KR20030014560A - OSU:Optical Switching Unit - Google Patents

Abstract

PURPOSE: An independently optical clipper performing an automatic switching function between 155/622 Mbps grade active and standby optical ports is provided to match an optical transmitter having 155/622 Mbps grade active and standby ports which do not provide an optical switching function to an optical transmitter having 155/622 Mbps grade optical port. CONSTITUTION: 155/622 Mbps grade optical signals TxA and TxB(204,208) from two port optical transmitter are transmitted to a divider module(202). 1:2 divider(203) divides the 155/622 Mbps grade optical signal TxA(204) into two signals(205,206). 1:2 divider(207) divides the 155/622 Mbps grade optical signal TxB(208) into two signals(209,210). A monitoring control module(211) continues to monitor a warning status from the two divided signals(205,209). The warning status includes a signal loss, a frame loss, a general alarm detection, and excessive bit error. A selector module(213) receives the two divided signals(206,210) and selects a control signal from the monitoring control module(211).

Description

Standalone optical switcher with automatic switching between 155 / 622Mbps active and standby optical ports {OSU: Optical Switching Unit}

The present invention matches an optical transmission device having a 155/622 Mbps active and standby optical port and does not perform an internal switching function to an optical transmission device having one 155/622 Mbps optical port. The present invention relates to an independent device type optical switching unit (OSU).

In the conventional optical transmission device having a 155/622 Mbps operation and a spare optical port, the switching function for the optical signal input and output is not provided, or it is composed of a structure in which the optical selector (Coupler) and splitter (Splitter) is built in the optical transmission device It is. The optical signal output in the optical transmission device having such a built-in structure has a switching effect by an internal switching switch, and the optical signal input is generally made to be separately incident using an optical splitter.

The prior art will be briefly described with reference to FIG. 1.

FIG. 1 is a diagram illustrating the internal and mutual matching configuration of an optical transmission device having a conventional 155/622 Mbps operation and a spare optical port and a switching function and an optical transmission device having a single 155/622 Mbps optical port. As shown in FIG. 1, the built-in optical transmission device 101 includes two optical interface boards 102 and 104 for inter-device interfaces 111 and 112, and a transfer control module 103 that analyzes an input optical signal to perform a steel body switch function. ), A selector module 105 for selecting one optical signal from two optical signals, and a divider module 106 for separating the two optical signals from one optical signal.

One port optical transmission device 113 is composed of one optical interface board 114 for inter-device interfaces 111 and 112.

One of the two optical interface boards A, B (102, 104) acts as an operation port, the other acts as a spare port, and the optical switching function is a mutual conversion function between them.

When the optical signal is output, the optical signals of the optical interface boards A and B 102 and 104 are first analyzed by the switching control module 103 for the occurrence and contents of the optical signal errors of the operating interface board, In this case, switching to the preliminary interface board is performed. In this case, the optical interface board in which an error occurs is operated as a preliminary board. The optical signals 107, 108 from the two interface boards 102, 104 processed by the transfer control module 103 are transmitted to the selector module 105, and selects one optical signal from the operating interface board. Transfer to the output port 111.

When the optical signal is input, the optical signal 112 received from the one-port optical transmission device 113 is divided into two optical signals 109 and 110 by the splitter 106, and the respective optical interface boards A and B 102 , 104).

However, in the prior art, since there is no independent type of optical switching device, an optical transmission device having a 155/622 Mbps operation and a spare optical port that does not provide the optical switching function, and an optical transmission device having one 155/622 Mbps optical port The problem arises that the furnace cannot be matched.

The present invention has been made to solve the problems of the prior art, and the present invention provides an optical transmission device having a 155/622 Mbps operation and a spare optical port that does not provide an optical switching function. It is an object of the present invention to enable matching to the optical transmission device having the same.

1 is a diagram illustrating the internal and mutual matching configuration of an optical transmission device having a conventional 155/622 Mbps operation and a spare optical port and incorporating a switching function and an optical transmission device having one 155/622 Mbps optical port.

Figure 2 is an internal configuration of the optical switch according to the present invention.

<Description of Main Parts of Drawings>

100,200: central processing unit 101,201: upper layer

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

2 is a detailed block diagram of a stand-alone optical changer having a 155/622 Mbps operation and a reserve optical port according to the present invention. As shown in FIG. 2, the internal configuration of the stand-alone optical changer 201 includes a splitter module 202 performing a separation function into two optical signals and a 155/622 Mbps signal received from the operational and spare optical ports. Supervisory control module 211 that monitors the occurrence of an error from the controller and performs switching and signal functions for the detected error, and a control signal 212 of the supervisory control module 211 from the two optical signals 206 and 210. ) And a selector module 213 for selecting one optical signal of the operation port and outputting the optical signal to the TxCOM 214.

Hereinafter, the application of the present invention will be described in detail with reference to FIG. 2 and the description of the configuration of the above-described embodiment of the present invention.

In FIG. 2, the 155/622 Mbps class optical signals TxA, TxB 204, 208 from the two port optical transmission device are first delivered to the splitter module 202. The TxA 204 delivered to the divider module 202 is passed to the 1: 2 divider 203 and separated into two signals 205 and 206. The two separate signals are applied to the monitoring control module 211 and the selector module 213. Likewise, the TxB 208 delivered to the divider module 202 is passed to the 1: 2 divider 207 and separated into two signals 209 and 210. The two separate signals are applied to the monitoring control module 211 and the selector module 213.

The monitoring control module 211 continuously monitors alarm states such as signal loss (LOS), frame loss (LOF), power alarm detection (RDI), and transient bit error (EBER) from two applied signals 205 and 209. When an alarm occurs in the signal of the working port, it checks the alarm state of the standby port signal and confirms that there is no corresponding alarm and class alarm, and then performs the changeover to maintain the stability of the service. Both signals 205 and 209 of the two ports take appropriate measures according to their priority when an alarm occurs. In addition, the operator generates visible and audible information according to the alarm.

The selector module 213 receives one signal 206, 210 for each interface separately applied by the distributor module 202, selects one signal controlled 212 from the supervisory control module 211, and transmits the signal to the TxCom 214. Output

For the input signal RxCOM 216 from one port optical transmission device it is separated into two signals 217 and 218 by the 1: 2 separator 215 of the separator module 202 and sent to the two port optical transmission device.

As described above, the present invention performs only a switching function as an independent device, and has a 155/622 Mbps active and standby optical port, and a single 155/622 Mbps class optical transmission device having no switching function. There is an effect to enable matching with an optical transmission device having an optical port.

Claims (4)

Working and Standby An optical switch that has two equal-speed optical ports and does not perform a transfer function between these ports and performs a light transfer function between an optical transmission device having one optical port and an optical transmission device having one optical port. In the system, A splitter module for separating each of the two optical ports into two optical signals, A supervisory control module that monitors the occurrence of errors from the two optical signals received from the operational and redundant optical ports and performs switching and signal functions for the detected errors; and A system comprising a selector module that selects one optical signal from an operating port and outputs it to one output optical port according to a control signal of a supervisory control module from two optical signals. The method of claim 1, Optical changer system, An optical switch having an input / output optical port of the same speed of 155Mbps or 622Mbps. The method of claim 1, The optical splitter module, A 1: 2 splitter is configured for each of the optical ports from the two-port optical transmission system, One 1: 2 splitter is connected and connected to the optical port from one port optical transmission system, Each 1: 2 divider divides one signal into two identical signals, Each separate signal from the two-port optical transmission system is applied to the supervisory control module and the selector module. An optical changer system, characterized in that separate optical signals from one optical port system are forwarded to respective ports of the two optical port systems. The method of claim 1, The monitoring control module, It continuously monitors alarm status such as signal loss, frame loss, alarm signal detection, EBER, etc. from signals applied by two 1: 2 splitter modules. In case of alarm of operation port, check alarm condition of reserve port. After confirming that there is no corresponding alarm and class alarm, the transfer is performed. When signals from both ports take alarms, appropriate action is taken according to priority. Optical switcher, characterized in that to inform the operator by generating the visible, audible information according to the alarm.