单身公寓--№58房
桃乐丝联盟死党之
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- 2003-02-27
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请准确无误地翻译一下，我知道这是你们的专长，我的翻译人家说中英两不像，急!!!谢谢
Shared communication channels
The history of computer networking changed dramatically during the late1960s and early 1970s(LANs).Devised as alternatives to expensive,dedicated point-to-point connections,the designs differ fundamentally from long-distance networks because they rely on sharing the network.Each LAN consists of a single shared medium,usually a cable,to which many computers attach.The computers take turns using the medium to send packets.
Several LAN designs emerged from the research.The designs differ in details such as the voltages and modulation techniques used,and the approach to sharing(i.e the mechanisms used to coordinate access and transmit packets).
Because it eliminates duplication,sharing has an important economic impact on networking:it reduces cost.Consequently,Local Area Network technologies that allow a set of computers to share a medium have become popular.
If sharing reduces cost,why are shared networks used only for local communication?Both technical and economic reasons contribute to the answer.We said that the computer attached to a shared network must coordinate use of the network.Because coordination requires communication and the time required to communicate depends on distance,large geographic separation between computers introduces longer delays.Thus,shared networks with long delays are inefficient because they spend more time coordinating use of the shared medium and less time sending data.In addition,engineers have learned that providing a high bandwidth communication channel over long distances is significantly more expensive than providing the same bandwidth communication over a short distance.
[F]报酬：3000刀。 [/F]
Shared communication channels
The history of computer networking changed dramatically during the late1960s and early 1970s(LANs).Devised as alternatives to expensive,dedicated point-to-point connections,the designs differ fundamentally from long-distance networks because they rely on sharing the network.Each LAN consists of a single shared medium,usually a cable,to which many computers attach.The computers take turns using the medium to send packets.
Several LAN designs emerged from the research.The designs differ in details such as the voltages and modulation techniques used,and the approach to sharing(i.e the mechanisms used to coordinate access and transmit packets).
Because it eliminates duplication,sharing has an important economic impact on networking:it reduces cost.Consequently,Local Area Network technologies that allow a set of computers to share a medium have become popular.
If sharing reduces cost,why are shared networks used only for local communication?Both technical and economic reasons contribute to the answer.We said that the computer attached to a shared network must coordinate use of the network.Because coordination requires communication and the time required to communicate depends on distance,large geographic separation between computers introduces longer delays.Thus,shared networks with long delays are inefficient because they spend more time coordinating use of the shared medium and less time sending data.In addition,engineers have learned that providing a high bandwidth communication channel over long distances is significantly more expensive than providing the same bandwidth communication over a short distance.
[F]报酬：3000刀。 [/F]
不过我需要得是最精确的翻译，因为是要交上去的，其实单词我都知道，只不过我组织不好我的词汇，中国人看不懂外国人更别说了......
发光要多少钱啊??~~~~
