JPH03104334A - Control channel termination system - Google Patents

Abstract

PURPOSE:To offer the service of the D channel common line signal system without new provision of a communication network by terminating existing various transmission lines and assigning them to a digital multiplex transmission line. CONSTITUTION:A frame signal based on a high level data link procedure is generated as a control channel signal 7 from plural kinds of control signals 6 such as call control signals. Then a control channel signal multiplex means 5 assigns a time slot on a digital multiplex transmission line 8 to each control channel signal 7 generated by a control channel signal generating means 4. Succeedingly a control channel signal demultiplex means 9 assigns a time slot on the digital multiplex transmission line 8 to a control signal channel to separate user information 11 and the control channel signal 7. A control channel signal extract means 10 extracts a relevant control signal 6 from each separated control channel signal 7.

Description

[Detailed Description of the Invention] [Summary] Regarding a control channel termination method with a large degree of freedom in a digital multiplex interface, various existing transmission lines are terminated, and the number of control signal channels to be terminated changes accordingly. The purpose of this technology is to flexibly and efficiently terminate each control channel and allocate it to a digital multiplex interface. a control channel signal generation means for generating a signal; and a plurality of control channel signals generated by the means, among the time slots multiplexed on the digital multiplex transmission path, any plurality of time slots as a control signal transmission channel. control channel signal multiplexing means for dividing and multiplexing control channel signals.

[Industrial application field]

The present invention relates to a control channel termination method with a large degree of freedom in a digital multiplex interface.

[Conventional technology]

Conventionally, digital multiplex interfaces have a transmission rate of 1, which multiplexes 24 digital channels.
．． A 544 MHz/sec interface or a 32 channel, 2.048 Mbit/see interface is adopted.

In such a digital multiplex interface, when transmitting and receiving control signals such as call control information between each station, an individual line signaling method has been adopted in which each communication line is used to transmit and receive each control signal.

However, with the development of ISDN (Integrated Service Digital Network), a wide variety of services are being provided, and the amount and type of control signals between stations has increased, resulting in faster and larger-capacity signaling systems. These demands are becoming increasingly important, and the conventional individual line signaling system is no longer able to meet these demands.

Therefore, a common line signaling system in which control signals are sent and received using a common data line has come to be adopted.

A typical common line signaling system in ISDN is No. There are 7 common line signaling systems and D channel common line signaling systems. No. The 7 common line signaling system is originally a signaling system suitable for voice communication, and the D channel common line signaling system is
This is a system suitable for data communication (hereinafter, the No. 7 common line signaling system will be explained as being included in the D channel common line signaling system).

FIG. 5 shows the structure of a general digital signal network. Each PBX (private branch exchange) 1 that accommodates each user terminal is
Each digital multiplex interface 3 is connected to a public network P via each transmission device 2.

The type of digital multiplex interface 3 is, for example, a 30 B interface with a transmission rate of 2.048 M bits/sec, consisting of 30 B channels and one D channel.
+D digital multiplex interface (hereinafter referred to as 2M multiplex interface), or 23 B channels and 1
The transmission speed of the D channel is 1. 544M
There are 2 3 8+D digital multiplex interfaces (hereinafter referred to as 1.5M multiplex interfaces) 2 with bits/sec.

FIGS. 6(a) and 6(b) show data formats of the above-mentioned 2M multiplex interface and 1.5M multiplex interface. In the 2M multiplex interface shown in (a) of the same figure, the channel number (time slot) on the transmission path is 0.
Channel C for performing frame control is assigned to channel number 1, and channel D for transmitting control signals is assigned to channel number 16. 01-1 other than those
Thirty line channels B for transmitting user information are allocated to channels 5 and 17 to 31. Next, in the 1.5M multiplex interface shown in FIG. 6), bit F for frame synchronization is assigned to the first bit on the transmission path, and channel D for transmitting a control signal is assigned to channel number 23. 00-2 other than those
Channel 3 is allocated 23 line channels B for transmitting user information. [Problem to be solved by the invention] As shown in Fig. 5, when a network is constructed via public M4P such as ISDN dedicated to digital signals, channel positions are fixedly determined in advance as shown in Fig. 6. By using the D channel, control signals can be efficiently transmitted.

However, when attempting to send and receive control signals by setting up a digital multiplex interface using an existing network, for example in a specific company communication, etc., the channel position may be changed as shown in Figure 6 (a) or (b). There are disadvantages in using a fixed D channel. In other words, for example, if you want to terminate a total of five digital multiplex transmission lines such as three 5B+D, 4B+D, and 7B+D as existing transmission lines and connect them to a PBX with a 2M multiplex interface, the B channel will be 2.
It is sufficient to terminate 6 channels, while 5 channels of D channel need to be terminated. However, the conventionally defined 2M multiplex interface is as shown in Fig. 6(a).
It has a fixed form of 0B+D and cannot be handled as is.

As mentioned above, in corporate networks that do not require a public network, it is necessary to terminate various existing digital multiplex transmission lines and flexibly allocate channels that handle control signals to the terminated digital multiplex interface accordingly. However, conventional digital multiplexing interfaces in which the number and location of D channels are fixed have the problem of not being able to efficiently terminate control channels in such networks.

The present invention makes it possible to terminate various existing transmission lines, and even if the number of control signal channels to be terminated changes accordingly, each control channel can be terminated flexibly and efficiently and assigned to a digital multiplex interface. The purpose is to

[Means to solve the problem]

The present invention provides a termination method for terminating a digital multiplex transmission line, which first includes control channel signal generation processing means for generating a plurality of control channel signals 7 from a plurality of types of control signals 6. This means generates a frame signal based on a high-level data link procedure as a control channel signal 7 from a plurality of types of control signals 6 such as call control signals.

Next, control is performed to allocate and multiplex each control channel signal 7 generated by the control channel signal generation means 4 to a control signal transmission channel by arbitrarily plural time slots among the time slots on the digital multiplex transmission path 8. It has 5 channel signal multiplexing stages. The means includes, for example, a control channel signal 7 output from the control channel signal generation stage 4.
a memory that temporarily holds a frame signal, a timing generation circuit that generates a timing signal that becomes active in a plurality of pre-allocated time slots of the digital multiplex transmission line 8, and each timing signal that becomes active. A selector or the like reads out a frame signal, which is a control channel signal 7, temporarily held in a memory in the ξ ring, and multiplexes it into an empty time slot to which user information l1 is not allocated.

Subsequently, there is provided a control channel signal separation stage 9 for allocating arbitrary plurality of time slots among the time slots on the digital multiplex transmission line 8 to control signal receiving channels and separating the control channel signal 7. This means has, for example, the opposite structure to the control channel signal multiplexing means described above, and separates the user information 11 and the control signal 7.

The control channel signal extraction means 10 extracts a plurality of types of corresponding control signals 6 from each control channel signal 7 separated by the thousand control channel signal separation stages 9.

This means has a structure opposite to that of the control channel signal generating means 4 described above.

[For production]

For example, when terminating a plurality of existing digital multiplex transmission lines to generate the digital multiplex transmission line 8 shown in FIG. After being converted into a control channel signal 7 by the channel signal generation stage 4, it is multiplexed into a plurality of pre-allocated time slots of a digital multiplex transmission line 8 by a control channel signal multiplexing means 5. Further, the control channel signal separating means 9 and the control channel signal extracting means 10 perform operations completely opposite to the above.

Therefore, even if various existing transmission lines are terminated and the number of control signal channels to be terminated changes accordingly, each control channel can be terminated flexibly and efficiently and the digital multiplex transmission line 8 can be terminated.
It becomes possible to allocate to

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a network diagram of an embodiment of the present invention.

PBX12-1-1 that accommodates each terminal not shown in particular
2-3 etc. are digital multiplex interfaces 14-1~
It is connected to each transmission device 13-1 to 13-3 by l4-3. Each of the transmission devices 13-1 to 13-3 is connected to other transmission devices by a plurality of existing transmission paths each having a different transmission speed, without going through a public network. For example, regarding the transmission device l3-1, it is connected to other transmission devices through a plurality of existing transmission paths consisting of a first path 15-1 to a fifth path 15-5. In this case, each route is 5B+D, 4B+D, 5B+D, 7B+D, 5B+
It has a channel configuration of D.

In the case of the above configuration example, in this embodiment, PBX 12-1
A 26B+5D channel structure can be realized as the digital multiplex interface 14-1 between the transmission device 13-1 and the transmission device 13-1. In addition, 2 is used as a digital multiplex interface 14-2 between the PBX 12-2 and the transmission device 13-2.
1B+3D, 27B as digital multiplex interface 14-3 between PBX 12-3 and transmission device 13-3
+4D, a combination of B channel and D channel can be flexibly assigned according to the termination status of each transmission device 13-1 to 13-3.

Each PBX12-1 to 12-3 to realize the above precepts
FIGS. 3(a) and 3(b) show structural diagrams of an embodiment of the present invention regarding the portion that processes the D channel within the system. Hereinafter, PBXs 12-1 to 12-3 will simply be referred to as PBX 12, transmission devices 13-1 to 13-3 will simply be referred to as transmission device 13, and
Digital multiplex interfaces 14-1 to 14-3 will be simply referred to as digital multiplex interface 14.

First, FIG. 3(a) shows the procedure on the transmitting side for multiplexing control signals to the digital multiplexing interface 14.

In ISDN, information on each user is transferred from a terminal (not shown) to the PBX 12 in FIG.
The signal is multiplexed into the B channel time slot in the format shown in , and is input as the B channel signal Bch.

On the other hand, control signals 22 such as call control signals generated within the PBX by software processing 20 on the transmitting side are transmitted to multiple Dch
A frame signal 23 in HDLC (high-level data link procedure) format is assembled here by a processing circuit 16.

This frame signal 23 is output via the digital multiplexing circuit 17 as the D channel signal Dch shown in FIG. 3(a) (2).

This signal and the 20B channel signal Bch of the form 2 shown in FIG. The signal is output to the transmission line 13 (see FIG. 2).

Here, the Dch insertion selector 19 uses a timing signal 24 output from the Dch insertion timing generation circuit 18.
The D channel signal Dch from the digital multiplexing circuit 17 is selected at the timing when the signal becomes active, and the B channel signal Bch is selected at other timings.

In the above configuration, the digital multiplex circuit l7 and Dch
The insertion timing generation circuit 18 is operated by software control '4I.
21 controls the operation.

Next, FIG. 3(b) shows a structure on the receiving side that separates the control signal from the digital multiplex interface 14.

Among the multiplexed signals manually input in the mB+nD format of ■ in Figure 3(b), the B channel signal Bch is transmitted to the PBX 12.
The data is then transferred as is to a terminal (not shown).

On the other hand, the D channel signal Dch is controlled by the software control 26.
The frame signal 2 is separated from the B channel signal Bch in the digital multiplexing/demultiplexing circuit 24 operating under the control of the frame signal 2.
Extracted as 3.

This frame signal 23 is input to the multiple Dch processing circuit 25 and is then input to the aforementioned multiple Dch processing circuit 16 (FIG. 3(a)).
) is decomposed into the control signal 22 by a process completely opposite to that of the control signal 22.

This control signal 22 is processed by software processing 27 on the receiving side to perform call control and the like.

The operation of the embodiment having the above structure will be explained below.

First, on the transmitting side in FIG. 3(a), the contents of each control signal 22 to be transmitted to a game player (or a plurality of game players) are set by software processing 20.

This control signal 22 is formatted into an HDLC format frame signal 23 in the multiple Dch processing circuit 16.

This frame signal 23 is temporarily held in a memory (not shown) within the digital multiplexing circuit 17.

On the other hand, from the 1st day of the Dch insertion timing generation circuit, the B channel input to the PBX 12 is controlled by the software control 21.
Timing signal 24 that becomes active when timing an empty channel to which channel signal Bch is not assigned
is output.

At the same time, the frame signal 23 temporarily held in the digital multiplexing circuit 17 is read out as the D channel signal Dch at the active timing.

Furthermore, the Dch insertion selector 19 selects the D channel signal Dch read out from the digital multiplexing circuit 17 at the active timing.

Then, at timings other than the above-mentioned active timing, the Dch insertion selector 19 outputs the B channel signal Bc.
Select h.

By the above operation, it becomes possible to output a multiplexed signal mB+nD ((2) in FIG. 3(a)) in which the B channel signal Bch and the D channel signal Dch are allocated at an arbitrary preset ratio.

Let us consider a specific example of the above multiplexed signal mB+nD. Now, for example, the transmission device iZ13-1 in FIG. 2 is composed of the first route 15-1 to the fifth route 155 as shown in the figure, and each has ten channels of 5B+D, 4B+D, 5B+D, 7B+D, and 5B. When terminating a plurality of existing transmission lines having a configuration, a fourth digital multiplex interface 14-1 between the PBX 12-1 and the transmission device 13-1 is used.
As shown in figure (a), channel numbers 06, 11, 16, 25
and 31, the D channel signal Dch is multiplexed, 2M
Can be multiple interfaces. On the other hand, as the digital multiplex interface 14-2 between the PBX 1 2-2 and the transmission device 13-2 in FIG. 2, the digital multiplex interface 14-2 shown in FIG.
A 1.5M multiplex interface in which the D channel signal Dch is multiplexed on channel numbers 05, 16, and 23 can be provided as shown in FIG.

Each of the above settings can be freely set using the software control 21 shown in FIG. 3(a).

Next, on the receiving side of FIG. 3(b), as shown in FIG. 3(a),
The exact opposite operation is performed on the sending side.

That is, although not specifically shown, the digital demultiplexing circuit 24 uses a software system? II26 generates timing similar to the timing signal 24 in FIG. 3(a). As a result, the D channel signal Dch, which is manually input via the digital multiplex interface 14, is transferred to a memory (not shown) in the digital multiplex/demultiplexer circuit 24, in a completely opposite operation to that of the digital multiplex circuit 17 in FIG. 3(a). temporarily taken in.

The D channel signal Dch is then input in the form of a frame signal 23 to a multiple Dch processing circuit 25, where the control signal 22 is taken out.

Thereby, the D channel signal Dch can be extracted from the arbitrary format multiplexed signal mB+nD inputted from the digital multiplexing interface 14.

〔Effect of the invention〕

According to the present invention, even if various existing transmission lines are terminated and the number of control signal channels to be terminated changes accordingly, each control channel can be terminated flexibly and efficiently and assigned to a digital multiplex transmission line. becomes possible.

This makes it possible to provide services using the D channel common channel signaling system (or No. 7 common channel signaling system) without installing a new network.

In this case, it becomes possible to allocate each control channel to a digital multiplex transmission path without waste, so there is no need to perform arbitrary route division or allocate unnecessary channels.
It also has the effect of making effective use of the line.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a network structure diagram of an embodiment of the present invention, Fig. 3(a),
4(b) is a diagram showing the configuration of an embodiment of the present invention, FIGS. The configuration diagram of the signal network, FIG. 6(a), middle) is a diagram showing an example of general channel allocation on a transmission path. 4... Control channel signal generation means, 5... Control channel signal multiplexing means, 6... Control signal, 7... Control channel signal, 8... Digital multiplex transmission line, 9... Control channel signal separation means;

Claims (1)

[Claims] 1) In a termination method for terminating a digital multiplex transmission line (8), control channel signal generating means (4) generates a plurality of control channel signals (7) from a plurality of types of control signals (6). and assigning a plurality of arbitrary time slots among the time slots multiplexed each of the plurality of control channel signals (7) generated by the means onto the digital multiplex transmission line (8) to a control signal transmission channel. , a control channel signal multiplexing means (5) for multiplexing control channel signals. 2) In a termination method for terminating the digital multiplex transmission line (8), an arbitrary plurality of time slots among the time slots multiplexed on the digital multiplex transmission line (8) are allocated to the control signal reception channel, and the Control channel signal separation means (9) for separating a plurality of control channel signals (7)
and a control channel signal extraction means (10) for extracting the corresponding plurality of types of control signals (6) from each control channel signal (7) separated by the means. method. 3) In a termination method for terminating a digital multiplex transmission line (8), a control channel signal generating means (4) for generating a plurality of control channel signals (7) from a plurality of types of control signals (6); A control channel that allocates and multiplexes each of the plurality of control channel signals (7) to a control signal transmission channel among the time slots multiplexed on the digital multiplex transmission line (8). a signal multiplexing means (5), and the digital multiplex transmission line (
8) control channel signal separation means (9) for allocating arbitrary and plurality of time slots among the time slots multiplexed on the control signal receiving channel and separating the plurality of control channel signals (7); A control channel termination method comprising: control channel signal extraction means (10) for extracting the plurality of types of control signals (6) corresponding to each control channel signal (7) separated by the means.