Method for operating a digital time division multiplex communication network
AssigneeSiemens Aktiengesellschaft
InventorAlfred Mattern
Life of this patent
Estimating the term…
Abstract
A digital time division multiplex communication network wherein the subscriber terminals are disposed in a fixed order on a TDM trunk going out from and ending in the terminal exchange is described. The data intended for the subscriber terminals are sent out by the terminal exchange together with an unmodulated carrier byte in the order of the connection of the subscriber terminals. After receiving the information intended therefor and after modulation of the carrier byte with the information to be supplied, the subscriber terminals are no longer capable of reception until the next pulse frame. The carrier bytes sent which are transmitted further and now modulated pass without hindrance through succeeding subscriber terminals.
Claims12
A method of operation for a digital communication network wherein subscriber terminals are connected in a predetermined order to at least one time division multiplex (TDM) trunk, said trunk having its ends connected to a central exchange, comprising the steps of:
- transmitting from said exchange on said TDM trunk communication data for predetermined ones of said subscriber terminals participating in a given call in the order of the connection of said predetermined subscriber terminals to said TDM trunk, all other subscriber terminals being blocked from receiving, but passing, said communication data,
- readying said participating subscriber terminals for receiving said communication data, while blocking subscriber terminals other than said participating subscriber terminals from receiving communication data,
- receiving in each said participating subscriber terminal, processing and transmitting further said communication data transmitted from said exchange, while blocking the others of said participating subscriber terminals from receiving a communication data transmitted from the aforementioned participating subscriber terminal and
- disabling said participating subscriber terminals from receiving further communication data transmitted from said exchange after performing said receiving, processing and transmitting step.
A method of operating a pulse code modulated, time division multiplex (PCM/TDM) communication network wherein subscriber terminals are connected in a predetermined order to at least one TDM trunk, said trunk having its ends connected to a central terminal exchange, comprising the steps of:
- transmitting from said exchange a call address in at least one predetermined time sequence position for establishing a connection and transmitting thereafter an unmodulated carrier byte,
- requesting a connection by at least one of said subscriber terminals, modulating said carrier byte in said requesting subscriber terminal and removing data corresponding to said requesting subscriber terminal, from said call address,
- transferring the modulated carrier byte and reduced call address in a direction on said TDM trunk toward said exchange,
- sending, thereafter, from said exchange a byte comprising a leading code word and unmodulated carrier bits during the time position corresponding to the relative location of said requesting subscriber terminal and during several sampling intervals and
- modulating in said requesting subscriber station said carrier bits with dial digits corresponding to a subscriber terminal to be called.
Dependencies are inferred from the claim text.