JPH01105693A - System for controlling isdn remote station - Google Patents

Abstract

PURPOSE:To unitedly deal with a signal system between a remote station and a master station by providing a converting means to convert the line signal, etc., of an existing analog telephone subscriber to an ISDN digital subscriber line signal system with either of an existing analog telephone subscriber unit or the service trunk of a remote station device, etc. CONSTITUTION:The signals of analog telephone subscribers 106a and 106b are terminated by subscriber circuits 107a and 107b and after that, they are respectively connected to signal converting circuits 2a and 2b which are prepared in each subscriber circuit between these subscriber circuits 107a and 107b and a concentrating switch 108. These signal converting circuits 2a and 2b convert the respective types signals of the analog telephone subscribers 106a and 106b to the message of a D-channel protocol. This converted message is multiplexed by a processor 18 in the same way as the D-channel signal message of the ISDN digital subscriber and sent to a master station 113. Accordingly, with one remote station device, the both subscribers of the existing analog telephone subscriber and the ISDN digital subscriber can be received.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] In particular, the present invention relates to an ISDN remote station control system in which a system is constructed by extending a traffic concentration switch from a master station to a remote location.

[Conventional technology]

The main purpose of current telephone networks is telephone services, and analog exchanges such as A-type exchanges and cross-path exchanges are used in these telephone networks.

This analog exchange accommodates not only various existing analog telephone subscribers but also so-called non-telephone terminals such as data terminals and facsimile terminals.

Incidentally, the non-telephone terminals mentioned above can be accommodated in the conventional telephone network if they are relatively low-speed terminals, but high-speed terminals cannot be accommodated. In addition, there is also the problem of how to use databases on personal computers, which have recently become extremely popular, at high speed and economically.

Therefore, a comprehensive service digital network I SDN (I
integrated 5ervics Digital
Network) has been proposed. The International Telegraph and Telephone Consultative Committee (CCITT) enacted the Basic Access Act (2004) at the end of 1984 to standardize the exchange of information between terminals and exchanges using digital-to-analog converters.
CCITT Nijiries) was recommended.

This Nijiries is based on transmitting voice at 64Kb/s (called B channel), consolidating other data into 64Kb/s + (B channel), and transmitting control information at 1
6Kb/s (referred to as D channel), the information transmission speed of digital subscriber line is 144kb/5 (64+64+
16 Kb/s) (referred to as 2B+D method).

The basic configuration of the digital exchange used for the above ISDN is as follows:
The communication path system that performs exchange connections, the signal processing system that transmits and receives signals with subscribers and between stations with the opposite exchange, the control system that controls call connections and manages the exchange system, and the monitoring and testing of exchanges. It consists of maintenance and operation systems, etc., and has a very large-scale structure. This digital switch differs from the analog switch mentioned above, which exchanges 7SPG signals such as telephone voice as they are, in that it first converts the analog signal into a digital signal using the PCM method, and then converts it into a digital signal using electronic components such as LSI. The exchange is carried out in the form of digital signals through communication channels.

On the other hand, subscribers to ISDN digital exchanges are not necessarily located in a large number in a large area as in the case of large cities, but for example, there may be a relatively small number of subscribers concentrated in a certain area, or they may be spread out over a wide area. There are things to do.

In such a case, applying a large-scale digital exchange as described above would be wasteful and inefficient.

Therefore, a method has been adopted in which the concentrator stage communication path (traffic concentration switch) that constitutes the communication path system of the digital exchange at the master station is extended to a remote location, and this switching operation is controlled remotely from the master station. (referred to as ISDN remote station control method).

Here, a conventional remote station device used in the above-mentioned ISDN remote station control system will be explained based on FIGS. 9 and 10.

Note that FIG. 9 shows a remote station device 105 for analog subscribers, and FIG. 10 shows a remote station device 1 for digital subscribers.
20 is shown.

Referring to FIG. 9, remote station equipment 1 for analog subscribers
05 is analog telephone subscriber circuit 107a, 10'j
b.) Consists of a RAHIC concentrator switch 108, a remote office control device 109, a termination device 111, and the like.

Said subscriber circuit 107a.

107b is a circuit having a so-called known BOR3HCT function, and B here is a Battery Feed.
(Telephone current supply), 0 is 0ver Voltage P
protection (overvoltage protection), R is the old nging
(Call signal sending), S is 5upervision (
monitoring), C is Codec (code decoding), H is Hyb
rid (2-wire to 4-wire conversion), T is Testing.

Existing analog telephone subscribers 106a, 106b are terminated in subscriber circuits 107a, 107b, respectively. Various signals are concentrator switch 1080 semi-fixed path and termination device 1
multiplexed (PCM) with the audio signal via 11,
Further, the signal is transmitted via a terminal device 112 to a master office (DCO) 113 consisting of a digital exchange.

'On the other hand, as shown in FIG.
7a, 117b, remote control processor (CPU
) 118, ) RAHIC concentrator switch 108, termination device 111, and the like.

The signals are then terminated at subscriber circuits 117a and 117b via ISDN modules 116b such as digital telephones 114a and 114b and image terminals 115a and 115b. According to the D channel protocol, the layer 3 message contents of the D channel subscriber line signal (described in detail later) are multiplexed by the processor 118 and sent to the main office (DCO) via the PCM line termination equipment (DTI) 111 and 112.
113. Note that the processor 118 forms a B channel communication path to the concentrator switch 108 according to the contents of the message.

[Problem to be solved by the invention]

As described above, in the conventional ISDN remote station equipment, there is a remote station equipment for existing analog subscribers and ISDN modern analog subscribers (see Figure 9), and a remote station equipment for digital subscribers (see Figure 10). (see figure) was required. Therefore, from the point of view of constructing the entire ISDN system as economically as possible, there is a problem in that both existing analog and digital subscribers cannot share the remote station equipment.

[Means to solve the problem]

The ISDN remote station control system of the present invention is an ISDN remote station device that accommodates both existing analog telephone subscribers and ISDN subscribers, and is capable of transmitting line signals, address signals, audible signals, etc. of existing analog telephone subscribers to ISDN terminals. (D channel signal system) by one of the following: per existing analog telephone subscriber, per multiple existing analog subscribers, or as a service trunk of the remote station equipment, and converting signals between the remote station and the master station. This method handles the methods in a unified manner.

〔Example〕

Referring to FIG. 1, the first embodiment of the present invention has a master station 11.
3, and is provided with a remote station device 9 connected via a termination device 112 and a PCM line 4. The remote station equipment 9 is connected to existing analog telephone subscribers 108a, 10'6b.
and track 1a, respectively.

Analogue telephone subscriber circuit 107 terminated via 1b
a, 107b. This subscriber circuit 107a, 10
7b is a circuit having a so-called known BOR8HCT function. Further, the remote station device 9 is a digital telephone 11.
ISDN subscriber circuits 117a, 117b terminate via ISDN channels 3a, 3b such as 4a, 114b and image terminals 115a, 115b. The home device 11
6a and 118b have almost the same functions as layer 1 of the rear O8I model. Further, the subscriber circuit 11
7a and 117b have a function of terminating D and D channel subscriber line signals from the digital transmission circuit and the link layer control circuit.

Note that in order to perform communication correctly, it is necessary to establish a communication protocol (protocol) between the sending side and the receiving side, and to transfer information based on this protocol. For this purpose, the O8I model of the International Organization for Standardization (ISO) is famous as a system that defines and systematizes electrical signal levels, timing conditions, etc. The O3I model classifies protocols according to their functionality.
Although CCITT's digital subscriber line signals are classified into two layers, the parts corresponding to the physical layer (layer 1), data link layer (layer 2), and network (layer 3) are recommended.

The remote station device 9 further includes a traffic concentrator switch 10.
8, a terminal device 111, and a remote control processor (
CPU) 118.

The message contents of layer 3 (code signals of status display signals and selection control signals) are multiplexed by the remote control processor 118 and sent to the master station 113 via the termination devices 111 and 112 of the PCM line 4. Ru.

On the other hand, the communication path is connected to a master station 113 via a traffic concentration switch 108 and termination devices 111 and 112.

At this time, the interface with the master station 113 is connected by the primary group interface, and regarding layers 1 and 2, the CC
Treated as the primary interface of the ITT I series. Regarding layer 3, since the remote station device 9 is a subscriber line concentrator, it statistically multiplexes the D channels on the ISDN subscriber line and communicates in a layer 3 message format as shown in FIG.

The layer 3 message format will be explained with reference to FIG.

The information on the D channel on the ISDN 2B+D basic access subscriber line is converted into the master station message format shown in FIG. Service identifier of the D channel on the subscriber line (0 = signal, 18 = D channel packet, 63
= management entity) is sent to the layer 2 address field 41, and the terminal identifier TEI is sent to layer 3 2B.
To +D subscriber line D channel link number (CES) 44, F-field (layer 3) is layer 3 ISDN basic access subscriber line number 43.2B on +D subscriber line B 1/B ! , is converted to CH number 45.

Further, at the head of layer 3, a protocol identifier 42 for indicating this layer 3 protocol, a B channel number 46 on the first order group, etc. are assigned in the layer 3 message. In addition, individual information between the remote station device 9 and the master station 113 (
Message type 47 for configuration of line concentration switch, convergence of traffic information, service order to subscriber line)
and remote station device control information 48 are assigned.

The various signals of existing analog subscribers shown in Figure 1 are converted into a unified message format with the master station 113 shown in Figure 2. It becomes possible to connect to the station.

Returning to FIG. 1, the remote station device 9 will be further explained.

After the signals of analog telephone subscribers 106a and 106b are terminated in subscriber circuits 107a and 107b, a signal conversion circuit 2a is provided for each individual subscriber circuit between these subscriber circuits 107a and 107b and the concentrator switch 108. ,
2b, respectively. This signal conversion circuit 2a,
2b indicates various signals of analog telephone subscribers 106a and 106b (DC intermittent, OFF HOOK%ON HOO
K signal, dial pulse, multi-frequency signal (PB double signal, dial tone and ringback tone audible signal)
Convert to channel protocol message. This converted message is processed by processor 118 as ISD N
It is multiplexed in the same way as a digital subscriber's D channel signal message and sent to the master station 113.

Referring to FIG. 3, the signal conversion circuit 2 (2a).

2b) each includes a call origination/disconnection detection section 21, a ring set section 22 for transmitting and stopping ringing, a tone circuit 23 for transmitting an audible signal, a PB receiving section 24 for detecting a selection signal (FB/DTMF), and a remote controller. Processor 1 of station equipment 9
18, a processor 26 and a memory 27 for controlling the above-mentioned means and converting various signals of analog subscribers into D-channel signals of ISDN subscribers.

Next, the outgoing connection sequence operation of the signal conversion circuit 2 (2a, 2b) will be explained with reference to FIGS. 3, 4, and 5.

First, analog telephone subscriber off footer (OFFHOOK)
A DC loop is formed by the analog telephone subscriber circuit 107 (107a) for calling.

107b). Then, the signal conversion circuit 2 (2a
, 2b), the call origination/disconnection detection unit 21 performs call origination detection (
Step 701). In order to receive the PB double signal and DP double signal as an address signal, the PB receiving section 24 and the calling
Set the cutting detection section 21 (steps 702 and 703
). The call P signal is received by the processor 26 counting the number of calls/disconnects detected by the call/disconnect detector 21 . When the above processing is completed, the Bromo Su 26 reports SET UP to the processor 118 (Step 704), and enters a call response waiting state (Step 705).
. The processor 118 of the remote station device 9 sends a SET UP message (calling message in the D channel signaling system) to the master station 113.

Upon receiving the call reception message (SET UP ACK) in the D channel signaling system returned from the master station 113 (step 706), the tone circuit 23 sends a dial tone (DT) to the subscriber (step 706). 7
07). On the other hand, when the call origination/disconnection detection circuit 21 detects that the subscriber has gone on-hook in the call response waiting state (step 708), the FB reception unit 24 and the DP reception processing which were in the address signal reception waiting state are activated. Release #(
Steps 709, 710), return to the initial state.

Further, when receiving a release completion message from the master station device 113 (step 711), the -on circuit 23 sends a busy tone to the subscriber (step 712), and monitors the off footer of the subscriber (step 713).

When the subscriber's on-hook call origination/disconnection detection circuit 21 detects (step 714), the step 709.71
0 processing and return to the initial state.

Returning to step 707 with reference to FIG. 5B, the subscriber receiving the dial tone from the signal conversion device 2 sends out an address signal. When the signal conversion device 2 receives the address signal (step 721), the processor 118 sends the first digit as an INFO message of the D channel signaling system to the master station 113 (step 722), and also determines whether this digit is the first digit or not. It is determined whether or not the number is the first number (step 723), and if it is the first digit, transmission of the dial tone is stopped (step 724).

Thereafter, a plurality of numbers after the second number are sent out in the same manner.

Note that if the subscriber interrupts address signal transmission and goes on-hook (step 725), the PB receiving unit 24 and DP reception processing for receiving the address signal are released (step 726), and a disconnection process described later is performed. .

The processor 26 of the signal conversion device 2 receives the call setting acceptance signal from the processor 118 (step 731), releases the PB receiving section 34 for receiving the address signal and DP reception processing (step 732), and performs outgoing connection processing.

When the master station 113 finishes receiving a series of numbers, it calls (
ALERT) sends the message back to the remote station device 9. When the remote station device 9 receives the paging message (step 7
33), a ringback tone (RBT) is sent from the tone circuit 23 to the subscriber (step 734).

When the master station 113 detects a response from the called party, it sends a response message (CONN) to the remote station device 9. When the signal conversion device 2 receives the response message (step 735), it stops sending out the ringback tone (step 736), and transmits the message to the processor 11 via the processor 6.
8 to connect the traffic concentration switch 108, the communication path is connected, and the communication state is established.

When the conversation state formed as described above ends, the analog/4G telephone subscriber goes on-hook, and the DC loop that has been formed up to that point is cut off. When this disconnection is detected by the call origination/disconnection detection unit 21 (step 741), the processor 2
6 receives this and transmits a call release message, which is a disconnection message of the D channel message, from the processor 118 to the master station 1.
13 (step 742).

The master station 113 receives the call release request (DISC) and returns a release message (REL) to the remote station device 9 based on the disconnection procedure of the D channel protocol.

When the signal conversion device 2 of the remote station device 9 receives this release message (step 743), it sends a release completion (RELC) signal that is an acknowledgment signal for this release message.
OM) The message is sent to the master station device 113 (step 744).

This completes the outgoing connection sequence.

Next, the incoming connection sequence will be explained. ``When receiving the SET UP message sent from the calling station (
Step 751), the signal conversion device 2
2 and send ringing to the subscriber Step 7
52), and sends a paging message to the master station 113 (
Step 753) When the subscriber goes off-hook, the call origination/disconnection detection circuit 21 detects that it is a response.Step 7
54), the ringing set section 22 is stopped to stop sending out the ringing (step 755).

When the signal conversion device 2 sends a response message to the master station (
Step 756), and a response confirmation message is sent back (Step 757). The processing after the path connection is completed is the same as steps 741 to 744 described above, so the explanation will be omitted.

The above-mentioned existing analog telephone subscribers 106a, 1
This is the sequence for oeb. In contrast, ISDN
Digital subscribers 114a, 114b, 115a, 11
In the sequence 5b, if the signal conversion circuit in FIG. 4 is replaced with a digital subscriber circuit, the signal exchange between the remote station device and the master station will be exactly the same. Furthermore, the exchange of signals with the ISDN module subscriber circuit at this time follows the instructions of the CC engineering TT.

Referring to FIG. 6, in a second embodiment of the present invention, the signals of analog telephone subscribers 106a and 106b are terminated in analog telephone subscriber circuits 107a and 107b, respectively, and then the signals of analog telephone subscribers 106a and 106b are terminated in analog telephone subscriber circuits 107a and 107b.

107b and the line concentrator switch 108, the signal conversion circuit 2 is provided as a unit of a plurality of subscriber circuits. This signal conversion circuit 2 is used for various signals of analog telephone subscribers (DC intermittent, off-footer signal, on-footer signal, dial pulse, multi-frequency signal (PB double signal, dial tone, and audible sound signal of ringback tone)
into a D-channel protocol message. This converted message is multiplexed in the processor 118 according to the message format shown in FIG. 4, as in the case of ISDN.
It is sent to the master station 113.

Referring to FIG. 7, the signal conversion circuit 2 is basically a third
It has almost the same configuration requirements as the configuration shown in the figure. The difference from the configuration in FIG. 3 is that the call origination/disconnection detection section 21. A ring set section 22, a tone circuit 23, and an FB receiving section 24 are each connected to each subscriber circuit, dropper, or inserter.

Also, referring to FIG. 8, in the third embodiment of the present invention, the signals of analog telephone subscribers 106a and 106b are terminated in analog telephone subscriber circuits 107a and 107b, respectively, and then terminated in half of the traffic concentration switch 108. It is connected to the signal conversion circuit 2 as a service trunk via a fixed path. This signal conversion circuit 2 is connected to a multiplexer (M
UX) 20 to the corresponding means. Namely, there is a call origination/disconnection detection section 21 that detects intermittent DC current, an off-footer signal, an on-footer signal, and a dial pulse, and a ringtone generator that generates a ringback tone.

The tone circuit 23 generates an audible sound signal such as a dial tone, and a PB signal receiver 24. Other structural requirements and basic operations are the same as those in the first embodiment, so their explanations will be omitted.

〔Effect of the invention〕

As explained above, the ISDN remote station control system of the present invention is an ISDN remote station device that accommodates both existing analog telephone subscribers and ISDN digital subscribers, and is capable of controlling line signals and addresses of existing analog telephone subscribers. ISDN digital subscriber line signaling system (D
By providing a conversion means for converting to the existing analog channel signal system for each existing analog telephone subscriber, for each multiple existing analog subscribers, or as a service trunk of the remote station equipment, one remote station equipment can convert the existing analog This has the advantage of accommodating both telephone subscribers and ISDN digital subscribers.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention;
3 is a block diagram illustrating an embodiment of the signal conversion means applied to the first embodiment; FIG. The figure is a sequence diagram showing an example of signal conversion according to the present invention.
5A and 5B are state transition diagrams of the signal conversion means for converting various analog subscriber signals and ISDND channel messages, FIG. 6 is a block diagram showing a second embodiment of the present invention, and FIG. A block diagram showing an embodiment of the signal conversion means applied to the second embodiment, FIG. 8 is a block diagram showing the third embodiment of the present invention, and FIGS. 9 and 1O are conventional existing analog FIG. 10 is a system block diagram of a remote station device for a telephone subscriber and FIG. 10 is a system block diagram of a remote station device for a conventional ISDN digital subscriber. 9...Remote station device, 2 (2a, 2b)...
... Signal conversion circuit, 21 ... Call origination/disconnection detection section, 22 ... Ring set section, 23 ...
・Tone circuit, 24...PB receiving section, 25...
...Communication buffer circuit, 26...Processor, 27...Memory, 107a, 107b...
...Analog telephone subscriber circuit, 117a, 117
b...ISDN subscriber circuit, 108...
・Traffic concentration switch, 113... Master station,
118...3rd r! jJ 7th rs4 4th Figure 5A 5β times

Claims (1)

[Claims] 1. In an ISDN remote station device that accommodates both analog telephone subscribers and ISDN digital subscribers, at least the analog telephone subscriber's line signal, address signal,
A conversion means for converting an audible sound signal to an ISDN digital subscriber line signaling system is installed either for each analog telephone subscriber, for each plurality of subscribers, or on a service trunk, and the signaling system between the remote station equipment and the master station is An ISDN remote station control system characterized by unifying analog telephone subscribers and ISDN digital subscribers. 2. In a remote station device separated from the master station and connected via a PCM line, there is an analog telephone subscriber circuit for terminating analog telephone subscribers, and an I/O circuit for terminating digital terminals.
A traffic concentration switch to which the SDN subscriber circuit, the analog telephone subscriber circuit and the ISDN subscriber circuit are connected and concentrating traffic, and a traffic concentration switch installed between the analog telephone subscriber circuit and the traffic concentration switch, 1. An ISDN remote station control system, comprising signal conversion means for converting intermittent signals, off-hook/on-hook signals, dial pulses, multifrequency signals, and audible signals into messages of the D channel protocol. 3. The ISDN remote station control system according to claim 1, wherein a signal conversion means is provided for each analog telephone subscriber that accommodates the signal conversion means. 4. ISDN remote station control system according to claim 1, characterized in that signal conversion means is provided for each of a plurality of analog telephone subscribers. 5. In a remote station device separated from the master station and connected via a PCM line, there is an analog telephone subscriber circuit for terminating analog telephone subscribers and an I terminal for terminating digital terminals.
The SDN subscriber circuit, the analog telephone subscriber circuit, and the ISDN subscriber circuit are connected via a traffic concentration switch that concentrates traffic and a semi-fixed path of the traffic concentration switch, and are connected to An ISD characterized in that it comprises signal conversion means for converting on-hook signals, dial pulses, multi-frequency signals and audible signals into D-channel protocol messages.
N remote station control method.