眨眼
发表于 2025-3-25 05:38:38
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resuscitation
发表于 2025-3-25 07:50:52
Packet switched networks,mode of operation for speech conversation, where the circuit is used more or less continuously by one subscriber or the other. However, with data traffic, circuit-switching may represent a very inefficient use of the available transmission facilities. Data traffic is often bursty in nature, with lon
Arthritis
发表于 2025-3-25 12:34:34
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Insufficient
发表于 2025-3-25 15:59:00
Digital Local Access,the subscriber’s premises. The very large investment in local line plant means that it is not economically viable to replace all existing wire-pair circuits with cables designed specifically for digital transmission. Various techniques have therefore been proposed to enable the existing local lines
套索
发表于 2025-3-25 21:39:51
ISDN services and protocols,es, networks and interfaces. The standards need to be versatile and with as few variations as is practically possible. With this in mind, CCITT have established the ISDN series of recommendations known as the CCITT I series recommendations. The general structure of the I series recommendations is gi
scoliosis
发表于 2025-3-26 01:23:35
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ambivalence
发表于 2025-3-26 07:56:21
ATM,k technology. Frame Relay is a technique that has recently been standardized as a method which offers high transmission capacity utilization efficiency for the transmission of data over digital networks operating at high speed with low probability of error. It is ideally suited to the interconnectio
欢腾
发表于 2025-3-26 11:03:27
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SEVER
发表于 2025-3-26 15:45:03
https://doi.org/10.1007/978-94-011-1592-6ISDN; Modulation; Quality of Service; Quality of Service (QoS); Scrambler; Standards; Synchrone Digitale H
Euthyroid
发表于 2025-3-26 18:49:38
Introduction,The preamble to the CCITT I series recommendations succinctly defines an ISDN as follows: