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十户会议电话功能是GTD—120程控交换机的重要功能之一。在GTD—120机中,十户会议电话电路增用了一块电路插件板。这块插件板的电路只对与会者的PCM码进行比较、选择和控制。它配合交换网络完成十户会议电话功能。插件板的
Ten conference call feature is one of the important features of GTD-120 program-controlled switches. In the GTD-120, ten circuit boards add a circuit board. The circuit of this board only compares attendees’ PCM codes to select and control. It completes the ten conference telephone functions with the exchange network. Plug-in board