Network Negotiation

What does negotiation mean when discussing network protocols?

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Negotiation has to do with getting both sides to agree on some parameters or values to be used during the communication. Maximum packet size is one example, but there are many others.

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vijaykwt

  • Apr 20th, 2010
 

The Difference Between Half and Full Duplex.

"Duplex" simply means you're able to send and receive data (most often the human voice) from the same device whether that be with your phone, 2-way radio, or PC.

Half-duplex devices let you send and receive, but only one-way at a time. If you've ever used a walkie-talkie, then you know what half-duplex conversations sound like. You have to push the TALK button to send your message. But as long as you are holding the TALK key, you can't hear what anyone else is saying. You must release the button to receive.

Full duplex actually, full duplex is nothing new. In fact, you already know exactly what it sounds like. Your corded or cordless phones are full-duplex devices letting you and your caller speak simultaneously without any dropouts in either one of your voices.

Half- and Full-Duplex Mode

Each switch port can operate in either half-duplex or full-duplex mode.
Half Duplex = send or receive data
Full Duplex = send and receive data

Autonegotiation

The switch supports the autonegotiation of both speed and duplex mode. As a result, when the switch is connected to another network device that is capable of autonegotiation, the two devices communicate common speeds and duplex modes to each other. Then, the highest common capabilities for both devices become the operating modes.

The switch has the following operating priorities:

1. 100 Mbps, full-duplex mode
2. 100 Mbps, half-duplex mode
3. 10 Mbps, full-duplex mode
4. 10 Mbps, half-duplex mode

Note: Hub operates in Half Duplex Mode, whereas the switch operates in both Half and Full Duplex Mode.

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