JPS6340519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal control system, more specifically,
The present invention relates to a signal control system in which a non-call signal such as a supervisory signal control signal corresponding to a call channel is switched together with a call signal of the corresponding channel in a time division switch.

In a time-division switch, switching of non-speech signals is generally not performed in the time-division channel network, and when trying to output a non-speech signal that is input from a certain line to a desired line, it is necessary to Signals were relayed by software without going through divided communication channels. However, this had the drawback of placing a large burden on the processing equipment and software of the exchange.

In addition, the communication path of the time division switch is
8 bits of PCM data, N bits for non-call signal and 1 parity bit, total 8+N
Some devices have a configuration that allows transmission of +1 bit, allowing non-call signals to be switched together with call signals, but this requires increased call path memory, requires a dedicated signal line for non-call signals, and slows down the signal transmission speed. Considering this, this method had the disadvantage of being uneconomical.

The present invention eliminates the above-mentioned conventional drawbacks, reduces the burden on processing equipment and software in a time division switch, reduces the amount of increase in call path memory and the amount of other additional hardware, and furthermore, This also enables switching of non-call signals, and allows non-call signals to be transmitted from line to line to be transmitted via communication channels set between the lines. The purpose of the present invention is to economically provide a signal control system that can check the following.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a connection diagram of an embodiment of the present invention. In the figure, TSWF ₁ ~TSWF _o are forward time switches, SSW is a spatial switch, and TSWB ₁ ~
TSWB _o is a backward time switch and T
- It constitutes a time-division communication channel network with an ST configuration.
In the figure, the forward time switch TSWF _o
Although the configuration and related devices of the forward and backward time switches TSWB _o are shown in some detail, the other forward and backward time switches are similarly configured. DL is a transmission line that carries PCM 8-bit communication signals, and 8 bits are transmitted in parallel.
It is made up of book lines. SL is a transmission line that carries a 1-bit non-speech signal and consists of a single line. Each time switch's channel memory (SPMF,
SPMB, etc.) is configured to be able to store a total of 9 bits, including 8 bits of the call signal and 1 bit of the non-call signal, in one address.

Now, for example, if the incoming highway HWF _o accommodates a PCM terminal station, the 8-bit data of the call signal is serial-to-parallel converted, converted into parallel codes, and time-division multiplexed before being sent to the incoming call signal. It is input from the highway HWF _o to the forward time switch TSWF _o via eight transmission lines DL. On the other hand, the non-speech signal carried by the speech channel is separated by the PCM terminal equipment and input as signal A or B from input terminal A or B in synchronization with the time slot given to the speech channel. This signal is a signal indicating the on-hook or off-hook state of the telephone, other supervisory control signals, etc., and since the speed is not high, one bit of information is sufficient. As will be explained in detail later, this signal is selected by a selector SEL and is inputted to a forward time switch TSWF _o via a signal line SL in synchronization with the time slot given to the speech channel.

In addition, in the figure, PG indicates parity check.
This is a bit generation circuit that pulls in the speech signal on the incoming highway HWF _o , generates a parity check bit for the data of this speech signal, and inputs it to the forward time switch TSWF _o in synchronization with the speech signal through the selector SEL. do. This parity check bit is also 1 bit. As the non-call signal corresponding to the call signal, the above signals A,
There are three possible types: B and parity check bit.

The switching operation in the illustrated time-division communication network, that is, the setting of communication channels, is performed in a known manner. That is, for example, incoming highway HWF _o
The speech signal carried over the transmission line DL by a certain time slot is written to the speech path memory SPMF of the forward time switch _TSWF0 together with the data on the signal line SL. This write address changes the output of time slot counter TS-CTR to address selector A in the write cycle.
Given by SEL F selection. Furthermore, in a predetermined time slot, the contents of the holding memory HM are read out, and in the read cycle, the address selector A SEL F selects this and sets it as the read address in the speech path memory SPMF.
given to. The speech signal and non-speech signal read in this predetermined time slot are read out to a predetermined highway in the space switch SSW, and sent to the backward time switch TSWB ₁ to
Enter one of the TSWB _o . In the backward time switch as well, the time slots are exchanged in the same way as in the forward time switch, and output is made to a predetermined time slot of one of the outgoing highways HWB ₁ to HWB _o .

In this embodiment, any one of the three types of signals, the two types of signals A and B mentioned above and the parity check bit, is switched together with the corresponding call signal.

For this reason, each of the three types of non-speech signals is placed on a time slot synchronized with the time slot carrying the corresponding speech signal, and is input to the forward time switch via the selector SEL as a multi-frame configuration. FIG. 2 shows an example of a multi-frame configuration that can be used in this embodiment, and as shown in the figure, 12 frames (F ₀ to F ₁₁ ) are used.
constitute one multi-frame MF. Each frame and the time slots within each frame are synchronized with that of the speech signal. Parity check bits are then assigned to frames F ₀ -F ₃ , signal A is assigned to frames F ₄ -F ₇ , and signal B is assigned to frames F ₈ -F ₁₁ .

In the figure, MF-CTL is a multi-frame timing control circuit that performs control to designate the timing for each frame in the multi-frame configured as shown in FIG. 2 and the time slot in each frame.

Now, as shown in Figure 2, multi-frame
If the timing for transmitting the parity check bit as a non-communication signal is assigned to frames F ₀ to _{F 3 in} MF, the multiframe timing control circuit _MF -CTL Selector SEL is controlled by the output of
The parity check bit PB sent from the bit generator PG is selected and sent to the signal line SL. That is, in frames F ₀ to F ₃ , one time slot of the frame allows
The 8-bit data carried via the 8 transmission lines DL of the input highway HWF _o is sent to the forward time switch TSWF _o in the same time slot along with the parity check bit PB sent via the signal line SL. input. As part of the exchange process, the speech and non-call data carried in this time slot are both switched to different time slots and output from the forward time switch TSWF _o , and are switched on the highway by the space switch SSW to be transferred to the backward time slot. time switch
Enter any of TSWB ₁ to TSWB _o , and then
The time slots are exchanged and output to the output highway (one of HWB ₁ to HWB _o ) corresponding to the backward time switch.

Now, turn on the forward time switch above.
The data carried by a certain time slot entered into TSWF _o is sent to the backward time switch.
Assume that exchange processing is performed to output to TSWB _o . and forward time switch
The data input to TSWF _o by time slot TS _i (9-bit data consisting of 8-bit call data and 1-bit parity check bit) is
It is assumed that the signal is output according to the time slot TS _k , and is further output from the backward time switch TSWB _o to the outgoing highway HWB _o according to the time slot TS ₀ . As is well known, this time slot allocation is performed by a central control unit (not shown) by writing this information into the holding memory HM.

Multi-frame timing control circuit MF-
The CTL receives the above information from the central controller and, based on this information, converts each time slot input to the forward time switch TSWF _o during the period from frame F ₀ to frame F ₃ into the time slot converted by the above switch. Parity checks are performed by applying synchronized signals to parity check circuits _PC1 and _PC2 to operate them. Furthermore, the parity check circuit _PC3 is similarly controlled at the corresponding timing to perform a parity check.

As mentioned above, for data to be input to forward time switch TSWF _o at time slot TS _i , the above switch is
To output according to TS _k , the corresponding time slot
At TS _k , the above forward time switch
At the output of TSWF _o and at the output of the spatial switch, a parity check is carried out in parity check circuits PC ₁ and PC ₂ , respectively, and the above data is also applied to the backward time switch TSWB _o in time slot TS ₀ . In order to output, in this output section, time slot TS ₀
At this point, the parity check circuit _PC3 performs a parity check.

In this case, the main focus is on checking whether the equipment and circuits that transmit the above-mentioned call data are normal, rather than checking whether the call data has been transmitted correctly.

Signals A and B corresponding to each speech channel, separated by the PCM terminal equipment, are input to the selector SEL in synchronization with the time slot and frame carrying the speech signal input to the incoming highway HWF _o .

Multiframe timing control circuit MF―
The CTL sends a control signal to the selector SEL at the input timing of frames F ₄ to F ₇ assigned to the signal A, selects the signal A, and outputs the signal A to the signal line SL. Therefore, for example, for 8 bits of call data carried via 8 transmission lines DL in time slot TS _i , 1 bit representing signal A sent corresponding to the above call data is transferred to signal line A. The call data 8 is then carried along the same time slot TS _i as above.
Forward time switch with bit
Enter TSWF _o . This data is exchanged and, as described above, is inserted into the time slot at the output of the backward time switch TSWB _o , for example.
Output according to TS ₀ .

At the output of the backward time switch TSWB _o , the 8-bit call data is output to the outgoing highway HWB _o via 8 transmission lines DL, and the signal A is output to the signal line SL, and both are in the same time slot TS. Output at ₀ . In addition
TSL _a is a multi-frame timing control circuit
This is a time slot designation signal line that specifies the time slot timing of signal A from MF-CTL, and connects the output terminal Aout of signal A with the output line of signal A branched from the signal line SL output from backward time switch TSWB _o . Configure. The time slot designation signal line _TSLa has a signal at the time slot corresponding to the time slot input to the forward time switch (for example, time slot TS ₀ for time slot TS _i ) in frames F ₄ to F ₇ . is sent, and at the time slot specified by this signal, a signal branching from the signal line SL becomes the signal A corresponding to the time slot (i.e., the speech channel).
is specified.

Now, assuming that the output highway HWB _o is connected to the PCM terminal equipment, the output terminal of the above signal A
Aout is guided to the above PCM terminal equipment, and thereby,
The non-call signal (signal A) corresponding to each call channel input to the PCM terminal equipment connected to the forward time switch TSWF _o is time-divided to the PCM terminal equipment connected to the backward time switch TS-WB _o . It is transmitted via a communication channel set in the exchange and can be further relayed to other stations.

Similarly to signal A, signal B can also be transmitted from the input end to the output end of the illustrated exchange via the communication channel set in the time division exchange. In this case, of course, signal B is not assigned to frames _F4 to _F7 , but is assigned to other frames, that is, frame _F8 .
~ Assigned to frame F ₁₁ , the signal B is generated by the time slot designation signal line TSL _b , which indicates the time slot where the signal B is present, of the multi-frame timing control circuit MF-CTL, and another branch line of the signal line SL. Configure the output terminal Bout.

When a telephone is housed in an illustrated exchange, as is well known, the line from the telephone is converted into 2-wire and 4-wire in the subscriber line circuit, and the outgoing signal from the telephone is encoded. It is multiplexed together with the encoded transmission signal by a multiplexing circuit and input to the incoming highway. On the other hand, non-call signals from the telephone, such as signals indicating the telephone's on-hook, off-hook status, control signals, etc., are separated in the subscriber line circuit as signals A and B, and these signals are transmitted to many other telephones. With similar signals from
The signals A and B are multiplexed separately on the time slots corresponding to the call signals, and are input into the selector (SEL) shown in FIG. 1 as a multi-frame configuration.

In addition, when connecting a telephone to the outgoing highway, the output of the outgoing highway is separated by a demultiplexer and sent to each telephone via the subscriber line circuit, and the signals at the signal output terminals Aout and Bout are also connected to separate devices. The signal is separated by a multiplexer and sent to the subscriber line circuit of the corresponding telephone set for predetermined monitoring or control.

The present invention is not limited to the above embodiments, and various modifications can be made within the technical scope.

The present invention is configured as described above, and transmits non-call signals such as signals indicating the on-hook and off-hook states of the telephone, signals indicating the line status, and other supervisory control signals together with the call signals to a call channel. It becomes possible to transmit the signal within the time-division communication network via the time-division communication network, and in this case, there is no need for the above-mentioned non-communication signal to bypass the time-division communication network, and therefore the burden on the processing equipment and software required for this is small. There is an effect. In addition, for example, it is possible to use a parity check bit as one of the above-mentioned non-call signals, so it is possible to easily check whether the time-division communication path network is normal or not using the parity check. There is a certain effect. This has the advantage that the invention can be implemented economically since the amount of hardware that must be added to the time division communication network is small.

[Brief explanation of drawings]

FIG. 1 is a connection diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a multiframe structure for a non-speech signal used in the above embodiment. HWF ₁ to HWF _o ...Incoming highway, DL...8 transmission lines for speech signals, SL...Non-speech signal transmission lines, TSWF ₁ to TSWF _o ...Forward time switch, SPMF, SPMB...Talking path memory,
SSW……Space switch, TSWB ₁ ~TSWB _o ……
Backward time switch, HWB ₁ ~ HWB _o …
...Outbound highway, TS-CTR...Time slot counter, HM...Holding memory, SEL...Selector, MF-CTL...Multi-frame timing control circuit, PG...Parity check bit generation circuit, PC ₁ , PC ₂ , PC ₃ ... Parity
Check circuit.

Claims (1)

[Claims] 1. In a time-division exchange that exchanges speech signals with a plurality of non-speech signals for each speech channel, the speech path memory of the time switch of the time-division exchange further contains speech signals as well as speech signals encoded in each address. is configured to store one of a plurality of non-speech signals corresponding to a multi-frame signal, and each of the plurality of non-speech signals is placed in a time slot synchronized with a time slot carrying a corresponding speech signal to be stored in a multi-frame frame. The configuration is such that different frames of the multi-frame are assigned to each of the plurality of non-call signals, and in the multi-frame, the plurality of non-call signals corresponding to the call channel are sequentially assigned one by one together with the corresponding call signal. A signal control system characterized in that the non-call signal is inputted to the time division exchange in the time slot of 1, and the non-call signal is switched together with the call signal corresponding to the non-call signal.