配置在电缆两端的模块通过幻象电路配置内的两对导线为一个靠近数据设备的电话机与一个PBX之间的电话信号提供一个幻象通路。

Modules at each end of the cable provide a phantom path for telephony signals between a telephone near the data set and a PBX, through both conductor pairs in a phantom circuit arrangement.

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光缆对电子噪音不敏感，所以比通常的电话线和电缆有较低的误差率。

Fiber optic cables are not susceptible to electronic noise and so have much lower error rates than normal telephone wire and cable.

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