我要沮丧
发表于 2025-3-25 04:03:50
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Glucocorticoids
发表于 2025-3-25 10:35:39
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使害怕
发表于 2025-3-25 12:15:24
Asynchronous Transfer Mode (ATM),Asynchronous transfer mode (ATM) has been developed mainly by the telecommunications companies and is proposed as a standard for Broadband ISDN. It was independently developed by Bellcore, the research arm of AT&T in the USA, and several giant telecommunications companies in Europe. This has led to two possible future standards.
defuse
发表于 2025-3-25 17:16:08
Analysis of digital pulses,Information is transmitted as an energy from a source to a destination. This energy can take the form of light waves, radio waves or even sound waves. Any electronic signal can be analyzed either in the time domain or in the frequency domain. All electrical signals, no matter their shape, can be represented by a series of sine or cosine waves.
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发表于 2025-3-25 21:03:01
Transmission lines,Digital pulses are affected by transmission systems in the following ways:
睨视
发表于 2025-3-26 00:23:59
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Herbivorous
发表于 2025-3-26 04:23:23
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轿车
发表于 2025-3-26 10:41:41
LAN performance,ty with other equipment, long term availability of hardware and software, and its general reliability. A major concern is the behaviour of the network under heavy loads. The IEEE 802 committee sponsored Bell Labs to analyze the performance of token ring and CSMA/CD networks. Their general conclusions were:
BLINK
发表于 2025-3-26 14:39:43
High-level Data Link Control (HDLC),en 2 adjacent nodes connected by a data link. Final framing, flow control between nodes, and error detection and correction are added at this layer. In previous chapters the data link layer was discussed in a practical manner. In this chapter its functions will be discussed with reference to HDLC.
Tdd526
发表于 2025-3-26 19:19:17
Mary Gearey,Andrew Church,Neil Ravenscroftalogue telephone system the voltage level from the phone varies with the voice signal. Unwanted signals from external sources easily corrupt these signals. In a digital communication system a series of digital codes represents the analogue signal. These are then transmitted as 1’s and 0’s. Digital i