JPS61224697A - System for selecting and controlling communication line - Google Patents

Abstract

PURPOSE:To reduce circuit invalid holding due to the dissidence of circuit states because each exchange controls the state of the communication line by permitting a toll transit switch connected to a local switch to control the state of the communication line connecting communication exchanges and to function selective control. CONSTITUTION:The toll transmit switch TS-FX, which has received a connection request from the local switch LS station, indicates a circuit translator LNS to request a STOC outgoing circuit translation through the control of a central control unit CC0 so that it can select an outgoing circuit SOGTOi for transmitting a facsimile signal to a facsimile accumulation converter STOC. The LNS translates from FAX call connection request information to opposite STOC outgoing circuit information, inquires whether or not the outgoing circuit can be used or not to a circuit state controller LSM, which returns the response showing whether the circuit can be used or not to the LNS. The LSM controls the circuit states of all communication lines in the TS-FX at every line. The CC0 informs the STOC of the selected SOGTOi through a control signal transmitter CSEO and a control signal receiver CSE1, and simultaneously the communication line between the TS-FX and the STOC is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a selection control system for one communication line in a communication exchange for telephone communication, facsimile communication, etc.

A conventional selection control system of this type will be explained with reference to a relay system diagram in FIG. SUB O, l are telephones, LS is local exchange, 0CTO, 1, 2, 2n, 8, 8n are outgoing trunks,
ICTO, 1, 2, 2n, I, 8n are incoming trunks T
S is a toll exchange, CC0, 1 is a central control unit, L
NSo, 1 is a line translation device, and LSMo, 1 is a line status management device. L by dialing from 5UBO
The S station sends the dial number to the Ta2 station via 0GTO. At Ta2 station, LNS is operated under the control of CCO.
O [translates the received dial number, obtains outgoing line information for the opposing Ta2 station, determines whether the outgoing line can be used or not, and then selects and captures OG'l'2i. LSMO manages the line status, that is, whether the line is already in use or blocked due to a request from the maintainer of the own station, or whether the other station is blocked due to a request from the opposite TS station. Ru. The opposite TSg station also uses LNSI or L in the same way as above.
The outgoing line is selected by SM1. However, as is well known in each exchange, it is possible to block incoming trunks using type 2 ita control for testing purposes, etc., so the conventional selection control method described above is invalid due to a mismatch in the line availability status, with 0CT2 being in an empty state and ICT8 being in a blocked state. There was a disadvantage that a call was processed and the line was held invalid.

SUMMARY OF THE INVENTION In order to solve such drawbacks, an object of the present invention is to prevent the above-mentioned circuits from being held invalid by managing the idle state of the upper station accommodating/exiting circuits at the toll switching center connected to the LS station. It is an object of the present invention to provide a communication line selection control method that prevents the above.

The communication line selection control system of the present invention comprises a local exchange that accommodates facsimile terminals, a toll exchange connected to the local exchange, and a facsimile storage and conversion device connected to the toll exchange. In a communication network in which the toll relay exchange is operated, an empty state management means for an ingress/egress trunk accommodating the exchange and an ingress/egress trunk accommodating the factor storage/conversion device is provided in the toll relay exchange, and a selected line information transmitting/receiving means is provided between the toll relay exchange and the facsimile storage/conversion device. The outgoing line facing the local exchange and the facsimile storage/conversion device in the toll relay exchange is selectively connected based on the idle state management means, and the outgoing line selection in the factor-only storage/conversion device is performed by the line information transmitting/receiving means. The present invention is characterized in that connection control is performed based on selected line information received from a toll relay exchange.

Next, the present invention will be explained with reference to the drawings.

FIG. 2 is a relay system diagram showing an embodiment of the present invention. F
AXo, 1 is a facsimile terminal, LS is a local exchange,
0CT0.1 is the outgoing trunk.

ICTO, 1 is an incoming trunk, TS-FX is a toll exchange in factor communication, CC0, 1 is a central control unit, 5TOC is a facsimile storage and conversion unit, 5OGTO
,On,1. in is the outgoing trunk between TS-FX-8TOC, 8ICTO, On, l, In is TS-FX-8TO
The incoming trunk between C and 5IOT is TS-F'X-8TOC
LNS is a line translation device, LSM is a line status management device, C3I0.1 is a control signal transmitting/receiving device, and TYP is a typewriter.

Based on the call from the facsimile terminal FAXO, the LS station selects the communication line 0GTO between TS and FX, and
Make a connection request for a FAX call to. T that received the connection request
The S-FX selects the outgoing line 5OGTO1 for transmitting the facsimile signal to the 5TOC. Under the control of the CCO, it instructs the I and NS to request translation of the outgoing line to the 5TOC. L
The NS translates the FAX call connection request information into the 5TOC outgoing line information, and informs the LSM whether or not the outgoing line can be used.The SL8M returns a response to the LNS regarding the availability of the line that was queried by the 5LNB. do. Furthermore, L8M is T
Whether all communication lines within the S-FX are busy and in use, whether they are blocked due to typewriter control from a maintenance person, or whether the partner station received from 5TOC via C3EI-C8EO is managed according to the line. CCO selected 5OGTO
1 number to 5TOC via C3E0.1 and at the same time connect the communication line between TS-FX-8TOC, facsimile signals from FAXO can be sent to 5TOC.
Relay control to C. When receiving a facsimile signal from 5TOC to FAXI, CCI transmits T via C3EI.
Available pairs in TS-FX to CCO of S-FX 5
Sends a request to select the TOC line 8ICTOi and the incoming facsimile subscriber number FAXI. As in the case of selecting the 5TOC outgoing line, the CCO selects the 5TOC personal line 5ICTOi that can be used by the LNS and LSM, and selects the 5TOC accommodating outgoing line 5OGT1i corresponding to the line.
Obtain the information and set the 5OGTI i number as C3E0, 1
The 5TOC sent to the CCI of S'rOC via the 5OGT11 number received from TS-FX
Connect the communication line between S-FX-8TOC. Also T
S-FX selects the outgoing line to the corresponding LS station based on the incoming facsimile subscriber number received from 5TOC,
Makes an incoming connection request to the LS station. Upon reception of the incoming call preparation completion signal from the LS station, a request is made to the 5TOC to start transmitting a facsimile signal, and the facsimile signal is transmitted from the 5TOC to the facsimile terminal.

As explained above, according to the present invention, the state management and selection control function of the communication line connecting between communication exchanges is performed by the LS.
By managing the status of communication lines at each exchange, it is possible to reduce the number of invalid lines held due to line status discrepancies, which is done in the long-distance relay exchange connected to the central office. be.

[Brief explanation of the drawing]

FIG. 1 is a relay system diagram showing an example of a conventional communication line selection control system. FIG. 2 is a relay system diagram showing an embodiment of the present invention. FAXo, 1...Facsimile terminal, LS...
Local exchange, 0GTO, 1... outgoing trunk, ICTO
,1...Incoming trunk, TS-FX...Toll exchange in facsimile communication, CC0,1...Central control unit, 5TOC...Factor (9 storage conversion device. 5OGTO, On, 1.1n・=TS-FX-8TOC
Outgoing trunk between,,5ICTO,On,1. In-TS
- Incoming trunk between FX-8TOC, LNS...Line translation device. LSM...Line status management device, C3E0,1...
・Control signal transmitting/receiving device TYP between TS-FX-8TOC
0,1...Typewriter.

Claims (1)

[Claims] In a communication network including a local exchange accommodating facsimile terminals, a toll exchange connected to the local exchange, and a facsimile storage and conversion device connected to the toll exchange, the toll exchange A means for managing the empty status of the trunk for accommodating the exchange and an inlet/output trunk for storing the facsimile storage and conversion device is provided, and a means for transmitting and receiving selected line information between the toll switching exchange and the facsimile storage and conversion device;
The outgoing lines facing the local exchange and the facsimile storage/conversion device in the toll relay exchange are selectively connected based on the idle state management means, and the outgoing line selection in the facsimile storage/conversion device is performed by the line information transmitting/receiving means. A communication line selection control method characterized in that connection control is performed based on selected line information received from an exchange.