Digital Subscriber System No. 1 (DSS1), which is also known as Euro-ISDN or E-DSS1 (European DSS1), is a digital singnalling protocol (D channel protocol) used for the ISDN. The interface is also called NET3 for BRI and NET5 for PRI lines. Can also be called CTR4.DSS1 is a pan- European standard developed by ETSI. In 1989, 26 network operators from 20 European countries decided to develop this standard to replace earlier national protocols (such as FTZ 1 TR 6 or VN3 ). DSS1 has been one of the keys to the success of the ISDN within European countries (as compared to, for example, the US).
Non-European countries using DSS1 include Australia, Brazil, India, Israel, New Zealand, Pakistan, PeruFor other uses, see Peru (disambiguation The Republic of Per ( Spanish: Per Quechua, Aymara: Piruw is a country in western South America, bordering with Ecuador and Colombia to the north, Brazil to the east, Bolivia to the east, south-east and south, Chil, SingaporeThe Republic of Singapore ( Chinese , pinyin: Xinjiapo Gonghegu Malay Republik Singapura Tamil , Cingkappur Kudiyarasu , is an island city-state in Southeast Asia, at latitude 1°17'35"N longitude 103°51'20"E, situated on the southern tip of Malay Peninsul, TaiwanFor the political entity commonly known as "Taiwan," see Republic of China. The island of Taiwan ( Traditional: , Simplified: , Pinyin: Taiwn, Wade-Giles: T'ai-wan, Taiwanese: Tai-oan) is located off the coast of China in the Pacific Ocean. It is also kno and the United Arab EmiratesThe United Arab Emirates is an oil-rich desert country situated in the south-east of the Arabian Peninsula in Southwest Asia, comprising seven emirates: Abu Dhabi, Ajman, Dubai, Fujairah, Ras al-Khaimah, Sharjah and Umm al-Qaiwain. Before 1971, they were.
