Bus/Ethernet

Date: 2015-10-07; view: 694.

Ring

Each device is attached to а network shaped as а continuous loop. Data proceeds in only one direction and at а constant speed round the loop. Devices may send information only when they are in control of the 'token'. The token is а package of data which indicates which device has control. The receiving device picks up the token, then clears it for another's use once it has received the message. Only one device may send data at any given moment, and each device must be working for the network to function.

А bus network consists of one piece of cable terminated at each end to which all devices are connected. In а bus-based network, each device is able to broadcast a message when it has detected silence for a fixed period of time. All devices receive the broadcast and determine from the content of the message whether it was intended for them. The only problem occurs when two devices try to send at the same time. When а sending device detects another's transmission, it aborts its own.

BThese are answers to questions about the texts. Write the questions.

1. To connect different devices on the network directly.

2. No, it goes in only one direction round the loop.

3. No, only one device may send data at any given moment.

4. From the content of the massage.

5. It cancels its own transmission

Exercise 5. The columns below describe characteristics of the bus and ring configurations. Which column refers to which configuration? How did you decide?