ISDN is used on digital lines as well as on voice-grade lines.

整合服务数位网路在数位线路上被使用就如同在声音等级的线路上。

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Some people say the voice is their father’s or grandmother’s or the voice of their third-grade teacher.

一些人说这想法是他们父亲的，或是他们祖母的，或是他们三年级老师的。

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A data channel on which the information transmitted can take any value between the limits defined by the channel. Voice - grade channels are analog channels.

一种数据信道，其传输的信息可取该信道规定界限内的任何值。话音信道就是模拟信道。

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Point One leases virtually all its capacity, under contracts in which the price of a voice-grade link has plunged in the past 18 months from 5 cents a mile per month to below 2 cents.

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As a result, operators can more effectively ensure a carrier-grade quality of experience for end users of High Definition voice and video, Web conferencing, instant messaging and presence, and other broadband-intensive mobile applications that go beyond the reliability of Skype, Apple FaceTime and other services suited for consumers but inadequate for the rigors of enterprise use.

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