KR100264857B1 - Bidirectional switching on circuit in synchronous transmission apparatus - Google Patents

Abstract

PURPOSE: A bilateral switching circuit in a synchronous transmission device is provided to perform a bilateral transmission as one-to-one while transmitting information between a self and a self unit. CONSTITUTION: An alarm sensor(201) senses alarm signals(ALM1-ALM3) requesting a switching. An alarm signal transmission selector(202) decides whether a state of an eliminator(CR1) should be selected, and decides whether an alarm state of the alarm sensor(201) is transmitted. A state signal generator(204) supplies a value of a constant state such as a power-on. A switching command and protection card exist confirmer(206) confirms a switching command of another self unit, and confirms whether a protection card of the self unit exists. A state signal transmitter(205) transmits a determined value according to confirmed results. A switching command transmitter(203) decides whether the switching command should be transmitted to another self card for a signal of the alarm signal transmission selector(202) according to a command of the state signal generator(204).

Description

Bidirectional Switching Circuit in Synchronous Transmission Equipment {BIDIRECTIONAL SWITCHING ON CIRCUIT IN SYNCHRONOUS TRANSMISSION APPARATUS}

The present invention relates to a switching circuit in a transmission system, and more particularly, to a bidirectional switching circuit in a synchronous transmission device which transfers information in a bi-directional 1: 1 connection when a mutual information is connected by a cable between a self and a self unit. It is about.

In the conventional synchronous transmission device, when the high speed part and the low speed part are separated into a rack or a shelf, the transmission is performed by interfacing with each other when they are in the same rack or in different racks. The high speed unit and the low speed unit increase the reliability of the system when interlocked, and have a standby line and a channel in case. In order for the transfer to be performed, a transfer requirement must be generated and detected, and there is a unit of a central processing unit that performs this. A central processing unit is present in the high speed part shelf, and a central processing unit is mounted in the self part of the subordinate part to perform software switching from each switching requirement. According to the ITU-T standard, the transfer should be made within 50ms. However, in case of bi-directional switching, when the transfer is made in the high speed part, the transfer must be made in the subordinate part at the same time. The software of ITU-T standard that the unit of the high speed part central processing unit and the low speed part central processing unit exchange commands with each other There is a problem that becomes difficult to keep 50ms.

Accordingly, an object of the present invention is to provide a circuit which can reduce data loss by preventing processing delay by bidirectional switching in a system in which self and self unit are separated and mutual transmission is made of a cable.

1 is a diagram illustrating a transfer example of the first and n high speed self unit (101,103) and the first, n low speed self unit (102,104) according to the present invention

Figure 2 is an exemplary view for switching in Figure 1

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A detailed description of a preferred embodiment of the present invention will now be described with reference to the accompanying drawings. In the following, reference numerals are given to components of each drawing, even though the same components are shown in different drawings. Note that they have the same sign. Further, in describing the present invention, if it is determined that the detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or a chip designer, and the definitions should be made based on the contents throughout the present specification.

1 is a system diagram according to an embodiment of the present invention;

The first high speed self unit 101 and the first low speed self unit 102 are connected to each other via a transmission / reception switching command cable (SW R / T 1) and a data transmission cable (DT1). Numeral 103 and the nth low-speed self-time unit 104 are connected to each other by a transmission / reception switching command cable SW R / T 2 and a data transmission cable DT2.

In FIG. 1, 622Mb / s data is communicated between the first to nth high speed self-service units 101 and 103 and the first to nth low speed self-service units 102 and 104 through the data cables DT1 and DT2. At this time, when an error occurs in the first high speed self unit 101, the first low speed self unit 102 detects it and transfers the result to the nth low speed self unit 104. After the transfer operation is performed in the first low speed self-assembly unit 102, the command is transmitted through the transmission switching command cable SW_TX1 CABLE to perform the transfer between the first high speed self unit 101 and the nth low speed self-establishment unit 104. .

FIG. 2 is a system diagram for bidirectional switching in the configuration of the first to nth high speed self-support units 101 and 103 and the first to nth low speed self-time units 102 and 104 according to an embodiment of the present invention.

Alarm detection unit 201 for detecting the alarm (ALM1-ALM3) signal that is a switching requirement,

An alarm signal transmission selecting unit 202 for determining whether to select a state of elimination stage CR1 or whether the alarm detection unit 201 transmits an alarm state;

A state signal generator 204 for providing a predetermined state value such as power-on and providing a predetermined value in software;

A transfer order and protection card presence checking unit 206 for confirming the presence or absence of a protection card of the self unit, such as a transfer order of the other self unit, and

A state signal transmitting unit 205 for transmitting a value determined according to the state of the state signal generating unit 204 and the transfer command and protection card presence checking unit 206;

It is composed of a switch command transfer unit 203 for determining whether to give a transfer command to the counterpart Self card with respect to the signal of the alarm signal transfer selection unit 202 according to the command of the state signal transfer unit 205.

Therefore, referring to Figure 2 in detail,

When the alarm detecting unit 201 detects the alarms ALM1-ALM3, which are switching requirements, and inputs them to the alarm signal transmitting selecting unit 202, the alarm signal transmitting selecting unit 202 selects the state of the card removing terminal CR1. The state signal generator 204 may provide a value of a constant state such as power-on and also give a value in software, and provide it to the state signal transmitter 205. do. The transfer command and protection card presence check unit 206 checks whether there is a PROTECTION card of the same self as the transfer order of the opponent self and provides the state signal transfer unit 205. The state signal transfer unit 205 transfers a value determined according to the block states of the state signal generation unit 204 and the transfer command and protection card presence check unit 206 to the transfer command transfer unit 203. The transfer command transfer unit 203 determines whether to transfer a transfer command to the other party's self card according to the command generated by the state signal transfer unit 205. That is, the alarm detection unit 201 detects the occurrence of the switching requirement ALM1 --- N in FIG. . If there is a switching unit, the alarm signal transfer selection unit 202 transfers the signal transmitted from LINE1 to LINE2 as it is, and transfers the switching command COMM to the counterpart self unit by riding the SW_TX1 LINE of the transfer command transfer unit 203. If the CR1 (CARD REMOVE) state, the transfer state of LINE1 is ignored, and the CR1 state is transferred to the SW_TX1 as it is. The transfer command and protection card presence check unit 206 receives the SW_TX1 command of the counterpart self unit, and transfers it to LINE4 if the transfer command is selected. Line 6 of 203 is selected and transferred to SW_TX1 to perform a transfer command. If the CR2 is omitted, LINE8 is selected to pass LINE4, LINE7 is selected by the state signal transmission unit 205, and then LINE2 is selected by the transfer command transfer unit 203 and transferred to SW_TX1. At this time, since CR1 and CR2 are the same signal, when CR2 is CR1 (CARD REMOVE), it is not compulsorily executed at this time. In addition, the transfer command may be forcibly written by the state signal generator 204 to give a transfer command. However, in pure hardware, the power is kept at a constant value.

As mentioned above, when the switching requirement occurs and it is processed by software, it causes a lot of instantaneous data loss due to the processing time delay, and it was difficult to keep 50ms, which is the ITU-T recommendation. This has the advantage of increasing the effect of the transfer.

Claims (1)

The first high speed self unit 101 and the first low speed self unit 102 are connected to each other via a transmission / reception switching command cable (SW R / T 1) and a data transmission cable (DT1), and the n high speed self unit ( 103) and the nth low speed self-time unit 104 are connected to each other via a transmit / receive switching command command cable (SW R / T 2) and a data transmission cable (DT2) in the first or n low speed high speed self unit (101, 102, 103, 104). In the switching circuit of the synchronous transmission device for switching to another unit when an error occurs, An alarm detection unit 201 for detecting an alarm ALM1-ALM3 signal requesting the transfer; An alarm signal transmission selection unit 202 for determining whether to select a state of the elimination stage CR1 or whether the alarm detection unit 201 transmits an alarm state; A state signal generator 204 for providing a constant state value such as power on; A transfer order and protection card presence checking unit 206 for confirming the presence or absence of a protection card of the self unit, such as a transfer order of the other self unit, and A state signal transmitting unit 205 for transmitting a value determined according to the state of the state signal generating unit 204 and the transfer command and protection card presence checking unit 206; And a transfer command transfer unit 203 for determining whether to give a transfer command to the counterpart self card with respect to the signal of the alarm signal transfer selection unit 202 according to the state signal transfer unit 205 command. A bidirectional switching circuit in a synchronous transmission device, characterized in that it is embedded in each of one or n low / high speed self-unit (101, 102, 103, 104).

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