Organize and Share your Electronics the way you want. Sign-Up for a free account now. It takes only 30 seconds!

A Passive Ethernet Hub

A Passive Ethernet Hub

The network adapters are normal Intel and 3Com models, set to 10 Mbps and Half Duplex. The computers are labelled A, B, C, and the UTP cables from the computers to the hub are 10, 16 and 35 meters long, respectively.
While working half-duplex, each Ethernet adapter is continously monitoring its recieving pair of conductors (pins 3 and 6) for any traffic and will not start sending its data as long as anything else is being transferred through the medium. Even when already transmitting, the Ethernet adapter will fall silent as soon as any other traffic appears. This event is called ‘collision’ and is resolved by both computers waiting for pseudo-random periods of time before trying again.

So in this mode of operation the hub’s vital task is to enable each adapter to ‘hear’ everything others transmit, but at the same time to prevent each adapter from hearing itself sending data – and falsely detecting collisions.

The letter-number combinations in the schematic refer to connectors (computers) and pin numbers. For example, A1 means – pin 1 of the connector where the cable from computer A is connected, or simply – pin 1 of connector A. B6 means – pin 6 of connector B, etc.

Visit Here for more.







 

More Articles to Read

App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
App note: EPIC: Electro-Pyrotechnic Initiator Chip Resistor
App note: Noise analysis for high-speed op amps
App note: Noise analysis for high-speed op amps
Skill Sunday: Arrays
Skill Sunday: Arrays
App note: Infrared remote control implementation with MSP430FR4xx
App note: Infrared remote control implementation with MSP430FR4xx
Gesture Controlled Smart Home
Gesture Controlled Smart Home
Design for a Wideband, Differential Transimpedance DAC Output
Design for a Wideband, Differential Transimpedance DAC Output
Wrist thrusters let you fly through the water effortlessly
Wrist thrusters let you fly through the water effortlessly
Bertan/Spellman 225-20R HV power supply teardown
Bertan/Spellman 225-20R HV power supply teardown
Blinking Christmas Lights
Blinking Christmas Lights
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Adjusting clock with alarm, hygrometer & thermometer on 1.8″ ST7735 display
Adding an “extra sense” with rangefinders
Adding an “extra sense” with rangefinders
This wireless game controller looks like a rug
This wireless game controller looks like a rug
How to run your ESP8266 for years on a battery
How to run your ESP8266 for years on a battery
Calibration of a 3-Phase Energy Meter Board on the ADE7754
Calibration of a 3-Phase Energy Meter Board on the ADE7754
Making beats on a tiny Arduino DJ controller
Making beats on a tiny Arduino DJ controller
Qinsi-QS5100 Sn63Pb37 solder profile
Qinsi-QS5100 Sn63Pb37 solder profile
Water Detection System
Water Detection System
Professional Hi-Fi 15W Tube Amplifier circuit
Professional Hi-Fi 15W Tube Amplifier circuit
This Arduino machine will judge how sick your ollies are
This Arduino machine will judge how sick your ollies are
Turn an old payphone into a boombox for ’90s hits
Turn an old payphone into a boombox for ’90s hits

Top


Shares