Telefonaktiebolaget Lm Ericsson (publ)

Ericsson Austria Ag

Schrack Telecom-aktiengesellschaft

Johann Pfeiffer

Manfred Listopad

The invention relates to a method for configuring a network termination unit for the packet-by-packet asynchronous transfer mode transmission of data. According to said method data subdivided into cells and assembled into packets are transmitted either at a constant data rate (CBR), for example in the case of voice or video data, or at a non-constant data rate (UBR). The data cells or packets are received and transmitted via the network termination unit, which constitutes an interface between a transmission line and data terminal. The number of data cells contained in each transmitted or received data packet is determined in the network unit () and from this number it is determined whether the ATM connection is carried out at a constant (CBR) or non-constant (UBR) data rate. The data packets of a CBR connection have processing priority over the data packets of a UBR connection.

Method for configuring a network termination unit

The invention relates to a filter arrangement for separating analog or digital baseband signals, for example, POTS or ISDN signals and digital wideband signals, which are simultaneously transmitted on a two-wire line of a message transmission system. In accordance with an exemplary embodiment of the invention, the filter arrangement has a bi-directional low-pass filter ( ) and a bi-directional high-pass filter ( ). The low-pass filter ( ) includes a first filter ( ) with a first passband. The first filter ( ) permits flow-through of direct current. A second filter ( ) with a second passband is preferably arranged assembled by connecting the inputs and outputs of the first and second filters ( ) in parallel.

Filter arrangement

The present invention relates to a method of using a modem for processing signals for signal transmission in the base band on a two-wire line. In order to reduce coupling to adjacent channels in the two-wire line, and to reduce effective line attenuation, it is proposed that the signal that is to be transmitted in a process of the above type be encoded such that each three transmit bits are combined to form a tri-bit, and one of eight discriminable sender levels for a main data channel are associated with each tri-bit, whereby the modulation rate of the symbols on the line is reduced to one-third of the bit rate.

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Vienna, Austria

Johann Pfeiffer