Off-line data transmission is simply the use of a telephone or similar link to transmit data without involving a computer system.

脱机数据传输是简单地利用电话或类似的链路来传输数据，不包括计算机系统。

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They are employed by telephone and other telecommunications transmission services establishments.

他们受雇于电话和其他电信传输服务场所。

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Poor telephone line quality can hamper transmission speed even further, and some older lines cannot handle 56K at all.

质量差的电话线还会进一步降低传输速度，有些较陈旧的线路根本不能处理56k。

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Their conclusion is that the switching and transmission costs for IP-based telephone networks are much lower than for switched circuit telephone networks.

CNN: IP telephony is the "in" thing these days, but should it be?