KR20020056978A - method for substituting an ISDN synchronizing clock of the keep-phone - Google Patents

method for substituting an ISDN synchronizing clock of the keep-phone Download PDF

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Publication number
KR20020056978A
KR20020056978A KR1020000087202A KR20000087202A KR20020056978A KR 20020056978 A KR20020056978 A KR 20020056978A KR 1020000087202 A KR1020000087202 A KR 1020000087202A KR 20000087202 A KR20000087202 A KR 20000087202A KR 20020056978 A KR20020056978 A KR 20020056978A
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South Korea
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isdn
board
clock
isdn board
active
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KR1020000087202A
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Korean (ko)
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이진권
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엘지전자 주식회사
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Priority to KR1020000087202A priority Critical patent/KR20020056978A/en
Publication of KR20020056978A publication Critical patent/KR20020056978A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/22Arrangements for supervision, monitoring or testing
    • H04M3/24Arrangements for supervision, monitoring or testing with provision for checking the normal operation
    • H04M3/244Arrangements for supervision, monitoring or testing with provision for checking the normal operation for multiplex systems
    • H04M3/245Arrangements for supervision, monitoring or testing with provision for checking the normal operation for multiplex systems for ISDN systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M2207/00Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
    • H04M2207/08ISDN systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE: A method for switching ISDN synchronizing clock of a key phone is provided to reduce the manufacturing cost of the key phone by detecting clock synchronization between ISDN boards without a clock control cable. CONSTITUTION: A main board is initialized(S1). The main board periodically detects state information confirming active state of each ISDN board, from each ISDN board(S2). The main board saves individual state information inputted from each ISDN board at a memory(S3). The main board grasps state information transmitted from each ISDN board for selecting the currently activated ISDN board, and synchronizes clocks of each ISDN board through the selected ISDN board(S4). It is determined whether the currently activated ISDN board becomes non-activated(S5). If non-activated, a newly activated ISDN board is selected.

Description

키폰의 아이에스디엔 동기 클럭 절체방법{method for substituting an ISDN synchronizing clock of the keep-phone}Method for substituting an ISDN synchronizing clock of the keep-phone}

본 발명은 키폰의 아이에스디엔 동기 클럭 절체방법에 관한 것으로, 특히 메인보드가 각각의 ISDN보드로부터 현재의 액티브정보를 검출하여 액티브 보드를 결정하고 그 설정한 해당 보드를 통해 ISDN 동기클럭신호을 공급하도록 하므로써, 클럭제어 케이블을 통하지 않고 ISDN보드간에 클럭동기를 ??출 수 있으므로 그에 따라 키폰의 제조비용을 상당히 저감시킬 수 있는 키폰의 아이에스디엔 동기 클럭 절체방법에 관한 것이다.The present invention relates to a method of switching the ISDN synchronous clock of a key phone, and in particular, the main board detects current active information from each ISDN board, determines an active board, and supplies an ISDN synchronous clock signal through the corresponding board. Accordingly, the present invention relates to a method of switching an ISDN synchronous clock of a key phone, which can reduce clock synchronization between ISDN boards without using a clock control cable, thereby significantly reducing the manufacturing cost of the key phone.

일반적으로 산업사회가 발전함에 따라 일정지점에서 원하는 다른 지점으로 데이터를 보다 적절히 그리고 신속히 전송시키기 위한 정보통신시스템들이 널리 사용되고 있는데, 이러한 정보통신시스템들은 통상 지리적으로 분산되어 있는 동종간 또는 이기종간 통신기기나 정보기기를 연결하여 상호간에 자원의 공유와 통신을 가능하도록 네트워크로 연결되는 것이 대부분이다. 그리고, 상기와 같은 네트워크에는 전기신호로 변환된 정보를 상대방과 주고받기 위해 통상 교환기를 사용하게 되는데, 가입자와 교환기를 연결하는 가입자 전송과 교환기간을 연결하는 국간 전송으로 구분된다.In general, as the industrial society develops, information communication systems are widely used to transfer data from one point to another desired more appropriately and quickly. Such communication systems are usually homogeneous or heterogeneous communication devices which are geographically dispersed. In most cases, information devices are connected to a network to enable sharing and communication of resources. In the network, a switch is usually used to exchange information converted into an electrical signal with a counterpart, and is divided into a subscriber transmission connecting a subscriber and an exchange and a transmission between stations connecting an exchange period.

특히, 상기와 같은 가입자 전송을 위한 교환시스템에는 설비용량이 크기에 있어 다양한 종류의 시스템이 현재 개발되어 사용되는데, 이러한 교환기중 빌딩이나 소규모 가입자를 위한 간이교환기시스템이 현재 널리 사용되고 있다. 그리고, 이러한 종래 간이교환기시스템 예컨대, 일명 키폰(keep-phone)은 필요한 기능을 하는 보드들이 마더 보드(mother board)상에 삽입되도록 되는데, 이러한 마더 보드를 가입자나 기타 용량에 따라 여러 개 조합하여 각각의 래크(rack)를 구성할 수도 있다.In particular, various types of systems are currently developed and used in the exchange system for subscriber transmission in terms of large facility capacity, and a simple exchange system for a building or a small subscriber among such exchanges is now widely used. In addition, such a conventional simple exchange system, for example, a key-phone, so that boards having necessary functions are inserted on a mother board, a plurality of such motherboards are combined according to subscribers or other capacities. It may be configured as a rack of.

그러면, 상기와 같은 키폰을 도 1을 참고살펴보면, 각각의 래크(70,71)에 마더보드를 통해 다수개 삽입되어 외부 교환기의 ISDN망과 연결된 ISDN보드(72A-N)와, 상기 래크(1,2)에 내선 가입자와 호를 연결시켜주는 내선보드(73)와, 이 내선보드(73)와 ISDN보드(72A-N)의 스위칭 기능을 제어하는 메인보드(74)와, 이 메인보드(74)를 포함하여 기타 시스템에 동작전원을 공급하는 전원장치부(75)를 포함한다.Then, referring to the key as described above with reference to Figure 1, each rack (70, 71) is inserted into a plurality of through the motherboard ISDN board (72A-N) connected to the ISDN network of the external exchange, and the rack (1) 2, an extension board 73 for connecting an extension subscriber and a call, a main board 74 for controlling switching functions of the extension board 73 and the ISDN board 72A-N, and the main board (2). And a power supply unit 75 for supplying operating power to other systems.

그리고, 상기 래크(70,71)는 링크보드(76)로 각층간에 신호가 연결된다. 그리고, 상기 ISDN보드(72A-N)들을 ISDN클럭동기를 위해 클럭제어신호를 송수신하는 클럭제어케이블(77)로 서로 연결된다.In addition, the racks 70 and 71 are connected to each other by a link board 76. The ISDN boards 72A-N are connected to each other with a clock control cable 77 for transmitting and receiving clock control signals for the ISDN clock mover.

한편, 상기와 같은 종래 ISDN보드가 구비된 키폰의 ISDN 클럭동기방법을 살펴보면, 먼저 키폰 시스템이 셋업될 경우 전원장치부(75)로부터 동작전원이 각 시스템에 공급되어 초기화되는데, 상기 메인보드(74)는 자체 클럭신호를 래크(70,71)의 각 보드(72A-N,73)로 공급하여 시스템을 동기시킨다. 이때, 만약 외부 교환기로부터 ISDN망을 통해 호신호가 입력되면 우선순위를 갖는 ISDN보드(72A-N)가 이를 수신하여 액티브(active)상태가 되어 외부 ISDN망으로부터 입력된 클럭에 동기하여 호를 처리한다. 그리고, 이 액티브된 ISDN보드(72B)는 외부 ISDN망에 동기된 동기클럭신호를 다른 각각의 ISDN보드(72A,72C-N)로 공급하여 전체적으로 클럭동기를 시키게 되는데, 이때 이 액티브된 ISDN보드(72B)는 연결된 클럭제어케이블(77)을 통해 바로 다음 ISDN보드(72C)로 지금 ISDN 클럭동기신호를 메인보드(74)로 전송할 것이므로 클럭신호를 메인보드(74)로 전송하지 말 것을 지시하는 제어신호를 송출한다. 그리고, 이전 ISDN보드(72B)가 비활성화상태에 있고 자신이 액티브가 될 경우 상기과정을 반복한다. 따라서, 이와같은 과정을 거쳐 ISDN보드들(72A-N)은 외부 ISDN망과 클럭을 동기시키게 된다.On the other hand, referring to the ISDN clock synchronization method of the conventional key-phone equipped with the ISDN board, when the key-phone system is set up, the operating power is supplied to each system from the power supply unit 75 and initialized. ) Supplies its own clock signal to the boards 72A-N, 73 of the racks 70, 71 to synchronize the system. At this time, if a call signal is input from the external exchange through the ISDN network, the ISDN board 72A-N having priority receives the signal and becomes active and processes the call in synchronization with the clock input from the external ISDN network. do. The active ISDN board 72B supplies a synchronous clock signal synchronized with an external ISDN network to each of the other ISDN boards 72A and 72C-N, thereby synchronizing the clock as a whole. 72B) is a control instructing not to transmit the clock signal to the main board 74 because the ISDN clock synchronous signal will now be transmitted to the main board 74 via the connected clock control cable 77 to the next ISDN board 72C. Send a signal. If the previous ISDN board 72B is in an inactive state and becomes active, the above process is repeated. Thus, through this process, the ISDN boards 72A-N synchronize their clocks with the external ISDN network.

그러나, 상기와 같은 종래 ISDN보드를 구비한 키폰은 다수의 ISDN보드(72A-N)간의 클럭제어를 위해 반드시 클럭제어케이블(77)을 연결시켜주어야 하므로 그에 따라 키폰의 제조비용이 상당히 증가하는 결점이 있었다.However, a key phone having the conventional ISDN board as described above must be connected to the clock control cable 77 for clock control between a plurality of ISDN boards (72A-N), so that the manufacturing cost of the key phone significantly increases accordingly. There was this.

뿐만 아니라, 상기와 같은 키폰은 클럭동기시 절체우선순위에 따라 ISDN보드간(72A-N)의 클럭제어신호가 전송되기때문에 후순위의 ISDN보드(72A-N)에 연결된 클럭제어케이블(77)의 역할이 미약하여 이들에 연결된 클럭제어케이블(77)의 효용성이 상당히 저하된다는 문제점이 있었다.In addition, the keyphone as described above, because the clock control signal between the ISDN boards (72A-N) is transmitted according to the switching priority when the clock synchronization, the clock control cable (77) connected to the ISDN board (72A-N) of the lower priority There was a problem in that the role of the clock control cable 77 connected to these weakly reduced the utility.

이에 본 발명은 상기와 같은 제반문제점을 해결하기 위해 발명된 것으로, 메인보드가 각각의 ISDN보드로부터 현재의 액티브정보를 검출하여 액티브 보드를 결정하고 그 설정한 해당 보드를 통해 ISDN 동기클럭신호을 공급하도록 하므로써, 클럭제어 케이블을 통하지 않고 ISDN보드간에 클럭동기를 ??출 수 있으므로 그에 따라 키폰의 제조비용을 상당히 저감시킬 수 있는 키폰의 아이에스디엔 동기 클럭 절체방법을 제공함에 그 목적이 있다.Accordingly, the present invention has been invented to solve the above problems, the main board to detect the current active information from each ISDN board to determine the active board and to supply the ISDN sync clock signal through the set board Therefore, it is possible to provide clock synchronization between ISDN boards without going through a clock control cable, and therefore, an object of providing an IDS synchronous clock switching method of a key phone that can significantly reduce the manufacturing cost of the key phone.

본 발명의 다른 목적은 ISDN보드간의 클럭동기를 자동적으로 제어하게 되므로 그에 따라 키폰시스템의 ISDN클럭동기 특성을 상당히 향상시키는 키폰의 아이에스디엔 동기 클럭 절체방법을 제공하는데 있다.Another object of the present invention is to provide a method for switching the ISDN synchronization clock of a key phone, which is to automatically control the clock synchronization between ISDN boards, thereby significantly improving the ISDN clock synchronizer characteristics of the key phone system.

상기와 같은 목적을 달성하기 위한 본 발명은 키폰에서 각각의 ISDN보드들의 액티브 상태를 확인하는 상태정보를 주기적으로 ISDN보드들로부터 검출하여 저장하는 ISDN보드 상태정보검출단계와, 이 ISDN보드 상태정보검출단계에 의해 검출된 상태정보를 파악하여 현재 액티브된 ISDN보드를 선택하고 이 선택된 ISDN보드를 통해 각 ISDN보드의 클럭을 동기시키는 ISDN클럭동기단계와, 상기 ISDN클럭동기단계후에 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드가 비활성되었는지를 판단하고 그 결과에 따라 새롭게 액티브된 ISDN보드를 재선택하고 이 선택된 ISDN보드를 통해 각 ISDN보드의 클럭을 동기시키는 ISDN클럭동기절체단계로 이루어진 것을 특징으로 하는 키폰의 아이에스디엔 동기 클럭 절체방법을 제공한다.The present invention for achieving the above object is the ISDN board state information detection step of periodically detecting and storing the state information to confirm the active state of each ISDN board in the key phone from the ISDN board, and the ISDN board state information detection The ISDN clock synchronizing step of identifying the state information detected by the step and selecting the currently active ISDN board and synchronizing the clock of each ISDN board through the selected ISDN board and supplying the current clock synchronizing signal after the ISDN clock synchronizing step Determining whether an active ISDN board is inactive and reselecting the newly activated ISDN board according to the result, and the ISDN clock synchronization switching step of synchronizing the clock of each ISDN board through the selected ISDN board. Provided is a method for switching the ISDN synchronization clock of a key phone.

도 1은 종래 키폰의 ISDN보드간 클럭동기를 설명하기 위한 설명도.1 is an explanatory diagram for explaining clock synchronization between ISDN boards of a conventional key phone.

도 2는 본 발명이 적용되는 키폰을 설명하는 설명도.2 is an explanatory diagram illustrating a key phone to which the present invention is applied.

도 3은 본 발명의 플로우 차트이다.3 is a flow chart of the present invention.

<부호의 상세한 설명><Detailed Description of Codes>

1 : 래크 2 : 래크1: rack 2: rack

3A-N: ISDN보드 4 : 내선보드3A-N: ISDN Board 4: Extension Board

5 : 메인보드 6 : 전원장치부5: Main board 6: Power supply unit

7 : 링크보드 8 : 메모리7: link board 8: memory

이하, 본 발명을 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

본 발명이 적용되는 키폰은 도 2에 도시된 바와같이 각각의 래크(1,2)에 마더보드를 통해 다수개 삽입되어 외부 교환기의 ISDN망과 연결된 ISDN보드(3)와, 상기 래크(1,2)에 내선 가입자와 호를 연결시켜주는 내선보드(4)와, 이 내선보드(4)와 ISDN보드(3)의 스위칭 기능을 제어하는 메인보드(5)와, 이 메인보드(5)를 포함하여 기타 시스템에 동작전원을 공급하는 전원장치부(6)와, 상기 래크들(1,2)의 각층을 연결시켜주는 링크보드(7)를 포함한다.Keyphones to which the present invention is applied are inserted into a plurality of racks (1, 2) through the motherboard as shown in Figure 2 is connected to the ISDN network of the external switchboard ISDN board (3), the rack (1, 2) an extension board 4 which connects an extension subscriber to a call, a main board 5 for controlling switching functions of the extension board 4 and the ISDN board 3, and the main board 5; And a power supply unit 6 for supplying operating power to other systems, and a link board 7 for connecting each layer of the racks 1 and 2.

그리고, 상기 메인보드(5)에는 정보를 저장하는 메모리(8)가 구비된다.The main board 5 is provided with a memory 8 for storing information.

다음에는 상기와 같은 키폰 시스템에 적용되는 본 발명의 방법을 설명한다.Next, the method of the present invention applied to the above-described key phone system will be described.

본 발명은 키폰 시스템이 셋업될 경우 전원장치부(6)로부터 동작전원이 각 시스템에 공급되어 초기화된다. 그러면, 상기 키폰의 메인보드(5)가 자체 클럭신호를 래크(1,2)의 각 보드(3A-N,4)로 공급하여 시스템을 동기시킨 다음 도 3에 도시된 바와같이 ISDN 동기클럭 절체기능을 실행한다.In the present invention, when the key phone system is set up, the operating power is supplied from the power supply unit 6 to each system and initialized. Then, the main board 5 of the key phone supplies its own clock signal to each board 3A-N, 4 of the rack 1, 2 to synchronize the system, and then transfers the ISDN sync clock as shown in FIG. Run the function.

즉, 상기 메인보드(5)는 초기상태(S1)에서 ISDN보드 상태정보검출단계(S2)로 진행하여 각각의 ISDN보드들의 액티브 상태를 확인하는 상태정보를 주기적으로 ISDN보드들로부터 검출한다. 그리고, 상기 ISDN보드 상태정보검출단계(S2)후에 상태정보저장단계(S3)로 진행하여 각 ISDN보드로부터 입력된 개별 상태정보들을 메모리에 저장한다. 그리고, 상기 상태정보저장단계(S3)후에 ISDN클럭동기단계(S4)로 진행하여 각 ISDN보드로부터 전송된 상태정보를 파악하여 현재 액티브된 ISDN보드를 선택하고 이 선택된 ISDN보드를 통해 각 ISDN보드의 클럭을 동기시킨다.That is, the main board 5 proceeds to the ISDN board state information detection step S2 in the initial state S1 and periodically detects state information for checking the active state of each ISDN board from the ISDN boards. After the ISDN board state information detection step S2, the state information storage step S3 is performed to store individual state information input from each ISDN board in memory. After the state information storage step (S3), the ISDN clock synchronous step (S4) proceeds to determine the state information transmitted from each ISDN board, and selects the currently active ISDN board and selects each ISDN board through the selected ISDN board. Synchronize the clock.

한편, 상기 ISDN클럭동기단계(S4)후에 정보변경 판단단계(S5)로 진행하여 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드가 비활성되었는지를 판단한다. 그리고, 상기 정보변경 판단단계(S5)중에 판단한 결과 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드가 비활성되지 않았을 경우는 현재 상태를 계속 유지시킨다. 그러나, 상기 정보변경 판단단계(S5)중에 판단한 결과 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드가 비활성되었을 경우는 상기 ISDN클럭동기단계(S4)로 복귀하여 새롭게 액티브된 ISDN보드를 재선택하고 이 선택된 ISDN보드를 통해 각 ISDN보드의 클럭을 동기시킨다.On the other hand, after the ISDN clock synchronization step (S4) to proceed to the information change determination step (S5) to determine whether the active ISDN board currently supplying the clock synchronization signal is inactive. If the active ISDN board supplying the current clock synchronization signal is not inactivated as a result of the determination during the information change determination step (S5), the current state is maintained. However, if the active ISDN board supplying the current clock synchronization signal is inactivated as a result of the determination during the information change determination step (S5), it returns to the ISDN clock synchronization step (S4) and reselects the newly activated ISDN board. Synchronize the clock of each ISDN board through this selected ISDN board.

환언하면, 상기 메인보드(5)는 각각의 ISDN보드(3A-N)들의 액티브 상태를 확인하는 상태정보를 주기적으로 이 ISDN보드들(3A-N)로부터 검출한 다음 각 ISDN보드(3A-N)로부터 입력된 개별 상태정보들을 메모리(8)에 저장한다. 그리고, 상기 메인보드(5)는 각 ISDN보드(3A-N)로부터 전송된 상태정보를 파악하여 현재 액티브된 ISDN보드(3A-N)를 선택하고 예컨대, 1번 ISDN보드(3A)가 액티브되었다면 이 1번ISDN보드(3A)를 통해 전체 ISDN보드(3B-N)의 클럭을 동기시킨다.In other words, the main board 5 periodically detects from the ISDN boards 3A-N the status information confirming the active state of the respective ISDN boards 3A-N, and then each ISDN board 3A-N. The individual state information inputted from) is stored in the memory 8. The main board 5 grasps the state information transmitted from each ISDN board 3A-N, selects the currently active ISDN board 3A-N, and, for example, if the ISDN board 3A 1 is active. Through this ISDN board 3A, the clocks of all ISDN boards 3B-N are synchronized.

이때, 상기 메인보드(5)는 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드(3A-N)즉, 1번 ISDN보드(3A)가 비활성되었는지를 판단하는데, 이때 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드(3A)가 비활성되지 않았을 경우는 현재 상태를 계속 유지시킨다. 그러나, 상기 메인보드(5)는 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드(3A)가 비활성되었을 경우는 새롭게 액티브된 다른 ISDN보드(3C)를 재선택하고 예컨대, 3번 ISDN보드(3C)가 재선택되었다면 이 재선택된 ISDN보드(3C)를 통해 다른 ISDN보드(3A,3B,3D-N)의 클럭을 동기시킨다.At this time, the main board (5) determines whether the active ISDN board (3A-N) that is currently supplying the clock synchronization signal, that is, ISDN board (3A) No. 1, the current clock synchronization signal is supplied If the active ISDN board 3A is not inactive, it maintains its current state. However, when the active ISDN board 3A that is currently supplying the clock synchronization signal is deactivated, the main board 5 reselects another newly activated ISDN board 3C and, for example, the third ISDN board 3C. If is reselected, the clocks of the other ISDN boards 3A, 3B, and 3D-N are synchronized through this reselected ISDN board 3C.

이상 설명에서와 같이 본 발명은 메인보드가 각각의 ISDN보드로부터 현재의 액티브정보를 검출하여 액티브 보드를 결정하고 그 설정한 해당 보드를 통해 ISDN 동기클럭신호을 공급하도록 하므로써, 클럭제어 케이블을 통하지 않고 ISDN보드간에 클럭동기를 ??출 수 있으므로 그에 따라 키폰의 제조비용을 상당히 저감시킬 수 있는 장점을 가지고 있다.As described above, the present invention allows the main board to detect the current active information from each ISDN board, determine the active board, and supply the ISDN sync clock signal through the corresponding board, thereby providing the ISDN without going through a clock control cable. Clock synchronization can be achieved between boards, which has the advantage of significantly reducing the manufacturing cost of the keyphone.

또한, 본 발명에 의하면, ISDN보드간의 클럭동기를 자동적으로 제어하게 되므로 그에 따라 키폰시스템의 ISDN클럭동기 특성을 상당히 향상시키는 효과도 있다.In addition, according to the present invention, since the clock synchronization between the ISDN board is automatically controlled, there is an effect of significantly improving the ISDN clock synchronizer characteristics of the key phone system.

Claims (1)

키폰에서 각각의 ISDN보드들의 액티브 상태를 확인하는 상태정보를 주기적으로 ISDN보드들로부터 검출하여 저장하는 ISDN보드 상태정보검출단계와, 이 ISDN보드 상태정보검출단계에 의해 검출된 상태정보를 파악하여 현재 액티브된 ISDN보드를 선택하고 이 선택된 ISDN보드를 통해 각 ISDN보드의 클럭을 동기시키는 ISDN클럭동기단계와, 상기 ISDN클럭동기단계후에 현재 클럭동기신호를 공급하고 있는 액티브된 ISDN보드가 비활성되었는지를 판단하고 그 결과에 따라 새롭게 액티브된 ISDN보드를 재선택하고 이 선택된 ISDN보드를 통해 각 ISDN보드의 클럭을 동기시키는 ISDN클럭동기절체단계로 이루어진 것을 특징으로 하는 키폰의 아이에스디엔 동기 클럭 절체방법.The ISDN board status information detection step of periodically detecting and storing status information for checking the active state of each ISDN board in the key phone, and the current status information detected by the ISDN board status information detection step Selecting an active ISDN board and synchronizing the clock of each ISDN board through the selected ISDN board, and determining whether the active ISDN board currently supplying the clock synchronization signal after the ISDN clock synchronization step is inactive. And the ISDN clock synchronization switching step of reselecting the newly activated ISDN board according to the result and synchronizing the clock of each ISDN board through the selected ISDN board.
KR1020000087202A 2000-12-30 2000-12-30 method for substituting an ISDN synchronizing clock of the keep-phone KR20020056978A (en)

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