINATOR TERMINATOR O F F O N O F F O N O F...

Страница 13: ...are made at the back panel The AT 3004SL and AT 3008SL repeaters have a universal power supply that will accept either 110 or 220 VAC at 50 60 Hz AUI Port An AUI port is provided for connection to an...

Страница 14: ...ach BNC port See Figure 5 If installing with BNC T connectors in the center of a segment then the ports internal termination must be disabled OFF The segments termination should then be placed at each...

Страница 15: ...ckets from the other ports are available at the port Conversely if extinguished then no receive traffic is present Collision Indicates SQE or a Collision A flickering LED will indicate Collisions Occa...

Страница 16: ...all remaining BNC ports could maintain their connectivity while being isolated from the backbone cable attached through the AUI port System Check To ensure proper operation 1 Set each port to Manual 2...

Страница 17: ...unctional then try another port to determine if the port or cable segment is at fault If the SQE COL LED is constantly illuminated 1 Check for a missing open or shorted terminator Excessive flickering...

Страница 18: ...TION M A N A U T O 2 SEGMENT PARTITION M A N A U T O 3 SEGMENT PARTITION M A N A U T O 4 SEGMENT PARTITION M A N A U T O AUI PORT ON LINE RECEIVE COLLISION ON LINE RECEIVE COLLISION ON LINE RECEIVE CO...

Страница 19: ...T O 4 SEGMENT PARTITION M A N A U T O 5 SEGMENT PARTITION M A N A U T O 6 SEGMENT PARTITION M A N A U T O 7 SEGMENT PARTITION M A N A U T O 8 SEGMENT PARTITION M A N A U T O AUI PORT ON LINE RECEIVE C...

Страница 20: ...d data transmission characteristics are radically different The identification problem is exaggerated by the fact that some suppliers have sold purportedly data quality cables manufactured with voice...

Страница 21: ...hub and a Media Access Unit MAU or NIC the cable is wired straight through That is an RJ45 receptacle at the hub would wire pin to pin to the RJ45 receptacle at the MAU as shown in Figure 9 above Cab...

Страница 22: ...es the need for making or obtaining a crossover cable as shown in Figure 11 The interface type that IEEE specifies as standard for an Ethernet switch such as the AT 4016TR is MDI X The straight throug...

Страница 23: ...ult in excessive common mode noise and an unacceptably high data error rate Model Connected to MDI MDI X AT 4016TR Hub X AT 4016TR RJ45 Transceiver X AT 4016TR NIC X 1 This table assumes a straight th...

Страница 24: ...ght through cable the transmit pins 1 and 2 are paired as are the receive pins 3 and 6 In a crossover cable Figure 11 pins 1 and 2 TD and TD are paired as are pins 3 and 6 RD and RD When pins 1 and 2...

Страница 25: ...ction This concentration of UTP ports is later broken out for connection to a punch down block inside a building s wiring closet 50 pin Telco connections provide a very clean uncluttered interface to...

Страница 26: ...er to indicate that multiple stations are contending for access to the transmission medium COMPATIBILITY INTERFACE The MDI coaxial cable interface and the AUI branch cable interface the two points at...

Страница 27: ...data rates In these circumstances it is recommended that the wiring is tested with a 10BASE T signal wire tester IMPEDANCE An electrical characteristic of a circuit dealing with the combination of th...

Страница 28: ...es a convenient way for the installer or network manager to connect the hub 10BASE T ports into the desired building locations PHYSICAL MEDIUM ATTACHMENT PMA The portion of the MAU that contains the f...

Страница 29: ...10BASE T standard for connecting UTP cabling They are inexpensive and easy to install onto UTP cable SIGNAL QUALITY ERROR SQE Also referred to as Collision or Collision Presence This occurs when two...

Страница 30: ...802 3 Quick Primer _______ Reading the LEDs ______ Cabling _______ Telnet Communication ______ Software Downloading _______ I found the following the most valuable ______________________________ ____...

Страница 31: ..._________ ____________________________________ ____________________________________ Conditions List the steps that led up to the problem ___________________________ ___________________________________...

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