US 5,963,558 AGranted

Data transmission system and a terminal management method of the same

AssigneeNEC Corporation

InventorShigekazu Harada

Life of this patent

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Abstract

For enabling to obtain automatically a proper identifier of a remote terminal and to assign an identification number to the remote terminal in order to performing supple communication control of a data transmission system wherein upward communication is performed according to a TDMA system and downward communication is performed according to a TDM system making use of cells having fixed length; a local station of the system comprises: a command-cell generation timer (112) for generating a command-cell generation trigger periodically, a command-cell generating unit (113) for generating a command cell to be downward transmitted every time the command-cell generation trigger is supplied by writing an available identification number therein, a window generation timer (111) for enabling a window signal every time the command-cell generation trigger is supplied for inhibiting transmission of upward cells from the remote terminals whereto identification numbers are assigned, a control-data-cell generating/terminating unit (107) for detecting a newly installed remote terminal by receiving a control data cell during the window signal is enabled, wherein a proper identifier of the newly installed remote terminal is written, and a terminal management unit (109) for assigning the available identification number to the newly installed remote terminal.

Claims10

Dependent claims

A terminal management method of a data transmission system having a local station and remote terminals star-connected to the local station wherein upward communication from the remote terminals to the local station is performed according to a TDMA (Time Division Multiple Access) system and downward communication from the local station to the remote terminals is performed according to a TDM (Time Division Multiplex) system making use of cells having fixed length;

the terminal management method comprising:
downward transmitting a command cell periodically from the local station when there is an available identification number which is not assigned to any of the remote terminals star-connected to the local station, the available identification number being written in the command cell;
generating a window period after downward transmitting the command cell, transmission of upward cells from the remote terminals, whereto identification numbers are assigned, being inhibited in the window period;
receiving the command cell performed by a newly installed remote terminal which is not assigned with any identification number, and obtaining the available identification number written in the command cell;
upward transmitting a control data cell from the newly installed remote terminal in the window period, a proper identifier of the newly installed remote terminal being written in the control data cell together with the available identification number;
receiving the control data cell performed by the local station for obtaining the proper identifier of the newly installed remote terminal together with the available identification number;
and
assigning the available identification number to the newly installed remote terminal and registering the proper identifier of the newly installed remote terminal in connection with the available identification number.

5 more elements

A data transmission system having a local station and remote terminals star-connected to the local station wherein upward communication from the remote terminals to the local station is performed according to a TDMA system and downward communication from the local station to the remote terminals is performed according to a TDM system making use of cells having fixed length;

the local station comprising:
a command-cell generation timer for generating a command-cell generation trigger periodically when the command-cell generation timer is not controlled to stop time count;
a command-cell generating unit for generating a command cell to be downward transmitted every time the command-cell generation trigger is supplied from the command-cell generation timer, an available identification number being written in the command cell;
a window generation timer for enabling a window signal every time the command-cell generation trigger is supplied from the command-cell generation timer, transmission of upward cells from the remote terminals, whereto identification numbers are assigned, being inhibited during the window signal is enabled;
a control-data-cell generating/terminating unit for detecting a newly installed remote terminal by receiving a control data cell during the window signal is enabled, a proper identifier of the newly installed remote terminal being written in the control data cell received during the window signal is enabled together with the available identification number;
and
a terminal management unit for assigning the available identification number to the newly installed remote terminal, and registering the proper identifier of the newly installed remote terminal in connection with the available identification number.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/187,741Filed 9 Nov 1998
Priority: JP 9-32514712 Nov 1997
Granted: 5 Oct 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04Q 11/0478
Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral,…:…
H04L 2012/561
Topology: star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
H04L 2012/5625
Transfer mode dependent, e.g. ATM: operations, administration and maintenance [OAM]
H04L 2012/563
Admission control: signalling, e.g. protocols, reference model