JPH01284100A - Isdn terminal designation system - Google Patents

Isdn terminal designation system

Info

Publication number
JPH01284100A
JPH01284100A JP63111695A JP11169588A JPH01284100A JP H01284100 A JPH01284100 A JP H01284100A JP 63111695 A JP63111695 A JP 63111695A JP 11169588 A JP11169588 A JP 11169588A JP H01284100 A JPH01284100 A JP H01284100A
Authority
JP
Japan
Prior art keywords
address
isdn
terminal
branch exchange
private branch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP63111695A
Other languages
Japanese (ja)
Inventor
Takashi Matsumoto
孝 松本
Shigehiko Yazawa
重彦 矢澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP63111695A priority Critical patent/JPH01284100A/en
Publication of JPH01284100A publication Critical patent/JPH01284100A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To designate a specific ISDN terminal equipment with only an address by providing a table to a memory connected to a common controller and converting the address into an address and a subaddress based on the data on the table. CONSTITUTION:A memory 8 is provided with an address conversion table 9 corresponding to the address and the subaddress. The common controller 7 references the address conversion table 9 and has a function, for example, converting an address '5114' into an address '5112' and a subaddress '2'. When a non-ISDN terminal equipment C4 designates the address '5114' to make a call, the address '5114' of the call signal is converted into the address '5112' and a subaddress '2' by the common controller 7. As a result, even in the non-ISDN terminal equipment unable to send any address, it is possible to designate a specific ISDN terminal equipment B on the ISDN interface for the communication.

Description

【発明の詳細な説明】 〔概 要〕 構内交換機(PBX)に接続された複数のISDN端末
のうちの特定端末を指定可能にするISDN端末ISD
N端末方式に関し、 非ISDN端末から構内交換機(PBX)に接続された
複数のISDN端末のうちの特定端末の指定を可能にす
るとともに、通信相手がISDN端末か非ISDN端末
かを意識して発呼する必要性をなくするこ、とを目的と
し、 構内交換機と、構内交換機に収容されるインタフェース
装置と、インタフェース装置を通して構内交換機に接続
される複数のISDN端末と、構内交換機を制御する共
通制御装置と、共通制御装置に接続されたメモリとを備
え、 メモリに、アドレスをアドレスとサブアドレスに対応さ
せるテーブルを備え、テーブルのデータに基き、アドレ
スをアドレスとサブアドレスに変換することにより、ア
ドレスのみで特定のISDN端末を指定するように構成
する。
[Detailed Description of the Invention] [Summary] ISDN terminal ISD that makes it possible to specify a specific terminal among a plurality of ISDN terminals connected to a private branch exchange (PBX)
Regarding the N-terminal method, it is possible to specify a specific terminal from among multiple ISDN terminals connected to a private branch exchange (PBX) from a non-ISDN terminal, and it is also possible to make calls based on whether the communication partner is an ISDN terminal or a non-ISDN terminal. A private branch exchange, an interface device housed in the private branch exchange, a plurality of ISDN terminals connected to the private branch exchange through the interface device, and a common control system for controlling the private branch exchange. and a memory connected to a common control device, the memory includes a table that associates an address with an address and a subaddress, and the address is converted into an address and a subaddress based on data in the table. Configure to specify a specific ISDN terminal.

〔産業上の利用分野〕[Industrial application field]

本発明は、構内交換機(PBX)に接続された複数のI
SDN端末のうちの特定端末を指定可能にするISDN
端未指定方式に関する。
The present invention utilizes a plurality of I/O devices connected to a private branch exchange (PBX).
ISDN that allows you to specify a specific terminal among SDN terminals
Concerning the unspecified end method.

構内交換機にISDNインターフエースに準拠したイン
ターフェース装置を収容し、このインターフェース装置
を通して複数のISDN端末を構内交換機に接続して通
信を行う通信方式が開発されつつある。
A communication method is being developed in which a private branch exchange accommodates an interface device compliant with the ISDN interface, and a plurality of ISDN terminals are connected to the private branch exchange through this interface device to perform communication.

〔従来の技術〕[Conventional technology]

第5図は、ISDNインターフエースに準拠したインタ
ーフェース装置を収容した構内交換機の接続形態の一例
を示すブロック図である。同図において、10は構内交
換機(PBX)で、スイッチ20、共通制御装置30、
主記憶装置(メインソモリ)40、ISDN局線トラン
ク回路50.局線(アナログ)トランク回路60、専用
線トランク回路70、ISDNライン回路80、ライン
回路(ディジタル)90、及びライン回路(アナログ)
100を備えている。ISDN局線トランク回路50及
びISDNライン回路80に、ISDNインターフエー
スに準拠したISDNインタフエース装置である。構内
交換機10はISDNライン回路80を介して複数のI
SDN端末140に接続されている。ISDN端末14
0は基本インタフェース(BRI)の場合、1回線)こ
8台まで接続可能である。構内交換機はまた、ISDN
局線トランク回路50を介してNTTのINSネットの
ようなISDN網110 に接続され、局線(アナログ
)トランク回路60を介して公衆電話網120に接続さ
れ、専用線トランク回路70を介して私設網130に接
続され、ライン回路(ディジタル)90を介して一般電
話機のような非ISDN端末であるディジクル電話機1
50に、或いはライン回路(アナログ)100を介して
アナログ電話機160に接続されており、交倹動作によ
り相互に通信が行えるようになっている。
FIG. 5 is a block diagram showing an example of a connection form of a private branch exchange that accommodates an interface device compliant with the ISDN interface. In the figure, 10 is a private branch exchange (PBX), which includes a switch 20, a common control device 30,
Main storage device (main memory) 40, ISDN office line trunk circuit 50. Office line (analog) trunk circuit 60, leased line trunk circuit 70, ISDN line circuit 80, line circuit (digital) 90, and line circuit (analog)
It is equipped with 100. The ISDN office line trunk circuit 50 and the ISDN line circuit 80 are ISDN interface devices conforming to the ISDN interface. The private branch exchange 10 connects a plurality of I
It is connected to the SDN terminal 140. ISDN terminal 14
In the case of the basic interface (BRI), up to 8 devices can be connected (1 line). A private branch exchange is also an ISDN
It is connected to an ISDN network 110 such as NTT's INS net through a central office trunk circuit 50, to a public telephone network 120 through a central office (analog) trunk circuit 60, and to a private telephone network 120 through a private trunk circuit 70. A digital telephone 1, which is a non-ISDN terminal such as a general telephone, is connected to the network 130 via a line circuit (digital) 90.
50 or to an analog telephone 160 via a line circuit (analog) 100, and can communicate with each other through cross-operation.

第6図は従来のJSDN構内交換機及びこれに接続され
るISDN端末を示すブロック図である。一般に、IS
DN基本インタフェース(BRI)では、音声その他を
運ぶ伝送チャネル(Bチャネル)が2チヤネルと呼制御
情報などを運ぶ信号チャネル(Dチャネル)が1チヤネ
ルという構成となっており、−次群インタフェース(P
RI)では、Bチャネルが23チヤネルとDチャネルが
1チヤネルという構成になっている。いずれの場合でも
、通常、Dチャネル毎に1つのアドレスが割り当てられ
る。
FIG. 6 is a block diagram showing a conventional JSDN private branch exchange and an ISDN terminal connected thereto. In general, I.S.
The basic DN interface (BRI) has a configuration of two transmission channels (B channels) that carry voice and other signals and one channel (D channel) that carries call control information, etc.
RI) has a configuration of 23 B channels and 1 D channel. In either case, one address is typically assigned per D channel.

従って、各インタフェースに接続されている複数の端末
は同じアドレスとなる。このため、構内交換機に接続さ
れる1つの内線の複数の端末のうち特定の端末を識別す
るのに、サブアドレスが用いられる。例えば第6図にお
いて、ISDNインターフエース装置2に接続されてい
る端末Bは、アドレス°’5112″″ 、サブアドレ
ス“ 2”という情報により指定することができる。従
って、ISDNインターフエース装置2に接続されてい
る端末Aは、着アドレス”5112°″、着サブアドレ
ス゛′2″という情報を含む発呼信号を送出することに
より端末Bと通信できる。
Therefore, multiple terminals connected to each interface have the same address. Therefore, a subaddress is used to identify a specific terminal among a plurality of terminals of one extension connected to a private branch exchange. For example, in FIG. 6, terminal B connected to ISDN interface device 2 can be specified by information such as address ``5112'''' and subaddress ``2''. Therefore, terminal A connected to ISDN interface device 2 can communicate with terminal B by sending a calling signal containing information such as destination address "5112°" and destination subaddress "'2".

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

ところが、一般電話機のような非ISDN端末4(第6
図中のC)は、サブアドレスを送出できないため、IS
DNインターフエース装置2に接続されている複数の端
末3の中の1つを着信端末として指定できないという問
題がある。
However, if a non-ISDN terminal 4 (6th
C) in the figure is not possible to send subaddress, so IS
There is a problem in that one of the plurality of terminals 3 connected to the DN interface device 2 cannot be designated as the receiving terminal.

又、ISDN端末と通信する際にはアドレスとサブアド
レスを指定し1、非ISDN端末と通信する際にはサブ
アドレスを指定せずにアドレスのみを指定することにな
るため、通信相手がISDNi末か非ISDN端末であ
るかを発呼者が、常に意識する必要があす、マンマシン
インタフェース上好マシクナいという問題もある。
Also, when communicating with an ISDN terminal, the address and sub-address are specified1, and when communicating with a non-ISDN terminal, only the address is specified without specifying the sub-address, so it does not matter whether the communication partner is an ISDN terminal or a non-ISDN terminal. There is also the problem that the caller must always be aware of whether the caller is an ISDN terminal or not, and that the man-machine interface is difficult to maintain.

本発明の目的は、上述の従来における問題に鑑み、IS
DN端未指定方式において、非l5UN端末から構内交
換機(PBX)に接続された複数のISDN端末のうち
の特定端末の指定を可能にするとともに、通信相手がI
SDN端末か非ISDN端末かを意識して発呼する必要
性をなくすることにある。
In view of the above-mentioned conventional problems, an object of the present invention is to
In the DN terminal unspecified method, it is possible to specify a specific terminal among multiple ISDN terminals connected to a private branch exchange (PBX) from a non-15UN terminal, and it is also possible to specify a specific terminal among multiple ISDN terminals connected to a private branch exchange (PBX).
The purpose is to eliminate the need to make calls based on whether the terminal is an SDN terminal or a non-ISDN terminal.

〔課題を解決するだめの手段〕[Failure to solve the problem]

第1図は本発明の原理ブロック図である。 FIG. 1 is a block diagram of the principle of the present invention.

同図において、1は構内交換機、2は構内交換機1に収
容されるインクフェース装置、3はインタフエース装置
2を通して構内交換機1に接続される複数のl5LIN
端末、4は非1sDN端末、7は構内交換機1を制御す
る共通制御装置、8は共通制御装置7に接続されたメモ
リである。
In the figure, 1 is a private branch exchange, 2 is an ink face device housed in the private branch exchange 1, and 3 is a plurality of 15LINs connected to the private branch exchange 1 through the interface device 2.
Terminal 4 is a non-1sDN terminal, 7 is a common control device that controls the private branch exchange 1, and 8 is a memory connected to the common control device 7.

メモリ8に、−ドレスをアドレスとサブアドレスに対応
させるアドレス変換テーブル9を設け、テーブル9のデ
ータに基き、アドレスをアドレスとサブアドレスに変換
する処理を共通制御装置7に付与する。
The memory 8 is provided with an address conversion table 9 for associating -addresses with addresses and subaddresses, and based on the data in the table 9, the common control device 7 is given the processing of converting addresses into addresses and subaddresses.

〔作 用〕[For production]

共通制御装置7は、アドレス変換テーブル9を参照して
、例えばアドレス“’5114″′ をアドレス” 5
112 ”とサブアドレス+1211に変換する機能を
持つ。非ISDN端末(C)4がアドレス”5114″
′を指定して発呼すると、発呼信号のアドレス” 51
14 ’” が共通制御装置7によりアドレス゛’51
12”とサブアドレス“ 2″′に変換されるので、サ
ブアドレスを送出できない非ISDN端末でも、ISD
Nインタフエース上の特定ISDN端末Bを指定して通
信することが可能になる。
The common control device 7 refers to the address conversion table 9 and converts the address "'5114''' into an address" 5, for example.
112" and subaddress + 1211. Non-ISDN terminal (C) 4 has address "5114".
When you make a call by specifying ``, the address of the calling signal ``51
14 ''' is set to address '51 by the common control device 7.
12" and subaddress "2"', even non-ISDN terminals that cannot send subaddresses can use ISD
It becomes possible to specify and communicate with a specific ISDN terminal B on the N interface.

〔実施例〕〔Example〕

第2図は本発明の1実施例を示すブロック図である。一
般に、公衆電話網からの着信呼に対するサービス中で、
外部非ISDNm(公衆電話網)6のある端末からの番
号、例えば” X X X−5114”の末尾回折か、
例えば”5114”を構内交換機1が受は取り、構内交
換機1の特定の内線に着信させるダイヤルインと称する
サービスが知られている。ところが、構内交換機1が公
衆電話網6から受は取る番号にはサブアドレスは含まれ
ないため、ダイヤルインによる着信呼を特定のISDN
端末に接続することは通常できない。
FIG. 2 is a block diagram showing one embodiment of the present invention. Generally, during service for incoming calls from the public telephone network,
A number from a terminal on an external non-ISDNm (public telephone network) 6, for example, a trailing diffraction of "XXXX-5114",
For example, a service called "dial-in" is known in which the private branch exchange 1 receives and receives "5114" and the call is terminated on a specific extension of the private branch exchange 1. However, since the number that the private branch exchange 1 receives from the public telephone network 6 does not include a subaddress, incoming dial-in calls are sent to a specific ISDN.
It is usually not possible to connect to the terminal.

しかし、本発明の実施例によれば、例えば、外部非IS
DN網(公衆電話網)6のある端末からの番号の末尾の
アドレス” 5114 ”が、アドレス変換テーブル9
を参照することにより、アドレス”5112’”とサブ
アドレス112+1とにに変換されるため、これが可能
となる。
However, according to embodiments of the present invention, external non-IS
The last address "5114" of the number from a terminal in the DN network (public telephone network) 6 is in the address conversion table 9.
This is possible because by referring to , the address is converted into the address "5112'" and the subaddress 112+1.

第3図は本発明の他の実施例を示すブロック図である。FIG. 3 is a block diagram showing another embodiment of the present invention.

一般に、構内交換機のサービスには、あらかじめ登録し
ておくことにより、着信呼を他の特定の内線に自動的に
転送するサービス(可変不在転送)があるが、本発明の
実施例によれば、メモリ8aにアドレス変換テーブル9
の他に可変不在転送テーブル91も格納しておくことに
より、ISDN端末に対してもこのサービスを適用する
ことが可能となる。例えば図中の端末Cが可変不在転送
テーブル91のアドレス゛’5300’”に転送先アド
レス” 5114 ”を可変不在転送登録しておくと、
端末Aがアドレス゛’5300″′を指定して端末Cに
発呼した場合、アドレス” 5300 ”は、共通制御
装置7において、可変不在転送登録テーブル91を参照
することにより、“’5114″°に変換され、さらに
アドレス変換テーブル9によりアr゛レス” 5112
″′とサブアドレス゛2″′に変換されて、呼はISD
N端末已に着信する。
In general, private branch exchange services include a service (variable call forwarding) that automatically forwards incoming calls to another specific extension by registering in advance; however, according to an embodiment of the present invention, Address conversion table 9 in memory 8a
In addition, by storing the variable absent transfer table 91, it becomes possible to apply this service to ISDN terminals as well. For example, if terminal C in the figure registers the forwarding address "5114" to the address "5300" in the variable absentee forwarding table 91, then
When terminal A calls terminal C by specifying address ``5300'', the common control device 7 changes address ``5300'' to ``5114'' by referring to the variable absent transfer registration table 91. The address is converted and further converted into address “5112” by address conversion table 9.
``'' and subaddress ``2'', and the call is routed to the ISD
The call arrives on terminal N.

第4図は、本発明の各実施例における処理を説明するフ
ローチャートである。同図において、非ISDN端末か
らISDN端末への内線相互接続、及び非ISDN端末
からISDN端末への可変不在転送サービスの場合は、
ステップ401で共通制御装置7は着信先の番号を解析
し、ステップ402で内線番号と判明すればステップ4
05以降の処理を行う。
FIG. 4 is a flowchart illustrating processing in each embodiment of the present invention. In the figure, in the case of extension interconnection from a non-ISDN terminal to an ISDN terminal, and variable call forwarding service from a non-ISDN terminal to an ISDN terminal,
In step 401, the common control device 7 analyzes the destination number, and if it is found to be an extension number in step 402, step 4
Perform processing from 05 onwards.

公衆電話網6からISDN端末へのダイヤルイン(D 
I D)着信の場合は、ステップ403で着信番号中の
末尾の所定桁を網から受信し、ステップ404で可変不
在転送テーブル91を参照して、対応する内線番号を選
択し、ステップ405以降の処理を行う。
Dial-in from public telephone network 6 to ISDN terminal (D
ID) In the case of an incoming call, the last predetermined digit of the incoming call number is received from the network in step 403, the variable call forwarding table 91 is referred to in step 404, the corresponding extension number is selected, and the steps from step 405 onwards are performed. Perform processing.

ステップ405では被呼内線は可変不在転送を登録して
いるかを判別し、していればステップ406でb」変不
在転送登録テーブル91を参照して内線番号を転送先ア
ドレスに変換する。ステップ405又は406の後、ス
テップ407で被呼内線はISDN端末かを判別するI
SDN端末でなければ、ステップ408で被呼内線(非
ISDN端末)への着信処理を実行する。ISDN端末
であれば、ステップ409で可変不在転送テーブル91
を参照し、対応するアドレスサブアドレスを選択する。
In step 405, it is determined whether the called extension has registered variable call forwarding, and if so, in step 406, the extension number is converted to a forwarding destination address with reference to the "b" variable call forwarding registration table 91. After step 405 or 406, step 407 determines whether the called extension is an ISDN terminal.
If the terminal is not an SDN terminal, in step 408, processing for receiving a call to the called extension (non-ISDN terminal) is executed. If it is an ISDN terminal, in step 409 the variable absent forwarding table 91
and select the corresponding address sub-address.

ついで、ステップ410ですブアドレスの有無を判別し
、なければステップ411で被呼ISDN回線へのサブ
アドレスなしの着信処理を行い、ステップ412で該当
する全I S D N 端末が呼び出される。ステップ
410でサブアドレス有りと判別されれば、ステップ4
13で被呼ISDN端末へのサブアドレス有りの着信処
理を行い、ステップ414で特定のISDN端末が呼び
出される。
Next, in step 410, it is determined whether or not there is a subaddress. If not, in step 411, incoming processing is performed to the called ISDN line without a subaddress, and in step 412, all applicable ISDN terminals are called. If it is determined in step 410 that there is a subaddress, step 4
At step 13, a process of receiving a call with a subaddress to the called ISDN terminal is performed, and at step 414, a specific ISDN terminal is called.

〔発明の効果〕〔Effect of the invention〕

以上の説明から明らかなように、本発明によれば、サブ
アドレスを送出する機能を持たない一般電話機のよう?
F非ISDN端末からでも、特定のISDN端末を指定
して通信することが可能となる。また、発呼者が通信相
手がISDN端末か非ISDN端末かを意識しなければ
ならないというマンマシンインタフェース上の問題点が
無くなり、さらに、既存の構内交換機のサービスがIS
DN端末に対してもそのまま適用できるという効果があ
る。
As is clear from the above explanation, according to the present invention, it is possible to use a general telephone that does not have the function of sending subaddresses.
F Even from a non-ISDN terminal, it becomes possible to specify and communicate with a specific ISDN terminal. In addition, the problem of man-machine interface, where the caller has to be aware of whether the other party is an ISDN terminal or a non-ISDN terminal, is eliminated, and in addition, existing private branch exchange services can be
This has the advantage that it can be applied directly to DN terminals as well.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の原理ブロック図、 第2図は本発明の一実施例を示すブロック図、第3図は
本発明の他の実施例を示すブロック図、第4図は本発明
の各実施例における処理を説明するフローチャート、 第5図は本発明の背景技術である構内交換機の構成を示
すブロック図、 第6図は従来の構内交換機とこれに接続されるISDN
IW末の構成を示すブロック図である。 図において、1は構内交換機、2インターフエース装置
、3はISDN端末、4は非ISDN端末、6は外部非
ISDN網、7は共通制御装置、8はメモリ、9はアド
レス変換テーブル、91は可変不在転送テーブルである
Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram showing one embodiment of the invention, Fig. 3 is a block diagram showing another embodiment of the invention, and Fig. 4 is a block diagram showing each of the embodiments of the present invention. A flowchart explaining the processing in the embodiment, FIG. 5 is a block diagram showing the configuration of a private branch exchange which is the background art of the present invention, and FIG. 6 shows a conventional private branch exchange and an ISDN connected to it.
FIG. 2 is a block diagram showing the configuration of an IW terminal. In the figure, 1 is a private branch exchange, 2 is an interface device, 3 is an ISDN terminal, 4 is a non-ISDN terminal, 6 is an external non-ISDN network, 7 is a common control device, 8 is a memory, 9 is an address conversion table, and 91 is a variable This is a call forwarding table.

Claims (1)

【特許請求の範囲】[Claims] 1、構内交換機(1)と、該構内交換機(1)に収容さ
れるインタフェース装置(2)と、該インタフェース装
置(2)を通して該構内交換機(1)に接続される複数
のISDN端末(3)と、該構内交換機(1)を制御す
る共通制御装置(4)と、該共通制御装置(4)に接続
されたメモリ(5)とを備え、該メモリ(5)に、アド
レスをアドレスとサブアドレスに対応させるテーブルを
備え、該テーブルのデータに基き、アドレスをアドレス
とサブアドレスに変換することにより、アドレスのみで
特定のISDN端末を指定することを特徴とするISD
N端末指定方式。
1. A private branch exchange (1), an interface device (2) housed in the private branch exchange (1), and a plurality of ISDN terminals (3) connected to the private branch exchange (1) through the interface device (2). , a common control device (4) that controls the private branch exchange (1), and a memory (5) connected to the common control device (4), and the memory (5) stores addresses and sub-addresses. An ISD characterized in that a specific ISDN terminal can be specified by an address only by converting an address into an address and a subaddress based on the data in the table.
N terminal designation method.
JP63111695A 1988-05-10 1988-05-10 Isdn terminal designation system Pending JPH01284100A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63111695A JPH01284100A (en) 1988-05-10 1988-05-10 Isdn terminal designation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63111695A JPH01284100A (en) 1988-05-10 1988-05-10 Isdn terminal designation system

Publications (1)

Publication Number Publication Date
JPH01284100A true JPH01284100A (en) 1989-11-15

Family

ID=14567821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63111695A Pending JPH01284100A (en) 1988-05-10 1988-05-10 Isdn terminal designation system

Country Status (1)

Country Link
JP (1) JPH01284100A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03261298A (en) * 1990-03-09 1991-11-21 Mitsubishi Electric Corp Incoming control system for isdn terminal
JPH0549057A (en) * 1991-08-12 1993-02-26 Sharp Corp Terminal equipment management device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03261298A (en) * 1990-03-09 1991-11-21 Mitsubishi Electric Corp Incoming control system for isdn terminal
JPH0549057A (en) * 1991-08-12 1993-02-26 Sharp Corp Terminal equipment management device

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