Port Ethernet Lan
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US $1.55
Ethernet Protocol Basics
During the 90s of last century many protocols existed in various networks and architectures. Engineers had developed diverse types of protocols; each for a specific data communication usage such as data transfer, voice, TV broadcast, data centers, and so on. Among which you can find Token Ring, FDDI, ATM and more.
However, due to the simplicity and to the low cost of Ethernet components, it has prevailed eventually, and is now the most widely used protocol in Local Area Networks (LAN). Faster Ethernet protocol were defined that can fit many of the above mentioned applications and network.
Actually Ethernet is a family of protocols, each of a different speed and all of them are based of packet transfer, as defined by the IEEE 802.3 standard group. Today there are Ethernet protocols and components that span from 10Mbit/sec (10 millions bits per second), to 100Mbit/sec (a.k.a. Fast Ethernet), 1Gbit/sec (1 billion bits per second), 10Gbit/sec, 40Gbit/sec and lately also 100Gbit/sec.
Ethernet is a physical layer protocol (layer1 and 2 of the 7 layers of the OSI model). It defines the way an Ethernet frame (packet) is transferred on the cable/fiber, and how the Ethernet switches along the way can direct the frame to its destination.
Ethernet can run on twisted pair copper cables and on fiber cables. The copper cables usually can transfer Ethernet packet up to 100 meters, and are used mainly in inner building networks. Fiber cables can reach tens of kilometers and are used to interconnect between far campuses and cities.
Being a physical layer protocol, Ethernet is a carrier of data for higher layer protocols such as IP (Internet protocol). Actually, most of the cases in which people discuss IP protocol, it is assumed they discuss Ethernet protocol as the carrier. The IP protocol enables to communicate between two logically separated networks. I.e. Ethernet enables direct communication within a logical network, called VLAN (Virtual Lan), while you must use IP protocol to perform proper routing of Ethernet packet between the VLANs.
Most of the electronics devices we use, such as personal computers and laptops, communicate by sending each other Ethernet packets. They are notated as Ethernet stations. Each such station has a unique address (a globally unique number comprises of 48 bits). This is called a MAC address. Each station has a network interface card (NIC) which is aware of this number and would not let an Ethernet packet with another MAC address to enter the station itself. Also, this MAC address is added to any packet transmitted from this NIC. Eventually, any packet carries the unique source address along its way.
The main component in an Ethernet network is the Ethernet switch (For clarity we discuss here Switched Ethernet, and ignore an older Shared Ethernet scheme, which is almost obsolete). A switch is connected to the stations either by a copper cable or a fiber cable, and can connect to various speed stations. Since all the stations, regardless of the speed itself use the same packet format, the switch enables all stations, regardless of their speed to interconnect.
As defined by the IEEE 802.3 group, the Ethernet switch is designed to detect the Ethernet packet origin (Ethernet Source Address) and the packet destination (Ethernet Destination Address). The destination and the source addresses are the first parameters in an Ethernet packet, and are read by the switch. A table of addresses within the switch constantly learns and keeps records of the addresses that are included in the packets entering the switch over the time, and organizes the address table such that each address is related to the port from which certain source address entered the switch. This table is served to direct each incoming packet to its relevant output port, so that the packet should reach its destination eventually.
The detection of the addresses, learning the addresses, and the decision where to switch the packet to, are all done by hardware means, as fast as possible. This is why Ethernet can reach 100Gbits/second.
The IEEE 802.3 definition of Ethernet includes, of course, some more notions such as Full-Duplex, Flow Control, Cut-Through, Store-and-Forward, MAC, Broadcast and Unicast packets, Auto-negotiation, Spanning Tree (STP), and more. We will discuss these topics in further articles.
More related information can be found at Communication Books, and Electronics Books.
About the Author
The author owns B.Sc. degree in Electrical Engineering, an M.Sc. degree in Interdisciplinary Engineering, and an MBA degree.
Main interests are: Online education, Books, Bikes, and Computers.
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OB LAN DEVICE 24 PORT GIG ETHERNET $1196.32 OB LAN DEVICE 24 PORT GIG ETHERNET |
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StarTech.com 5 Port 10/100 Desktop Ethernet Switch - 5 x 10/100Base-TX LAN DS5107 $19.01 StarTech.com 5 Port 10/100 Desktop Ethernet Switch - 5 x 10/100Base-TX LAN DS5107 |
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BROCADE 24 Port Gigabit Ethernet Interface Module - 24 x 10/100/1000Base-T LAN - Interface Module SXFI424C $2786.11 BROCADE 24 Port Gigabit Ethernet Interface Module - 24 x 10/100/1000Base-T LAN - Interface Module SXFI424C |
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Supermicro Low-Profile 2 Port 10-Gigabit Ethernet LAN Card $460.99 10GBase-CX4 10Gigabit Ethernet Card 2 2 x CX4 Windows Linux VMWare AOC-STG-i2 is a high-performance, dual-port 10Gb network controller optimized for multicore processor-based servers and virtualized environments. This adapter addresses the networking bottlenecks associated with server consolidation and is ideal for virtualization and demanding enterprise applications such as storage and high-performance computing. AOC-STG-I2 Low-Profile 2 Port 10-Gigabit Ethernet LAN Card Low-profile PCI Express x8 RoHS-6 Supermicro Supermicro Computer, Inc Yes www.supermicro.com |
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Supermicro Universal I/O 2 Port 10-Gigabit Ethernet LAN Card $346.99 10GBase-CX4 10Gigabit Ethernet Card 2 2 x CX4 Windows Linux VMWare AOC-UTG-i2 is a high-performance, dual-port 10Gb network controller optimized for multicore Intel Xeon processor-based servers and virtualized environments. This adapter addresses the networking bottlenecks associated with server consolidation and is ideal for virtualization and demanding enterprise applications such as storage and high-performance computing. AOC-UTG-I2 PCI Express x8 RoHS-6 Supermicro Supermicro Computer, Inc Universal I/O 2 Port 10-Gigabit Ethernet LAN Card Yes www.supermicro.com |
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LGEricsson USA ES1016G 16 Port Unmanaged Switch Gigabit Ethernet $242.79 Number of Ports: 16. Interfaces/Ports: 16 x RJ416 10/100/1000BaseT Network LAN. Ethernet Port: Yes. Fast Ethernet Port: Yes. Gigabit Ethernet Port: Yes. |
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Super micro Supermicro Universal I/O 2 Port 10-Gigabit Ethernet LAN Card - PCI Express x8 - 2 x CX4 - 10GBase-CX4 AOCUTGI2 $371.65 Super micro Supermicro Universal I/O 2 Port 10-Gigabit Ethernet LAN Card - PCI Express x8 - 2 x CX4 - 10GBase-CX4 AOCUTGI2 |
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ExpressCard/34 GigaBit Ethernet LAN Card $16.55 ExpressCard/34 GigaBit Ethernet LAN Card |
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GTMax Ethernet LAN Adapter for Nintendo Wii USB Port $14.99 Brand new non-OEM Instantly creates an Ethernet connection from any USB port for faster and more reliable internet connection Plug and Play. Easy installation. USB powered, no external power required. Connectors: 1 x RJ-45 jack Integrated single chip fast ethernet MAC controller Eliminate dropped or no signals from wireless networks. Accessory ONLY. Wii not included. Type: Link Cable Features: Connects Your Wii Console To The Broadband Connection. Instantly creates an broadbank Ethernet connection from the USB port (Need to have a broadband service form your Cable or Phone companies |
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100% new DB9 RS232 serial to TCP/IP ethernet lan port server module converter $58.95 RS232 to ethernet,serial to Ethernet ,ethernet to serial module,RS232 serial to TCP/IP ethernet server |
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24AWG 4PRS Power Sync RJ45 Ethernet Lan Network Cable 2M $7.89 SpecificationType: Ethernet Port: RJ-45/RJ11 Length (cm): 200 Weight (kg): 0.063 |
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Brocade 24 Port Gigabit Ethernet Expansion Module $2955.99 1 Gbps 1 Gbps Gigabit Ethernet 10 Mbps 10 Mbps Ethernet 10/100/1000Base-T 100 Mbps 100 Mbps Fast Ethernet 24 24 Port Gigabit Ethernet Expansion Module 24 x 10/100/1000Base-T LAN 24 x RJ-45 10/100/1000Base-T PoE LAN Foundry FastIron SuperX Chassis Brocade Brocade Communications Systems, Inc Data Networking Expansion Module SX-FI424P Twisted Pair 10/100/1000Base-T www.brocade.com |
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Brocade 24 Port Gigabit Ethernet Module $2451.99 1 Gbps 1 Gbps Gigabit Ethernet 10 Mbps 10 Mbps Ethernet 10/100/1000Base-T 100 Mbps 100 Mbps Fast Ethernet 24 24 Port Gigabit Ethernet Module 24 x 10/100/1000Base-T LAN 24 x RJ-45 10/100/1000Base-T PoE LAN Brocade FastIron SuperX Family Brocade Brocade Communications Systems, Inc Data Networking Expansion Module SX-FI624P Twisted Pair 10/100/1000Base-T www.brocade.com |
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Brocade 24 Port Gigabit Ethernet Interface Module $2586.99 1 Gbps 1 Gbps Gigabit Ethernet 10 Mbps 10 Mbps Ethernet 10/100/1000Base-T 100 Mbps 100 Mbps Fast Ethernet 24 24 Port Gigabit Ethernet Interface Module 24 x 10/100/1000Base-T LAN 24 x RJ-45 10/100/1000Base-T LAN Foundry FastIron SuperX Chassis Brocade Brocade Communications Systems, Inc Data Networking Interface Module SX-FI424C Twisted Pair 10/100/1000Base-T www.brocade.com |
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1700600L2 - Adtran Netvanta 3120 Fixed-Port Ethernet Router - 1 X 10/100Base-Tx Wan, 4 X 10/100Base-Tx Lan, 1 X $452.43 the Netvanta 3120 Is A Fixed-port Ethernet Router With An Integral Four-port Ethernet Switch. It Provides A Single Auto-sensing 10/100base-t Ethernet Network Interface, Four Auto-sensing 10/100base-t Ethernet Lan Interfaces, And An Analog Modem Interface For Dial-backup Or Remote Management. This Product Is Ideal For Enterprise Internet Access For Secure, High-speed Corporate Connectivity Using Broadband Access Such As Dsl Or Cable. [2404352] UPC: 607565022753 UNSPC: 43222609 10.2L x 15.4W x 4.2H 3.7 LB 1 Cubes |
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LGEricsson USA ES1105G IPECS Ethernet Switch 5 Port 5 x 10/100/1000BaseT $79.92 Number of Ports: 5. Interfaces/Ports: 5 x RJ45 10/100/1000BaseT Network LAN. Ethernet Port: Yes. Fast Ethernet Port: Yes. Gigabit Ethernet Port: Yes. |
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USB 10/100 Ethernet Network LAN Adapter RJ45 NIC $6.6 DESCRIPTION * Full speed USB interface to Desktop PC and Notebook * provided 10M/100M Ethernet port and connect to the internet or LAN * Auto sense the 10/100 Ethernet * Full and Half Duplex auto-negotiation for both 10BaseT and 100BaseT * USB 2.0 Compliant * Self Power, No external Power Required * Color may be varyRequirement * Available USB port * Microsoft Windows 98SE/ME/2000/XPPackage Contains * USB 10/100 Network Adapter * Driver CD |
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StarTech EOC110K Ethernet Over Coaxial Lan $433.36 If you need to extend your Ethernet connection over extremely long distances while still maintaining high speed network connectivity you will need to employ a Ethernet Extender. Startech has developed an Ethernet extender Kit that allows you to run the connection over existing coaxial cable with little to no modification required. The EOC110K Ethernet over Coax extender kit includes both end points and allows you to span a 10/100 network over extremely long distances (up to 8000ft) while still maintaining highspeed network connectivity. The EthernetCoax extender allows you to run the connection over existing coaxial cable with little to no modification required making it a perfect solution for a broad range of applications including connecting isolated user stations from the same or separate building or overcoming infrastructure obstacles and distances (e.g. older stone/concrete architecture) where new wiring or wireless connectivity may be impossible. The Coaxial Ethernet LAN Extender kit helps to eliminate expense by allowing video streaming and data to share the same coax cable without interference and also offers the ability to use multiple EOC110R receiver units (sold separately) to create a pointtopoint or pointtomultipoint topology for enhanced network scalability. Plug and Play design for simple installation; no configuration or software required. Uses existing coaxial cable RG59 RG6 RG7 or RG11. Supports point to point and point to multipoint topologies. Supports up to 32 nodes. Transparent TCP/IP Operations. AutoMDIX and Autonegotiation 10BaseT or 100BaseTX and Full or HalfDuplex on the Ethernet port. Compliant with EoCNA standard. Status LEDs for simple monitoring of the device and connection status. Extend an Ethernet network across an existing closed circuit camera network (over coax) without interrupting the analog TV signal. Provide highspeed connectivity to a user or network segment that is in an isolated area of a large complex or i |
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Supermicro Universal I/O 4-Port Gigabit Ethernet LAN Card $202.99 10/100/1000Base-T 4 4 x RJ-45 AOC-UG-i4 is a high performance 4-port Supermicro Universal I/O (UIO) Gigabit Ethernet LAN card based on Intel's 82571 chips. It interfaces with Supermicro UIO motherboard through a PCI Express UIO slot to maximize the I/O bandwidth of the multiple ports Gigabit Ethernet connectivity. The dedicated input/output connections of the PCI-e ensure priority performance on each port without bus-sharing. The AOC-UG-i4 improves performance especially in multi-processor systems by balancing network loads across multiple CPU and processing cores. AOC-UG-I4 Category 5e Gigabit Ethernet Card Internal PCI Express x8 Supermicro Supermicro Computer, Inc Universal I/O 4-Port Gigabit Ethernet LAN Card www.supermicro.com |
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CNet CSH-500 Ethernet Switch - 5 Port $21.99 0.98" Height x 4.64" Width x 2.75" Depth 10/100Base-TX 100 V AC to 240 V AC 110 V AC 149 Kpps 2 220 V AC 5 5 x RJ-45 10/100Base-TX Network LAN CNet's CSH-500 is a powerful Five (5) ports Fast Ethernet Switch. Every port is equipped with a built-In Auto-Negotiation function. Simply attach a network device to any port and the port will automatically set to operate at the fastest possible speed. This Switch is designed to provide lots of bandwidth with minimum hassle. They are 100% Plug-&-Play and require no settings configuration. These models fully comply with IEEE 802.3u and IEEE 802.3 standards for Fast Ethernet and Ethernet operation. CNet CNet Technology, Inc CSH-500 CSH-500 Ethernet Switch CSH-500 VER. M Ethernet Switch Power Supply Yes www.cnetusa.com |
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AXIS Power Over LAN Midspan -1 port $72.99 Specifications: Function: Deploying Power over LAN in conjunction with a central UPS distributes back-up power and ensures uninterrupted operation of network surveillance cameras during electrical power failures. Data rate: 10/100 Mbps Connectors: 1 shielded RJ-45 Data connector and 1 shielded RJ-45 output connector for the combined data and power, TIA/EIA 568 Category 5 Scalability: Multiple Midspans can be mounted in a wiring cabinet to support additional terminals, resulting in a simple, cost effective method for expanding the network, as requirements evolve Remote power feeding: Powers network video products up to 100m (328 ft) by utilizing existing Ethernet or fast Ethernet (category 5 unshielded or shielded twisted-pair cabling) for power transfer Pin assignment and polarity: 4/5 (RTN.), 7/8 (-V) Output power voltage: -48 V User port power: 15.4 W minimum Agg... |
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H3C Router 3030 one Adsl Over Pots Port DSL Modem LAN (EN 4-Ports 10/ 100Mbps) WAN (DSL 1-Port) Fast Ethernet 0231A055 $150 H3C Router 3030 one Adsl Over Pots Port DSL Modem LAN (EN 4-Ports 10/ 100Mbps) WAN (DSL 1-Port) Fast Ethernet 0231A055 |
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PC 10/100Mbps PCI Ethernet Network PCI LAN Adaptor Card $16.49 Features:This Ethernet Network Card connects to your networked computer with a network RJ45 port.Plug & play installation, and you'll achieve high-speed transfer of all kinds of data.Special single chip design improves the reliability of your network card performance.Specification parameter:Card type: Ethernet card O/S Compatibility: support Microsoft Windows 95/98/ME/2000/XP, Microsoft NT, RedHat Linux and Unix OSTransfer rate of the 10/100Mbps PCI LAN Card: 10/100 MbpsSupports Full Duplex Flow Control ( IEEE802.3x ).Bus interface of the PCI LAN Card: PCICommunication mode: full duplexNetwork port type: RJ45Compatible cable type: cat 3/4/5 UTPThe PCI Ethernet LAN Adapter is compatible network standard: IEEE 802.3, 802.3uLED indicator: 2 LED ( indicating network Link / Activity / Speed / Duplex ).Size: 12cm long ( at the longest ), 11.7cm wide ( at the widest ), 1.8cm thick ( at the thickest ). Approx.Weight: 96g. Package Contents:1 x 10/100Mbps PCI LAN Card1 x User Manual |
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Netgear ProSafe GS116E Ethernet Switch - 16 Port $182.99 1.06" Height x 4.06" Width x 11.30" Depth 1.5 Mpps 1000Base-T 12 V DC 16 16 x RJ-45 1000Base-T Network LAN 2 2 lb The eight-port desktop GS108E, the 16-port desktop GS116E and the rack-mounted 24-port JGS524E all offer Gigabit Ethernet, ten times the speed of Fast Ethernet. The eight-port desktop GS108PE is the first in the ProSafe Plus Switch family to provide Power-over-Ethernet (PoE) for supporting devices such as IP phones, wireless access points, security cameras and remote switches without the need for separate electric lines. AC Adapter Desktop Ethernet Switch GS116E GS116E-100NAS Netgear Netgear, Inc No Not Applicable ProSafe ProSafe Plus GS116E Ethernet Switch RoHS WEEE Wall-mountable Yes www.netgear.com |
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Zonet ZFS3316P Ethernet Switch - 16 Port $49.99 1.38" Height x 5.31" Width x 9.76" Depth 10/100Base-TX 16 16 x RJ-45 10/100Base-TX Network LAN 2 9 V DC ZFS3316P Ethernet Switch 1 x Quick Installation Guide 1 x Power Adapter The Zonet ZFS3316P - 16-Port 10/100Mbps Switch offers a simple solution for instantly expanding your network. This auto-switching Ethernet connection makes it easy to link up to 16 PCs or Ethernet devices to your network. Each port independently negotiates for best speed and half- or full-duplex mode. This newly designed Zonet Ethernet Switch is sure fit into your workgroup environment. AC Adapter Ethernet Switch Yes ZFS3316P ZFS3316P Ethernet Switch Zonet Zonet USA Corporation www.zonetusa.com |
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Fs116Pna - Netgear Prosafe Fs116P Ethernet Switch - 16 X 10/100Base-Tx Lan $212.99 Netgear's Fs116p Fast Ethernet Switch With 8 Port Poe Provides Your Lan With High-speed, 10/100 Mbps Auto-sensing Connectivity For As Many As 16 Users. Just Plug In Your Ethernet Cables, Connect A Power Cord, And You're Ready To Go There's No Software To Configure. Engineered Without The Need For Internal Fans, They Operate Silently. And Each Of These Very Compact Switches Is Housed In A Sturdy Metal Case For Years Of Dependable Use. [1060097] UPC: 606449041712 UNSPC: 43222612 13.6L x 6.4W x 4.2H 3.85 LB 0.19 Cubes |
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24AWG 4PRS Power Sync Cat 6 RJ-45 Ethernet LAN Network Cable 7m $15.39 SpecificationType: Ethernet Port: RJ-45/RJ11 Length (cm): 700 Weight (kg): 0.212 |
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CP TECH FSW-0513 Ethernet Switch - 4 Port $138.99 1 x RJ-45 10/100Base-TX Network Uplink 1.10" Height x 3.54" Width x 4.72" Depth 10/100Base-TX 149 Kpps 2 2.65 lb 4 4 x RJ-45 10/100Base-TX PoE LAN 48 V DC Level One FSW-0513 Fast Ethernet Switch Power Adapter Power Cord User Manual FSW-0513 is a 10/100 Mbps Fast Ethernet Switch with 4 High-Power Power over Ethernet ports and one uplink port. With a total power budget of 120W, FSW-0513 is excellent for deploying network devices that require high-power such as outdoor security dome cameras and access points. And with highpower PoE, the reach of devices can be extended hundreds of meters. CP TECH CP Technologies Ethernet Switch FSW-0513 Level One FSW-0513 Fast Ethernet Switch Power Supply Rack-mountable Yes www.cptechusa.com |