Hitachi Telecom Technologies, Ltd

Ikuo Aso

Sakae Watanabe

Kazumasa Azuma

Kaoru Suzuki

Isao Wada

A technology is disclosed to enable VP/VC on an ATM network to be backed up by using an ISDN line without presetting any detailed information regarding a backup VP/VC to be set on the ISDN line. An ATM switch Ais provided to establish the ISDN line connecting with an ATM multiplexer Awhen any failure occurs in an ATM transmission path contacting with the ATM multiplexer A. Negotiation is carried out with ATM multiplexer Aby using the established ISDN line so as to decide a channel characteristic of a backup VP/VC to be set on the ISDN line. Then, the ATM switch Aand the ATM multiplexer Acommunicate with each other by using the backup VP/VC having the decided channel characteristic on the ISDN line.

ATM device, subscriber system, communication system and backup method

A line switching system of a dynamic band variation unit () having a function of connecting a dynamic data terminal device (A) to an opposing data terminal device (B) through a number of trunk lines such as a dedicated line () or ISDN lines (), wherein the quantity of data to be sent out to a trunk line is varied after the quantity of data to be stored to the dynamic band variation unit is adjusted by varying the communication speed of the data transmitted from the dynamic data terminal unit, when varying the data communication quantity of the data terminal device by increasing or decreasing the number of trunk lines.

Line switching system and line switching unit of dynamic band variation unit

A multiplex communication system is provided with a plurality of multiplex communication equipment connected to each other through an exclusive line. The multiplex communication equipment have a plurality of a structure information for setting multiple bands. The multiple bands are changed over by changing-over the structure information on the basis of a previous-set schedule.

Multiple band change-over method for multiplex communication equipment

A maintenance and supervising system and method for a multiplex communication system having mutually connected multiple pieces of multiplex communication equipment. A call controller executes call control by common channel signaling. A multiplexer multiplexes multiple communication data, and a fixed connection allocation device allocates multiplexed data within a multiplex circuit fixedly. A dynamic connection allocation device allocates multiplexed data within the multiplex circuit dynamically, and a piece of connection form switching equipment is provided. A piece of terminal equipment for maintenance and supervising is connected to one of the pieces of multiplex communication equipment. A call connection message is transmitted via common channel signaling, and the piece of maintenance and supervising equipment and the piece of multiplex communication equipment to be maintained and supervised are connected by securing a dynamic connection band in a multiplex circuit at the time of maintenance and supervising. The dynamic connection band is used for normal communication when not in use for maintenance and supervising.

Maintenance and supervisory control method and system for multiplex

Multiplex communication equipment 1A used in a multiplex communication system, has a memory portion 12 memorizing the equipment number for the communication test. When there is an incoming call with reference to the same equipment number as one of the multiplex line 1A from the multiplex line 2A, the accommodation line portion 14a under setting a loop receives the incoming call and the communication test is done through a route for the communication test. When there is no accommodation line under setting the loop, the incoming call is rejected.

Multiplex communication equipment and communication test method thereof

A multiplex communication equipment which can switch circuits and which enables cost saving in circuit usage of a public network when the circuit is switched. Multiplex communication equipment 1 with circuit switching control, which is selectively connected to either an active circuit 5, having a large transmission line, or a spare circuit 6, having limited transmission line. A data terminal interface (I/F) 18 is connected to data terminal equipment 2, and a voice terminal I/F 17 is connected to voice terminal equipment 3. An active circuit I/F 13 is connected to circuit 5, and a spare circuit I/F 14 is connected to circuit 6. A multiplexing control section 16 multiplexes data and voice information, and a circuit switching section 15 switches circuits. A control section 11 controls the aforementioned sections, and a memory 12 stores multiplexed information of the active circuit and the spare circuit and circuit switching information, and keeps circuit speed slow by multiplexing minimum required information only at the spare circuit, thus saving the circuit usage charge.

Growing community of inventors

Koriyama, Japan

Ikuo Aso