JPH04354437A - Digital data transmission interface - Google Patents

Digital data transmission interface

Info

Publication number
JPH04354437A
JPH04354437A JP3129982A JP12998291A JPH04354437A JP H04354437 A JPH04354437 A JP H04354437A JP 3129982 A JP3129982 A JP 3129982A JP 12998291 A JP12998291 A JP 12998291A JP H04354437 A JPH04354437 A JP H04354437A
Authority
JP
Japan
Prior art keywords
signal
data
parallel
converts
serial
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.)
Granted
Application number
JP3129982A
Other languages
Japanese (ja)
Other versions
JP3112032B2 (en
Inventor
Kenichi Nemoto
健一 根本
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 Corp
Original Assignee
NEC Corp
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 Corp filed Critical NEC Corp
Priority to JP03129982A priority Critical patent/JP3112032B2/en
Publication of JPH04354437A publication Critical patent/JPH04354437A/en
Application granted granted Critical
Publication of JP3112032B2 publication Critical patent/JP3112032B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Time-Division Multiplex Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To prevent omission of a data when byte synchronization is taken again. CONSTITUTION:An encoder 11 receiving a low speed signal converts it into a parallel signal, and a parallel/serial conversion circuit 12 converts the parallel signal into a serial signal. A multiplexer circuit 13 converts the serial signal into a high speed signal. When the state of the multiplexer circuit 13 is changed from the state of receiving a signal representing the transmission of a data into the state of receiving a signal representing untransmission of a data, the multiplexer circuit 13 takes byte synchronization again with a delay of a time for one byte from this point of time.

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、低速信号を高速信号に
多重化して伝送するデジタルデ−タ伝送インタフェイス
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital data transmission interface for multiplexing low-speed signals into high-speed signals and transmitting the multiplexed signals.

【0002】0002

【従来の技術】従来より、デジタルデ−タ伝送インタフ
ェイスとして、デ−タ端末装置から加入者線を介して伝
送されてきた信号をDS0信号に変換するオフィスチャ
ンネルユニット(OCU)が知られている。このOCU
は、宅内終端装置がデ−タ端末装置からデ−タがないこ
とを示す情報を受けてアイドルコ−ドを送出した場合に
、これを受信してこのアイドルコ−ドに含まれるコント
ロ−ルコ−ドをそのままDS0信号として送信すること
ができるようにするためバイト同期を取り直している。
2. Description of the Related Art Conventionally, an office channel unit (OCU) has been known as a digital data transmission interface, which converts a signal transmitted from a data terminal device via a subscriber line into a DS0 signal. There is. This OCU
When the home terminal equipment receives information from the data terminal equipment indicating that there is no data and sends out an idle code, it receives this and sends the control code included in this idle code. Byte synchronization is being re-established so that the - code can be sent as is as a DS0 signal.

【0003】0003

【発明が解決しようとする課題】しかし、従来のOCU
においては、アイドルコ−ドを受けた場合においてバイ
ト同期を取り直す際に、アイドルコ−ドの直前に位置す
るビットにアイドルコ−ドがかぶさってしまうから、ア
イドルコ−ドの直前に位置するビット(図3においては
4ビット)が欠落してしまういう問題がある。
[Problem to be solved by the invention] However, the conventional OCU
In this case, when re-synchronizing bytes when an idle code is received, the idle code overlaps the bit located immediately before the idle code, so the bit located immediately before the idle code is There is a problem that (4 bits in FIG. 3) are lost.

【0004】本発明の課題は、デ−タが送信されている
ことを示す信号を受けている状態からデ−タが送信され
ていないことを示す信号を受ける状態に変わった時に(
アイドルコ−ドを受けた時)バイト同期を取り直す際に
デ−タの欠落を防止することができるデジタルデ−タ伝
送インタフェイスを提供することにある。
[0004] The problem of the present invention is that when the state changes from receiving a signal indicating that data is being transmitted to receiving a signal indicating that data is not being transmitted (
An object of the present invention is to provide a digital data transmission interface that can prevent data loss when re-synchronizing bytes (when an idle code is received).

【0005】[0005]

【課題を解決するための手段】本発明によれば、低速信
号を高速信号に多重化して伝送するデジタルデ−タ伝送
インタフェイスにおいて、デ−タが送信されていること
を示す信号を受けている状態からデ−タが送信されてい
ないことを示す信号を受ける状態に変わった時にこの時
点から1バイト分の時間を遅らせてからバイト同期を取
り直すことを特徴とするデジタルデ−タ伝送インタフェ
イスが得られる。
[Means for Solving the Problems] According to the present invention, in a digital data transmission interface that multiplexes a low-speed signal into a high-speed signal and transmits the same, a signal indicating that data is being transmitted is received. A digital data transmission interface characterized in that when the state changes from a state in which data is being transmitted to a state in which a signal indicating that data is not being transmitted is received, a time delay of one byte is delayed from this point and then byte synchronization is reestablished. is obtained.

【0006】また、本発明によれば、低速信号を高速信
号に多重化して伝送するデジタルデ−タ伝送インタフェ
イスにおいて、前記低速信号を受けてパラレル信号に変
換するエンコ−ダと、このエンコ−ダからのパラレル信
号をシリアル信号に変換するパラレル/シリアル変換回
路と、このパラレル/シリアル変換回路からのシリアル
信号を高速信号に変換する多重化回路とを具備し、前記
多重化回路は、デ−タが送信されていることを示す信号
を受けている状態からデ−タが送信されていないことを
示す信号を受ける状態に変わった時にこの時点から1バ
イト分の時間を遅らせてからバイト同期を取り直すこと
を特徴とするデジタルデ−タ伝送インタフェイスが得ら
れる。
According to the present invention, a digital data transmission interface that multiplexes a low-speed signal into a high-speed signal and transmits the same includes an encoder that receives the low-speed signal and converts it into a parallel signal, and an encoder that receives the low-speed signal and converts it into a parallel signal. a parallel/serial conversion circuit that converts a parallel signal from a data processor into a serial signal, and a multiplexing circuit that converts a serial signal from the parallel/serial conversion circuit into a high-speed signal, and the multiplexing circuit is configured to convert a parallel signal from a data processor into a serial signal. When the state changes from receiving a signal indicating that data is being transmitted to receiving a signal indicating that data is not being transmitted, from this point on, the byte synchronization is delayed by one byte. A digital data transmission interface is obtained which is characterized in that it can be reused.

【0007】[0007]

【実施例】次に、本発明の実施例を図面に基いて詳細に
説明する。
Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

【0008】図1は、56kbpsのデジタルデ−タ信
号をDS0信号に変換する1実施例のフレ−ム構成図で
ある。
FIG. 1 is a frame configuration diagram of an embodiment for converting a 56 kbps digital data signal into a DS0 signal.

【0009】デ−タ端末装置の出力SDにおいてデ−タ
伝送が終了するとRS(Request  to  S
end)は、デ−タが送信されていないことを伝えるア
イドルコ−ドを送信する。ところで、56kbpsのデ
ジタルデ−タを受信したOCUでは、DS0信号として
送信するために、1バイトを7ビットのデジタルデ−タ
信号と1バイトのコントロ−ル信号に割り当てている。
[0009] When data transmission is completed at the output SD of the data terminal device, an RS (Request to S
end) sends an idle code indicating that no data is being sent. By the way, the OCU that receives 56 kbps digital data allocates 1 byte to a 7-bit digital data signal and a 1-byte control signal in order to transmit it as a DS0 signal.

【0010】このOCUにおいて、アイドルコ−ドに含
まれるコントロ−ルコ−ドをそのままDS0信号として
送信するために、7ビット単位のバイト同期を取り直す
。この際、RS信号がOFFになってから1バイト分の
時間遅らせてからバイト同期を取り直すことによってデ
ジタルデ−タを確実に伝送した後に、バイト同期を取り
直している。
[0010] In this OCU, in order to transmit the control code included in the idle code as it is as a DS0 signal, byte synchronization is re-established in units of 7 bits. At this time, byte synchronization is reestablished after a time delay of one byte after the RS signal is turned off, thereby ensuring that the digital data is transmitted, and then byte synchronization is reestablished.

【0011】なお、本発明は、9.6kbps、4.8
kbpsまたは2.4kbpsのサブレ−トについても
、適用することができる。
[0011] Note that the present invention provides 9.6 kbps, 4.8 kbps
It can also be applied to subrates of kbps or 2.4 kbps.

【0012】図2は、本発明をデジタルデ−タサ−ビス
(DDS)に適用した実施例を示すブロック図である。
FIG. 2 is a block diagram showing an embodiment in which the present invention is applied to a digital data service (DDS).

【0013】この実施例は、DDS送信デ−タ信号21
を受けてパラレルデ−タに変更するエンコ−ダ11と、
このエンコ−ダ11からのパラレルデ−タをDS0のシ
リアル信号に変換するパラレル/シリアル変換回路12
と、このパラレル/シリアル変換回路12からのDS0
のシリアル信号をDS1送信デ−タ信号22に変換する
DS0/DS1変換回路13と、DS1受信デ−タ信号
24をDS0信号へ変換するDS1/DS0変換回路1
4と、このDS1/SO0変換回路14からのDS0信
号を8ビットのパラレル信号に変換するシリアル/パラ
レル変換回路15と、このシリアル/パラレル変換回路
15のパラレル信号をこれからコントロ−ルビットを取
り除いたデ−タ信号へ変換するデコ−ダ16と、このデ
コ−ダ16のデ−タ信号にコントロ−ルコ−ドを加えて
シリアルのDDS受信デ−タ信号23へ変換するコント
ロ−ルコ−ド発生回路17とから構成されている。
In this embodiment, the DDS transmission data signal 21
an encoder 11 that receives the data and changes it to parallel data;
A parallel/serial conversion circuit 12 converts the parallel data from the encoder 11 into a serial signal of DS0.
and DS0 from this parallel/serial conversion circuit 12
DS0/DS1 conversion circuit 13 that converts the serial signal of DS1 into a DS1 transmission data signal 22, and DS1/DS0 conversion circuit 1 that converts the DS1 reception data signal 24 into a DS0 signal.
4, a serial/parallel conversion circuit 15 that converts the DS0 signal from this DS1/SO0 conversion circuit 14 into an 8-bit parallel signal, and a digital signal from which the control bits are removed from the parallel signal of this serial/parallel conversion circuit 15. - a decoder 16 that converts the data signal into a data signal, and a control code generation circuit that adds a control code to the data signal of the decoder 16 and converts it into a serial DDS reception data signal 23. It consists of 17.

【0014】前記パラレル/シリアル変換回路12と、
DS0/DS1変換回路13と、DS1/DS0変換回
路14と、シリアル/パラレル変換回路15とには、D
DSクロック信号が与えられる。
[0014] The parallel/serial conversion circuit 12;
The DS0/DS1 conversion circuit 13, the DS1/DS0 conversion circuit 14, and the serial/parallel conversion circuit 15 have D
A DS clock signal is provided.

【0015】前記DS0/DS1変換回路13において
は、RS信号がOFFになってから1バイト分の時間遅
らせてからバイト同期を取り直している。
In the DS0/DS1 conversion circuit 13, byte synchronization is reestablished after a delay of one byte after the RS signal is turned off.

【0016】[0016]

【発明の効果】本発明のデジタルデ−タ伝送インタフェ
イスは、デ−タが送信されていることを示す信号を受け
ている状態からデ−タが送信されていないことを示す信
号を受ける状態に変わった時にバイト同期を取り直す際
にデ−タの欠落を防止することができる。
Effects of the Invention The digital data transmission interface of the present invention changes from a state in which a signal indicating that data is being transmitted to a state in which it receives a signal indicating that data is not being transmitted. It is possible to prevent data loss when re-establishing byte synchronization when a change occurs.

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

【図1】本発明の1実施例におけるフレ−ムの構成を示
すフレ−ム構成図である。
FIG. 1 is a frame configuration diagram showing the configuration of a frame in one embodiment of the present invention.

【図2】本発明の1実施例を示すブロック図である。FIG. 2 is a block diagram showing one embodiment of the present invention.

【図3】従来のデジタルデ−タ伝送インタフェイスの1
例におけるフレ−ムの構成を示すフレ−ム構成図である
[Figure 3] One of conventional digital data transmission interfaces
FIG. 3 is a frame configuration diagram showing the configuration of a frame in an example.

【符号の説明】[Explanation of symbols]

11  エンコ−ダ 12  パラレル/シリアル変換回路 13  DS0/DS1変換回路 11 Encoder 12 Parallel/serial conversion circuit 13 DS0/DS1 conversion circuit

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】  低速信号を高速信号に多重化して伝送
するデジタルデ−タ伝送インタフェイスにおいて、デ−
タが送信されていることを示す信号を受けている状態か
らデ−タが送信されていないことを示す信号を受ける状
態に変わった時にこの時点から1バイト分の時間を遅ら
せてからバイト同期を取り直すことを特徴とするデジタ
ルデ−タ伝送インタフェイス。
Claim 1: A digital data transmission interface that multiplexes low-speed signals into high-speed signals and transmits the data.
When the state changes from receiving a signal indicating that data is being transmitted to receiving a signal indicating that data is not being transmitted, from this point on, the byte synchronization is delayed by one byte. A digital data transmission interface that is characterized by being able to be read again.
【請求項2】  低速信号を高速信号に多重化して伝送
するデジタルデ−タ伝送インタフェイスにおいて、前記
低速信号を受けてパラレル信号に変換するエンコ−ダと
、このエンコ−ダからのパラレル信号をシリアル信号に
変換するパラレル/シリアル変換回路と、このパラレル
/シリアル変換回路からのシリアル信号を高速信号に変
換する多重化回路とを具備し、前記多重化回路は、デ−
タが送信されていることを示す信号を受けている状態か
らデ−タが送信されていないことを示す信号を受ける状
態に変わった時にこの時点から1バイト分の時間を遅ら
せてからバイト同期を取り直すことを特徴とするデジタ
ルデ−タ伝送インタフェイス。
2. A digital data transmission interface that multiplexes a low-speed signal into a high-speed signal and transmits the same, comprising an encoder that receives the low-speed signal and converts it into a parallel signal, and an encoder that converts the low-speed signal into a parallel signal. It is equipped with a parallel/serial conversion circuit that converts the serial signal into a serial signal, and a multiplexing circuit that converts the serial signal from the parallel/serial conversion circuit into a high-speed signal.
When the state changes from receiving a signal indicating that data is being transmitted to receiving a signal indicating that data is not being transmitted, from this point on, the byte synchronization is delayed by one byte. A digital data transmission interface that is characterized by being able to be read again.
JP03129982A 1991-05-31 1991-05-31 Digital data transmission interface Expired - Fee Related JP3112032B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03129982A JP3112032B2 (en) 1991-05-31 1991-05-31 Digital data transmission interface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03129982A JP3112032B2 (en) 1991-05-31 1991-05-31 Digital data transmission interface

Publications (2)

Publication Number Publication Date
JPH04354437A true JPH04354437A (en) 1992-12-08
JP3112032B2 JP3112032B2 (en) 2000-11-27

Family

ID=15023237

Family Applications (1)

Application Number Title Priority Date Filing Date
JP03129982A Expired - Fee Related JP3112032B2 (en) 1991-05-31 1991-05-31 Digital data transmission interface

Country Status (1)

Country Link
JP (1) JP3112032B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200482043Y1 (en) * 2015-05-22 2016-12-09 주식회사 다다씨앤씨 A peak for headwear

Also Published As

Publication number Publication date
JP3112032B2 (en) 2000-11-27

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