This Recommendation applies to testing of Automatic Level Control (ALC) devices intended for use in digital network-based equipment. It does not apply to subscriber-based level control devices, devices that operate in the analogue domain, or any means of fixed level control within the network which may be part of an overall network transmission plan.
The scope of this Recommendation is to define certain performance constraints for network ALC devices and, where appropriate, to define laboratory tests that may be performed on an ALC device to verify that these constraints are met.
An ALC device that satisfies all the constraints and passes all of the tests in this Recommendation should ensure (but will not guarantee) that the pre-existing standard of overall network performance (e.g. the transmission of speech, voiceband data and other voiceband signals, ISDN, etc.) is not degraded when the ALC device is installed in the network.
This Recommendation also describes the general characteristics of ALC devices and indicates what
characteristics are important to provide acceptable performance in the network. Issues relating to the
interaction of ALC devices with other network and subscriber equipment are also discussed in this
Recommendation.
This Recommendation does not define a standard algorithm.
This Recommendation does not define planning rules, deployment aspects, or target levels for ALC devices.
本建议适用于测试打算在基于数字网络的设备中使用的自动电平控制(ALC)器件。本建议不适用于基于电平控制器件、工作于模拟领域的器件以及任何可能作为全网传输规划组成部分的网络内的固定电平控制设施。
本建议的范围是规定网络中的ALC器件的某些性能限制条件，并适当地定义可在ALC器件上进行的验证其是否符合这些限制条件的实验性测试。
满足本建议中的全部限制条件并全部通过测试的ALC保证（但不是担保）当把ALC器件安装在网络中时，网络总性能的原有标准（例如话音、话音频带数据及其它话音频信号、ISDN等传输性能）不致劣化。
本建议还描述ALC器件的一般特性，并指出这些特性对于在网络中提供可接受的性能是很重要的。关于ALC器件与网络和用户设备之间的相互作用问题，也在本建议中讨论。
本建议不规定标准算法。
本建议不规定ALC器件的设计规则、布局或触发电平。
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发表于 2008-10-24 11:45:23
