JP6651833B2 - Communication system, redundant communication device, and communication control method - Google Patents

Description

  The present invention relates to a communication system, a redundant communication device, and a communication control method, for example, power supply control of an IP switching device having an IP switching device of a dual redundant configuration (active (ACT) / standby (SBY)). It can be applied to

  2. Description of the Related Art Conventionally, an IP exchange connected (accommodated) to a subscriber terminal (telephone terminal) and connected to an IP network generally has a redundant configuration with two or more duplexes. Hereinafter, the active system (active system) and the standby system (standby system) of the duplexed IP switching device are also referred to as “ACT system” and “SBY system”. As a conventional redundant IP switching device, there is a technology described in Patent Document 1, for example.

  In addition, in a conventional redundantly configured IP switch, a large number of IP switches are generally maintained and monitored by a management device on an IP network. As a management device of the IP exchange, for example, there is a device called an element management system (hereinafter abbreviated as “EMS”) or an operation system (hereinafter abbreviated as “OpS”).

  By the way, in the redundantly configured IP switching device, when a failure occurs in the ACT-based IP exchange, a switching process is performed in which the SBY-based IP exchange is set to the ACT-based and the failed IP exchange is set to the SBY-based. However, due to a software halt state (frozen), the failed IP switch may not be able to switch the system and may not be able to recover by resetting. In such a case, it is effective means to recover by turning off / on the power of the IP exchange.

  Generally, the management device and the IP switch are located at different bases, but the installation site of the IP switch is not always waiting for the maintenance manager like the installation site of the management device. In other words, there is a problem that it is not possible to quickly restore the failed IP switch by turning off / on the power supply. Here, there is a technique for solving the above problem by turning off / on the power of the IP exchange remotely from the management apparatus (see Patent Document 2).

JP 2007-189321 A JP-A-4-167734

  However, the technology described in Patent Literature 2 is a technology mainly intended to be applied to a small-scale system in order to save power and is not a technology intended to be applied to a device having a redundant configuration. For example, even if the technology described in Patent Literature 2 is applied to a device having a redundant configuration (duplicated IP switching device), it is only necessary to separately control the remote power of each of the two IP switching devices. However, it cannot be said that the power supply of the controlled object can be efficiently controlled.

  Therefore, a communication system, a redundant communication device, and a communication control method that can efficiently control a power supply of a device having a redundant configuration are desired.

According to a first aspect of the present invention, there is provided a communication system comprising: a redundant communication device having at least one active communication device and one standby communication device; and a management device connected to the redundant communication device via a network. The apparatus includes: (1) a first power supply control packet for controlling the power supply of the active communication device or the standby communication device for each of the active communication device and the standby communication device; A second power control packet for controlling the power of both the communication device and the standby communication device can be transmitted, and a power control packet of either the first power control packet or the second power control packet a power supply control packet transmitter for transmitting, each of said operational system communication device and the standby system communication devices, power supply system for receiving (2-1) the power control packet A packet receiving unit, (2-2) and the power control packet analyzer for analyzing the power control packet, said power supply control packets analyzed by the (2-3) the power control packet analysis unit, the first power supply If it is a control packet, the power supply of the active communication device or the standby communication device is controlled. On the other hand, if it is the second power control packet, the active communication device and the standby communication device are controlled. And a power supply control unit for controlling both power supplies.

According to a second aspect of the present invention, in the redundant communication device having at least one active communication device and one standby communication device, each of the active communication device and the standby communication device includes: (1) the active communication device or A first power control packet for controlling power of the standby communication device and a second power control packet for controlling power of both the active communication device and the standby communication device; A power control packet receiving unit that receives any one of the first power control packet and the second power control packet transmitted from an external device ; and (2) a power control that analyzes the power control packet. a packet analysis unit, (3) the power control packets analyzed by the power control packet analysis unit, when it was the first power control packet, before Controls the power supply of the active communication device or the standby communication device, whereas the return when a second power control packet, the power supply control for controlling the power of both the operation system communication device and the standby system communication device And a part.

According to a third aspect of the present invention, there is provided a communication control method for controlling a redundant communication device having at least one active communication device and one standby communication device, and a management device connected to the redundant communication device via a network. (1) A power control packet transmission unit of the management device, for each of the active communication device and the standby communication device, a first power control packet for controlling the power of the active communication device or the standby communication device . power control packet and the operation system communication device and is capable of transmitting a second power control packet for controlling the power supply of both the standby communication device, the first power control packet or the second power control and send one of the power control packet of the packet, each of the operational system communication device and standby system communication device, (2) power control packet receiving unit, the power control packet Receive, (3) power control packet analysis unit analyzes the power control packet, (4) power control unit, the power control packets analyzed by the serial power control packet analysis unit, the first If the packet is a power control packet, the power of the active communication device or the standby communication device is controlled. If the power control packet is the second power control packet, the active communication device and the standby communication device are controlled. It is characterized in that both power supplies of the device are controlled.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply of the apparatus of a redundant structure can be controlled efficiently.

FIG. 1 is a block diagram illustrating a functional configuration of an IP switching device according to an embodiment and a connection configuration (communication system) around the functional configuration. FIG. 4 is an explanatory diagram illustrating a structure of a power control packet determination table according to the embodiment. FIG. 4 is a sequence diagram (part 1) illustrating operations of the IP switching device and the EMS according to the embodiment. It is the sequence figure (the 2) which showed operation of IP exchange device and EMS concerning an embodiment. FIG. 10 is a sequence diagram (part 3) illustrating operations of the IP switching device and the EMS according to the embodiment. FIG. 10 is a sequence diagram (part 4) illustrating operations of the IP switching device and the EMS according to the embodiment.

(A) Main Embodiment Hereinafter, embodiments of a communication system, a redundant communication device, and a communication control method according to the present invention will be described in detail with reference to the drawings. Here, the redundant communication device according to the embodiment is an IP switching device including two IP switches having a redundant configuration. The communication system according to the embodiment is a system including an IP switching device and a management device that manages the IP switching device.

(A-1) Configuration of Embodiment FIG. 1 is a block diagram showing a functional configuration of an IP switching device 1 of this embodiment and a connection configuration (communication system) around the functional configuration.

  As shown in FIG. 1, the IP switching apparatus 1 includes two IP switches 10 (10-1 and 10-2), and the two IP switches 10-1 and 10-2 form a redundant configuration. In the following, the IP exchange 10-1 is also referred to as a “first IP exchange” and the IP exchange 10-2 is also referred to as a “second IP exchange.” In the IP exchange 1, the IP exchange 10- It is assumed that an active / standby redundant configuration is adopted in which one of the devices 1 and 10-2 operates as an ACT system (active system) and the other operates as an SBY system (standby system). Although the number of IP exchanges 10 constituting the device 1 is not limited, it is assumed that the IP exchanges 10 are configured by at least one ACT system (operating system) and one SBY system (standby system) (two in total). I do.

  The IP exchanges 10-1 and 10-2 connect (accommodate) to the subscriber terminal 50 via the subscriber line 30 (for example, a line such as a twisted pair cable) and a metal UNI (User Network Interface) 40, and make telephone calls. We provide services. In the IP switching device 1, even if one of the IP switches 10-1 and 10-2 is stopped due to a failure or the like, the service provision to the subscriber terminal 50 can be continued.

  The IP exchanges 10-1 and 10-2 can communicate with the EMS 60 via the IP network 70. The EMS 60 is a terminal that executes processing related to management of the IP exchanges 10-1 and 10-2 (including processing of remote power control).

  Next, the internal configuration of the IP switches 10-1 and 10-2 will be described. In this embodiment, a description will be given assuming that the hardware configurations of the IP switches 10-1 and 10-2 are the same.

  Each IP exchange 10 (10-1, 10-2) includes a control unit 15 (15-1, 15-2), a power supply unit 16 (16-1, 16-2), and a network interface (NWIF) unit 20 (20 -1, 20-2).

  The control unit 15 has a function of controlling the entire IP exchange 10. For example, the control unit 15 controls the NWIF unit 20 and performs a process of cooperating with the other IP exchange 10 (switching between the ACT system and the SBY system). The control unit 15 is configured as software for some or all of the functions.

  The NWIF unit 20 is an interface that communicates with the external IP network 70 and has a function of controlling the power supply unit 16 that supplies power to the control unit 15. The NWIF unit 20 has an external packet IF unit 21, a special packet analysis unit 22, a power control unit 23, and an internal packet IF unit 24.

  The external packet IF unit 21 has a function of a network interface for connecting to the external IP network 70. Further, the external packet IF unit 21 receives not only the IP packet addressed to itself but also the IP packet addressed to the other IP exchange. Then, the external packet IF unit 21 sends the received IP packet to the special packet analyzing unit 22. Further, the external packet IF unit 21 has an interface for connecting to the subscriber line 30 (in FIG. 1, for convenience, the subscriber line 30 is not shown to be directly connected to the external packet IF unit 21; Is connected).

  The special packet analysis unit 22 determines whether the received IP packet is a power control special packet transmitted from the EMS 60. If the special packet analysis unit 22 determines that the packet is a power control special packet, the special packet analysis unit 22 sends the packet to the power control unit 23. On the other hand, if the special packet analysis unit 22 determines that the packet is a packet other than the power control special packet, it sends the packet to the internal packet IF unit 24.

  The power control unit 23 controls the power supply unit 16 (16-1, 16-2) that supplies power to each control unit 15 (15-1, 15-2) according to the content of the special packet for power control. I do.

  The internal packet IF unit 24 is an interface that directly communicates with each of the internal control units 15 (15-1, 15-2). For example, the internal packet IF unit 24 has a function of distributing an IP packet to each control unit 15 (15-1, 15-2) according to the destination of the received IP packet.

  The power supply unit 16 supplies power to the control unit 15 and the NWIF unit 20. For example, the power supply unit 16 can switch on / off the power supplied to the control unit 15 based on remote power control from the EMS 60.

  Next, a specific example in which the EMS 60 remotely controls the power of the first IP exchange 10-1 and the second IP exchange 10-2 will be described.

  First, the EMS 60 periodically transmits a message (for example, ping, snmpget, or the like) for confirming existence to the first IP exchange 10-1 and the second IP exchange 10-2. Then, the EMS 60 confirms the existence of the monitored first IP exchange 10-1 and the second IP exchange 10-2 by receiving the response message to the existence confirmation message. Here, for example, if a response message is not returned for a predetermined period of time in response to the existence confirmation message of a predetermined number of times, the EMS 60 determines whether the first IP exchange 10-1 or the second IP exchange 10-2 (or its It is determined that some abnormality (for example, software abnormality) has occurred in both. Normally, when an IP switch detects some abnormality, it resets (returns to an initial state) to perform autonomous recovery processing. However, for example, if the CPU is always in a 100% state (so-called frozen state) due to a software bug or the like, the reset processing is not performed and the IP exchange 10 may not be able to recover autonomously. In this state, the IP exchange may be restored by turning off the power once and then turning it on again.

  In the IP exchange 10 according to this embodiment, the control unit 15 and the NWIF unit 20 are completely separated from each other. For example, even if an abnormality occurs in the control unit 15 and the control becomes impossible, the operation of the NWIF unit 20 is stopped. There is no effect (the NWIF unit 20 can continue the operation such as receiving the packet from the EMS 60). That is, the NWIF unit 20 receives the special packet for power control from the EMS 60 and turns off the power unit 16 (16-1, 16-2) that supplies power to the control unit 15 (15-1, 15-2). / ON can be executed. As described above, the IP exchange 10 can attempt to recover the IP exchange 10 by remote power control from the EMS 60.

  Next, a specific process regarding the remote power control of the EMS 60 will be described.

  The EMS 60 turns off the power of the control unit 15 to the first IP exchange 10-1 or the second IP exchange 10-2 (or both) that did not respond to the above-mentioned survival confirmation message. N special packets for power control are continuously transmitted a predetermined number of times (for example, 20 times in 100 ms). The EMS 60 may use a dedicated tool (software) for setting the number of transmissions and setting the power supply to be controlled. As a modification, the EMS 60 may transmit only one special packet for power control. Subsequently, the EMS 60 transmits a special packet for power control for turning on the power in the same manner as described above.

  Next, a specific process related to remote power control in the NWIF unit 20 will be described.

  The external packet IF unit 21 sends the IP packet received from the EMS 60 via the IP network 70 to the special packet analysis unit 22. The special packet analysis unit 22 determines whether the received IP packet is a power control special packet. Note that the special packet analysis unit 22 can use various various methods to determine whether the packet is a special packet for power control or another packet. In this embodiment, for example, The determination is made using the power control packet determination table T.

  FIG. 2 is an explanatory diagram illustrating the structure of the power control packet determination table according to the embodiment. The power control packet determination table T includes “NO” which is a number for identifying each data, “special packet function” indicating the setting of the power supply to be controlled, “packet type” indicating the type of packet (TCP or UDP, etc.), “IP address” indicating its own IP address, “port number” indicating the port number of the UDP used for power control processing, “data size” indicating the data size of the packet data body, and data of the packet data body Has a "data value".

  For example, the special packet analysis unit 22 refers to the power control packet determination table T and checks whether the received IP packet is a packet (UDP) described in the item of “packet type”. Similarly, the special packet analysis unit 22 checks whether the destination IP address of the received IP packet matches the own IP address described in the “IP address”. Next, the special packet analysis unit 22 determines whether or not the destination port number of the received IP packet matches the port number described in the item of “port number”. The value (65500) set in the “port number” of FIG. 2 is an example, and if the port number is an undefined port number other than the so-called well-known port number, the IP switching device 1 and the EMS 60 Other port numbers may be used. Next, the special packet analyzing unit 22 checks whether or not the size of the data body of the received packet matches the value (4 bytes in FIG. 2) described in the item of “data size”. Next, the special packet analysis unit 22 checks whether the data value of the data body of the received packet matches the value (six types in FIG. 2) described in the item of “data value”. Then, when all the above comparisons match (when any of the data of NO1 to NO6 is satisfied), the special packet analysis unit 22 determines that the received IP packet is a special packet for power control, The packet is distributed to the power control unit 23. On the other hand, the special packet analysis unit 22 determines that the received IP packet is a normal packet and determines that the received IP packet is a normal packet except when the above comparisons all match, that is, when at least one comparison does not match. The packet is distributed to the internal packet IF unit 24.

  Note that the EMS 60 continuously transmits a plurality of (N) power control special packets continuously within a certain period of time. Will be analyzed. Therefore, the special packet analysis unit 22 continuously and continuously transmits M (M is a value equal to or less than N) special packets for power control of the same content within a predetermined time in order to more reliably determine that the remote power control is performed from the EMS 60. The special packet may be distributed to the power control unit 23 only when the special packet is received.

  The power control unit 23 controls the power supply unit 16 that supplies power to the control unit 15 according to the content of the special packet for power control (the special packet function in FIG. 2). For example, when the power control unit 23-1 of the first IP switch 10-1 receives a UDP packet whose data of the packet main body is (0x112220200) from the special packet analysis unit 22-1, the power control unit 23-1 According to the determination table T (FIG. 2), the power supply unit 16-1 for supplying power to the control unit 15-1 of the first IP exchange 10-1 and the control unit 15-2 of the second IP exchange 10-2 Control is performed to turn off the power supply unit 16-2 that supplies power.

(A-2) Operation of the Embodiment Next, the operation of the IP switching device 1 and the EMS 60 of the embodiment having the above configuration will be described with reference to FIGS.

  3 to 6 are sequence diagrams showing the operation (remote power control) of the IP switching device 1 and the EMS 60.

  First, here, as an initial state, as shown in FIG. 3, the first IP exchange 10-1 (control unit 15-1) operates as an ACT system (operating system), and the second IP exchange 10-2 (operation system). It is assumed that the control unit 15-2) operates as an SBY system (standby system). Hereinafter, description will be made sequentially from the sequence diagram of FIG.

  The EMS 60 sends a message (for example, ping, snmpget, or the like) to the first IP exchange 10-1 (control unit 15-1) and the second IP exchange 10-2 (control unit 15-2) to confirm the existence of the message. ) Is transmitted (S101, S103).

  The first IP exchange 10-1 (control unit 15-1) and the second IP exchange 10-2 (control unit 15-2) cannot return a response to the existence confirmation message because the software is in a suspended state ( S102, S104).

  The EMS 60 senses that a failure has occurred because there is no response from the first IP exchange 10-1 (control unit 15-1) and the second IP exchange 10-2 (control unit 15-2), and An IP packet for turning off the power of the control unit 15 (15-1, 15-2) is transmitted to the first IP exchange 10-1 (S105). The EMS 60 transmits N or more special packets for power control continuously within a predetermined time using a dedicated tool.

  The first IP switch 10-1 (NWIF unit 20-1) determines whether or not the received IP packet is a special packet for power control according to the power control packet determination table T described above (S106, S107). ). If the NWIF unit 20-1 receives M (M is a number equal to or less than N) packets within a certain period of time when the packet is a special packet for power control, the NWIF unit 20-1 turns OFF / ON the corresponding power. Perform control. In this example, since the special packet for power control is a packet corresponding to the data of NO5 in the power control packet determination table T (FIG. 2), the NWIF unit 20-1 controls the control unit 15-1 and the control unit 15-1. The power supply unit 16-1 and the power supply unit 16-2 that supply power to the unit 15-2 are controlled to be turned off.

  Subsequently, the EMS 60 sends a special packet for power control for turning on the control unit 15-1 of the first IP exchange 10-1 and the control unit 15-2 of the second IP exchange 10-2 to the first IP exchange 10-1. To the IP exchange 10-1 (S108).

  The first IP switch 10-1 (NWIF unit 20-1) determines the received IP packet and controls the power supply according to the content, as in steps S106 and S107 described above (S109 and 110). ). In this example, the NWIF unit 20-1 controls to turn on the power of the power supply unit 16-1 and the power supply unit 16-2 that supply power to the control unit 15-1 and the control unit 15-2.

  As described above, the first IP exchange 10-1 is restored as the ACT system, and the second IP exchange 10-2 is restored as the SBY system.

  Next, the sequence diagram of FIG. 4 will be described. In FIG. 4, it is assumed that the second IP exchange 10-2 (control unit 15-2) operates as an ACT system (active system). Also, it is assumed that the first IP switch 10-1 (control unit 15-1) of the SBY system (standby system) is out of control due to a software failure.

  When the second IP exchange 10-2 (control unit 15-2) detects a failure of the first IP exchange 10-1 using a watchdog timer (not shown) or the like, the first IP exchange 10-1 (control unit 15-2). The control unit 15-1) is instructed to perform a reset (S201). It is assumed that the first IP switch 10-1 (control unit 15-1) has not been restored at this point even if reset.

  The EMS 60 checks the existence of the first IP exchange 10-1 (control unit 15-1) and the second IP exchange 10-2 (control unit 15-2) in the same manner as in steps S101 and S102 described above. The message is transmitted (S202, S204).

  The first IP exchange 10-1 (the control unit 15-1) cannot return a response to the existence confirmation message because the software is in a suspended state (S203). On the other hand, the second IP exchange 10-2 (control unit 15-2) returns a response to the existence confirmation message because the software is operating normally (S205).

  The EMS 60 detects that a failure has occurred because there is no response from the first IP switch 10-1 (control unit 15-1), and controls the first IP switch 10-1 similarly to step S105 described above. A special packet for power control for turning off the power of the unit 15-1 is transmitted to the second IP exchange 10-2 (S206).

  The second IP switch 10-2 (NWIF unit 20-2) determines whether the received IP packet is a special packet for power control, as in steps S106 and S107 described above (S207). Then, since the NWIF unit 20-2 determines that the special packet for power control is a packet corresponding to the data of NO1 in the power control packet determination table T (FIG. 2), the NWIF unit 20-2 supplies the power to the control unit 15-1. Control is performed to turn off the power of the unit 16-1.

  Subsequently, the EMS 60 transmits a special packet for power control for turning on the power of the control unit 15-1 of the first IP switch 10-1 to the second IP switch 10-2 (S208).

  The second IP switch 10-2 (NWIF unit 20-2) determines the received IP packet, and controls the power supply according to the content, as in step S207 described above (S209). In this example, the NWIF unit 20-2 controls to turn on the power of the power supply unit 16-1 that supplies power to the control unit 15-1.

  As described above, the first IP switch 10-1 is restored as the SBY system.

  Next, the sequence diagram of FIG. 5 will be described. In FIG. 5, first, the first IP exchange 10-1 (control unit 15-1) is set to the ACT system (active system), and the second IP exchange 10-2 (control unit 15-2) is set to the SBY system (standby). System). However, because a software failure occurred in the first IP exchange 10-1 (control unit 15-1), the second IP exchange 10-2 (control unit 15-2) was switched to the ACT system. In such a state, even if the first IP exchange 10-1 does not recover due to the reset, the power supply of the first IP exchange 10-1 (control unit 15-1) is turned off as in FIG. By turning on / ON, the first IP switch 10-1 can be restored. Note that the processing after step S201 in FIG. 5 is the same as that in FIG. 4, and a description thereof will be omitted.

  Next, the sequence diagram of FIG. 6 will be described. In FIG. 6, first, as in FIG. 5, the first IP exchange 10-1 (control unit 15-1) is set to the ACT system (operating system) and the second IP exchange 10-2 (control unit 15-2) Operated as an SBY system (standby system). However, a software failure has occurred in the first IP exchange 10-1 (control unit 15-1), but the second IP exchange 10-2 (control unit 15-2) cannot detect the failure for some reason. , SBY system. Also, unlike FIG. 5, the second IP exchange 10-2 (control unit 15-2) cannot detect the failure of the first IP exchange 10-1 (control unit 15-1). The reset instruction cannot be given to the exchange 10-1.

  The EMS 60 checks the existence of the first IP exchange 10-1 (control unit 15-1) and the second IP exchange 10-2 (control unit 15-2) in the same manner as in steps S101 and S102 described above. The message is transmitted (S301, S303).

  The first IP switch 10-1 (control unit 15-1) cannot return a response to the existence confirmation message because the software is in a suspended state (S302). On the other hand, the second IP exchange 10-2 (control unit 15-2) returns a response to the existence confirmation message because the software is operating normally (S304).

  The EMS 60 detects that a failure has occurred because there is no response from the first IP exchange 10-1 (control unit 15-1), and controls the first IP exchange 10-1 similarly to step S105 described above. A special packet for power control for turning off the power of the unit 15-1 is transmitted to the first IP exchange 10-1 (S305).

  The first IP switch 10-1 (NWIF unit 20-1) determines whether the received IP packet is a special packet for power control, as in steps S106 and S107 described above (S306). Then, since the NWIF unit 20-1 is a packet corresponding to the NO1 data of the power control packet determination table T (FIG. 2), the NWIF unit 20-1 supplies the power to supply power to the control unit 15-1. Control is performed to turn off the power of the unit 16-1.

  Subsequently, the EMS 60 transmits a power control special packet for turning on the power of the control unit 15-1 of the first IP exchange 10-1 to the first IP exchange 10-1 (S307).

  The second IP switch 10-2 (NWIF unit 20-2) determines the received IP packet and controls the power supply according to the content, as in step S306 described above (S308). In this example, the NWIF unit 20-1 performs control to turn on the power of the power supply unit 16-1 that supplies power to the control unit 15-1.

  As described above, the first IP exchange 10-1 is restored as the ACT system.

(A-3) Effects of Embodiment According to this embodiment, the following effects can be obtained.

  In the IP switching apparatus 1, since the control unit 15 in the IP exchange 10 and the NWIF unit 20 are completely separated from each other, even if the control unit 15 becomes uncontrollable, the NWIF unit 20 is remotely controlled from the EMS 60. , The power of the control unit 15 can be efficiently controlled (OFF / ON) (the control unit 15 can be restored).

  The IP switching device 1 has a first IP switch 10-1 and a second IP switch 10-2 (redundant configuration). Then, even if the control unit 15-1 of the first IP exchange 10-1 becomes uncontrollable, not only the NWIF unit 20-1 of the first IP exchange 10-1, The power of the first IP switch 10-1 (control unit 15-1) can be turned off / on via the NWIF unit 20-2 of the second IP switch 10-2 (via the other IP switch). Recovery). In addition, the power supply control of the control units 15 of both exchanges can be performed simultaneously via one of the NWIF units 20 of the first and second IP exchanges.

  The IP switching device 1 and the EMS 60 of this embodiment do not perform power control only when a failure occurs. For example, when a redundant configuration cannot be obtained due to power shortage, the IP switching device of the SBY system is used. The power supply 10 can be used in various cases (applications) such as turning off the power supply by remote control from the EMS 60.

(B) Other Embodiments The present invention is not limited to the above embodiments, and may include modified embodiments as exemplified below.

  (B-1) In the above embodiment, an example in which the redundant communication device of the present invention is applied to an IP communication device (a device having a plurality of IP exchanges) has been described. The device is not limited to this example.

  (B-2) In the above embodiment, the single power supply unit 16 is used as the power supply to be supplied to the control unit 15 and the NWIF unit 20 of the IP exchange 10. As a modification, the IP exchange 10 may use different power supplies for the control unit 15 and the NWIF unit 20 (for example, in the IP exchange device 1 of FIG. 1, the control units 15-1 and 15-2 and the NWIF unit). Four power supply units 16 are required as power supplies corresponding to 20-1 and 20-2).

  (B-3) In the above embodiment, the power supply control target from the EMS 60 is only the power supply unit 16 that supplies power to the control unit 15. As a modified example, the power supply unit 16 that supplies power to the NWIF unit 20 may be remotely controlled from the EMS 60. For example, data indicating power control to the NWIF unit 20 is newly added to the power control packet determination table T, and the NWIF unit 20 determines a packet received from the EMS according to the power control packet determination table T, and To control the power supply to the NWIF unit 20.

  DESCRIPTION OF SYMBOLS 1 ... IP exchange apparatus, 10 (10-1, 10-2) ... IP exchange, 15 (15-1, 15-2) ... Control part, 16 (16-1, 16-2) ... Power supply part, 20 ( 20-1 and 20-2) NWIF part, 21 (21-1, 21-2) external packet IF part, 22 (22-1, 22-2) special packet analysis part, 23 (23-1, 23-2) 23-2) Power control unit, 24 Internal packet IF unit, 30 Subscriber line, 50 Subscriber terminal, 60 EMS, 70 IP network, T Power control packet determination table.

Claims (5)

In a communication system including a redundant communication device having at least one active communication device and one standby communication device, and a management device connected to the redundant communication device via a network,
The management device,
For each of the active communication device and the standby communication device, a first power control packet for controlling the power of the active communication device or the standby communication device, and the active communication device and the standby communication A second power control packet for controlling both power supplies of the device can be transmitted;
A power control packet transmitting unit that transmits any one of the first power control packet and the second power control packet,
Each of the active communication device and the standby communication device,
A power control packet receiving unit that receives the power control packet;
A power control packet analyzer for analyzing the power control packet,
If the power control packet analyzed by the power control packet analysis unit is the first power control packet, the power control packet control unit controls the power of the working communication device or the standby communication device, A power control unit for controlling the power of both the active communication device and the standby communication device when the power control packet is the second power control packet . The power control packet analysis unit determines whether the power control packet received by the power control packet receiving unit matches a predetermined condition,
The power control unit controls the power of the active communication device or the standby communication device only when the condition is satisfied, and when the power control packet is the first power control packet , The communication system according to claim 1 , wherein when the packet is the second power control packet, the power of both the active communication device and the standby communication device is controlled. The power control packet transmission unit transmits N (N is a positive integer of 2 or more) N power control packets continuously within a predetermined time,
3. The communication system according to claim 2, wherein the condition is that the power control packet receiving unit continuously receives M (M is a positive integer equal to or less than N) number of the power control packets within a predetermined time. 4. . In a redundant communication device having at least one active communication device and one standby communication device,
Each of the active communication device and the standby communication device,
A first power control packet for controlling the power of the active communication device or the standby communication device, and a second power control packet for controlling the power of both the active communication device and the standby communication device Can be received,
A power control packet receiving unit that receives any one of the first power control packet and the second power control packet transmitted from an external device ;
A power control packet analyzer for analyzing the power control packet,
If the power control packet analyzed by the power control packet analysis unit is the first power control packet, the power control packet control unit controls the power of the working communication device or the standby communication device, A power control unit for controlling the power of both the active communication device and the standby communication device when the power control packet is the second power control packet . In a communication control method for controlling a redundant communication device having at least one active communication device and at least one standby communication device, and a management device connected to the redundant communication device via a network,
A power control packet transmitting unit of the management device, for each of the active communication device and the standby communication device, a first power control for controlling the power of the active communication device or the standby communication device; Packet and a second power control packet for controlling the power of both the active communication device and the standby communication device can be transmitted, and any one of the first power control packet and the second power control packet can be transmitted. Some power control packets,
Each of the working communication device and the standby communication device,
A power control packet receiving unit receives the power control packet,
The power control packet analysis unit analyzes the power control packet,
Power control unit, the power control packets analyzed by the serial power control packet analyzing unit, when it was the first power control packet, controls the power supply of the operational system communication device or the standby communication device On the other hand, when the packet is the second power control packet, the power control of both the active communication device and the standby communication device is controlled.

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