JPH03212100A - Time division exchange - Google Patents

Abstract

PURPOSE:To eliminate need for a special phase adjustment by connecting at least one package accommodating lines and a control package with one high speed transmission line so as to form a loop and sending a signal in the packet form sequentially. CONSTITUTION:A key telephone system 10 being a time division exchange connects one control package 11, plural extension packages 12 and plural line wire packages 13 with one high speed transmission line 14 respectively. Then user information and a signal of a transmission format having a start code and an end code to the start and end positions and an address and a channel number at a prescribed position in succession to the start code respectively are sent/received to/from the transmission line 14 at a high speed of at least 10Mbps. Thus, it is not required to adjust any special phase sequence.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention accommodates and connects a plurality of extension lines terminated at a terminal and at least one outside line terminated at an exchange in each of a plurality of packages. The present invention relates to a time-division switching device that connects packages using transmission lines using digital codes to exchange connections between extension lines and between extension lines and external lines.

[Conventional technology]

Conventionally, this type of time division switching equipment consists of an extension package that connects multiple extension lines terminating at a terminal, an outside line package that connects multiple outside lines that terminate at the exchange, and a communication transmission line and a control transmission line for these packages. and a control package that exchanges and controls connections between extension lines and between extension and outside lines.

This will be explained with reference to FIG.

FIG. 6 is a block diagram showing a conventional example.

As shown in FIG. 6, the key telephone device 90, which is one of the time-sharing switching devices, includes a control unit package 91, a plurality of extension packages 92. and a plurality of outside line packages 93, these packages 91 to 93 are connected by a data transmission path based on a data transmission path of a communication transmission path 94 and a control transmission path 95.

The control unit package 91 has a time division switch and a control unit (both not shown), the time division switch is connected to the communication transmission line 94, and the control unit is connected to the control transmission line 95, respectively. Extension package 92 connects a key telephone as an extension. The outside line package 93 connects the telephone line from the exchange as an outside line. The telephone lines of the button telephone and the exchange are connected to the time division switch of the control unit package 91 via the respective packages 92 and 93 and the communication transmission line 94, and exchange control is performed by the control unit.

The communication transmission line 94 is a PCM (P
(ulse code modulation) A voice code based on 8 hits/8 kHz is transmitted in 8-bit units over a transmission path. Therefore, data other than audio is also formed in units of 8 bits at 8 KHz.

That is, 125 μs is configured as one frame.

Since one channel is in units of 8 bits, it has a capacity of 64 Kbps. Therefore, at a capacity of 1.5 Mbps, one frame can have 24 channels.

FIG. 7 is an explanatory diagram of a frame structure and switch control showing an example of a time division switch that connects communication transmission lines.

As shown in FIG. 7, an l frame (125 μs) is formed of 4 channels, and each channel has an 8-bit configuration. Now, as the first frame, from the first channel to the fourth
Each 8-bit code information 1-1 to 1-4 up to the channel
is input to the memory of the time division switch, followed by code information 2-1 to 2-4 of the second frame. The code information output from the memory is sequentially assigned frames for each channel by the time division switch control unit and output.
For example, code information 1- for channels 1 and 2 of the first frame
After 1.1-2 is output, code information 0-3 and O-4 of the previous frame may be output to channels 3 and 4. In this case, code information 1-3.1-4 is output following code information 2-1.2-2 in the next frame. In other words, it was a communication transmission line whose main purpose was audio transmission with one channel of 64 Kbps.

The control transmission line 95 in FIG. 6 is a signal transmission line mainly used for time-division switch control, and control messages having different data lengths are transmitted in packet format as needed.

[Problem to be solved by the invention]

As described above, the conventional time division switching device has a communication transmission line connected to a time division switch, and a control transmission line that transmits a switch control signal or a control message,
The communication transmission path is 64Kb based on voice transmission.
Since it has a channel configuration of ps, the number of channels will increase in the future.
When high-speed data of 4XN (N is a positive integer) Kbps occupies N channels and is transmitted as user information via a communication transmission line, the second and third channels are occupied in the example of Fig. 7. Since the temporal positions of the 8 bits are swapped as shown in the figure, there is a problem in that a special phase order adjustment is required.

The purpose of the present invention is to solve the above-mentioned problems by forming a packet format in which data including voice information is placed with a starting code and ending code before and after the data, and transmitting the formatted data to an internal high-speed transmission path. The purpose is to provide a replacement device.

[Means to solve the problem]

The basic configuration of the time division switching device according to the present invention is that a plurality of extension lines terminated at a terminal and at least one outside line terminated at an exchange are accommodated and connected in each of a plurality of packages, and a transmission line using digital codes is connected between the packages. A time division switching device that connects internal lines and exchanges connections between internal lines and external lines, which has a start code and an end code at the start and end positions, and an address and a channel number at predetermined positions following the start code, respectively. It has means for transmitting and receiving a data transmission format of at least one of user information and a signal to and from the transmission path at a high speed of at least 1 OMbps.

One embodiment of the time division switching device having the above-mentioned basic structure is to include means for inserting a count value as a transmission sequence number for each format into a predetermined position of the transmission format.

Another embodiment of the time division switching device according to the basic structure is that CCITT is added to the data position of the transmission format.
It is to have a means of inserting information channels according to the Recommendation I series channel types and interface structures.

Further, one of the specific configurations of the time division switching device according to the basic configuration is that one of the transmission formats includes means for inserting a plurality of pieces of data having the same originating and destination address.

〔Example〕

Next, the time division switching device of the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram 7772 showing an embodiment of the present invention.

As shown in FIG. 1, the key telephone device 10, which is a time-sharing switching device, includes one control package 11, a plurality of extension packages 12. Each of the plurality of external line packages 13 is connected to one high-speed transmission line 14.

The control package 11 is a control unit of the time division switching device, and controls the operational functions of the time division switch.

The extension package 12 accommodates a plurality of extension lines 21 terminating the key telephone 2o as channels CHI to CH-, and is connected to the high-speed transmission line 14.

The outside line package 13 accommodates a plurality of outside lines 31 connected to the exchange 30 as channels CHI to CH-, while
It is connected to all of the control package 11 and extension package 12 through a high-speed transmission line 14. Extension 21. Outside line 3
If the number of 1s is small, only one extension package 12 and one outside line package 13 are required. The high-speed transmission line 14 is 10M
It transmits digital codes at a high speed of bps or 30 Mbps, and supports 8KHz 8-bit telephone calls as well as channel Ha+ (
1,5Mb ps) and channel H12 (2Mb ps)
ps) and control messages from which the control package 11 originates and arrives.

FIG. 2 is a block diagram showing an example of a portion where the card package 40 forming the extension package 12 and the outside line package 13 in FIG. 1 is connected to the high speed transmission line (H/W) 14. The same applies to the connection portion of the control package 11 to the high-speed transmission line 14.

As shown in FIG. 2, the card package 40 is connected to the controller 4.
1. Data transmitting/receiving section 42. Signal forming section 43, signal identifying section 44. It has a H/W ink face section 45 and an insertion position detection section 46.

The control unit 41 includes the packages 11, 12, and 13 in FIG.
The operating functions of the card package 40 are controlled by exchanging control messages and various signals between them. Control unit 4 of card package 40 serving as control package 11
1 has an extension line 21, an outside line 31, and packages 12 and 13.
Various signals and control messages are also exchanged via one side of the high-speed transmission line 14 and the high-speed transmission line 14. The data transmitter/receiver 42 has extension 2
1 or external line 31, high-speed transmission line 1
4 and send/receive. The signal forming section 43 inputs control information from the control section 41, data information from the data transmitting/receiving section 42, and a package address serving as a source address from the insertion position reading section 46, and performs transmission on the high-speed transmission path 14. The data is formed into a format and output to the H/W interface unit 45. The signal identification section 44 identifies and classifies various information from the incoming transmission format to the card package 40 inputted from the H/W interface section 45 and outputs it to the control section 41 and the data transmitting/receiving section 42 . H/W
The interface unit 45 monitors the high-speed transmission path 14, transmits the output from the signal forming unit 43, and identifies the incoming format from the transmission format to the signal identifying unit 44.
Send to. For example, the insertion position reading unit 46 connects a power supply/earth to a predetermined position of a connector terminal of an insertion frame into which the card package 40 is inserted and fixed. The ground air is detected and output as a paracane atres to the signal forming section 43.

Next, the transmission format on the high-speed transmission line 14 shown in FIGS. 1 and 2 will be explained with reference to FIG.

FIG. 3 is an explanatory diagram showing an example of a transmission format on the high-speed transmission line 14.

As shown in Fig. 3, the transmission format has an octet structure, in which 8 bits are addressed in order: a start code, an address, a message type, a channel number, then 8XN bits of data, and finally an 8-bit end code. do. The 8 bits of the starting code include the initial code 1010 and a count value that is incremented for each format in which the control package passes through the high speed transmission line 14. The count value returns to the initial value after one cycle. The address is assigned a destination address and a source address to 4 bits, and the package insertion position is used as the address.

The message type indicates whether the first bit is a message to the control package (code 0) or a message from the control package (code 1), and the remaining hit positions are used to indicate communication data, control messages, etc. of the message type. indicate. Channel numbers are also assigned to 4 bits each for the destination and source. For the 8 bits of the final code, 4 bits for redundancy check are arranged before the 4 bits of the final code 101O.

The destination address and the source address are each formed by one octet of 8 bits in large scale switching equipment.

A channel number is assigned to a line connected to each package, and the format of information exchanged with the control unit of each package is channel CHO.

For example, the data has a fixed data length in the case of dialogue voice, and in the case of packets, it is formed in a packet format according to the CCITT recommendations.

Next, the operating procedure of the present invention will be explained with reference to FIG. First, the control package 11 that has been instructed to initialize sequentially inquires about the destination address starting from the first number and learns the type of package installed.

Therefore, since the control package 11 records that the package address number 2 is the extension package 12, for example, it is possible to know which signaling system and which program to call just from the address number.

Here, the operation procedure when a call arrives from one of the outside lines to the extension line will be explained. External line package 13 from exchange 30
(for example, address number 3) channel I (CH
When there is an incoming call to I), the outside line package 13 sends an incoming call request message to the channel CHO of the control package 11 (for example, address number 1). The control package 11 selects a predetermined extension package 1 according to the incoming call request.
An incoming call procedure is executed to transmit a paging signal to channels CHI to CH-. When there is a response from one of the extensions 21, a response message indicating that there is a response is sent from channel CH1 of extension package 12 to channel CHO of control package 11. The outside line package 13 transmits communication data from the channel CHI onto the high-speed transmission line 14 in a format in which the channel CHI of the extension package 12 is formed into a destination address and a destination channel number, respectively.

Since the transmission format on the high-speed transmission line 14 goes around once,
The H/W interface section 45 of the control package 11 counts the number of transmission formats to be sent out, increments it one by one, and uses it as a count value of the formats.

FIG. 4 is a block diagram showing an example of data transmission on a high-speed transmission path. As shown in FIG. 4, the IOMbps high-speed transmission path transmits codes at 10 microbits per second. C.C.I.
Forming the format for each channel type in the TT Recommendation I series, the format of the B channel (64 bits) is 8 octets, and the (23 B + D) channel (1544 bits) of the primary group B channel ink face structure.
The format is 193 octets, allowing for a certain amount of time delay, which is 64Kbps for a telephone call.
It also becomes possible to transmit s by packetization.

FIG. 5 is a configuration diagram showing an example of a format for transmitting multiple data using one transmission format. In FIG. 5, a plurality of channel data following the start code/address are connected by the end code. Each channel data is composed of "message type, channel number, and data" shown in FIG.

Therefore, this one transmission format is a case where the source and destination addresses, that is, the packages have the same source and destination, respectively. If the format of each channel data includes a destination address and only one source address, it is possible to execute a procedure for sequentially transmitting all data from one package. Generally, the data lengths are different, so the data length is encoded and added to the beginning of the data.

Although the present embodiment has been described with reference to a key telephone device, the present invention is applicable not only to telephones but also to guidance devices and time division switching devices connected to an exchange through an outside line.

Although this embodiment has been described by illustrating examples of transmission formats in FIGS. 3 to 5, the predetermined positions are not limited by the above explanation, except for the start code and end code positions.

The code 1010 included in the start code and the end code shown and explained in FIG. It can also make identification easier.

In Section 4, it has been illustrated and explained that a transmission formant is created by grouping each channel in units of one second, but the present invention is not limited to this explanation. Also, although there is no explanation of the connections between multiple channel data to be transmitted in Fig. 5, for example, C
It can be identified by including data length information at the head of the CITT Recommendation X.

Although one control package is shown in the figure, there may be two control packages, one for regular use/spare or one for current/spare, and the number is not limited. Although the internal line package and the external line package have been illustrated and explained separately, a mixed package of internal lines and external lines may be created by adding the line type to the format. Types of accommodation lines include public network exchanges, private lines with in-house exchanges, computer lines with personal computers, and the like.

〔Effect of the invention〕

As explained above, in the time division switching device of the present invention, at least one package accommodating a line and a control package are connected by one high-speed transmission line to form a ring, and sequentially transmit data in the form of packets. By configuring
This eliminates the need for input data from one line to be output in reverse order, and has the effect of eliminating the need for special phase adjustment.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the time division switching device of the present invention, FIG. 2 is a block diagram showing an example of partial details of FIG. 1, and FIG. 3 is transmission on the high-speed transmission path of FIG. 1. FIG. 4 is a block diagram showing an example of the code format; FIG. 4 is a block diagram showing an example of the data content in FIG. 3; FIG. 5 is a block diagram showing an example of a format different from that in FIG. 3; FIG. 7 is a block diagram showing an example of the conventional method, and FIG. 7 is a time chart showing an example of the switch status of the communication transmission line according to FIG. 10...Button telephone device (time division switching device),
11... Control package, 12... Extension package, 13... External line package, 14...
・High-speed transmission line, 40...Cart package.

Claims (1)

[Claims] 1. A plurality of extension lines terminated at a terminal and at least one outside line terminated at an exchange are accommodated and connected in each of a plurality of packages, and the packages are connected by a transmission line using digital codes. User information and signals having a start code and an end code at the start and end positions, and an address and a channel number at predetermined positions following the start code, in a time division switching device that exchanges connections between extension lines and between extension lines. A time division switching device characterized by having means for transmitting and receiving at least one of the data transmission formats to and from the transmission path at a high speed of at least 10 Mbps. 2. The time division switching device according to claim 1, further comprising means for inserting a count value as a transmission sequence number for each format into a predetermined position of the transmission format according to claim 1. 3. At the data position of the transmission format according to claim 1,
2. The time division switching device according to claim 1, further comprising means for inserting an information channel according to the channel type and interface structure of the CCITT Recommendation I series. 4. The time division switching device according to claim 1, further comprising means for inserting a plurality of pieces of data having the same origin and destination address into one of the transmission formats according to claim 1.