标准介绍：【PRTBR 038-1998 公共交换电话网（PSTN ） ，附件要求的终端产品中使用的模拟手机功能能够支持对齐案例服务当连接至模拟接口的PSTN在欧洲，】The TBR specifies the technical characteristics (electrical and acoustic requirements) under Article 4(g) of directive 91/263/EEC to be provided by a single, handset telephony, terminal equipment which is intended- (a) for pan-European approval; and (b) for connection by 2-wires to an analogue interface of a PSTN. This interface is characterised by a d.c.loop to indicate seizure and clearing, low frequency a.c ringing signals below the speech passband to indicate an incoming call and in the transmission phase has an approximate bandwidth of 3kHz at the network termination point; and (c) for supporting the voice telephony justified case service. Work item supported by Nortel, BT, Siemens, CSELT, BAKOM/OFCOM, GPT.
PRTBR 038-1998 公共交换电话网（PSTN ） ，附件要求的终端产品中使用的模拟手机功能能够支持对齐案例服务当连接至模拟接口的PSTN在欧洲，
