By Gilbert Held
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Extra resources for Data communications networking devices : operation, utilization and LAN and WAN Internet
In general, digital service gives data communications users improved performance and reliability when compared to analog service, owing to the nature of digital transmission and the design of digital networks. This improved performance and reliability is due to the fact that digital signals are regenerated whereas, when analog signals are ampli®ed, any distortion to the analog signal is also being ampli®ed. Although a digital service is offered in many locations, for those locations outside the serving area of a digital facility the user will have to employ analog devices as an extension in order to interface to the digital facility.
If the device has no data to transmit, it informs the computer of this fact and the computer continues its polling sequence until it encounters a device on the line that has data to send. Then the computer acts on that data transfer. As the computer polls each device, the other devices in the line must wait until they are polled before they can be serviced. 24 Poll and select line discipline. Poll and select is a line discipline which permits several devices to use a common line facility in an orderly manner selected device.
Channel Service Units manufactured for use on T1 lines are described in detail in Chapter 5. 544 Mbps services during the mid-1990s resulted in their availability for commercial usage. Until 1989 there was a signi®cant gap in the transmission rates obtainable on digital lines. 544 Mbps. Recognizing the requirements of many organizations for the transmission of data at rates above that obtainable on DDS but below the T1 rate, several communications carriers introduced fractional T1 digital service.