SANS 201729-2005 公共交换电话网络(PSTN),2线模拟音频交换接口,定时打断再呼叫(登记再呼叫),终端的特殊要求
Public Switched Telephone Network (PSTN); 2-wire analogue voice band switched interfaces; Timed break recall (register recall); Specific requirements for terminals
Specifies the technical characteristics (electrical interface requirements) to be provided by Terminal Equipment (TE) to be connected to a 2-wire analogue interface of the PSTN or equivalent interfaces at which network register recall facility is intende