KR20040022505A - Apparatus for cooperating with private branch exchange in integrated access device - Google Patents

Abstract

PURPOSE: An interworking device with a PBX in an IAD(Integrated Access Device) is provided to directly connect PCM data to a highway of a PBX, and to replace an SPI(Serial Port Interface) for exchanging information between a DSP and a CODEC and a logic for exchanging information between the CODEC and an SLIC(Subscriber Line Interface Circuit), thereby interworking with the PBX. CONSTITUTION: A DSP(10) connects PCM-related data to a highway of a PBX, and controls SLIC information through an SPI. A CPLD(Complex Programmable Logic Device)(22) directly supplies the SLIC information given through the SPI from the DSP(10) to a private exchange. The CPLD(22) transmits the SLIC information through the SPI, reads a state of an SLIC, reflects a detected hook-off state on a state of the SLIC, and generates a ring signal. A TMC(Trunk Module Controller)(24) interfaces between the CPLD(22) and the private exchange.

Description

APAPATUS FOR COOPERATING WITH PRIVATE BRANCH EXCHANGE IN INTEGRATED ACCESS DEVICE}

The present invention relates to an integrated access device (IAD) in a wired communication system, and more particularly, to an interworking device of an IAD for interworking with a private exchange system such as a key phone system.

Typically, integrated access devices are equipped with high-performance access equipment that manages multiple modules for different data accesses, such as voice Asynchronous Transfer Mode (ATM) and frame relay, from a channel service unit with several Digital Subscriber Line (DSL) ports. In other words, there are many advantages in consolidating communication services, expanding bandwidth, and controlling the network by installing these IADs rather than using the total equipment provided by the telecommunications companies.

In particular, IAD, a type of Voice over DSL (VoDSL) equipment, supports voice and data communication simultaneously using Asymmetric DSL (ADSL), and at this time, voice call devices such as a telephone connected to a port that supports voice communication Transmitting and receiving is performed through digital processing of an analog voice signal using a digital signal processor (DSP) and a coder decoder (CODEC) for processing a voice inside the IAD.

This IAD transforms packet-based voice traffic through the IAD located in the subscriber's premises into the existing voice signal, which is the same as the existing telephone service receiving DSL data service and one or more telephone or fax services over the DSL service subscriber's premises. It has a matching function between the ATM network and the PSTN which performs the function of transferring to a public switched telephone network (PSTN) through a switch and vice versa.

Samsung IAD is a product that enables data and voice communication using ADSL interface, which supports VoDSL 2/4 port using Viirata CPU (Helium). It also supports 10 / 100-based Ethernet data ports. Referring to FIG. 1, the Samsung IAD transmits PCM data (PCMTX, PCMRX, FSX, PCMCLK) between a DSP (Magnesium) 10 and a codec T8536 12 to implement VoDSL. The codec 12 is controlled by the DSP 10 in order to exchange information with the subscriber line interface circuit (SLIC) L9215 and 14. In addition to FIG. 1, a CPLD 16 is provided around the DSP 10 to perform clock division and host port interface (HPI) related operations.

In order to control the codec 12 in the DSP 10, SPI (Serial Port Interface) communication is performed between the two. SPI consists of transmission clock (DCLK), chip select (CS: chip select), input data (DI: data in), and output data (DO: data out), and every 5ms when DSP 10 operates normally The CS and DCLK are generated. At this time, the DSP 10 and the CODEC 12 exchange information with each other. Here, the DSP 10 knows the state of each SLIC 14 through the data exchanged, and issues a command for changing the state of each SLIC 14 through the codec 12. Data out (DO) of SPI consists of 32 bits of serial data per channel, and transmission is transmitted in the order of 'command', 'address', 'length', and 'data' which consists of 8 bits.

The IAD configured as described above generally has a structure such as a codec 12 and a SLIC 14 for interworking with a digital subscriber line, which is a general telephone, but a private exchange system (for example, 'Samsung Key Phone System [DCS-828]'). ), The structure for interworking with) is not considered.

Accordingly, an object of the present invention is to provide an apparatus for interworking with a private exchange system such as a Samsung keyphone system (DCS-828) in an integrated access device.

The integrated access device according to the present invention should directly connect the PCM data transmitted from the DSP to the highway of the private exchange system for interworking with the private exchange system, and also transmit the information about the SLIC to the private exchange system directly. . In order to implement this, the SPI removes the conventional codec and SLIC and reconfigures the logic so that the SPI for exchanging information between the DSP and the codec and the logic for exchanging information between the codec and the SLIC can be linked to the private exchange system.

1 is a block diagram of an essential part for interworking with a subscriber general telephone in a conventional integrated access device;

2 is a block diagram illustrating main parts for interworking with a private exchange system in an integrated access device according to an embodiment of the present invention;

3 is an exemplary diagram of a signal waveform related to a serial port interface in a DSP for interworking with a general telephone / private switching system of an integrated access device.

4 is a diagram of a serial port interface output data structure in a DSP for interworking with a general telephone / private switching system of an integrated access device.

5 is an illustration of an associated signal waveform for a fast scan operation of a serial port interface in a DSP for interworking with a general telephone / private switching system of an integrated access device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

2 is a block diagram illustrating main parts for interworking with a private exchange system in an integrated access device according to an embodiment of the present invention. In FIG. 2, an apparatus for interworking with a private exchange, for example, a Samsung keyphone system (DCS-828), is disclosed in an IAD, for example, 'Samsung IAD', and in particular, to control serial port interface (SPI) communication. We propose a CPLD logic configuration. The configuration shown in FIG. 2 has a logic configuration using a new Complex Programmable Logic Device (CPLD) 22 instead of the codec 12 and the SLIC 14 as compared to the conventional configuration as shown in FIG. In this case, the CPLD 22 implements a hardware circuit between the conventional DSP 10 and the codec 12 using a VHDL (Very High Speed Integrated Circuit Hardware Description Language) program.

The Samsung IAD shown in FIG. 2 shows PCM-related data transmitted from the DSP for interworking with the private switching system (DCS-828), that is, PCM clock (PCMCLK), frame synchronization (FSX), transmission PDM (PCMTX), and reception PCM. (PCMRX) directly connects to the highway of the private exchange system. The CPLD implements the CPLD 22 to directly transmit information on the SLIC provided through the SPI (Serial Port Interface) to the private exchange system. SPI consists of transmission clock (DCLK), chip select (CS: chip select), input data (DI: data in), and output data (DO: data out), and every 5ms when DSP 10 operates normally The CS and DCLK are generated. Data out (DO) of the SPI is composed of 32-bit serial data per channel, as shown in Figures 3 and 4, the transmission is 'command', 'address', 'length', 'data' Are transmitted in order.

The CPLD 22 may be classified into three types. First, 32-bit data is transmitted through SPI, the part that reads the state of the SLIC, the second part that reflects the Hook-off Detect (DP) to the state of the SLIC, and the third ring signal generation (Ring) Signal generate: HOS) part.

For the SPI operation, start in the idle state (idle, 300)-> receive a command (rcv_cmd, 301)-> CS wait 1 (wait_cs_d1, 302)-> receive an address when the received command is not a fast scan (rcv_addr , Go to 303)-> CS wait 2 (wait_cs_d2, 304)-> Receive data field length (rcv_leigh, 306)-> CS wait 3 (wait_cs_d3, 307)-> Receive data field (data_st, 308)-> Idle state At 309, a state transition occurs. At this time, if the received command is the fast scan after the CS wait 1 302 state, the data field is immediately transitioned to the reception 308 state (see FIG. 5).

At this time, each state is counted to check the data input. Since the address and the length are always fixed to 8 bits and transmitted, the corresponding data is not latched. In the command receiving state 301, only the "COMMAND" part (mode setting) of bits 0 and 1 (mode setting) and the CKT select part (SLIC Select) part of bits 4 and 5 are detected and used among the received commands as shown in FIG. . Referring to FIG. 4, types of commands are classified into 'FAST SCAN MODE: 10', 'WRITE MEMORY 01', 'WRITE ALL MEMORY 11', and 'READ MEMORY 00'. In the data field reception (data_st, 308) state, data is input and a corresponding operation is performed for each command. In addition, the logic of the hook off detection state is configured in the data field reception state 308. Finally, the HOS (RING) signal sends a ring signal when the received data is ring enable, and disconnects the signal when the hook-off is detected.

An implementation example of such CPLD 22 may be a VHDL (Very High Speed Integrated Circuit Hardware Description Language) program as disclosed in <CPLD Program Source>. Referring to <CPLD Program Source>, when the reset is performed, the SPI transitions from the idle state to the command receive (rcv_cmd) state when the CS is enabled (low active) when the DCLK falls. * Command * part of the source program). In the command receiving (rcv_cmd) state, a count is used to wait for 8-bit data to be input when the DCLK rises. After the count is completed, the command reception (rcv_cmd) state checks whether or not a fast scan is performed. If the command is a fast scan (command = "10"), the next state is transferred to the data field reception (data_st) state. (The * Data Field * part of the program source below). This is to immediately lead the channel state in the next state. In this case, in the case of command = "10" in the data field reception state, the state of all channels is read by 2 bits. That is, once read, 8 bits are read, so it is possible to check whether the 4 channels are hooked off.

If the command is not in the fast scan mode, the command transitions to the next address reception (rcv_addr) state (* start Address * portion of the following program source). This state only waits using the count. After waiting, the transition to the next state, the data length reception state (rcv_length) state (the * Data Field length * portion of the program source) transitions to the state. This state also waits and transitions to the next state (data_st), which is the next state (* Data Field *). In this case, since a fixed value is always transmitted, data is not latched separately. In the next data field reception state, the input serial data is stored after shifting the data when DCLK rises (initiated as "wr_data (6 down 1)" in the following program source). After saving, if the command is write memory, that is, command = "01", the channel status is written to each channel according to the clock selection (ckt_sel) value when DCLK descends. If command = "11", all channels are written. Write the state.

Meanwhile, referring to the following program source, the HOS (RING) signal is generated when ba (5 downto 2) = " 0110 " and is generated until the DP (HOOK-OFF DETECT) signal is 1.

As such, the HOS signal of the CPLD 22 configured according to the present invention is provided to a trunk module controller (TMC: Trunk Module Controller 7053) 24, and the TMC 24 provides the DP signal to the CPLD 22. do. In the present invention, the TMC 24 is installed to provide an interface for the DSP 10 because the DSP 10 is not connected with a conventional general telephone terminal, but serves as a dial pulse generator time slot generator. Detect and output control functions. The TMC 24 exchanges the address BA and the data BSD with the private switching system DCS-828 and sends the HOS signal to the private switching system.

<CPLD Program Source>

As described above, the configuration and operation according to an embodiment of the present invention can be made. Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the embodiments described, but by the claims and equivalents thereof.

As described above, the integrated access device according to the present invention directly connects the PCM data transmitted from the DSP to the highway of the private exchange system, removes the conventional codec and the SLIC, and removes the DSP and the codec for interworking with the private exchange system. It is possible to work with private exchange system such as Samsung Key Phone System (DCS-828) by replacing SPI that exchanges information between SPI and logic that exchanges information between codec and SLIC with logic that can interoperate with private exchange system. Can be.

Claims (3)

In the interlocking device with the private exchange system in the integrated access device, A digital signal processor that directly connects PCM-related data to the highway of the private exchange system and controls SLIC (Subscriber Line Interface Circuit) information through the Serial Port Interface (SPI); And a complex programmable logic device (CPLD) for directly providing the SLIC information provided through the SPI to the private exchange in the digital signal processor. The CPLD of claim 1, wherein the CPLD transmits the SLIC information through the SPI, reads the state of the SLIC, reflects a hook-off detection to the state of the SLIC, and generates a ring signal. Interlocking device. The method of claim 1, And a trunk module controller for interfacing the CPLD and the private exchange period.