JP2993963B2 - Multi-switch system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multiple switch system for digitally exchanging communication information at various code rates of voice and data. [Prior art] Conventionally, this type of multi-switch system connects a telephone and other data terminals and trunk lines to a main switch of 64 Kbps based on the digital voice code transmission standard, and a data communication code for an analog analog line is used. To increase the efficiency of using 64Kbps for trunk lines due to low speed, auxiliary switches for low speed were installed as sub-rate switches. This will be described with reference to FIG. FIG. 7 is a block diagram showing an example of the prior art. In FIG.
The transmission / reception path of telephone 91, data terminal 92, and trunk line 93 is
It is accommodated and connected to a 64 Kbps main switch 94. Connection control device
95 receives call control information from the line connected via the main switch 94 and controls the switching connection processing of the main switch. Some data terminals 92 have a low-speed transmission specification of, for example, 300 bps for an analog voice line. However, according to the transmission speed of 8 Kbps × 2 ⁿ (n is a positive integer or zero) according to the CCITT recommendation, 8 Kb
Auxiliary switch 96 for switching connection processing with ps is installed, 64
Receives the output of the main switch 94 through the decompressor 97 that extracts the data code of 8 Kbps from Kbps and converts the data code of 8 Kbps to 64 K
The data is output to the main switch 94 via a multiplexer 98 incorporated in bps. That is, the decompressor 97 extracts the information code from the 64 Kbps code received via the main switch 94, forms it into 8 Kbps and outputs the same, and also restores the 64 Kbps received from the trunk line 93 into eight 8 Kbps and outputs them. . The multiplexer 97 inserts the transmission code of each data terminal 92 of 8 Kbps received from the auxiliary switch 96 into a part of 64 Kbps for the data terminal 92, and outputs eight data terminals for output to the trunk line 93. The transmission code for the device 92 is multiplexed to form 64 Kbps. [Problems to be Solved by the Invention] As described above, in the conventional multiple switch system, an auxiliary switch of 8 Kbps is connected through a decompressor and a multiplexer of a 64 Kbps main switch, and a low-speed data transmission is performed. It is designed to handle data exchange of data terminals, so not only extra equipment such as decompressors, multiplexers and auxiliary switches are installed, but also terminals that accommodate more than the required lines for future expansion. The switch has the problem that it is uneconomical. An object of the present invention is to provide a multiple switch system that solves the above problems. [Means for Solving the Problems] A multiple switch system according to the present invention has the following configuration in a multiple switch system that accommodates terminals having different code transmission speeds and performs switching processing according to the code transmission speed of each terminal. It is characterized by having. (A) a high-speed communication path composed of a plurality of parallel sub-channels for transferring information in byte units; (B) a communication path control for outputting a clock pulse and a frame head pulse for defining a time slot position in each sub-channel A device connected to a high-speed communication path, accommodating a number of terminals according to a code transmission rate of each terminal, and inputting an input signal of the accommodated terminal according to the code transmission rate of the terminal; , A switch provided in such a manner that the sub-channel numbers in the parallel sub-channels corresponding to the sub-channels and the time slot positions in the respective sub-channels are specified and output, and distributed in a number corresponding to the number of terminals to be accommodated and the code transmission rate; ) An input signal of a terminal in the switch is converted to a sub-channel in a parallel sub-channel corresponding to a high-speed communication path according to the code transmission rate of the terminal. No. and connection control unit which instructs to identify the time slot position in each sub-channel. Embodiment Next, a multiple switch system according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and shows a transmission system in which an accommodation line 10 including a trunk line and a terminal line transmits an information code to a communication path (bus) 30 via a switch 20. In the receiving system, the code transmission direction is reversed with respect to the transmitting system. If the accommodation line 10 is, for example, a trunk line and a telephone,
The switch 20 is connected to the switch 20 at a code transmission rate of 64 Kbps or 8 Kbps for a data terminal. The switch 20 is, for example, 8
It is connected to a communication path control device 40 via a communication path 30 having eight sub-channels for a 1-bit information code format. The channel control signal 40 is transmitted to all the connected switches 20.
Of the transmission system and the frame head pulse. Connection control device 50 for controlling switch 20
Outputs the byte position and the time slot position used in the transmission system to the transmission unit of the switch 20 as connection control information for each switch 20 and for each transmission / reception unit. The switch 20 has a byte position designation unit 201 and a slot designation unit 202 in each of the transmission unit and the reception unit, and is designated by the information on the byte position and the time slot position received from the connection control device 50. These designation sections 201
Details of 202 will be described later with reference to FIGS. 4 and 5. FIG. 2 is a system configuration diagram showing an example of a system formed by the components shown in FIG. A telephone 11 and a data terminal 12 terminating a terminal circuit are distributedly connected to switches 21 and 22, respectively, and an exchange terminating a trunk line.
The switch 60 is connected to the switch 23, and the switches 21 to 23 are switched from the transmission path to the reception path by the communication path control device 40 via the communication path 30. The connection control device 50 is connected to the switches 21 to 23,
It receives call control information from the telephone set 11, the data terminal 12, and the exchange 60, and transmits switch connection control information. The switches 21 to 23 are distributed, for example, such that switches are provided for each accommodation line. FIG. 3 is a connection diagram showing an example of a connection status of the communication path control device 40 to the switches 21 and 22 in FIG. In FIG. 3, the transmission system and the reception system have almost the same structure, and in each system, the communication paths 31 and 32 clock pulses 41 and 42 and the frame head pulses 43 and 44 are connected to the switches 21 and 22 and the communication path control device.
Connect with 40. The communication path 31 transmits communication information from the switches 21 and 22 to the communication path control device 40. The communication path 32, the clock pulses 41 and 42, and the frame head pulses 43 and 44 are transmitted from the communication path control device 40 to the switches 21 and 22. Transmit information to Next, the switch operation will be described with reference to FIG. 4 together with FIG. 4 and FIG. FIG. 4 is a time chart showing an example of a pulse handled by the switch 20 of FIG. 1, and FIG. 5 is a connection diagram showing an example of designation of a byte position and a slot position for two of the switches of FIG. . In FIG. 4, the clock pulse determines the time slot position of the code pulse transmitted on the communication path 30. The frame head pulse is one frame (12
Every 5 μs). Accordingly, the switch 20 receives the clock pulse and the frame head pulse, and numbers the time slots from the number 0 to the end of one frame. When one communication path 30 is a high-speed transmission path of 8 Mbps, numbers 0 to 1023 are assigned to the time slots. If one communication path 30 is formed by eight sub-channels (numbers 0 to 7), it will have a code transmission rate of 64 Mbps, and if one byte is 8 bits, one byte is stored in one time slot. Can be inserted. FIG. 4 shows a state in which time slot number 1 is specified for subchannel numbers 0-7. In FIG. 5, the terminal (A) having a code transmission rate of 64 Kbps is connected to the communication channel 31 via the byte position designation unit 211 and the slot designation unit 212 by using subchannel numbers 0 to 7. Connection control device 50 for 64Kbps terminal (A)
Gives the byte position designation unit 211 a direct connection instruction for each of the sub-channels of numbers 0 to 7 and the slot designation unit 212 an instruction to designate the same time slot for all eight sub-channels. Therefore, each time communication information is transmitted, the slot designation unit 212 of the switch receives designation of a time slot number. Further, the terminals (B) and (C) of 32 Kbps can be accommodated and connected to one switch. In FIG. 5, the byte position specification section
Reference numeral 221 designates, for example, sub-channels 0 to 3 to which the terminal (B) is connected by the communication path 31 by specifying the byte position of the connection control device 50.
Of the sub-channels 0 to 3 or the sub-channels 4 to 7 are determined. Further, the slot specifying unit 222 specifies the same time slot number only for the sub-channel specified by the connection control device 50, for example, only for the sub-channels 0 to 3. Therefore, the other terminal (C) uses the remaining subchannels even when the terminal (B) is operating,
Communication information can be transmitted using an empty time slot. FIG. 5 shows an example in which one byte of 8 bits is divided into one group or two divisions. However, four divisions, eight divisions and 2 ⁿ divisions are possible, and in the case of eight divisions, an 8 Kbps terminal is connected to one switch. Up to eight can be accommodated, and each terminal can be assigned one of the eight sub-channels, and the slot position can be assigned for each sub-channel. In the above embodiment, the description has been made on the assumption that one byte is 8 bits.
A communication path having a number of sub-channels equal to the number of bits of one byte, or a communication path having a number of sub-channels equal to the number of bits for a plurality of bytes may be used. FIG. 6 is a time chart showing an example of parity bits applied in the case of FIG. Fig. 6 (A) is 64
Parity bits P is transmitted in 9 -th subchannel for the code b ₀ ~b ₇ to be transmitted for eight subchannels 0-7 in the case of Kbps code transmission. The frame head pulse position is the time slot number 0.1 of each transmission bit.
・ Determine 2.3. FIG. 6 (B) shows that 8 bits of 1 byte are divided into sub-channel numbers 0-3 and 4-7.
This shows a case of code transmission at 32 Kbps, in which sub-channel numbers 0 to 3 are transmitted with codes a _{0 to} a ₃ , and sub-channel numbers 4 to ₇ are transmitted with codes b _{4 to} b ₇ . Since the frame head pulse position determines the time slot numbers 0, 1, 2,... Of each transmission bit and divides the sub-channel into two, frames are numbered alternately first and second. Figure 6 (B) of the sub-channel in the first frame code a ₀ for ~a ₃ parity bits Pa, also the parity bits Pb of the eighth each of the second frame in the sub-channel code b ₄ ~b ₇ Transmit to parity bit channel.
This parity bit Pa is code a ₀ ~ a same time slot number of the second frame immediately preceding the code a ₀ ~a ₃ of the first frame
a ₃ for 8 bits. Parity bit Pb
It is formed for 8-bit code b ₄ ~b ₇ of the same time slot number of the first and second frames. Therefore, when the subchannel of the same time slot is divided into n, the parity bit appears in every nth frame. In the above-described embodiment, the time slot designation lines are combined for each divided byte by the slot designation unit shown in FIG. 5, but the combination is for explanation and does not exist as hardware. For example, the slot specifying unit 212 specifies the same time slot number independently for each of the sub-channel numbers 0 to 7 independently of the connection control device. Thus, the contents shown and described in the present embodiment do not limit the present invention. [Effects of the Invention] As described above, according to the multiple switch system of the present invention, a high-speed transmission path is used as a communication path (bus) for accommodating a predetermined number of terminals or trunk lines with respect to a conventional large-capacity switch. Small switches are distributed and connected for each line, and each byte is 2n
By dividing the data so as to transmit the data at a low speed, it is possible to obtain an economical improvement effect that the switch can be provided as much as the line actually accommodated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a multiple switch system according to the present invention, FIG. 2 is a block diagram showing an example of a system constituted by the switch shown in FIG. 1, and FIG. FIG. 4 is a connection diagram showing an example of connection between the switch and the control device, FIG. 4 is a time chart showing an example of a pulse handled by the switch in FIG. 1, and FIG. 5 is a connection showing an example of a designated state of the switch in FIG. FIG. 6 is a time chart showing an example of a parity bit applied to FIG. 5, and FIG. 7 is a block diagram showing an example of the prior art. 10 accommodation line, 20, 21, 22, 23 switch, 30 communication path (bus), 40 communication path control device, 50 connection control device.

Claims (1)

(57) [Claims] High-speed communication composed of multiple parallel sub-channels that transfer information in byte units in a multiple switch system that accommodates terminals with different code transmission rates and performs switching processing according to the code transmission rate of each terminal A channel control device that outputs a clock pulse and a frame head pulse defining a time slot position in each of the sub-channels; and a number corresponding to the code transmission rate of each terminal connected to the high-speed communication path. The terminal accommodates the terminal, and outputs the input signal of the accommodated terminal by specifying the subchannel number in the parallel subchannel corresponding to the high-speed communication path and the time slot position in each subchannel according to the code transmission rate of the terminal. Switches distributed in number according to the number of terminals to be accommodated and the code transmission rate; Connection control instructing to specify an input signal of a terminal in a switch to a sub-channel number in a parallel sub-channel corresponding to the high-speed communication path and a time slot position in each sub-channel according to a code transmission rate of the terminal. A multi-switch system comprising a device.