JPH04274645A - Data terminal equipment - Google Patents

Data terminal equipment

Info

Publication number
JPH04274645A
JPH04274645A JP3034911A JP3491191A JPH04274645A JP H04274645 A JPH04274645 A JP H04274645A JP 3034911 A JP3034911 A JP 3034911A JP 3491191 A JP3491191 A JP 3491191A JP H04274645 A JPH04274645 A JP H04274645A
Authority
JP
Japan
Prior art keywords
data terminal
power
dte
switching network
terminal equipment
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
JP3034911A
Other languages
Japanese (ja)
Inventor
Masao Uchino
内野 雅央
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.)
NEC Solution Innovators Ltd
Original Assignee
NEC Solution Innovators 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 NEC Solution Innovators Ltd filed Critical NEC Solution Innovators Ltd
Priority to JP3034911A priority Critical patent/JPH04274645A/en
Publication of JPH04274645A publication Critical patent/JPH04274645A/en
Pending legal-status Critical Current

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  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To reduce useless wait time by recognizing a fault of connection in a short period. CONSTITUTION:An incoming call reject signal generating circuit 106 is provided to a data terminal equipment 101, and when a power supply of the data terminal equipment 101 is interrupted, an incoming reject signal 111 is outputted to an exchange network 102 at all times. Thus, an exchange network 102 informs a fault of connection immediately without awaiting time-out with respect to a call from a data terminal equipment 107.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】本発明はデータ端末装置に関する
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data terminal equipment.

【0002】0002

【従来の技術】従来のデータ端末装置は、自身の電源の
投入状態を交換網へ示す信号を有していなかった。
2. Description of the Related Art Conventional data terminal equipment did not have a signal indicating its own power-on state to a switching network.

【0003】図2はデータ端末装置の使用形態を示すブ
ロック図である。
FIG. 2 is a block diagram showing how the data terminal device is used.

【0004】201、202はデータ端末装置(以下D
TEと呼ぶ)であり、203は交換網である。210、
211は例えばRS232−Cに代表されるデータ通信
インタフェースである。
201 and 202 are data terminal devices (hereinafter referred to as D
(referred to as TE), and 203 is a switching network. 210,
211 is a data communication interface represented by, for example, RS232-C.

【0005】以下にDTEとして従来のデータ端末装置
を使用した場合の動作を説明する。
[0005] The operation when a conventional data terminal device is used as a DTE will be explained below.

【0006】ここで、DTE201からDTE202へ
発呼接続する時に、DTE202の電源が切断されてい
る場合を考える。まず、DTE201から発呼し、交換
網203を介してDTE202に着呼するが、DTE2
02は電源が切断されているため、データ通信は不可能
な状態である。しかしながらDTE202はデータ通信
が不可能であるという状態を外部へ通知する手段を有し
ていないため、交換網203はDTE202が通信不可
能であることを直接認識出来ない。従って着呼に対する
DTE202からの対応を交換網201が時間監視をし
、タイムアウトした時点で交換網201は、DTE20
1へ発呼接続失敗を通知することになり、その時点でD
TE201は、DTE202とのデータ通信が不可であ
ることを初めて認識する。
[0006] Now, consider a case where the power of DTE 202 is cut off when a call is made from DTE 201 to DTE 202. First, a call is made from the DTE 201, and the call arrives at the DTE 202 via the switching network 203.
02 is in a state where data communication is impossible because the power is cut off. However, since the DTE 202 does not have a means to notify the outside that data communication is impossible, the switching network 203 cannot directly recognize that the DTE 202 is unable to communicate. Therefore, the switching network 201 time-monitors the response from the DTE 202 to the incoming call, and when the timeout occurs, the switching network 201
1 will be notified of the call connection failure, and at that point D
The TE 201 recognizes for the first time that data communication with the DTE 202 is impossible.

【0007】[0007]

【発明が解決しようとする課題】上述した従来のデータ
端末装置は、被呼側の電源切断を知るのに交換網が行う
時間監視がタイムアウトするまで待たなければならない
ので、その間、発呼側DTEは他のDTEに発呼するこ
とができず、処理効率が低下するという問題点がある。
[Problems to be Solved by the Invention] The conventional data terminal equipment described above has to wait until the time monitoring performed by the switching network times out in order to know that the called side's power has been cut off. cannot make a call to other DTEs, which poses a problem in that processing efficiency decreases.

【0008】[0008]

【課題を解決するための手段】本発明のデータ端末装置
は、交換網に接続されるデータ端末装置において、電源
部の出力する電源投入状態を示す電源状態表示信号を受
け前記電源状態表示信号が電源切断状態であることを検
出すると前記交換網に着呼拒否信号を出力する着呼拒否
信号発生回路を有する構成である。
[Means for Solving the Problems] A data terminal device of the present invention is a data terminal device connected to a switching network, in which a power state display signal indicating a power-on state outputted from a power supply section is received, and the power state display signal is This configuration includes an incoming call rejection signal generation circuit that outputs an incoming call rejection signal to the switching network when it detects that the power is in a power-off state.

【0009】[0009]

【実施例】次に本発明について図面を参照して説明する
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

【0010】図1は、本発明の一実施例のブロック図で
ある。
FIG. 1 is a block diagram of one embodiment of the present invention.

【0011】101は本発明のDTE、102は交換網
、103はデータ通信制御部であり従来のDTEに相当
する。104はDTE101の電源部であり、データ通
信制御部103に対し電源供給を行なうと共に、電源投
入状態を示す電源状態表示信号112を出力する。ここ
で電源表示信号112は電源投入を示していれば“1”
であり、また電源状態切断を示していれば“0”とする
。106は着呼拒否信号発生回路、107は他のDTE
である。着呼拒否信号発生回路106は、電源状態表示
信号112を入力し、電源状態表示信号112が“0”
ならば着呼拒否信号111を交換網102に対して出力
し、“1”ならば出力しないものとする。また、110
はデータ通信インタフェースであり、たとえばRS23
2−Cに代表されるものである。
101 is a DTE of the present invention, 102 is a switching network, and 103 is a data communication control unit, which corresponds to a conventional DTE. Reference numeral 104 denotes a power supply section of the DTE 101, which supplies power to the data communication control section 103 and outputs a power state display signal 112 indicating a power-on state. Here, the power display signal 112 is “1” if it indicates that the power is turned on.
, and if it indicates that the power supply state is disconnected, it is set to "0". 106 is an incoming call rejection signal generation circuit, and 107 is another DTE.
It is. The incoming call rejection signal generation circuit 106 inputs the power state display signal 112, and when the power state display signal 112 is "0"
If so, the incoming call rejection signal 111 is output to the switching network 102, and if it is "1", it is not output. Also, 110
is a data communication interface, for example RS23
This is typified by 2-C.

【0012】次に、本発明の特徴的な動作であるDTE
の電源が切断状態の場合の動作を説明する。
Next, DTE, which is a characteristic operation of the present invention,
The operation when the power is off is explained below.

【0013】DTE107から発呼を行った時、DTE
101が電源切断状態である場合、電源状態表示信号1
12が“0”であるので着呼拒否信号発生回路106は
、着呼拒否信号111を交換網に対して常に出力してい
る。そのため、交換網102はDTE101に対する発
呼をDTE107から受け付けた時点でDTE101が
着呼拒否状態であことを認識できる。従って、交換網1
02は、DTE107からDTE101への発呼受付時
に、DTE101より着呼着呼信号111を受けている
時は、データ通信が不可能であると判断し、DTE10
7へ接続失敗を通知する。
[0013] When a call is made from the DTE 107, the DTE
When 101 is in a power-off state, power state display signal 1
12 is "0", the incoming call rejection signal generation circuit 106 always outputs the incoming call rejection signal 111 to the switching network. Therefore, the switching network 102 can recognize that the DTE 101 is in the incoming call rejection state at the time it receives a call to the DTE 101 from the DTE 107. Therefore, switching network 1
When accepting a call from DTE 107 to DTE 101, 02 determines that data communication is impossible when receiving an incoming call signal 111 from DTE 101, and
7 of the connection failure.

【0014】ここで、着呼拒否信号回路106を例えば
、リレーを用いて構成することで、DTE101が電源
切断状態であっても、着呼拒否信号111を交換網10
2に対し、出力することは可能である。
By configuring the incoming call rejection signal circuit 106 using, for example, a relay, the incoming call rejection signal 111 can be sent to the switching network 10 even if the DTE 101 is powered off.
2, it is possible to output.

【0015】一方、DTE101が電源投入状態である
時は、着呼拒否信号111を出力しないので、その場合
は、従来のDTEと同様にデータ通信制御部103がイ
ンタフェース110を介してデータ通信を行う。
On the other hand, when the DTE 101 is powered on, it does not output the incoming call rejection signal 111, so in that case, the data communication control unit 103 performs data communication via the interface 110 as in the conventional DTE. .

【0016】[0016]

【発明の効果】以上説明したように本発明は、着呼拒否
信号拒否回路を設け、データ端末装置の電源が切断され
ていな場合には、常に着呼拒否信号を交換網へ出力する
。そのため、交換網側では接続されているデータ端末装
置の状態を常に監視できるので時間監視による状態監視
が不要となる。従って、交換網は、タイムアウトを待つ
ことなく直ちに発呼側データ端末装置へ接続失敗を通知
することが出来るので、発呼側データ端末装置は別のデ
ータ端末装置に発呼するまでの無駄な待ち時間を少なく
することが出来るという効果ある。
As described above, the present invention includes an incoming call rejection signal rejection circuit, and always outputs an incoming call rejection signal to the switching network when the data terminal device is not powered off. Therefore, since the switching network side can always monitor the status of the connected data terminal equipment, there is no need to monitor the status by time monitoring. Therefore, the switching network can immediately notify the calling data terminal of a connection failure without waiting for a timeout, so the calling data terminal does not have to wait in vain before calling another data terminal. This has the effect of reducing time.

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

【図1】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.

【図2】データ端末装置の使用形態を示すブロック図で
ある。
FIG. 2 is a block diagram showing how the data terminal device is used.

【符号の説明】[Explanation of symbols]

101,107    データ端末装置(DTE)10
2    交換網 103    データ通信制御部 104    電源部 106    着呼拒否信号発生回路 110    データ通信インタフェース111   
 着呼拒否信号 112    電源状態表示信号
101,107 Data terminal equipment (DTE) 10
2 Switching network 103 Data communication control unit 104 Power supply unit 106 Call rejection signal generation circuit 110 Data communication interface 111
Incoming call rejection signal 112 Power status display signal

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  交換網に接続されるデータ端末装置に
おいて、電源部の出力する電源投入状態を示す電源状態
表示信号を受け前記電源状態表示信号が電源切断状態で
あることを検出すると前記交換網に着呼拒否信号を出力
する着呼拒否信号発生回路を有することを特徴とするデ
ータ端末装置。
1. In a data terminal device connected to a switching network, when receiving a power state display signal indicating a power-on state outputted from a power supply unit and detecting that the power state display signal indicates a power-off state, the data terminal device connects to the switching network. A data terminal device comprising an incoming call rejection signal generation circuit that outputs an incoming call rejection signal to the terminal.
JP3034911A 1991-03-01 1991-03-01 Data terminal equipment Pending JPH04274645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3034911A JPH04274645A (en) 1991-03-01 1991-03-01 Data terminal equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3034911A JPH04274645A (en) 1991-03-01 1991-03-01 Data terminal equipment

Publications (1)

Publication Number Publication Date
JPH04274645A true JPH04274645A (en) 1992-09-30

Family

ID=12427393

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3034911A Pending JPH04274645A (en) 1991-03-01 1991-03-01 Data terminal equipment

Country Status (1)

Country Link
JP (1) JPH04274645A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58132833A (en) * 1982-02-01 1983-08-08 Toyo Commun Equip Co Ltd Information transmitting method
JPS58136154A (en) * 1982-02-05 1983-08-13 Toyo Commun Equip Co Ltd Power failure information transmitting method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58132833A (en) * 1982-02-01 1983-08-08 Toyo Commun Equip Co Ltd Information transmitting method
JPS58136154A (en) * 1982-02-05 1983-08-13 Toyo Commun Equip Co Ltd Power failure information transmitting method

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Effective date: 19971104