JPS6079896A - Channel connecting system - Google Patents

Abstract

PURPOSE:To attain flexible and minute sharing by connecting time division switches in cascade via a transmission highway in the same transfer direction in a channel connection of a digital exchange to constitute a loop network. CONSTITUTION:The time division switches TSWo-TSWn are connected in cascade respectively via a highway HW to constitute a loop network. The highway HW connected among the adjacent switches TSWo-TSWn has the identical transfer direction to attain economy by large group or high multiplexing. In taking the number of the time division switches as N, the number of routes of the highways among the time division switches is N in this system, while that of a conventional system is NX(N-1)/2. In increasing the number of the switches TSWo-TSWn, the effect of the reduction of the route number, i.e., number of the highways is remarkable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a communication line device for a medium- and small-capacity digital exchange and a communication line connection system in a communication line network.

(Prior art) The main methods of connecting time-division switches that have been implemented in the past include installing a highway switch between time-division switches and directly connecting time-division switches with a pair of highways in different directions. There is.

FIG. 1 shows a system in which a highway is installed between time division switches, where TSW is a time division switch and Hwsw is a highway switch. In this system, a highway switch HWSW in which a space-division gate array is operated in a time-division manner is installed between the time-division switches TSW, but currently, one time-division switch is highly multiplexed in consideration of economic efficiency. The call volume capacity is quite large because it is used. Therefore, if a three-stage network is configured by combining the time division switch TSW and the highway switch F and M, it is possible to carry a large call volume and is suitable for a large-scale network, but it is not suitable for a small network. Not economical. 'On the other hand, in the connection method using highway pairs between time-division switches shown in Fig. 2, highway pairs in different directions are required between all the time-division switches TSW. ing. For example, on a 2 Mbit/s highway, there are 32 time slots and 8 Mbit/s.
The S highway has 128 time slots, which is too large as a unit for traffic distribution between time division switches, and there is no flexibility in distribution. Furthermore, since the time division switch also accommodates terminal equipment, it is not possible to allocate all the time slots in and out of the time division switch to inter-switch traffic, and the number of time division switches that can be distributed is limited, making it difficult to expand. Poor. In addition, there are currently examples in which small and medium-temperature networks are used by reducing the multiplicity of the large-scale network, or by using a single-stage time-division switch network that is limited to small-scale networks.

As mentioned above, in the current situation where we are trying to achieve economic efficiency through high integration and high multiplexing, it is necessary to use conventional technology to construct a network that is economically expandable for non-small stations or medium-temperature networks. The disadvantage is that it lacks consistency.

(Object of the Invention) The object of the present invention is to solve these drawbacks, to enable flexible and small-scale allocation of traffic within and between time-division switches, and to achieve economy and scalability from small scale to medium scale. This will be described in detail below.

(Structure of the Invention) The present invention provides a first connection state that accommodates one or multiple terminal devices and connects a time slot from an input highway to the same position as the input time slot of an output highway; a second time slot connected to the input time slot position on the input side of the terminal device and a time slot from the output side of the terminal device connected to the same position as the input time slot on the connection state, connecting the output side time slot of the terminal device to the input side time slot position of the other terminal device, and connecting the output side time slot of the other terminal device to the input side time slot position of the terminal device; This communication path connection system is characterized in that time division switches capable of having a third connection state are connected in cascade via a digital signal transmission highway in the same transfer direction to form a loop network.

(Embodiment) FIG. 3 is a configuration block diagram showing an embodiment of the present invention,
This figure shows a communication path device in which time-division switches TSWo to TSWn are connected in cascade through respective wires to form a loop-like network.

The highways connecting the adjacent time division switches TSWo to TSWn all have the same transfer direction, making it possible to achieve economy through large grouping or high multiplexing. or,
When the number of time-division switches is N, the number of highway routes between time-division switches is shown in Fig. 2, but in the case of the present invention, it is N, and the time-division switches TSWo = TSW
When n is increased, the effect of reducing the number of routes, that is, the number of routes, is significant.

FIG. 4 is a block diagram showing the configuration of a time division switch in an embodiment of the present invention, which is the same as that used in the prior art. In the same figure, SP is a serial-to-parallel converter, I MUx is a multiplexer, SPM is a channel memory, SCM is a switch control memory, and DMTJX is a switch control memory.
is a demultiplexer, and PS is a parallel-to-serial converter. The channel memory SPM temporarily stores time slots from the network and terminal equipment. There are sequential write/random read (SW-RR) formats and random write/sequential read (RW-sR) formats for accessing the channel memory SPM, and in the description of this embodiment, the 5W-RR format will be used. In this case, the switch control memory SCM operates in synchronization with the output highway, and the read data of the switch control memory SCM is stored at the time slot storage address in the channel memory SPM that is output to the output highway. , which is written by an external processing device.

FIG. 5 explains the connection operation function of the time division switch TSW. Figure 5(a) shows the input highway INHW.
FIG. 4 is a block diagram illustrating a bypass state in which a time slot from 0UTHW is inserted at the same position as the input time slot of output highway 0UTHW.

The input time slot TSa of the storage position TSNa of the input highway INHW is stored at the 8th address of the speech path memory SPM (the storage area 1 is stored by a of the storage position TSNa).
゛Response has been decided, but please note the call route! 7 Since storage to SPM is sequential write, input highway INHW
input time slots TSa from
At the time of output to the accommodation position TSNa which is the same position as
The address ai of the switch control memory SCM synchronized with the output highway (accommodation location T of the output highway)
The content a of address (addressed by SNaOa) is read out, the content a becomes the read address of the speech path memory SPM, and the content TSa at address a is read out and output to the accommodation position TSNa of the output highway 0UTHW. Here, the content a at address a of the switch control memo IJ SCM has been written in advance by an external processing device (not shown). With the above operation, the time slot TSa on the input highway INHW is bypassed onto the output highway 0UTHW via the time division switch TSW, and the connection state 1 is established. The above time slot becomes an empty time slot that circulates on the loop and is not connected to a terminal device when all the time division switches TSWo=TSWn on the loop network shown in FIG. 3 take the connection state 1.

FIG. 5(b) explains the connection state 2 of the time division switch TSW, in which the storage position TSN on the input highway is
The time slot TSa of a is the same as above, the call route memo I
TSb is written to address a of SPM and output from the terminal device TRM) TSb is written to address b of speech path memory SPM. Switch control memo l)
Address a of the SCM contains the address of the communication path memory SPM (
address b) is also address b of the switch control memory SCM.
Address of call route memo IJ SPM address (address a)
has been written in advance by an external processing device.

Then, the accommodation position TSN of the output eway 0UTHW
At the time of insertion into the switch controller a, the contents of the address a of the switch controller o-le SCM are read out, the contents are taken to the address of the speech path memory SPM, the contents TSb are read out from this address, and the contents TSb are read out from the address of the output highway 0UTHW. is output to the accommodation position TSNa. Also, at the time of outputting the input time slot to the terminal device TRM, the contents a of the address b of the switch control memory SCM are read out, and then the contents a of the address b of the switch control memory SCM are read out, and then the contents a of the address b of the switch control memory SCM are read out, and then the contents a of the address b of the switch control memory SCM are read out.
Content TSa is read from Abilev address 8 of SPM,
It is output to the input time slot of the terminal device TRM. As a result of the above, the time division switch establishes the connection state 2. FIG. 6 shows a case in which data is transferred between terminal devices TRMa and TRMb, each connected to two time division switches in a loop network. In this case, the time division switches TSWo and TSWn are in the connection state 2, and the time division switches TSW, -TSWn-, are in the connection state I. The time slot Tsb outputted from the terminal device TRMb to the output highway is taken into the input highway of the time division switch TSWn via the time division switches TSW1 to TSW, . Connected to TRMa. Also, terminal device T
The time slot Tsa outputted from RMa to the output highway is bypassed by the time division switches in the loop network up to the time division switch T SWo issuing said time slot TSb. As described above, a connection is established between terminal devices accommodated in different time division switches by transferring two time slots TSa and TSb.

FIG. 5(c) explains connection state 3 showing the connection between two terminal devices TRMa and TRMb accommodated in one time division switch. Similarly to the above, the terminal device TR
Output time slot from Ma) TSIL is the call path memo 1. I Written to address a of SPM, terminal device TRM
The output time slot TSb from b is the communication path memory SP
Written to address b of M. In addition, by writing the address b of the communication path memory SPM at address a and the address a of the communication path memory SPM at address b from an external processing device in advance in the switch control memo IJ SCM, input to the terminal device TRMa is possible. At the time slot output time, the contents TSb of the address b of the call path memo IJ SPM are read and output, and at the input time slot output time to the terminal device TRMb, the contents TSa of the address a of the SPM is read out. and output. Through the above steps, a connection state 3 is established in which two terminal devices housed in the same time division switch are connected. In this way, the network configured in a loop by alternately connecting the time-division switch TSW and the no-way history having the same transfer direction, and the three connection states of the time-division switch, can be accommodated in any time-division switch. Connections between terminal devices accommodated in the same time division switch, connections between terminal devices housed in the same time division switch, and connections between other time division switches? It is possible to pinpoint empty time slots on a base or loop network.

As explained above, in this embodiment, by configuring a loop network by alternately connecting time-division switches and no-ways in the same transfer direction, it is possible to achieve economical efficiency in large grouping and high multiplexing. It is possible to provide an economical and scalable communication path connection system from small to medium-sized stations without being subject to any restrictions on the installation configuration of the time division switch in the network. Furthermore, the method of directly connecting time-division switches with a pair of highways in different directions, as shown in the prior art, requires a fixed jumper and is not flexible to fluctuations in inter-switch traffic; however, the time-division switch shown in this embodiment In connection state 2, an effective time division switch can be achieved by appropriately changing the allocation of time slots from or to the time division switch on the highway according to the number of time slots required between the time division switches. This can produce the effect of a variable junctor. Furthermore, the transition to connection state 2 of the time division switch shown in the above embodiment is applied to the outgoing line selection operation for other stations, and one or more time division switches on the loop network constitute one independent station. This has the advantage that large groups of inter-office trunk lines and high multiplexing can be performed more economically.

(Effects of the Invention) Since the present invention can provide an economical and expandable communication path connection system, it can be used in communication path devices and communication path networks of small and medium capacity digital exchanges.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating a conventional embodiment in which a highway switch is used for connection between time-division switches, FIG. 2 is a block diagram illustrating a conventional embodiment in which a highway pair is used in connection between time-division switches, and FIG. 4 is a block diagram of the time division switch, FIG. 5 is an explanatory diagram illustrating the connection operation of the time division switch, and FIG. 6 is a diagram showing the connection between the time division switches in an embodiment of the present invention. FIG. 2 is an explanatory diagram showing connections between terminal devices housed in a switch. TSWo % n...Time division switch, SP...Serial to parallel converter, MTJX...Multiplexer, SPM...
Communication path memory, DMUX... demultiplexer, PS
・・Parallel-serial converter, ・・Highway, SCM ・・Switch control memory, TRM, TRMa, TRM
b = one terminal device, INHW--input highway, 0
UTHW...Output highway. Patent applicant: Oki Electric Industry Co., Ltd. Figure 5 (b) SPM Figure 5 (C) Figure 6 TRMb TRM. Director General of the Japan Patent Office 1. Indication of the case 1987 Patent Application No. 187123 2. Name of the invention Communication path connection method 3. Person making the amendment Relationship with the case Patent applicant 6. Contents of the amendment As shown in the attached sheet +71, /'7TI”
'y6 Contents of amendment (1) In the 18th line of page 5 of the specification, the phrase "configuration block diagram" is amended to read "block configuration diagram." (2) In the 8th line of page 9 of the same book, the phrase ``Address (address b) is'' is corrected to ``Address b is .'' (3) From the 9th line to the 10th line of the same page, “Address (a
Correct the phrase ``Address)'' to ``Abirefu 8''.

Claims (2)

[Claims] (1) A first connection state that accommodates a plurality of terminal devices and connects the time slot from the input way to the same position as the input time slot of the output way, and the input time slot from the input highway. a second connection state in which a time slot from an output side of the terminal device is connected to a time slot position on an input side of the terminal device to the same position as the input time slot on an output highway; and an output of the terminal device. and a third connection state in which the side time slot is connected to the input side time slot position of the other terminal device, and the output side time slot of the other terminal device is connected to the input side time slot position of the terminal device. A communication line connection method characterized by cascading time-division switches capable of transmitting multiple signals via digital signal transmission channels in the same transfer direction to form a loop-like network. (2) One or more time division switches constitute an independent station, the digital signal transmission highway is used as an inter-office trunk line, and the inter-station trunk line is established by shifting the time division switch to the second connection state. 2. The communication path connection system according to claim 1, wherein the communication path network connection between stations is established by making a selection.