多年以后，我审核手中的音频PCB走线时，准会想起师傅带我去听音室的那个遥远的夜晚。当时，听音室只有我们两个人，模拟人头伫立在对面万籁俱寂。耳朵靠近手机听筒，我第一次听到了来自遥远时光深处的TDMA噪声，“滋——滋——”。 什么是TDMA？ 在手机 ...
AT&T has begun to shut off TDMA networks in select cities, notifying TDMA and GAIT users in those markets that they must upgrade their handsets to GSM models. Trial shutdowns have begun with small ...
The DOCSIS 1.0 and 1.1 specifications define the physical-layer RF interfaces for data-over-cable systems. 1 With the success of DOCSIS-based broadband access to homes and businesses, the demand for ...
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