U _pN interface

The U _pN interface is an interface within a telephone system installation . As the U _p0 interface has the U _pN interface two ISDN - user channels with 64 kbit / s, and a control channel with 16 kbit / s. The directional separation takes place in half-duplex operation , also known as the ping-pong process . The higher bit rate required for this at the interface is 384 kbit / s. The data is transmitted using the synchronous multiplex method, time division multiplex with 38-bit pulse frames. The U _pN interface is used, for example, to connect DECT transmitters to ISDN equipment (with an S ₀ interface ) or telephone systems .

literature

• Dietrich Arbenz: From drum selector to optiset E - The history of wired telephones for the Siemens private branch exchange systems (1950–2000) , Herbert Utz Verlag, Munich 2009, ISBN 978-3-8316-0908-6 .
• Hartmut Ernst: Basic course in computer science . 3rd edition, Friedrich Vieweg & Sohn, Wiesbaden 2003, ISBN 978-3-528-25717-0 .