JPS5840968A - Power supply applying system - Google Patents
Power supply applying systemInfo
- Publication number
- JPS5840968A JPS5840968A JP13914381A JP13914381A JPS5840968A JP S5840968 A JPS5840968 A JP S5840968A JP 13914381 A JP13914381 A JP 13914381A JP 13914381 A JP13914381 A JP 13914381A JP S5840968 A JPS5840968 A JP S5840968A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- information
- power
- fed
- parts
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、電話交換局等から給wtf:受けて動作する
端末制御装置における電源供給方式に関する4のである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply system in a terminal control device that operates by receiving power from a telephone exchange or the like.
最近の半導体技術の進歩にと4ない電話交換システムに
おいて、通信情報・制御情報のディジタル制御ICLS
I(大集積回路)等が大巾に導入されつつある。そして
加入者電話機が接tI&1れる加入者線がディジタル制
御化されると、通常の通話情報を送受する電話M&能に
加えて、加入者*1利用してデータ端末等を接続し通話
情報以外のデータ情報の送受を行なう各種非電話機能【
提供す石ことが可能となる。これら電話M&能能。電話
機能の複合通信機能、さらには各種のサービス(例えば
ボタン電話機能)が提供できる高rな電話機能を含めた
端末制御装置を交換局からの加入者回線に接続し通信サ
ービスの向上電図ることが行なわれている。しかし端末
制御装置?全電子化(ディジタル化)すると局電源から
の供給だけでは端末制御装置やこの端末制御装置に接続
される内線加入者電話機等を動作させ為ことは消費電力
の点で難かしい。を九局から給iE【受けていないとき
に亀内曽相互通話醇が行なわれることを考えると、局給
電と端末lI独自の電源(例えば商用電源やバラチリ−
等)とt併用すゐことが必要となる。In line with recent advances in semiconductor technology, digital control ICLS for communication and control information is now available in telephone switching systems.
I (large integrated circuit) etc. are being widely introduced. Then, when the subscriber line to which the subscriber's telephone is connected was digitally controlled, in addition to the telephone M& function that sends and receives normal call information, the subscriber *1 was used to connect data terminals, etc. Various non-telephone functions for sending and receiving data information [
It becomes possible to provide stones. These phones M&N. To improve communication services by connecting a terminal control device with a high-resolution telephone function capable of providing multiple telephone functions and various services (for example, a button telephone function) to a subscriber line from an exchange. is being carried out. But a terminal controller? When going all electronic (digital), it is difficult in terms of power consumption to operate the terminal control device and the extension subscriber telephones connected to the terminal control device using only the supply from the station power supply. Considering that mutual communication is performed when the iE is not being received from the nine stations, it is necessary to connect the station power supply and the terminal's own power source (for example, commercial power supply or
etc.) and t must be used together.
本発明の目的は、通信情報尋がディジタル情報として送
受され為端末制御装置等への給電方式に係〕特に電話交
換の基本機能(局線から〆への発着信通話)が局給電で
実現されるような通信システムにおけ1局からの電源と
端末装置側の独立した電源とを併用した全く新しい電源
供給方式によ〕非電話通信(通話情報以外の通信)及び
内線通信サービスを提供可能とし、且つ局電源の消費電
力を減少することKある。The object of the present invention is to provide power to terminal control devices, etc., in which communication information is transmitted and received as digital information.In particular, the basic functions of telephone exchanges (calls made and received from the central office line to the terminal) are realized by central office power supply. By using a completely new power supply method that combines the power supply from one station and the independent power supply on the terminal device side in communication systems such as , and reduce the power consumption of the local power supply.
上記目的を達成するために、本実F!Aは局線及び内1
1!!を収容する端末制御装置において、前記局線から
送られてくる情報から分離抽出した電源と、前記端末制
御装置側で独立に供給する電源との共用化部をもち、前
記端末制御装置の各部へ電源供給を行なうことを特徴と
すゐ。In order to achieve the above objectives, Honjitsu F! A is central line and inner 1
1! ! In the terminal control device that accommodates the terminal control device, the power source is separated and extracted from the information sent from the central office line, and the power source is independently supplied on the terminal control device side. It is characterized by supplying power.
本発明の着眼点は、現行のボタン電話等のサービス条件
上考慮し、端末装置側の電源が停電等によ)供給されな
くなっても、局線に対する電話基本機能(発着信通話機
能)t−保障することである。The point of view of the present invention is to take into account the service conditions of current key telephones, etc., and even if power is not supplied to the terminal device side due to a power outage, etc., the basic telephone functions (outgoing and incoming call functions) for the central office line can be maintained. It is to guarantee.
従つて付加的機能(発呼者の番号表示、内線相互通話等
)や非電話通信機能は停電時は動作させない。この局#
を用いた電話基本機能の保障は、(1)通信中の停電働
再通電に対しては全ての内線電話機について通話を保持
し、(2)停電中の発着信は特定の電話機で行なうこと
によ1実現される。Therefore, additional functions (caller number display, inter-extension communication, etc.) and non-telephone communication functions do not operate during a power outage. This station #
Guarantees basic telephone functions using (1) all extension telephones will hold calls in the event of a power outage and power re-energization during communication, and (2) calls will be made and received using a specific telephone during a power outage. It will be realized.
以下本発明を実施例を用いて詳細に説明する。The present invention will be explained in detail below using examples.
第1図は本実@に係る端末制御装置の構成図、第2図は
その端末制御装置に接続される内線加入者電話機の構成
図、llis図は第1図の端末制御装置の電源起動部の
構成図である。図中共通に用いている符号は同一物を示
す。Fig. 1 is a block diagram of the terminal control device according to the present invention, Fig. 2 is a block diagram of an extension subscriber telephone connected to the terminal control device, and Fig. FIG. Reference numerals commonly used in the figures indicate the same thing.
H1図において、L謳+ L@ + L @ ’ +
Lm′け局線と接続され、STA各内線電話機、その端
末が接続されることを示す、DSE、、DSK、け電源
分離部、DCNTl、DCNテ、Fi伝送制御部であり
、等什器EQL、yレーム同期回路FSY、り四ツクを
抽出すゐ同期回路C等から成fi、COMは共通部で、
局線−内線の方路切替の九めのスイッチSSW、交換I
I(局)及び内線電話機との発信、着信、ダイヤル数字
受信等の信号を制御管理する信号処理部PCNT、各部
ヘタイイング信号を供給す石メイ々ング発生1iTG尋
から底シ、8CNT、。In the H1 diagram, L Uta + L @ + L @ ' +
DSE, DSK, power supply separation section, DCNTl, DCNTl, Fi transmission control section, etc., which are connected to the Lm' central office line and indicate that the STA extension telephones and their terminals are connected. It consists of a frame synchronization circuit FSY, a synchronization circuit C that extracts four blocks, etc., and COM is a common part.
Ninth switch SSW for switching between central office line and extension line, exchange I
The signal processing unit PCNT controls and manages signals such as outgoing calls, incoming calls, and dialed digit reception with I (office) and extension telephones, and the stone meing generation unit 1iTG, 8CNT, which supplies tying signals to each part.
5CNTIは内線制御部で、フレーム同期回路FS。5CNTI is an extension control unit and a frame synchronization circuit FS.
フレーム組立回路FC,ドライバ・レシーバ回路DR@
から成り、 DD、、 DD雪は電源1畳部、Pl。Frame assembly circuit FC, driver/receiver circuit DR@
It consists of DD,, DD snow is the power supply 1 tatami section, Pl.
源部(本実施ガでは商用電源ムC件9つV供給【示す)
、D0〜D、はダイオード、cswI′i端末装置it
#独立の[源断を検出する検出回路でToシ、d。Power source (in this implementation, 9 commercial power supply units (V supply) [shown])
, D0-D are diodes, cswI'i terminal device it
#Independent detection circuit for detecting power failure, d.
〜d・、dll* (iHは電源系、C1〜C4F1劇
御系【示す。(尚本夾施例では、局!2本、内線2本の
例で説明するが、これに限られないことは言うまでもな
い。)
まず、端末制御装置全体の動作を説明すると、局から送
られてくる情報Fi電源分離部で、asg+DSE、で
、wmと制御情報、通話情報とに分離される。さらに制
御情報、通話情報は伝送制御部DCNT、、章 におい
て尋化’aBQLを介して、ビ、ト同期回路Cよシフ冒
ツク成分を抽出し、フレーム同期回路FSYで通話情報
と制御情報を取フ出し、制御情報は共通部COMの信号
処理部PCNTへ、通話情報は信号処理部PCNTにょ
り指定された内縁へ接続されゐように駆動されるスイッ
チ部SWへ送られる。~d・, dll* (iH is the power supply system, C1 to C4F1 is the drama system. (In this example, we will explain using an example of 2 stations and 2 extensions, but it is not limited to this. (Needless to say.) First, to explain the operation of the entire terminal control device, the information sent from the station is separated into WM, control information, and call information at the Fi power separation section at the ASG+DSE.Furthermore, the control information is , the call information is transmitted to the transmission control unit DCNT through the aBQL, the bit synchronization circuit C extracts the shifting component, and the frame synchronization circuit FSY extracts the call information and control information. The control information is sent to the signal processing section PCNT of the common section COM, and the call information is sent to the switch section SW, which is driven by the signal processing section PCNT so as to be connected to the specified inner edge.
内線制御1111部5CNT+、sでは、通話情報を7
レームに組立ててドライバ・レシーバ回路DRi制御し
、電源重畳部DD、、、で電源情報を重畳して内線へ送
る一方内線からの情報をドライバ・レシーバ回路DRで
受は取シ、フレーム同期をと力通話情報はスイッチ部S
Wへ、信号情報は信号処理部PCNTへ送る。即ち本発
明に係る交換局と内線との間の情報のやりとりは通称ピ
ンポン伝送と呼ばれる、送信、受信をビット同期を取り
ながら交互に7レ一ム同期方式で行なわれる。In extension control 1111 section 5CNT+, s, call information is 7
The driver/receiver circuit DRi is assembled into a frame and the driver/receiver circuit DRi is controlled, and the power superimposing section DD, ... superimposes power information and sends it to the extension, while the information from the extension is received by the driver/receiver circuit DR, and frame synchronization is performed. For power call information, switch section S
W, the signal information is sent to the signal processing unit PCNT. That is, the exchange of information between the exchange and the extension according to the present invention is carried out in a 7-rem synchronization system, commonly called ping-pong transmission, in which transmission and reception are alternately performed while maintaining bit synchronization.
−1本発明の電源供給は、電源分離部DSE+、*よ〕
抽出した電源情報は電源起動部P1+1から各伝送制御
II DCNTl 1へ送られるとともに1ダイオード
D+ −D* を介し、電源DENからの電源とをダイ
オード出力のオアをとり共通部COM、内線制御部BC
NT、、い電源重畳[DD、、DD鵞へ送られ為。-1 The power supply of the present invention is provided by the power supply separation unit DSE+,*
The extracted power supply information is sent from the power supply starting unit P1+1 to each transmission control II DCNTl 1, and is also sent to the common unit COM and the extension control unit BC by ORing the diode output with the power source from the power source DEN via one diode D+ -D*.
NT,, the power supply is superimposed [DD,, it is sent to the DD fox.
次に端末制御装置に接続される内線電話機の構成を票2
図によって説明す為、電源分離部DD■で内部で必要な
電圧に変換する定電圧電源部DD、。Next, check the configuration of the extension telephone connected to the terminal control device in form 2.
In order to explain with the diagram, a constant voltage power supply section DD is converted into a necessary voltage internally by a power supply separation section DD■.
K供給する電源と、ドライバ・レシーバ回路DRC1フ
レー同期・組立部F1タイミング発生部TGC。K and the driver/receiver circuit DRC1 frame synchronization/assembly unit F1 timing generation unit TGC.
音声部T1電話人出力制御部DIOCへ供給される情報
とに分離される。局からの受信情報側はフレーム同期に
より抽出し音声情報はコープイック・アンプ等から成る
音声部Tでアナログ情報化され・・ンドセソトHへ送ら
れ、その他電話番号情報等は電話人出力制御部DIOC
t介してディスプレイDSPに表示される。局への送信
情報のうち、発呼はフックスイッチH8のオンによフ、
ダイヤル情報はキーKによシ、電源入出力制御部DIO
Cを介し、音声はハンドセットHから音声部でディジタ
ル化され、フレーム同期・組立部でフレームに組立てら
れて端末制御装置へ送られる。The voice section T1 is separated from the information supplied to the telephone output control section DIOC. The received information from the station is extracted by frame synchronization, and the audio information is converted into analog information by the audio section T consisting of a copic amplifier, etc. and sent to Ndo Sesoto H, and other telephone number information etc. is sent to the telephone output control section DIOC.
t is displayed on the display DSP. Among the information sent to the station, calls are made by turning on the hook switch H8.
Dial information is entered by key K, power input/output control unit DIO
The audio from the handset H is digitized by the audio section via C, assembled into frames by the frame synchronization and assembly section, and sent to the terminal controller.
非電話機端末TNは非電話機端末制御部Tl0Cに接続
されフレーム同期・組立部との情報のやシと−クを行な
う。尚非電話端末制御部は独立の電源部TDENから電
源供給される。The non-telephone terminal TN is connected to the non-telephone terminal control section T10C and performs information searching with the frame synchronization/assembly section. Note that the non-telephone terminal control section is supplied with power from an independent power supply section TDEN.
次に本発明の電源供給方式をさらに第3図を用いて詳細
に説明する。第3図の電源起動部は、第1図の電源起動
部P+(Pz)’を詳細に示したもので、ム、1.直*
(da) −Cs(Cm )がそれぞれ対応してい為。Next, the power supply system of the present invention will be further explained in detail with reference to FIG. The power source starting section in FIG. 3 is a detailed illustration of the power source starting section P+(Pz)' in FIG. 1. straight*
(da) -Cs(Cm) correspond to each other.
館3図において、DDは定電圧電源部bDI・〜D11
はダイオードTはトランジスIであJ、88Tムd4I
定の内縁電話機で後述するように停電時に発着信可能と
す為電話機でTo為、スイ、f91は第1IIの電源断
検出回路DETにて電源断が検出されると駆II(オy
)される。まず(商用)電源DEC)JTが通電時O動
作を説明する。局線からの発着信が金(ないとき、即ち
局から電源が供給されて%A&いときでもダイオードブ
リッジして端末制御値to共通部各内融制御部、内線電
話機の非電話端末制御部を除(各部に電源が供給されて
いる。In Figure 3, DD is the constant voltage power supply unit bDI・~D11
is diode T is transistor I, J, 88Tmu d4I
In order to be able to make and receive calls in the event of a power outage, as will be described later on a fixed common telephone, the telephone will be able to make and receive calls during a power outage.When a power outage is detected by the power outage detection circuit DET,
) to be done. First, we will explain the O operation when the (commercial) power source DEC) JT is energized. Even when there is no call originating or receiving from the central office line (that is, when power is not supplied from the central office), a diode bridge is used to convert the terminal control value to the common section, each internal control section, and the non-telephone terminal control section of the extension telephone. (Power is supplied to each part.)
そこで、内線電話機が発呼すると、端末制御装置にオフ
フック情報が伝えられ、端末制御装置の信号処理部から
の指令Ct(Cm)によ〕電源起動部の起動スイッチ(
トランジス/T)t−オンとし。Therefore, when the extension telephone makes a call, off-hook information is transmitted to the terminal control device, and the start switch of the power start section (
Transistor/T) t-on.
局に対し直流起動(ム→D、・→T −46〜b −D
□→B)をかける。その後端末制御atti局との間で
同期をと1、信号O送受が行なわれる。DC start for the station (mu→D,・→T -46~b -D
Multiply □→B). Thereafter, synchronization is established with the terminal control atti station, and signal O transmission and reception are performed.
着信呼の場合には、局からの転極によシミ源起動部のダ
イオードブリッジを介し、B−eD、1−+a〜1)
−1) D 、、→ムのループが形成され端末制御値ぽ
に対し、電源が供給される。In the case of an incoming call, B-eD, 1-+a~1) via the diode bridge of the stain source activation part due to the polarity change from the station.
-1) A loop of D, , →M is formed and power is supplied to the terminal control value P.
tた、局線と内線電話機と間の通話は、その内fIaw
1話機に対応する端末電源供給スイッチC3Wtオンと
す纂ことによp1通話中に電源DENが停電となっても
使用局線からの電源はダイオードDI(D、)を介し供
給され、局線通話は保持される。この端末電源供給スイ
ッチC8Wは内線通話時はオフ状態としである。In addition, calls between the central office line and extension telephone are fIaw.
By turning on the terminal power supply switch C3Wt corresponding to the 1-talk machine, even if the power supply DEN is out of power during a P1 call, power from the office line in use is supplied via the diode DI (D,), and the office line call is continued. is retained. This terminal power supply switch C8W is kept off during an extension call.
通話波の切断圧対しては、内線電話機からのオy7.り
情報を信号処理部が検知すると%端末制御装置は局へ切
断要求信号を出し、局からの切断完了信号により電源起
動11Pt(Pz)の起動スイッチ(トランジスタT)
t−オフとし、ループ開放を行なう。を九同時に端末電
源供給スイッチC8Wもオフとする。Regarding the cutting pressure of the call wave, the pressure from the extension telephone is 7. When the signal processing unit detects the information, the terminal control device issues a disconnection request signal to the station, and a disconnection completion signal from the station activates the power supply start switch (transistor T) of 11Pt (Pz).
Set to t-off and open the loop. At the same time, turn off the terminal power supply switch C8W.
一方、端末制御装置側の電源部DINが停電時に電源供
給することができなくなゐ、こO時局からの着信呼は、
局から転極によ〕起動され以後局給電によ〕動作可能で
あるが内線から局への発信時の起動方法が問題とe!・
この問題音解決す為ために、特定の内線電話機(Ihら
かしめ回線数等によ1複数の電話機上設置す為ことは可
能である。)のフックスイッチに連動してスイッチHa
によ〕、起動スイッチTが働かなくても局へ直流起
動が可能にしてあゐ。即ち先に説−した様に電源部DE
Nからの電源供給が断とな為と電源断検出回路DETが
スイッチSItオンとする(これは1例えば電源が供給
されていゐときスイッチ5st−オフに保持しておけば
よい、)。従ってム=D1o −H8−481−e a
〜b =DH→Bのループにより局線へ直接発呼可能
と擾る。On the other hand, the power supply DIN on the terminal control device side is unable to supply power during a power outage, and incoming calls from the station at this time are
The e! - In order to solve this problem, it is possible to set the switch Ha in conjunction with the hook switch of a specific extension telephone (it is possible to install it on one or more telephones depending on the number of lines, etc.).
], it is possible to start the station with direct current even if the start switch T does not work. That is, as explained earlier, the power supply section DE
Since the power supply from N is cut off, the power cutoff detection circuit DET turns on the switch SIt (for example, it is sufficient to keep the switch 5st off when the power is being supplied). Therefore, Mu = D1o -H8-481-e a
~b=DH→B loop makes it possible to call directly to the central office line.
を九、商用電源部等の出力電圧上(局線からの)電源起
動部からの出力電圧よル高く設定することによりダイオ
ード・オアの特性により局電源の消費電力を減少させゐ
ことができる。(9) By setting the output voltage of the commercial power supply unit, etc. higher than the output voltage of the power source startup unit (from the station line), the power consumption of the station power supply can be reduced due to the diode-OR characteristics.
以上説明したように本発明によれは、局電源を端末装置
側の独立の電源とのダイオード・オアによる共用化部を
持つことKより、局給電を受けない内線通話においても
端末制御装置における共通部を利用できハードウェアの
構成上回路が複雑とならず、軽済化が図られ且つ、信頼
性の高いものとすることができる。As explained above, according to the present invention, by having a section for sharing the station power supply with an independent power supply on the terminal device side using a diode-OR, it is possible to share the common power supply in the terminal control device even in extension calls that do not receive the station power supply. The circuit can be used without complicating the hardware configuration, making it more economical and highly reliable.
第1図は本発明に係る端末制御装置の構成図、第2図は
端末制御装置に接続される内線電話機の構成図、第3図
は第1図の端末制御装置の電源起動部の構成図である。
DSEt−DSEt ;電源分離部、DCNT+ 、D
CNTa;伝送制御部、COM;共通部、5CNT、、
嘗 ;内線制御部、DD、、、 ;電源重量部、pHP
雪;電源起動部、DEN;独立の電源部、DEN;電源
断検出部。
11頁の続き
0発 明 者 飯塚聰
横須賀市武1丁目2356番地日本
電信電話公社横須賀電気通信研
突所内
■出 願 人 日本電信電話公社FIG. 1 is a configuration diagram of a terminal control device according to the present invention, FIG. 2 is a configuration diagram of an extension telephone connected to the terminal control device, and FIG. 3 is a configuration diagram of a power supply starting section of the terminal control device in FIG. 1. It is. DSEt-DSEt; power supply separation section, DCNT+, D
CNTa: Transmission control section, COM: Common section, 5CNT,
嘗 ; Extension control section, DD, ; Power supply weight section, pHP
Snow: power supply startup section, DEN: independent power supply section, DEN: power failure detection section. Continued on page 11 0 Inventor Satoshi Iizuka 1-2356 Takeshi, Yokosuka City Yokosuka Telecommunications Research Center, Nippon Telegraph and Telephone Public Corporation Applicant Nippon Telegraph and Telephone Public Corporation
Claims (1)
11記局線から送られてくる情報から分離抽出した電源
と、帥1端末制御装置側で独立に供給する電源との共用
化部?もち、前記端末制御装置の各部へ電源供給を行な
うことを特徴とす4電源供給方式。In the terminal control device ft that accommodates the office line and extension line, f1
A unit that shares the power source separated and extracted from the information sent from the 11th station line and the power source that is independently supplied from the 1st terminal control device side? 4 power supply system characterized in that power is supplied to each part of the terminal control device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13914381A JPS5840968A (en) | 1981-09-03 | 1981-09-03 | Power supply applying system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13914381A JPS5840968A (en) | 1981-09-03 | 1981-09-03 | Power supply applying system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5840968A true JPS5840968A (en) | 1983-03-10 |
Family
ID=15238555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13914381A Pending JPS5840968A (en) | 1981-09-03 | 1981-09-03 | Power supply applying system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5840968A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60125052A (en) * | 1983-12-09 | 1985-07-04 | Nippon Telegr & Teleph Corp <Ntt> | Power supply system of customer station controller |
JPS60130235A (en) * | 1983-12-16 | 1985-07-11 | Fujitsu Ltd | Data and voice transmitter |
JPS60240265A (en) * | 1984-05-15 | 1985-11-29 | Nec Corp | Composite terminal equipment |
JPS61184342U (en) * | 1985-05-08 | 1986-11-17 |
-
1981
- 1981-09-03 JP JP13914381A patent/JPS5840968A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60125052A (en) * | 1983-12-09 | 1985-07-04 | Nippon Telegr & Teleph Corp <Ntt> | Power supply system of customer station controller |
JPS6337548B2 (en) * | 1983-12-09 | 1988-07-26 | Nippon Telegraph & Telephone | |
JPS60130235A (en) * | 1983-12-16 | 1985-07-11 | Fujitsu Ltd | Data and voice transmitter |
JPH0522419B2 (en) * | 1983-12-16 | 1993-03-29 | Fujitsu Ltd | |
JPS60240265A (en) * | 1984-05-15 | 1985-11-29 | Nec Corp | Composite terminal equipment |
JPS61184342U (en) * | 1985-05-08 | 1986-11-17 | ||
JPH0346603Y2 (en) * | 1985-05-08 | 1991-10-02 |
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