JPS5836557B2 - Time division exchange method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a time division exchange system that simultaneously exchanges information from multiple types of terminals, and particularly relates to a time division exchange system that simultaneously exchanges information from multiple types of terminals. ) is related to a method of exchanging at the same time.

There is a potential demand for communication between the same subscribers using multiple types of terminal devices simultaneously.

In other words, while data communication or image communication is being carried out between two subscribers, during the communication (at the same time, there is a meeting using the telephone,
There may be times when you would like to consult.

In order to meet these demands, conventionally each terminal had to be accommodated in a separate network for communication.

In addition, one network (an example of accommodating multiple types of terminals and communicating between the same subscribers using multiple terminals) is a telephone network, a TEX network, and an NCU (network control unit; network control device). are known to connect to accommodate data terminals, but these are all connected to telephone or T
EX terminals and data terminals were used by physically switching between them.

FIG. 1 is a typical principle diagram when a conventional telephone network is used to accommodate telephone terminals and data terminals.

In FIG. Switching contacts are shown.

Normally, a telephone circuit TEL is connected to the line, and by dialing the number of the called party on the telephone circuit TEL, a communication path is set up using normal exchange operations, and after a meeting with the called party,
NCU? Operate the provided button to switch contact r and connect the line to the data terminal device side σ.

Thereafter, data communication is performed via the previously set communication path.

The protection circuit P in the NCU is a circuit for preventing the transmission of excessive signals, out-of-band frequencies, etc. from the data terminal device side.

In this conventional method, the telephone terminal and the data terminal cannot be used at the same time, so if you want to discuss or confirm the data being sent or received, you need to operate the switching contact once after the data has been sent and received. There was the inconvenience of having to switch to the other party and then conduct meetings and confirmations on the telephone terminal.

The present invention solves this drawback by providing a digital switching system that transmits and exchanges data in block units (by clicking this button, one part of the block is used for information transfer from a telephone terminal, and the other part is used for other types of terminals (facsimile terminals, facsimile terminals, etc.). By using it for information transfer from data terminals (including image terminals), it is possible for the same subscriber to communicate using different types of terminals at the same time.

In other words, information from the telephone terminal and the data terminal is exchanged in a time-division exchange system in which information is exchanged in a time-division manner between subscribers who have installed a telephone terminal and a data terminal on the same subscriber line. A terminal multiplexing device is provided that multiplexes information in a time-division manner within one transmission block on a subscriber line, and exchange processing is performed in units of blocks, thereby simultaneously transmitting information from telephone terminals and data terminals. This allows communication between people.

FIG. 2 shows an embodiment of the subscriber line support unit for realizing the present invention, where TEL is a telephone terminal, IT is a relatively low-speed start-stop synchronous data terminal, and TMPX is a terminal multiplexing device related to the present invention. , LC is a line concentrator and multiplexer, SW is a switching center, and FIG. 3 shows the formats of the A, B, and C point buttons in FIG. 2 and each information signal inside the TMPX.

A in Figure 3 is voice information from the telephone terminal, and TMPX
(tC>, sampled at 8KHz, and further A'
8-bit encoding is performed as shown below.

On the other hand, B is data information sent from the DT, and is sampled at multiple points within the TMPX at a rate of <8 kb/s as shown in B'.

In the TMPX, the information of A' and the information of ``are combined into one block (BL) as shown in C and sent out over the subscriber line.

On C, 8-bit audio information (2) and 1-bit data information (D) are time-division multiplexed in one block (BL), and each block is given an A bit (1 bit) for block synchronization.

This A bit (TMPX, LC identifies the block position.

This A bit forms a repeating pattern of 010]...

Information from telephone terminals and information from data terminals
Each block of 10 bit length on the subscriber line is packed into 6 blocks by the MPX and transferred to the exchange.

At this time, the LC concentrates and multiplexes the data in block units on the high-speed link and transfers it to the switching center.

Conversely, the above block information sent from the exchange over the subscriber line is separated into telephone information and data information by the TMPX and sent to each terminal 6.

This data terminal information transfer section D is also used for controlling telephone terminals, as will be described later.

It is used to transfer on-hook and off-hook information of the telephone terminal to the telephone terminal, and to control the transmission of calling howler tones and the like to be transmitted from the telephone terminal to the telephone terminal.

FIG. 4 shows an embodiment of the communication path section of the time division switch SW, in which SW1 and SW2 are gate switches on the person side and the outgoing side, respectively, TSSI to TSSn are time slot converters,
t1 to tX indicate incoming lines, and m1 to my indicate outgoing lines.

The block multiplexed information from the human line via the LC in FIG.
It is exchanged at SW2 and sent to the desired outgoing line channel.

FIG. 5 shows channel #0 of line t1 in FIG.
#H=- and #23 are respectively assigned to channel #1 of line m2, channel #23 of line my, and line m.
y channel #1 is shown.

In this embodiment, one frame consists of 24 channels, and the information position on each line is expressed as a relative position with respect to the frame.

1/F represents frame synchronization bits.

Channel #0 on t1 transmits audio information V and data information D,
Channel #1 is carrying only data information D, and channel #23 is carrying only voice information ■. Ru.

FIG. 6 is an example of a block diagram of the terminal multiplexing device TMPX related to the present invention, where TEL is a telephone terminal, DT is a data terminal, INT is a data terminal interface section, LC is a line circuit, and HB is a two-wire circuit. 4-wire conversion circuit, LPF is a low-pass filter, TC is various tone sending parts, SG is a sampling gate, DEC is a decoder, CNT is a control circuit, COD is an encoder, SEP is a separation circuit, INS is an insertion circuit, SYN
is a clock extraction and block synchronization circuit, TIM is a timing generation circuit, U/B is a conversion circuit that converts a uni-bolar signal to a bi-bolar signal, B/U is a conversion circuit that converts a bi-bolar signal to a uni-bolar signal, CON is an INS,
A connection circuit between SEP and INT is shown.

When sending information from the terminal side, audio information is LC-HB
-LPF-SG-COD, it is sampled at 8 KHz, then encoded in 8 bits, and packed into V bits in the block in 8-bit units at INSσ.

The data information from the DT sampled at 8 kb/s at the INT, or the control information for the telephone terminal from the CNT, is passed to the INSG and inserted into the D bit I in the block in units of 1 bit.

CON, which connects INS$-, SEP, and DT, is controlled by CNT as described below.

Press the INS button and then press 0101 for each book...
. . . One A bit is assigned so as to form a repeating pattern, and the signal is sent to the subscriber line (F line) via U/B.

Information received from subscriber line (B line) is sent to SE via B/U.
P is separated into V bit and D bit, and V bit is DEC-
Transferred to the telephone terminal via LPF-HB-LC.

The D bit is CNT and the constant reception is monitored and at the same time G is input.
If T is connected with CON, IN through CON.
It is received at T, where the original data information G is restored and D'l
l is sent.

In the switched SYN, the receiver extracts the clock from the information and performs block synchronization, and in the TIM, based on that information, various timing signals required within the TMPX are generated and supplied to 6 such as INT and SG.

Next, the call setting method will be explained in relation to the method of using the D bit and the CON connection control method.

(a) The empty state CON is in the disconnected state, and the D bit is pulled in only by CNT.

From the CNT, the D bit of the F line is always at
A II Q If pattern (space) is sent,
Att II is also sent as the D bit of the B line from the first switching center.
o II pattern is being received.

(b) When the call is made: (i) When the CNT detects off-hook of the TEL, it sends a notification to the switching center by placing a pattern of all "O" (7-k) on the D bit of the F line.

At the same time, CON is controlled by CNT to connect the DT side.

(11) Is the D bit of the F line ail “0” at the exchange?
When it changes to aAtII I It, a call is detected.

(iiD When detecting the bit pattern of D bits l-0101... on the B line, CNTt/'iTC is driven by 1 and a dial tone is sent out.

(In INT, this bit pattern is ignored.) Dial information (PB) from +IVIITEL is sent out on the V bit of the F line in the same way as voice information.

When the connection with the other party terminal is confirmed by MTEL, communication is started using TELt or DT.

(c) When receiving a call (1) The D bit of the B line from the switching center changes from all"0 to a
ll "1" //When this changes, the CNT drives the TC and sends a calling tone to the TEL.

(ii) When the CNT detects TEL off-hook, it sends a11"]." to the station using the D bit of the F line.

At the same time, the CNT controls the CON to connect the DT side to the subscriber line.

(d) At disconnection (i) When CNT detects TEL on-hook, CON
is controlled to disconnect the DT side from the subscriber line, and transmits the aA7 II O II pattern using the D bit of the F line.

(i1) When the exchange detects continuous II-II on the D bit of the F line for a certain timing or more, it is regarded as terminal disconnection and the process proceeds to disconnection processing.

As described above, according to the present invention, it is possible to communicate by simultaneously using telephone terminals and data terminals accommodated in one network, and it is possible to carry out meetings and correlations related to real-time transmission and reception of data. This eliminates the inconvenience of having to switch between the two terminals instead of pressing a button one by one.

Furthermore, compared to accommodating each terminal in a separate network, it is possible to integrate the networks, and a path can be set for both terminals at the same time with one switching, which has the advantage of reducing the processing load.

When at least one telephone terminal is connected, a control bit is required to control the telephone terminal (for controlling the sending of call tones and howler tones), but this control bit is not used in the data transfer phase. If the bit is used for information transfer between terminals of other types, the present invention can be carried out without the need to provide a special bit for transferring information between terminals of other types.

It should be noted that the data terminals may also include facsimile terminals and image terminals.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of the connection between a telephone terminal and a data terminal in a conventional telephone network, FIG. 2 is an example of a block diagram of a subscriber line corresponding section in the present invention, and FIG. A diagram showing the information format of each part, FIG. 4 is an embodiment of the communication path section of the exchange in the sixth embodiment of the present invention, FIG. 5 is a schematic diagram of the switching process that is similar to FIG. 4, and FIG. 1 is an example of a block diagram of a terminal multiplexing device for the purpose of the present invention. ■ indicates voice information, D indicates data information, TMPX indicates a terminal multiplexing device, INS indicates an insertion circuit, and SEP indicates a separation circuit.

Claims (1)

[Scope of Claims] 1. In a time-division exchange system in which information is exchanged in a time-division manner between subscribers who have a telephone terminal and a data terminal device installed in the same subscriber line, the telephone terminal and the data terminal device A terminal multiplexing device is provided which multiplexes information from the network into one transmission block on the subscriber line in a time division manner, and the terminal multiplexing device multiplexes specific bits in the transmission block on the subscriber line during the call setup phase. The Q is used for transmitting control signals of the telephone terminals at the 6th stage, and the QQ is used for transmitting information from other terminals accommodated in the terminal multiplexing equipment at the data transfer face 6, and the communication path of the time division switch. A time division exchange system characterized in that, in the department, two types of information from the telephone terminal and the data terminal device are exchanged as one exchange unit. 2 In the time-sharing exchange method described in claim 1,
A time division switching system characterized in that the terminal multiplexing device detects the on-hook or off-hook state of the telephone terminal, and controls the connection of the data terminal to the subscriber line based on the detected state.