Nokia Telecommunications Oy

Nokia Technology Gmbh

Nokia Multimedia Network Terminals Ltd.

Juha Pihlaja

Harald Kaaja

Heikki Kokkinen

Petri Havanto

Olavi Mertanen

Kim Molin

A method for allocating control time slots to terminals in a multipoint system based on time-division data transmission. Specific grant numbers are allocated to the terminals in downstream time slots. One grant number is associated with a grant to send information, such as one ATM cell, in corresponding upstream time slots. The terminal may be forbidden by means of a grant number to send in a certain time slot, or the time slot may be called a slotted Aloha time slot or a measurement time slot used for timing advance adjustment. The network terminal sends grant numbers at a predetermined rate to each terminal or sends grant numbers on the basis of how much information the terminals report needs to be sent. ATM channels are accessed rapidly and allocated efficiently, and a short access delay for a speech channel is achieved.

Upstream access method in bidirectional telecommunication system

In a digital cable television system or a Hybrid-Fiber-Cable (HFC) system at least two control channels (,) of the out-of-band type are arranged to control the same upstream data transmission channel (,), whereby their capacity can be combined in order realize downstream data transmission in parallel with downstream high capacity data transmission. Applied in the DAVIC system the overhead bits (,) of the SL-ESF frames (,) of the co-ordinated control channels, and the R-bytes (R1,to R8,) of the SL-ESF payload indicating to which channel the control is directed, are made identical.

Bi-directional telecommunication link in a cable television system

A method of manipulating the header field in an ATM cell. In accordance with the method, the ATM cell is transferred via an interface where each byte of the cell appears in a parallel form on a plurality of parallel data conductors and where information on the start of cell (SOC) is also available. In order to be able to carry out header bit manipulation in a simple manner at such an interface, data conductors corresponding to the bits to be manipulated are led to a circuit carrying out the manipulation, and the other data conductors are led past the circuit. The bit to be manipulated is searched for by counting from start of cell up to the byte containing the bit to be manipulated, after which the bit is manipulated. An output conductor corresponding to the manipulated bit is led from the manipulation circuit to its own position among the data conductors that bypassed the circuit.

Manipulation of header field in ATM cell

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Espoo, Finland

Juha Pihlaja