KR20040056482A - An apparatus and method for a selective utopia level-1 interface in asynchronous transfer mode system - Google Patents

Abstract

PURPOSE: A selective UTOPIA(Universal Test operations PHY Interface for ATM) level 1 matching apparatus in an ATM system, and an implementing method thereof are provided to select one physical layer device and match it with an ATM layer device to thereby implement them with a simple structure at a low cost. CONSTITUTION: An ATM layer(10) includes devices handling segmentation and assembly of ATM cells. The first physical layer(30) is matched with a UTOPIA level 1 and transmits data at the first speed to an optical cable. The second physical layer(40) is matched with the UTOPIA level 1 and transmits data at the second speed to a twist pair cable. A physical layer selector(20) selects one physical layer according to a physical layer select signal received from the outside, and matches the selected physical layer with the ATM layer(10).

Description

Selective Utopia Level 1 Matching Device in Asynchronous Transfer Mode System and Its Implementation Method {AN APPARATUS AND METHOD FOR A SELECTIVE UTOPIA LEVEL-1 INTERFACE IN ASYNCHRONOUS TRANSFER MODE SYSTEM}

The present invention relates to a utopia level 1 matching device and an implementation method thereof, and more particularly, to an optional utopia level 1 matching device in an asynchronous transmission mode system for selecting and matching one physical layer unit.

Asynchronous Transfer Mode (ATM) refers to ATM Adaptation Layer (AAL), which performs convergence and cell segmentation and reassembly (SAR), and general flow control and cell VPI / VCI (Virtual Path). Identifier / Virtual Circuit Identifier (hereinafter referred to as VPI / VCI) is divided into ATM layer that is in charge of transformation and physical layer that performs functions related to various physical layers.

Among these, in order to easily adopt various transmission media, a common interface standard method for matching between the physical layer and the ATM layer is defined. This is the UTOPIA (Universal Test operations PHY Interface for ATM, hereinafter UTOPIA) protocol defined by the ATM Forum. Interface).

In detail, the Utopia interface has Level 1, Level 2, Level 3, and Level 4, which can be used appropriately depending on the application. The higher the level, the higher the transmission speed.

Of these, Utopia Level 1 features are based on 8-bit data transmission, and the biggest difference from other levels is that it can have only one physical layer device. That is, a level 2 or higher utopia interface may have two or more physical layer devices (level 2) or two or more physical layer ports (levels 3 and 4), but level 1 may have only one physical layer device.

Therefore, when implementing two or more physical layer interfaces using the Utopia level 1 physical layer device, it is inconvenient to implement each physical layer as a module and use it as a necessary interface. In addition, there is a disadvantage in that a separate matching circuit such as a multiplexing / demultiplexing circuit or a bus switch is required.

To eliminate this drawback, you can use Utopia Level 2, which can be matched to multiple physical layer devices rather than Utopia Level 1, but this adds the burden of using Utopia Level 2 physical layer devices, which are relatively more expensive than Utopia Level 1. Increasing number of wires, timing loss during level 2 address polling, and the need for complex matching logic between level 2 and level 1 compared to when the required physical layer device only supports level 1. have.

As a technology related to such a utopia level, the right holder has a patent of Hyundai Electronics Co., Ltd. [Patent name: ATM STB device that can support multiple physical layers, registration number: 10-1999-000728]. In order to support various physical layer interfaces, it is possible to support various interfaces without replacing the physical layer cards by replacing the conventional physical layer and the ATM layer in a 1: 1 correspondence.

However, this method also has an additional cost burden in system implementation, and also has a disadvantage in that the structure is complicated.

Therefore, there is a demand for a matching device having low cost and simple structure, and an implementation method thereof.

The technical problem to be solved by the present invention is to solve this problem, by selecting one physical layer device of at least two or more physical layer devices to match with the ATM layer device, to implement a simple structure and low cost To provide an optional utopian level 1 matching device and a method of implementing the same in an asynchronous transmission mode system.

1 is a detailed internal configuration diagram of an optional utopia level 1 matching device in an asynchronous transmission mode system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an output value of the physical layer selector 20 illustrated in FIG. 1.

※ Explanation of code for main part of drawing ※

10: ATM layer 20: physical layer selection

30: first physical layer unit 40: second physical layer unit

In order to achieve the above object, the selective utopia level 1 matching device in the asynchronous transmission mode system according to the present invention is the utopia level 1 in the asynchronous transmission mode system that selects the physical layer interface using the UTOPIA INTERFACE level 1. A matching device, comprising: an AT layer consisting of a device (DEVICE) responsible for partitioning and assembling ATM cells; A first physical layer unit matched to UTOPIA LEVEL 1 and transmitting data at a first rate over an optical cable; A second physical layer unit matched to UTOPIA LEVEL 1 and transmitting data at a second rate to a twisted pair cable; And a physical layer selection unit configured to select one physical layer according to the received selection signal and then match the selected one physical layer with the ATM layer unit when a physical layer selection signal is received from the outside. do.

In addition, the selective utopia level 1 matching method in the asynchronous transmission mode system according to another aspect of the present invention, Utopia level 1 matching in the asynchronous transmission mode system to select the physical layer interface using the UTOPIA INTERFACE level 1 A method comprising: a) receiving a physical layer selection signal from an external source, in accordance with a required physical layer; b) selecting one physical layer by adjusting a utopia level 1 control signal according to the received selection signal; And c) matching the selected AT layer with the division and assembly of the ATM cell.

Further, according to another aspect of the present invention, a recording medium comprising a utopia level 1 matching method in an asynchronous transmission mode system for selecting a physical layer interface using a UTOPIA INTERFACE level 1 is provided. Receiving a physical layer selection signal from the outside according to the losing physical layer; b) selecting one physical layer by adjusting a utopia level 1 control signal according to the received selection signal; And c) a recording medium storing a program including a function of matching the selected one physical layer with an ATM layer responsible for partitioning and assembling an ATM cell.

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

1 is a detailed internal configuration diagram of an optional utopia level 1 matching device in an asynchronous transmission mode system according to an embodiment of the present invention.

First, referring to FIG. 1, the selective utopia level 1 matching device according to an embodiment of the present invention includes an AT layer 10, a physical layer selecting unit 20, and first and second physical layer units 30 and 40. The AT layer 10 and the first and second physical layer units 30 and 40 are connected by an 8-bit utopia bus, and the physical layer selector 20 provides a Clav signal and an Enb signal. The control selects one of the first and second physical layer units 30 and 40 according to the PhySel signal value.

In detail, the AT layer 10 transmits TXD [7: 0], TxSoc, and TxPrty signals, which are transmission signals in the UTOPIA standard, to the first and second physical layer units 30 and 40. , RxD [7: 0], RxSoc and RxPrty signals, which are reception signals in the Utopia standard shared by the first and second physical layer units 30 and 40, are received as inputs.

At this time, TxClk and RxClk signals, which are clock signals, are transmitted from the AT layer 10 to the first and second physical layer units 30 and 40 according to the Utopia standard.

Next, the physical layer selector 20 uses a PhySel signal determined according to a value determined by a user as an input value, and receives the TxClav1, RxClav1, TxClav2, and RxClav2 received from the first and second physical layer units 30 and 40. After receiving the signal, the TxClav and RxClav signal values are determined and transmitted to the AT layer 10 as shown in FIG.

Subsequently, the physical layer selector 20 receives the TxEnb and RxEnb signals from the AT layer 10 and is connected to the first and second physical layer units 30 and 40 according to the received signal values. TxEnb1, RxEnb1, TxEnb2, and RxEnb2 signal values are determined as shown in FIG. 2 and transmitted to the corresponding physical layer unit.

In particular, the ATM layer unit 10 according to an embodiment of the present invention is a device that is responsible for cell division and assembly in ATM transmission, and the first physical layer unit 30 is 155.52 Mbps STM-1 (Synchronous Transport Module). 1) a physical layer device for transmitting data at a rate, and the second physical layer unit 40 is a physical layer device for transmitting data at a rate of 25.6 Mbps over a twisted pair cable, and the physical layer selector 20 is a programmable logic device ( Programmable Logic Device (PLD).

The selective utopian level 1 matching device of such a configuration will be described in detail according to transmission and reception signals.

In the utopia interface, the data flow from the ATM layer to the physical layer is called transmission (Tx), and the flow of data from the physical layer to the ATM layer is called reception (Rx). The configuration of the present invention is described in more detail by dividing the transmission and reception signals as follows.

First, the operation process of the selective Utopia level 1 matching device based on the transmission signal will be described. As shown in FIG. 1, the TxD [7: 0], TxSoc, and TxPrty signals, which are transmitted signals, are the first and second physical layer units 30, In case of connection with 40), the unselected physical layer part should ignore the transmission signal value and ignore it, which can be adjusted as a TxEnb signal.

That is, the first and second physical layer units 30 and 40 sample the received TxD [7: 0], TxSoc, and TxPrty values only when the TxEnb signal is asserted, thereby allowing the first and second physical layer units 30 and 40 to sample. It is possible for the two physical layer units 30 and 40 to share transmission signals such as TxD [7: 0], TxSoc, and TxPrty signals.

To this end, in the embodiment of the present invention, the TxEnb signals output from the AT layer 10 are not directly transmitted to the first and second physical layer units 30 and 40. Instead, the TxEnb signal is received by the physical layer selector 20 and the value of the TxEnb signal is applied to the signal connected to the physical layer unit selected from among the TxEnb1 and TxEnb2 signals connected to the first and second physical layer units 30 and 40. And deassert a signal connected to a physical layer that is not selected among TxEnb1 and TxEnb2 signals.

Meanwhile, the TxClav signal, which is a signal indicating that the first and second physical layer units 30 and 40 can receive and transmit data from the AT layer 10, only has a signal output from the selected physical layer unit. have. Accordingly, the physical layer selector 20 receives the TxClav1 and TxClav2 signals and transfers only signals from the physical layer selected from the dual layer as the TxClav signal of the AT layer 10.

Next, referring to the signals related to the reception, as shown in FIG. 1, the RxD [7: 0], RxSoc, and RxPrty signals, which are received signals, are driven by the first and second physical layer units 30 and 40, and thus appropriate measures are taken. If not taken, a signal collision may occur. However, it can be adjusted as an RxEnb signal.

In detail, the first and second physical layer units 30 and 40 drive RxD [7: 0], RxSoc, and RxPrty signals, which are received signals only when the RxEnb signal is asserted, and RxD [when not asserted. 7: 0], and RxSoc and RxPrty signals are all maintained in a high impedance state, whereby signals can be transmitted to the AT layer 10 without collision.

To this end, in the exemplary embodiment of the present invention, the RxEnb signal received from the AT layer 10 is received as a physical layer selected from RxEnb1 and RxEnb2 signals connected to the first and second physical layer units 30 and 40, The RxEnb signal is transmitted to the connected signal as it is, and the signal connected to the physical layer part not selected from the RxEnb1 and RxEnb2 signals is deasserted.

The RxClav signal indicating that the AT layer unit 10 has data to be received from the first and second physical layer units 30 and 40 is meaningful only by the signal output from the selected physical layer unit.

Therefore, after receiving the RxClav1 and RxClav2 signals, the physical layer selector 20 transfers only the signals received from the physical layer unit selected as the RxClav signal of the AT layer 10.

A display example of such transmit and receive signals is shown in FIG.

FIG. 2 is a diagram illustrating each output signal value according to a PhySel signal applied to an input of the physical layer selector 20 illustrated in FIG. 1.

As shown in FIG. 2, when Desert as PhySel = 'Low', the first physical layer unit 30, which is a 155.52 Mbps interface, is selected, and when Assisted as Physel = 'High', the second physical layer is a 25.6 Mbps interface. Part 40 is selected.

As described above, the present invention of the above configuration provides a simple method of selectively using one of the 155.52 Mbps interface and the 25.6 Mbps interface despite using utopia Level 1 devices.

The drawings and detailed description of the invention are merely exemplary of the invention, which are used for the purpose of illustrating the invention only and are not intended to limit the scope of the invention as defined in the claims or in the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Selective Utopia Level 1 Matching Device and Implementation Method in the Asynchronous Transmission Mode System According to the Present Invention Selects one physical layer to easily adopt various transmission media, and then the ATM layer interface and Utopia level 1 By matching through the physical layer interface, it is possible to implement a simple structure and low cost.

Claims (11)

A utopia level 1 matching device in an asynchronous transmission mode system that selects a physical layer interface using UTOPIA INTERFACE level 1, An ATM layer unit including a device (DEVICE) that is responsible for partitioning and assembling ATM cells; A first physical layer unit matched to UTOPIA LEVEL 1 and transmitting data at a first rate over an optical cable; A second physical layer unit matched to UTOPIA LEVEL 1 and transmitting data at a second rate to a twisted pair cable; And When a physical layer selection signal is received from the outside, the physical layer selection unit selects one physical layer according to the received selection signal, and then matches the selected one physical layer with the ATM layer unit. Optional utopia level 1 matching device in the asynchronous transmission mode system comprising a. According to claim 1, The AT layer and the first and second physical layer, An optional utopia level 1 matching device in the asynchronous transmission mode system, characterized in that for sharing the data transmission and reception signal lines of the utopia level 1 control signal, respectively. The method of claim 3, wherein The physical layer selector, And an utopia level 1 matching device in the asynchronous transmission mode system, characterized in that the signal transmitted from the AT layer is normally received only by the selected physical layer through the shared data transmission signal line. The method of claim 3, wherein The physical layer selector, And a selective utopian level 1 matching device in the asynchronous transmission mode system, characterized in that the first and second physical layer units receive the signals received from the first and second physical layer units via the shared data reception signal line so as not to collide with each other. According to claim 1, The physical layer selector, Selective utopia level 1 matching device in the asynchronous transmission mode system, characterized in that for transmitting only the signal received from the selected physical layer unit to the ATM layer. According to claim 1, The physical layer selector, An optional utopian level 1 matching device in an asynchronous transfer mode system, characterized in that it is implemented using a programmable logic device. In the utopian level 1 matching method in an asynchronous transmission mode system in which a physical layer interface is selected using the utopia interface level 1, a) receiving a physical layer selection signal from outside according to the required physical layer; b) selecting one physical layer by adjusting a utopia level 1 control signal according to the received selection signal; And c) matching the selected one physical layer and the ATM layer responsible for partitioning and assembling the ATM cells; Utopia level 1 matching method in the asynchronous transmission mode system comprising a. The method of claim 7, wherein The physical layer unit, A first physical layer unit matched to UTOPIA LEVEL 1 and transmitting data at a first rate over an optical cable; And A second physical layer portion that is matched to UTOPIA LEVEL 1 and transmits data at a second rate over a twisted pair cable. Utopia level 1 matching method in the asynchronous transmission mode system comprising a. The method of claim 7, wherein Step b), Controlling the signal transmitted from the AT layer to be normally received only to the selected physical layer through a shared data transmission signal line; Utopia level 1 matching method in the asynchronous transmission mode system comprising a. The method of claim 7, wherein Step b), Controlling signals received from the physical layer unit to the AT layer through a shared data receiving signal line so that they do not collide with each other; Utopia level 1 matching method in the asynchronous transmission mode system comprising a. A recording medium comprising a utopia level 1 matching method in an asynchronous transmission mode system in which a physical layer interface is selected using a utopia interface level 1. a) a function of receiving a physical layer selection signal from the outside, in accordance with the required physical layer; b) selecting one physical layer by adjusting a utopia level 1 control signal according to the received selection signal; And c) a function of matching the selected one physical layer and the ATM layer responsible for partitioning and assembling the ATM cell; The recording medium in which the program is stored.