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Unlike temporary dial-up connections, an SP2P does not need to be connected via dial-up before exchanging data or disconnected after use. The provider establishes the connection once, after which the customer is able to use the line on a permanent basis. Point-to-point connections used exclusively by carriers are also referred to as carrier point-to-point connections. ### Possible applications for standard point-to-point connections SP2Ps offer a number of options and can be used for a variety of applications. For example, computer centres can be interlinked via such connections. Branch offices are also often connected to headquarters via standard point-to-point connections. Another common application for standard point-to-point connections is networking telephone systems. A point-to-point connection allows for continuous use of internet services. Among other things, [cloud telephone services](/gb/en/products/cloudya) can be provided via this type of point-to-point connection. ### Typical SP2P media, speeds and interfaces Whilst in the early stages of the telecommunication age point-to-point connections were commonly established via permanent landline connections, the standard point-to-point connection is now based on a superordinate network hierarchy. SDH or ATM networks, for example, are used to establish the permanent connections virtually. Depending on the connection type and speed, customer connections are based on copper pairs, coaxial lines, or fibre optics. The data transmission rate ranges from 64 kilobits per second up to standard point-to-point connections of 155 megabits per second or higher. G.703 or X.21 are typical interfaces for the common 2 Mbit point-to-point connection. ### The difference between an SP2P and a DDL One key difference between a standard point-to-point connection and a [DDL](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/ddl) is commonly the slightly lower reliability. A DDL is typically actively monitored by the provider and in the event of a malfunction can be switched to an alternate route. But depending on the provider, an SP2P also offers high availability and a low error rate if based on intelligent, redundant network technology. 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