A7 B7 437223 五、發明説明（J_ ) 先雛術： 按，目前所使用之乙太網路卡，一般可分爲10MHz(如：lOBase-T)、 ΙΟΟΜίίζ(如：100Base-TX 或 100Base-T4)或 Gigabit Ethernet 網路卡等截頃，在 該等網路卡之標準電路中，參閬第1圖所示，均配設有一 MDI介面(Medium Dependent Interface)，該等網路卡上之網路晶片即透過該MDI介面與一RJ-45接頭相連接，該RJ-45接頭再經由二對絞線(或稱雙絞線Twisted-pair Wires) 與集線器(Hub)或交換器(Switch)等網路裝置與區域網路相連接。在此種MDI 介面定義之網路卡中，該MDI介面包含一對傳送電路及一對接收電路.參閱 第2圖所示，該RJ-45插接頭之第3及ό接腳係分別與該等傳送電路相連接， 其第1及2接脚則係分別與該等接收親相連接。該等網路裝置(如:集線器或 交換器等)上所接設之RJ-45讎頭之第3及6接脚，則分別與該等網路裝置之 MDI-X介面上之一對接收電路相連接，而其第1及2接®則分別與該MDI-X 介面上之另一對傳相連接*餘二者遲該等RJ-45接頭及二對《ΕίϋΕ 常連線後，令網路卡得以透過該等網路裝置正確接收或傳送網路上之封包資 料。 按，在正常之網路運作狀態下，網路卡上之該MDI介面必須與該等網路 裝置之MDI-X介面相互配合，令二者上對應之接收及傳送電路可相互連通， 以正常接收或傅雜路上找包辦，否則•將因纖關,而令網路無 法正常運作。一般言，網18¾¾錯誤之娜’主要包含下列二種： (1) 一網路卡之MDI介面與另一網路卡之MDI介面連接錯誤； __2__ 本紙張尺度適用中國围家標枣（「NS > Λ4規格（210X297公釐〉 --------A------1T------^ ("先間請背而之.';£意事項再填ii:?本玎) 43 7223 A7 B7 _ 五、發明説明（$ ) (2) —集線器或交換器之MDI-X介面與另一集線器或交換器之MDI-X介 面連猶誤。 二種常見之錯誤連接情形中，又以第二種情形經常發生於集線器或交 換器之串接(cascade)狀態下，因此，爲避免發生錯誤連接之情形’網路製造業 者纖計及製造雜器或鄉器等網職置時’通常雜在該纖器救換器 上加設一励1介面之接頭，參閲第3圓所示，或安裝一可將MDI-X介面轉換 爲MDI介面之切換開關，參閱第4圓所示，俾該集線器或交換器得舆其它集 線器或交換器相互串接。 此獅臓麟者之觀設計，表面上似酿了纖器救麟間連接上 之問題，惟，實睽上，由於一IS網路使用者對於如何正確連接MDI介面與MDI_X 介面，並無充分之知識，故既使業者在該集線器或交換器上加裝該MDI介面 之接頭或該切換開關，仍無法有效解決網路裝置間發生連接錯誤之問題》故’ 該等傳統之網路裝置不僅常造成使用者安裝上之困擾及不便，且極易因錯誤安 裝》造成網路資料在接收及傳送上之諸多問題。 發明網要： 有鑒於前述傳統網路裝置所衍生之諸多問題，發明人乃硏究出一種可自動 偵測並切換網路對絞線上傳送及接收資料之電路及其方法，期藉由提供一種可 針對各種不同網路裝置（網卡、集線器、交換器、路由器等）間，對 赚(Twisted-pair Wires)上所傳送及接收之封包信號，自動偵測並切換對絞線 _______3_ 本紙乐尺度適中國國家標準（CNS ) Λ4規格（210/297公釐) 策 I 訂 I '線 (誚先閱讀背而之注意事項再功巧本頁) :¾.¾—部屮夾標準局妇-T-消^合竹社印5个 437223 Αν ___B7 五、發明説明（^) 上傳收難之賴及其方法，俾雛10BASE-T網路裝置之PMA賊 MDI介面間，或100BASE-T(或Gigabit Ethernet)網路裝置之PMD與MDI介 面間之該電路，可自動偵測出與該MDI介面對應相連接之二外部對絞線上’ 哪一對纖所載之》屬由外部傅來之信號’並將該MDI介面上贿鮮 外部信號之對腿，自動切換連接到PMA或PMD之接收埠，同時’關一對 纖自動切換連接到PMA或PMD之傳送埠，以省略傳删路裝g±所需識 之該MDI介面之接頭或該切換開關.降低製造成本及組裝程序，且在無需人 爲判斷之娜下，能確娜路裝置間之^^^態始終正確無誤，升網路 鄉在接餘傳送上之正確性。 今，爲能更淸楚地表達本發明之技術手glSIi作過程，茲配合附圖#-較 佳實施例，說明如下： 附圖說明= 第1圖所示乃習用網路卡與其它網路裝置間以對絞線連線之示意圖； 第2圖所示乃二習用網路裝置之MDI介面與MDI-X介面間傳送電路舆接 收電路以對絞線連線之示意圖； 第3圖所示乃習用網路裝置上藉加設一切換開關*以與另一M路裝置連線 之示意圖： 第4圖所示乃習用網路裝置上藉加設一 MDI介面，以與另一網路裝置之 MDI-X介面連線之示意圖： 第5圓所示乃在10BASE-T之網路裝置上之PMA(Physica〗 Medium __4_ 本紙张尺度適圯中國國家標率（（'NS ) Λ4規格（210X297公漦） ---------裝------訂------^ (1S先閲讀背.&之注意事項再填寫本頁) A7 43 7223 __B7 五、發明説明)A7 B7 437223 V. Description of the invention (J_) Prenatal technique: According to the Ethernet card currently used, it can generally be divided into 10MHz (such as: 10Base-T), ΙΟΟΜίίζ (such as: 100Base-TX or 100Base-T4 ) Or Gigabit Ethernet network cards, etc. In the standard circuits of these network cards, see Figure 1 below, all are equipped with an MDI interface (Medium Dependent Interface), the network on these network cards The circuit chip is connected to an RJ-45 connector through the MDI interface, and the RJ-45 connector is then connected to a hub or a switch through two twisted pairs (or twisted-pair wires). The network device is connected to a local area network. In the network card defined by this MDI interface, the MDI interface includes a pair of transmitting circuits and a pair of receiving circuits. As shown in Figure 2, the 3 and 6 pins of the RJ-45 plug connector are respectively connected with the When the transmission circuit is connected, the first and second pins are respectively connected to the receiving parents. The 3rd and 6th pins of the RJ-45 gimmicks connected to these network devices (such as hubs or switches, etc.) are received by one pair of MDI-X interfaces of these network devices. The circuit is connected, and its 1st and 2nd connections are connected to another pair of phase connections on the MDI-X interface respectively. The remaining two are later than the RJ-45 connector and the two pairs of “ΕίϋΕ”. Luca is able to correctly receive or transmit packet data on the network through these network devices. Press, under normal network operation status, the MDI interface on the network card must cooperate with the MDI-X interface of these network devices, so that the corresponding receiving and transmitting circuits on the two can communicate with each other, so that Receiving or Fu Zai find an arrangement on the road, otherwise • the network will not work properly due to fiber shutdown. Generally speaking, the error of network 18¾¾ includes the following two types: (1) The MDI interface of one network card and the MDI interface of another network card are incorrectly connected; __2__ This paper standard applies to the Chinese family standard date ("NS > Λ4 specification (210X297 mm) -------- A ------ 1T ------ ^ (" Please back it up first. '; Please fill in the matters of interest ii :? Ben 玎) 43 7223 A7 B7 _ V. Description of the invention ($) (2)-The MDI-X interface of the hub or switch is still mistaken with the MDI-X interface of another hub or switch. Two common types In the case of incorrect connection, the second situation often occurs in the cascade state of the hub or switch. Therefore, in order to avoid the situation of incorrect connection, the network manufacturer's fiber manufacturing and manufacturing of miscellaneous devices or local devices When waiting for the position of the network, it is usually mixed with a fiber 1 interface connector on the fiber converter, refer to the third circle, or install a switch that can convert the MDI-X interface to the MDI interface. Referring to the fourth circle, the hub or switch may be connected to other hubs or switches in series. This Griffin design looks like a fiber device on the surface. However, in fact, since an IS network user does not have sufficient knowledge on how to properly connect the MDI interface and the MDI_X interface, even if the industry installs the hub or switch The connector of the MDI interface or the switch still cannot effectively solve the problem of connection errors between network devices. Therefore, these traditional network devices not only often cause troubles and inconveniences to users, but they are also easy to install due to errors. ”Causes many problems in the reception and transmission of network data. The invention of the network: In view of the many problems derived from the aforementioned traditional network devices, the inventor has developed a method that can automatically detect and switch the transmission of network twisted pairs. And a circuit and method for receiving data, by providing a packet signal that can be transmitted and received on Twisted-pair Wires for a variety of different network devices (network cards, hubs, switches, routers, etc.) , Automatically detect and switch the twisted pair _______3_ The paper scale is suitable for the Chinese National Standard (CNS) Λ4 specification (210/297 mm) Policy I Order I 'line (read first and read (Notes on this page): ¾.¾—Minimum folder standard bureau woman-T-elimination ^ Hezhu Club printed 5 437223 Αν ___B7 V. Description of the invention (^) How to upload and receive difficulties and methods, 俾The circuit between the PMA thief MDI interface of the 10BASE-T network device or the PMD and MDI interface of the 100BASE-T (or Gigabit Ethernet) network device can automatically detect the connection corresponding to the MDI interface. On the external twisted pair, 'Which pair of fibers' is the signal from an external Fu', and the pair of external signals on the MDI interface is automatically switched to the receiving port of the PMA or PMD. The fiber is automatically switched to the PMA or PMD transmission port to omit the connector or the switch of the MDI interface required for transmission and installation. It reduces the manufacturing cost and assembly process, and does not require human judgment. In this way, we can confirm that the ^^^ state between the devices is always correct. Now, in order to express the technical process of the present invention more clearly, it will be described with reference to the accompanying drawing #--the preferred embodiment, as follows: Description of the drawing = Figure 1 shows a conventional network card and other networks Schematic diagram of twisted pair connection between devices; Figure 2 is a schematic diagram of twisted pair connection between the transmission circuit and the receiving circuit between the MDI interface and MDI-X interface of two conventional network devices; Schematic diagram of borrowing an additional switch * on a conventional network device to connect to another M-channel device: Figure 4 shows an borrowing of an MDI interface on a conventional network device to communicate with another network device. Schematic diagram of the MDI-X interface connection: The fifth circle shows the PMA (Physica〗 Medium __4_ on a 10BASE-T network device. This paper is suitable for the Chinese national standard (('NS) Λ4 specification (210X297 (Public note) --------- install ------ order ------ ^ (1S first read the back. &Amp; notes before filling out this page) A7 43 7223 __B7 V. Invention Description)
Attachment)與MDI介面，間加設本發明之自動進行偵測及切換驅之架構示 蒽圖· -ό圖所示乃在1⑽BASE-T或Gigabit Ethernet之網路裝匱上之PMD (Physica丨Medium Dependent)與MDI介面間，加設本發明之自動進行偵測及 切換電路之架構示意圖： 第7圖所示乃本發明之自動進行偵測及切換電路之硬體方塊示意圖： 第8圖所示乃本發明之自動進行偵測及切換電路中之類比交換單元在A-Type狀態下之作動^意圖； 第9圓所示乃本發明之自動進行偵測及切換電路中之類比交換單元在B-Attachment) and MDI interface, the structure of the automatic detection and switch driver of the present invention is added between them. The figure shows the PMD (Physica 丨 Medium) on the network installation of 1⑽BASE-T or Gigabit Ethernet. Dependent) and MDI interface, add the schematic diagram of the automatic detection and switching circuit of the present invention: Figure 7 shows the hardware block diagram of the automatic detection and switching circuit of the present invention: Figure 8 shows It is the intention of the analog switching unit in the automatic detection and switching circuit of the present invention in the A-Type state. ^ Intention shown in circle 9 is the analog switching unit in the automatic detection and switching circuit of the present invention in B. -
Type狀態下之作動示意圖： 第10圖所示乃本發明之自動進行偵測及切換電路中之控制電路單元之控 制流程示意圖。 詳細說明： 本發明乃一種可針對網路裝置(如:網路卡、態器、交麟、路由器·· · 等）間，對絞線(Twisted-pair Wires)上所傳送及接收之封包信號，自動進行偵 測及切換之電路設計•該電路係設於網路裝置之實體層與MDI介面間，本發 明中所稱之該實體層，在10BASE-T之網路裝置上，係指其PMA(PhySical Medium Attachment)，參閱第 5 圖所示，在 100BASE-T 或 Gigabit Ethernet 之 網路裝置上，係指其PMD(Physical Medium Dependent) ’參閲第6圖所示，該 ______ 5 本紙悵尺度適/1]中國围家標隼（（；^5),\4規格（210/297公釐) " ~ ---------裝------訂------冰 (誚先閱讀背面之注意事項再填寫本頁) 經冶部中央梂準局so：工消f含作社印y 43 7223 at ____B7_ 五、發明説明（0 ) 用以自動偵測該等網路裝置之MDI介面上與外部ms：二對纖中， 哪一對絞線上載有由外部傳來之信猇，娜載織信號㈣一對纖自動切換 連接到其實體層之接收端，同時，將另一對絞線連接到實體厝之傳送端，以達 到自動切換之目的。 本發明之電路設計，主要包括一類比交換單元、一接收信號偵測單元及一 控制電路等三大部份，參閱第7圖所示’其中該類比交換單元係分別與該接收 信號偵測單元、該控制電路及網路裝置上之MDI介面及實體層相連接’該類 比交換單元係一高頻寬之類比式交換電路，該交換電路可根據該控制電路傳來 之選擇信號，切換其內部電路之連接方式，以將網路裝置之實體層上負責傳送 與接收信號之二信號線Tx、Rx，與網路裝置之MDI介面上與外部連線之二對 絞線ICH、1〇2做平行或交叉《之切換。 在本發明中，該類比交換單元中內部連接之切換程序有二，首先·在本發 明之電路被啓動時，該類比交換單元將根據診避制電路所傳來之選擇訊號，先 選擇至A type連接狀態，令該MDI介面上與外部連線之二對絞線取、1〇2， 分別與寅體層上之二信號線Tx、Rx相連接，參閱第8圖所示，俟一預定時間 內，若該類比交換單元仍接收到該信號偵測單元傅來|線上有外部信號存在* 之信號時，則該類比交換單元將維持在A-type之連接狀態，嗣，該信號偵測單 元將在每隔一預定時間內，繼績對該二對絞線lOi、1〇2進行偵測，以判斷是否 有外部傳來之信號：若在'A-type連接，狀態下，該信號偵測單元在一預定時 間內，未偵測到外部傳來之信號，則該類比交換單元即切換至W-type連接# ____6_ 本紙張尺度適川中國囤家標準（rNS ) Λ4規格（2】0X297公釐） ------ I -----4f^ - I ^^1 n ^1.---- ^, n _ .. . 1^1 S Λ (釣先閱讀背面之注意事項再硝{:il本页) A7 B7 43 7223 五、發明説明（(）） 狀態•令該MDI介面上與外部連線之二對絞線I02，灿，分別與實體層上之 二信號線Tx ' Rx相連接，參閱第9圖所示。 在本發明中，該接收信號偵測單元係用以偵測該網路裝置之MDI介面 上，與外部連線之二對絞線1〇1、1〇2上，哪一讎上載有由外部連線之對絞線 所傅來之封包信號，當該類比交換單元之內部切換係處於a type連結狀態時， 該接收信號偵測單元係偵測i〇2線上所傳來之信號：當處於b type連結狀態 時，則偵測丨線上所傅粒信猇•而該接收信號偵測單元對取或1〇2線上 是否有信號存在之判斷，則係以信號之轉態或變化來判定：若t有信號存在，， 則產生一訊號値爲1之接收致能訊號(Receive-Active)，並將該訊號傳送至該控 制電路’若、無信號存在，，則令該接收致能訊號等於〇，該控制電路再根據 由該訊號値，以判斷織比交換單元中連線狀態之切換選擇· 在本發明中，該控制電路單元係甩以控制該類比交換單元與該信號接收偵 測單元間之交互運作，其控制流程，參閱第10圖所示，係在本發明之電路被 麵時》該控制舰單元將令該類比交網元先選擇至A-type連接狀態.俟一 預定時間tl內，若^制《^單元接收到該接收信號偵測單元傳來之|線上有 信號存在'之訊息，則令該類比交換單元仍維持在A-type連接狀態，並令該接 收信號偵測單元每隔一預定時間t2 ,檢査一次線上是否有信號存在，以做爲停 留在此^態之依據》若該接收信號偵測單元在一預定時間內，並未收到信號， 則離制跳單元將發出一選擇訊號，令該類比交鮮元切艇'Β-type連接’ 狀態· 本紙烺尺度適用中國國家標卑_( (，NS ) Λ4規格（210X 297公釐） n . i_ ^^1 . . 1^1 m .: r^i u 士卜 _ 11-- 1-11 . - :- —m ! 1........ : . - - ，vsvv (誚先閱讀背而之注意事項再"巧本頁) 437223 A7 B7五、發明説明（7) 同理，該控制電路單元令該類比交換單元選擇切換至B-type連接狀態 後，俟一預定時間t3內，若該控制電路單元接收到該接收信號偵測單元傳來之 ，線上有信號存在〃之訊息*則令該類比交換單元仍維持在B_type連接狀態， 並令該接收信號偵測單元每隔一預定時間料，檢査—次線上是否有信號存在， 以做爲停留在此狀態之依據。若該接收信號偵測單元在一預定時間內未收到信 號*則該控制電路單元將發出一選擇訊號，令該類比交換單元再切換回 'A-type 膨狀態 另，麵制電路單元設有一計時器，該計時器係用以設定每一狀態之預定 等待時間，該時間長度最短係以娜ASE-T NLP之最大間隔爲底限，最長以所 期望之性能要求(performance)爲依據，故前述tl、t2、t3及t4等預定等待之時 間係可爲介於24微秒至1秒間之任意値，此外，爲避免二個具有本發明之電 路設計之網路裝置，被連接在一起時，可能造成之錯誤動作，本發明中亦可藉 由設定不同之該tl、t2、t3及t4等預定時間値，以有效避免此一問題之發生。 以上所述，僅係本發明之一較佳之實施例，惟，本發明所主張之權利範圍· 並不局限於此，按凡熟悉該項技藝人士，依據本發明所揭露之技術內容，可輕 易思及之等效變化，均應屬不脫離本發明之保護範嗔。 ---------裝-------訂------\ (請先閱讀背面之注意事項再填艿本莨) 8 本紙張尺度適中國园家標华（) Λ4規格（210X 297公釐）Schematic diagram of the operation in the Type state: Figure 10 shows the control flow of the control circuit unit in the automatic detection and switching circuit of the present invention. Detailed description: The present invention is a packet signal that can be transmitted and received on twisted-pair wires for network devices (such as: network cards, routers, routers, routers, etc.). Circuit design for automatic detection and switching. The circuit is located between the physical layer of the network device and the MDI interface. The physical layer referred to in the present invention refers to the 10BASE-T network device. PMA (PhySical Medium Attachment), refer to Figure 5, on a 100BASE-T or Gigabit Ethernet network device, refer to its PMD (Physical Medium Dependent) 'Refer to Figure 6, which ______ 5 papers怅 Scale appropriate / 1] Chinese Wei family standard ((; ^ 5), \ 4 specifications (210/297 mm) " ~ --------- 装 -------- Order-- ---- Bing (诮 Please read the precautions on the back before filling in this page) Central Bureau of Standards and Commerce of the Ministry of Economic and Metallurgical Industry So: Industrial Consumers f Included as the company's seal y 43 7223 at ____B7_ 5. Description of the invention (0) for automatic detection Measure the MDI interface of these network devices and the external ms: which of the two pairs of fibers carry the letter from the outside, and the signal is automatically switched on the pair of fibers. It is connected to the receiving end of its physical layer, and at the same time, another pair of twisted pairs is connected to the transmitting end of the physical frame to achieve the purpose of automatic switching. The circuit design of the present invention mainly includes an analog switch unit and a received signal detection The unit and a control circuit are shown in Figure 7. 'The analog switch unit is connected to the receiving signal detection unit, the control circuit, and the MDI interface and physical layer on the network device'. The analog switching unit is a high-frequency analog switching circuit. The switching circuit can switch the connection mode of its internal circuit according to the selection signal transmitted from the control circuit, so as to transmit and receive signals on the physical layer of the network device. The two signal lines Tx and Rx are switched in parallel or crossover with the two pairs of twisted pairs ICH and 102 connected to the external connection of the MDI interface of the network device. In the present invention, the internally connected analog switch unit There are two switching procedures. First, when the circuit of the present invention is started, the analog switching unit will first select the A type connection according to the selection signal transmitted from the diagnosis avoidance circuit. State, the two pairs of twisted wires on the MDI interface and the external connection are taken as 10 and connected to the two signal wires Tx and Rx on the body layer respectively. Refer to Figure 8 for a predetermined time. If the analog switch unit still receives the signal detection unit Fu Lai | there is an external signal on the line * signal, then the analog switch unit will remain in the A-type connection state. Alas, the signal detection unit will be in Every two predetermined times, the two pairs of twisted pairs 10i and 102 are inspected to determine whether there is an external signal: if the signal is in the 'A-type connection' state, the signal detection unit Within a predetermined time, if no external signal is detected, the analog switching unit will switch to W-type connection # ____6_ This paper is suitable for Sichuan China Store Standard (rNS) Λ4 specification (2) 0X297 mm ) ------ I ----- 4f ^-I ^^ 1 n ^ 1 .---- ^, n _ ... 1 ^ 1 S Λ (Read the precautions on the back before fishing (: This page) A7 B7 43 7223 V. Description of the invention (()) Status • Make the two pairs of twisted wires I02 and Can on the MDI interface and external, respectively, and two letters on the physical layer. Line Tx 'Rx is connected, see section 9 shown in FIG. In the present invention, the received signal detection unit is used to detect the two pairs of twisted wires 101 and 102 connected to the MDI interface of the network device and externally, which one is externally loaded. For the packet signal from the connected twisted pair, when the internal switching of the analog switching unit is in the a type connection state, the received signal detection unit detects the signal transmitted on the i02 line: when the When the b type is connected, it will detect all the signals on the line. The judgment of the received signal detection unit on whether there is a signal on the line or 102 is based on the signal's transition or change: If a signal exists at t, a receive-active signal (Receive-Active) with a signal of 1 is generated, and the signal is transmitted to the control circuit. If no signal exists, the receive-enable signal is made equal to 〇, the control circuit is based on the signal 値 to determine the switching state of the connection ratio in the weaving exchange unit. In the present invention, the control circuit unit is controlled to control the analog exchange unit and the signal receiving detection unit. Interactive operation As shown in Figure 10, when the circuit of the present invention is covered, the control ship unit will make the analog network element select the A-type connection state first. Within a predetermined time t1, if the "^ unit After receiving the message that there is a signal on the line from the received signal detection unit, the analog exchange unit is still maintained in the A-type connection state, and the received signal detection unit is kept at a predetermined time t2, Check if a signal exists on the line as a basis for staying in this state. If the received signal detection unit does not receive the signal within a predetermined time, the skip unit will issue a selection signal, so that The state of this analog fresh-cut boat 'B-type connection' · The size of the paper is applicable to the Chinese national standard _ ((, NS) Λ4 specification (210X 297 mm) n. I_ ^^ 1.. 1 ^ 1 m. : r ^ iu 士卜 _ 11-- 1-11.-:-—m! 1 ........:.--， vsvv (诮 read the precautions before reading " clever page ) 437223 A7 B7 V. Description of the invention (7) In the same way, the control circuit unit selects the analog switch unit to switch to the B-type connection state. Within time t3, if the control circuit unit receives a signal from the receiving signal detection unit and there is a signal on the line *, the analog switch unit is still maintained in the B_type connection state, and the received signal detection unit is caused Every predetermined time, check whether a signal exists on the secondary line as a basis to stay in this state. If the received signal detection unit does not receive a signal within a predetermined time *, the control circuit unit will issue A selection signal causes the analog switching unit to switch back to the 'A-type inflated state. In addition, the surface circuit unit is provided with a timer. The timer is used to set the predetermined waiting time for each state. The shortest time is The maximum interval of Na-ASE-T NLP is the bottom limit, and the longest is based on the expected performance requirements. Therefore, the aforementioned tl, t2, t3, and t4 predetermined waiting times can be between 24 microseconds and 1 second. In addition, in order to prevent two network devices with the circuit design of the present invention from being connected together, they may cause erroneous actions. In the present invention, it is also possible to set different The tl, t2, t3, and t4 are predetermined times, so as to effectively avoid this problem. The above is only one of the preferred embodiments of the present invention, but the scope of the rights claimed by the present invention is not limited to this. According to the technical content disclosed by the person skilled in the art, it can be easily All equivalent changes considered shall be within the scope of protection of the present invention. --------- Installation ------- Order ------ \ (Please read the notes on the back before filling in this book) 8 This paper is suitable for Chinese garden home standard Chinese ( ) Λ4 specification (210X 297 mm)