KR0186031B1 - T1 digital trunk interface and channel control method - Google Patents

Abstract

The present invention relates to a TI digital trunk interface device and a channel control method. More particularly, the present invention relates to a TI digital trunk interface device and a channel control method that can be integrated and connected to a highway and a TI line of a 32-channel switching system.

The TI interface device does not use TSW in the TI interface device, but connects a signal dedicated processing circuit to a signal bus of a TI interface dedicated circuit and the TI interface dedicated circuit to process a signal, and the data bus is a TSB of a PBX. Integrate the highway. The signal-only processing circuit is controlled in the connected state as described above to generate various signals and search processing of the received signals so as not to separately control the TI data bus. By configuring the TI digital trunk interface device as described above and controlling the channel, it is possible to facilitate the control of the signaling channel and the data channel.

Description

T-one digital trunk interface device and channel control method

1 is a block diagram of a conventional TI digital trunk interface device.

2 is a channel control flow chart of a conventional TI digital trunk interface device.

3 is a channel mapping of a channel and a TI line of a highway of a PBX and a mapping of ports and highways of a PBX.

4 is a block diagram of a TI digital trunk interface device in accordance with the present invention.

5 is a channel control flow diagram of a TI digital trunk interface device according to the present invention.

6 is a memory map according to the present invention.

The present invention relates to a TI digital trunk interface board (TI Digital Trunk Interface Board) and a channel control method, and in particular, a TI digital trunk interface device and a channel capable of integrated connection to a highway and a TI line of a 32-channel switching system. It relates to a control method.

In general, the TI digital trunk interface refers to a device that interfaces with transmission data of 1.544 Mbps of data output from a system transmitting data at 2.048 Mbps. For example, converting 32-channel PCM data into 24-channel data, outputting it to the TI transmission path, and performing the operation opposite to this.

Fully automatic private exchange (PBX) has a TI digital trunk interface device for connection with a TI-exchange local exchange or private exchange. Such a TI digital trunk interface allows the output of a time switch in a private switch with 32 channel highways to be connected to a 24 channel TI line.

FIG. 1 is a block diagram of a conventional TI digital trunk interface device. A call service is provided with a time switch (hereinafter referred to as “TSW”) 10 for switching signaling data and information data on a 32-channel highway. The TI interface 12 performing the PBX 12 and data input to the 32 channel data bus 20 by predetermined control data are converted into 24 channel data of TI and outputted, and the TI interface performing the inverse conversion operation thereof. (14) and between the 32 channel highway of the TSW 10 located in the private exchange 12 and the data input / output bus 20 and the signal bus 24 of the TI interface 14, The 32 channels of data input by the control are switched to the data of the TI transmission channel, and the TSW 16 outputting the signaling signal and the information data output from the PBX 12 are stored in the internal memory area. It is composed of a TI interface trunk 28 composed of MPUs 18 that control the TSW 16 with mapping data.

FIG. 2 is a flow chart of a channel control of a conventional TI digital trunk interface device. FIG. 2a is a flow chart of processing a signal channel by analyzing a message received from the PBX 12, and FIG. 2b is processing a signal by receiving a signal from a TI line. This is a flow chart.

FIG. 3a shows a channel mapping diagram between a 32 channel data bus and a TI line, and FIG. 3b shows a channel mapping diagram between a signal bus and a TI line, and FIG. 3c shows a mapping diagram of ports of the PBX with each channel of the 32 channel data bus. It is shown.

The mapping tables of FIGS. 3A, 3B, and 3C are stored in the memory area of the MPU 18 in the TI digital trunk interface 28 shown in FIG.

If the control message (CTL-M) is now output from the PBX 12 and the PCM data is output to the 32-channel highway of the TSW 10 therein, the MPU 18 returns the PBX 12 as shown in FIG. Analyze messages sent from In other words, it retrieves the message authorization that the control of the TSW 16 in the TI digital trunk interface 28 requires.

If the message requires the control of the TSW 16, the MPU 18 accesses the port number in the PBX 12 and the channel number of the TSW 16 matching the TSW 10 from the internal memory table. .

The MPU 18 then controls the TSW 16 by accessing the channel number of the 32 channel data bus 20 corresponding to the channel number of the accessed TSW 16 from the table of FIG. At this time, the TSW 16 switches and converts the 32-channel data output from the TSW 10 of the PBX 12 as shown in FIG.

The TI interface 14 converts and outputs data having a transmission rate of 2.048 Mbps into TI transmission data having a transmission rate of 1.544 bps.

As described above, the MPU 18 controlling the TSW 16 analyzes the message received from the PBX 12 and finds the channel number of the signal bus in the table shown in FIG. ). At this time, the signal receiving process from the TI line is as follows.

When data is transmitted from the TI line and the TI interface 14 outputs 32-channel data and signals to the 32-channel data bus 20 and the signal bus 24, they are input to the TSW 16.

At this time, the MPU 18 controls the TSW 16 at predetermined intervals to read the data of the signal channel input to the signal bus 24. As described above, when the MPU 18 that reads the signal input to the signal bus determines whether there is a change in the signal, the MPU 18 performs a job corresponding thereto, and then searches whether the message should be sent to the PBX 12. .

When the message needs to be sent to the PBX 12, the MPU 18 finds a port number corresponding to the corresponding signal channel number and transmits the message to the PBX 12.

The MPU 18 having performed the above operation searches for the necessity of controlling the TSW 16 located in the TI interface device. When the search result requires control of the TSW 10, the MPU 18 searches for a channel of the TSW 16 corresponding to the corresponding signal channel and then matches the corresponding port (mapped) in the TSW 10 in the PBX 12 (mapped). The TSW 16 is controlled by finding the channel number.

However, the conventional TI digital trunk interface device operated as described above uses the 32-channel data buses 20 and 22 and the signal bus 24 connected between the TSW 16 and the TI interface 14 to the TI line. It must be configured.

To do this, 32 channels of data between the TSW 10 in the PBX 12 and the TSW 16 in the TI digital trunk interface device 28 pass through the TSW 10 to fit the 24 channels of the TI line. Eight channels must be removed and the channels properly mapped internally. That is, the 24 channels used in the TSW 10 of the PBX 12 are rearranged so that each channel is equal to the third degree in the TSW 16 in the TI digital trunk interface device 28, and the channels are arranged on the data bus 20. Put it on. For this purpose, the MPU 18 must control the TSW 16. For this purpose, the MPU 18 must be provided with data and control program thereof as shown in FIG.

However, such a conventional circuit is complicated by the TI digital trunk interface 28 having the TSW 16, and the control program is difficult because the TSW 16 needs to be controlled. This is because the control of the time switch is generally complicated. In addition, when one digital trunk is connected to one TI line and the remaining unused highways of the TSW 16 become unnecessary parts when the digital trunk is connected to the TSW 10 of the PBX 12. Loss occurs.

Accordingly, an object of the present invention is to provide a TI digital trunk interface device and a channel control method for interfacing data by integrating a 32-channel highway of a PBX to a 24-channel TI line.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of a TI digital trunk interface device according to the present invention, having a TSW 10 for switching signaling data and information data on a 32-channel highway, and a FIFO 11 for transmitting and receiving messages. A private exchange (PBX) 12 that performs call service; It has a channel mapping table between 32 channel data and TI lines, and a mapping table between signal channels and TI lines, and analyzes the message output from the PBX 12 to output a signaling control signal and to input the TI signaling signal. An MPU 18 that analyzes and sends a message to the PBX 12, a PIP 32 connected between the PIPX 11 in the PBX 12 and the MPU 18, and interfacing the message; The TI interface 14 converts and transmits 32-channel data and 32-channel signaling signals of the TSW 10 of the PBX 12 into signals of the corresponding channel of the TI line by the signaling control signal and performs reverse operation thereof. And between the MPU 18 and the signaling bus 24 of the TI interface 14, and converts the signaling signal and the signaling control signal by the control of the MPU 18 into the TI interface 14; ) And exit from the TI interface 18 Wherein a signal which is composed of MPU (18) TI digital trunk interface device 28 consists of a signaling control circuit 30 for outputting a.

The TSW 10 in the PAX 12 configured as described above is used as a group of several TSWs according to the classification of the PBX 12, and the call or extension between each extension and the trunk and trunk extension lines are based on the TSW. The call is made. The TI digital trunk interface 28 is also a trunk as seen from the PBX 12 and has a highway of TSW connected to it.

The TSW 10 means one TSW connected to the corresponding TI digital trunk interface. The TSW 10 has several highways, and only one RX High Way and one TX High Way are connected to the TI digital trunk interface 28 to be connected to one TI line. It is done. At this time, each highway has 32 channels internally.

The pair of transmit and receive highways is coupled to TI interface 14 in TI digital trunk interface 28. In addition, the signal control circuit 30 of FIG. 4 is used to control various signals transmitted and received through the TI line, and the MPU 18 performs signal control by controlling the signal control circuit 30.

The data transmitted or received on the TI line includes voice, data, and signal, but the voice, data, and signal are separated by the TI interface 14.

In the above configuration, the TI interface 14 and the signal control circuit 30 may use MH89750 and MT8920 produced by the semiconductor manufacturer “MITEL”.

FIG. 5A is a channel control flowchart according to the present invention, which is a flowchart for controlling a signal upon receiving a message from the PBX 12, and the procedure is as follows.

A message retrieval process for retrieving whether a message is required by signaling control of a TI line upon reception of a message transmitted from the PBX 12, and when the message retrieval process determines that a message is required for signaling control to the corresponding port. It consists of a signaling control process that controls the signaling by finding the channel number of the mapped signal bus.

5B is a channel control flowchart according to the present invention, which is a flowchart of processing upon receiving signaling from a TI line. The procedure is as follows.

After checking all signal channels, it reads the signal channel on the signal bus and checks whether there is a signal change, and when a signal change is detected in the signal search process, it performs a corresponding service and sends a message to the PBX 12. It consists of a message transmission search process for searching whether there is an outgoing message in the message transmission search process, and a message transmission process for transmitting a message to a port number mapped to a channel number of a corresponding signal bus.

6 is a memory map diagram according to the present invention, which is stored in a memory area within the MPU 18.

The configuration consists of 40H (Hax) for each channel, of which 5 bytes are copied from a ROM to represent characteristics of each channel, and the remaining bytes are temporary memory areas. The order of the port number table is that of port number. Port type is partial data to distinguish whether the corresponding port is DID or DOD. Signal type is signal type designation data. The address of the signal channel is the actual address of the signal channel of the current port. After this data ROM has been created, it is copied to RAM during program initialization.

Hereinafter, the operation of FIG. 4 according to the present invention will be described in detail with reference to FIGS. 5A and 5B.

Now, when the PBX 12 outputs a message through the pico 11 and simultaneously transmits data to be transmitted to the highway via the TSW 10, the message and data are input to the MPU 18 through the pico 32. .

At this time, the MPU 18 searches whether the message received from the PBX 12 is a message that requires signal control as shown in FIG. 5A. When the message requires the control of the search result signal, the MPU 18 calculates the address of the port table using the port number included in the received message in FIG. 5A. If the port table address is +2, the memory containing the channel number on the signal bus of the port can be accessed. When a signal is written to a corresponding channel owned by the port number, the value is input to the signal control circuit 30.

The signal control circuit 30 loads the signal received from the MPU 18 in the channel mapped as shown in FIG. 3b and is transmitted to the TI interface 14. Since the above data is transmitted to a channel matched to a port of a specific highway (the corresponding TI interface trunk) of the TSW 10 of the PBX 12, the data interface 20 and the signal are transmitted at the TI interface 14. The data to be sent to the TI line with the bus 24 is extracted.

At this time, the channel of the channel data bus 20 is mapped to the TI line as shown in FIG. 3A, and the channel of the empty TI line is not used.

The relationship in which 24 channels of the 32-channel signal bus 24 are mapped to TI lines is shown in FIG. 3B. At this time, a channel of the empty TI line is not used, and some channels of the signal bus 20 mapped thereto are used as channels for controlling the TI interface 14.

On the other hand, the relationship between each trunk port of the PBX 12 and each channel of the TSW 10 is shown in FIG. 3C, and 20H ports use one highway. Each channel of FIG. 3c is matched with the data bus 20 as shown in FIG. 3a, and thus a trunk port matching a channel of a data bus not used in the TI line is not installed in the PBX 12. do.

By the above operation, eight of the 32 channels of the TSW 10 in the PBX 12 are not used by the PBX 12.

In this case, the channel number of the TSW 10 in the PBX 12 used by each trunk port and the channel number on the data bus 20 of the TI interface 14 correspond one to one. Accordingly, the channel number of the signal bus may also be mapped to the port number.

On the other hand, when the signal and data enters the TI line, the TI interface 14 separates the data and the signal and transmits the data to the TSW 10 in the PBX 12 and the signal to the signal control circuit 30.

At this time, the MPU 18 controls the signal control circuit 30 to read and process the received signal, and if there is a message to be transmitted to the PBX 12, the MPU 18 maps to the corresponding signal channel number in FIG. Find the port number and send the message. When the PBX 12 receives a message and needs control of the TSW 10, a path of data is connected by controlling a channel as shown in FIG. 3C.

As described above, the present invention can easily control channel control by eliminating the need for TSW control during seizure or release of ports by not using TSW in the TI interface device.

Claims (2)

Tee with a private switch (PBX) 12 performing call service with a TSW 10 for switching signaling data and PCM data to a 32 channel highway and a FIFO 11 for sending and receiving messages. In the original (TI) digital trunk interface device, it has a channel mapping table between 32 channel data and a TI line, and a mapping table between a signal channel and a TI line, and analyzes a message output from the PBX 12 to signal a control signal. Is output between the MPU 18, which transmits a message to the PBX 12 by analyzing the TI signaling signal, and is connected between the PPO 11 and the MPU 18 in the PBX 12. The PPO 32 interfacing the message, and the 32-channel data and the 32-channel signaling signal of the TSW 10 of the PBX 12 are converted into a signal of the corresponding channel of the TI line by a signaling control signal. TI interface to reverse its behavior A switch 14 is connected between the MPU 18 and the signaling bus 24 of the TI interface 14, and the signaling signal and the signaling control signal controlled by the MPU 18 are controlled. A TI digital trunk interface device 28 composed of a signaling control circuit 30 for outputting to the TI interface 14 and outputting the signal output from the TI interface 18 to the MPU 18. Characterized by a circuit. A private exchange (PBX) 12 performing call service with a TSW 10 for switching signaling data and PCM data to a 32-channel highway and a FIFO 11 for transmitting and receiving messages; It has a channel mapping table between 32 channel data and TI lines, and a mapping table between signal channels and TI lines, and analyzes the message output from the PBX 12 to output a signaling control signal and to input the TI signaling signal. An MPU 18 for analyzing a message and transmitting a message to the PBX 12, a PIP 32 connected between the PPO 11 and the MPU 18 in the PBX 12, and interfacing the message; The TI interface 14 converts and transmits 32 channel data and 32 channel signaling signals of the TSW 10 of the PBX 12 into signals of the corresponding channel of the TI line by signaling control signals and performs reverse operation thereof. ) And a signaling bus 24 of the MPU 18 and the TI interface 14, and a signaling signal and a signaling control signal controlled by the MPU 18 are connected to the TI interface (A). 14) and exit from the TI interface 18. T-one digital trunk interface device having a TI interface device 28 composed of a TI digital trunk interface device 28 composed of a signaling control circuit 30 for outputting the output signal to the MPU 18. In the channel control method of the present invention, a message retrieval process for retrieving whether a message is transmitted from the PBX (12) and receiving a message is required for signaling control of a TI line, and signaling control is required during the message retrieval process. Signaling control process to control the signaling by finding the channel number of the signal bus mapped to the corresponding port when it is determined to And if there is a message to be sent to the PBX 12 after performing a corresponding service when detecting a signal change in the signal searching process; Characterized in constituted by any of the message transmission procedure for transmitting a message to a port number that is mapped to the channel number for determining when the bus signal that is transmitting the message from the message transmission and retrieval process, the message sent search process of searching.