JPH02183641A - Frame synchronizing system - Google Patents
Frame synchronizing systemInfo
- Publication number
- JPH02183641A JPH02183641A JP1003177A JP317789A JPH02183641A JP H02183641 A JPH02183641 A JP H02183641A JP 1003177 A JP1003177 A JP 1003177A JP 317789 A JP317789 A JP 317789A JP H02183641 A JPH02183641 A JP H02183641A
- Authority
- JP
- Japan
- Prior art keywords
- synchronization
- frame
- station
- detection pattern
- detecting pattern
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000003780 insertion Methods 0.000 abstract description 21
- 230000037431 insertion Effects 0.000 abstract description 21
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
- H04J3/0605—Special codes used as synchronising signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/10—Arrangements for initial synchronisation
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はディジタル通信に関し、特に情報伝送効率の
よいフレーム同期方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to digital communications, and particularly to a frame synchronization method with high information transmission efficiency.
従来、この種のフレーム同期方式では第３図に示すよう
に、１フレーム中のある部分（通常は先頭の部分）に同
期位置検出用のパタン（同期パルス）が固定的に挿入さ
れたフレーム構成を用いている。一方、受信側のフレー
ム同期回路は受信符号列の中からこの同期パルスを検出
し、フレームの先頭位置を認識する。そして、フレーム
同期が確立された後も全同期パルスを常時監視して同期
がとれていることを確認してお９、もしフレーム同期が
はずれたならば直ちにフレーム同期復帰の動作を行う。Conventionally, this type of frame synchronization method has a frame structure in which a pattern (synchronization pulse) for detecting the synchronization position is fixedly inserted in a certain part of one frame (usually the beginning part), as shown in Figure 3. is used. On the other hand, the frame synchronization circuit on the receiving side detects this synchronization pulse from the received code string and recognizes the beginning position of the frame. Even after frame synchronization is established, all synchronization pulses are constantly monitored to confirm that synchronization is achieved.9 If frame synchronization is lost, an operation to restore frame synchronization is immediately performed.
このフレーム同期復帰時間を短かくｆ、６には１フレー
ム内の同期パルスの数を多くすればよいが、このように
すると情報伝送の効率が低下する。このため、同期パル
スの数はフレーム同期復帰時間と情報伝送効率の均衡を
考えて決定される。Although this frame synchronization recovery time can be shortened by increasing the number of synchronization pulses in one frame for f,6, doing so will reduce the efficiency of information transmission. Therefore, the number of synchronization pulses is determined by considering the balance between frame synchronization recovery time and information transmission efficiency.
なお、第３図に示すフレーム構成において、Ｆは同期位
置検出用パターン挿入位置、Ｇは監視制御情報挿入位置
、Ｉは一般情報ビット位置である。In the frame structure shown in FIG. 3, F is a synchronization position detection pattern insertion position, G is a supervisory control information insertion position, and I is a general information bit position.
上述した従来のフレーム同期方式は、１フレーム中のあ
る部分に同期パルスが固定的に挿入されておシ、フレー
ム同期復帰時間を短くするために１フレーム中の同期パ
ルスの数を多くすると、情報伝送の効率が低下するとい
う欠点がある。In the conventional frame synchronization method described above, a synchronization pulse is fixedly inserted in a certain part of one frame, and when the number of synchronization pulses in one frame is increased to shorten the frame synchronization recovery time, information The disadvantage is that the transmission efficiency is reduced.
この発明に係るフレーム同期方式は、自局のフレーム同
期の同期状態あるいは同期はずれ状態を対向局に通知す
る手段と、両端局でフレーム同期が確立されたときフレ
ーム中の同期位置検出用パタンの一部を他の目的をもつ
オーバーヘッドに割探当てる手段とを有している。The frame synchronization method according to the present invention includes means for notifying the opposite station of the synchronization state or out-of-synchronization state of the frame synchronization of its own station, and a means for notifying the opposite station of the synchronization state or out-of-synchronization state of the frame synchronization of its own station, and a means for detecting the synchronization position in the frame when frame synchronization is established at both end stations. and means for allocating the portion to overhead for other purposes.
この発明は情報の伝送効率を高めることができる。 This invention can improve information transmission efficiency.
第１図はこの発明に係るフレーム同期方式の一実施例を
示すブロック図であり、第２図は第１図のフレーム同期
方式に用いるフレーム構成を示す図である。−例として
２局間の伝送システムにおいて、Ｃ局受信部でフレーム
同期をとる場合を示す。同図において、１は送信部２お
よび受信部３からなるＡ局、４および５は伝送路、６は
送信部γおよび受信部８からなる０局、Ｆ、は第１同期
位置検出用パタン挿入位置、Ｆ２は第２同期位置検出用
パタン挿入位置、Ｓは同期状態通知用ビット位置、■は
一般情報ビット位置である。FIG. 1 is a block diagram showing an embodiment of the frame synchronization method according to the present invention, and FIG. 2 is a diagram showing a frame structure used in the frame synchronization method of FIG. 1. - As an example, in a transmission system between two stations, a case is shown in which frame synchronization is achieved in the C station receiving section. In the figure, 1 is a station A consisting of a transmitting section 2 and a receiving section 3, 4 and 5 are transmission lines, 6 is a station 0 consisting of a transmitting section γ and a receiving section 8, and F is a first synchronization position detection pattern insertion F2 is the second synchronization position detection pattern insertion position, S is the synchronization state notification bit position, and ■ is the general information bit position.
なお、上記０局６の受信部８でフレーム同期がとれてい
ないとき、送信部７は送信フレーム中の同期状態通知用
ビットＳを「０」として送信し、フレーム同期がとれた
ときにはこの同期状態通知用ビットＳを「１」に変更し
て送信する手段を備えている。上記Ａ局１の送信部２は
受信したフレーム中の同期状態通知用ビットＳが「０」
のとき、送信するフレーム中の第１同期位置検出用パタ
ン挿入位置Ｆｌおよび第２同期位置検出用パタン挿入位
置Ｆ２に所定の同期位置検出用パタンを挿入し、受信し
たフレーム中の同期状態通知用ビットＳが「１」のとき
、送信するフレーム中の第１同期位置検出用パタン挿入
位置Ｆ１に同期位置検出用パタンを挿入し、第２同期位
置検出用パタン挿入位ｕＦ２に他の目的をもつオーバー
ヘッド例えば監視情報あるいは制御用情報を挿入する手
段を供えている。Note that when frame synchronization is not achieved in the receiving section 8 of the 0 station 6, the transmitting section 7 transmits the synchronization state notification bit S in the transmission frame as "0", and when frame synchronization is achieved, this synchronization state is It is provided with means for changing the notification bit S to "1" and transmitting it. The transmission unit 2 of the A station 1 has the synchronization status notification bit S in the received frame as “0”.
At this time, a predetermined synchronization position detection pattern is inserted into the first synchronization position detection pattern insertion position Fl and the second synchronization position detection pattern insertion position F2 in the frame to be transmitted, and the synchronization state notification pattern is inserted into the received frame. When bit S is "1", a synchronization position detection pattern is inserted at the first synchronization position detection pattern insertion position F1 in the frame to be transmitted, and the second synchronization position detection pattern insertion position uF2 is used for other purposes. Means for inserting overhead such as monitoring information or control information is provided.
次に上記構成によるフレーム同期方式の動作について説
明する。まず、６局６の受信部８でフレーム同期がとれ
ていないとき、送信部７は送信フレーム中の同期状態通
知ビットＳを「０」としてＡ局１に送信する。一方、Ａ
局１はこの受信したフレーム中の同期状態通知ビットＳ
が「０」のため、送信フレーム中の第１同期位置検出用
パタン挿入位置Ｆ１および第２同期位置検出用パタン挿
入位置Ｆ２に所定の同期位置検出用パタゾを挿入して送
信する。したがって、６局６ではこの受信したフレーム
中の第１同期位置検出用パタン挿入位置Ｆ、および第２
同期位置検出用パタン挿入位置Ｆ２に挿入された同期位
置検出用パタンを検出照合し、フレーム同期復帰動作を
行う。そして、次に、６局６の受信部８でフレーム同期
がとれたとき、６局６の送信部７は送信フレーム中の同
期状態通知ビットを「１」としてＡ局１に送信する。Next, the operation of the frame synchronization method with the above configuration will be explained. First, when frame synchronization is not achieved in the receiving section 8 of the six stations 6, the transmitting section 7 sets the synchronization state notification bit S in the transmission frame to "0" and transmits it to the A station 1. On the other hand, A
Station 1 uses the synchronization status notification bit S in this received frame.
is "0", so predetermined synchronization position detection patterns are inserted into the first synchronization position detection pattern insertion position F1 and the second synchronization position detection pattern insertion position F2 in the transmission frame and transmitted. Therefore, in the sixth station 6, the first synchronization position detection pattern insertion position F and the second
The synchronization position detection pattern inserted into the synchronization position detection pattern insertion position F2 is detected and verified, and a frame synchronization recovery operation is performed. Then, when frame synchronization is achieved in the receiving section 8 of the six stations 6, the transmitting section 7 of the six stations 6 sets the synchronization state notification bit in the transmission frame to "1" and transmits it to the A station 1.
Ａ局１はこの受信したフレーム中の同期状態通知ビット
が１１」のため、送信フレーム中の第１同期位置検出用
パタン挿入位置Ｆ１に所定の同期位置検出用パタンを挿
入し、第２同期位置検出用パタン挿入位置Ｆ２に他の目
的をもつオーバーヘッド例えば監視情報や制御用情報な
どを挿入して６局６に送信する。したがって、６局６は
この第１同期位置検出用パタン挿入位置Ｆ、の同期位置
検出用パタンを監視することによって同期状態の確認を
続けることができ、かつ、第２同期位置検出用パタ／挿
入位置Ｆ２に挿入された監視情報、制御用情報を受ける
ことができる。Since the synchronization state notification bit in the received frame is 11, station A 1 inserts a predetermined synchronization position detection pattern into the first synchronization position detection pattern insertion position F1 in the transmission frame, and inserts a predetermined synchronization position detection pattern into the second synchronization position. Overhead having other purposes, such as monitoring information and control information, is inserted into the detection pattern insertion position F2 and transmitted to the six stations 6. Therefore, the 6th station 6 can continue checking the synchronization state by monitoring the synchronization position detection pattern at the first synchronization position detection pattern insertion position F, and the second synchronization position detection pattern/insertion Monitoring information and control information inserted at position F2 can be received.
なお、上述の説明では６局６の受信部で同期をとる場合
について説明したが、Ａ局１の受信部で同期をとる場合
についても同様にできることはもちろんである。In the above description, the case where the receiving sections of the six stations 6 are synchronized is described, but it goes without saying that the same can be done when the receiving section of the A station 1 is synchronized.
以上詳細に説明したように、この発明に係るフレーム同
期方式によれば、同期復帰過程で多数の同期パルス（長
い同期検出用パタン）を用いることによって速やかに同
期復帰を行なわせる一方、同期がとれた状態においては
同期検出用パタンの一部を他の目的（監視制御など）の
オーバーヘツドに割り当てることによシ情報の伝送効率
を高めることができる効果がある。As explained in detail above, according to the frame synchronization method according to the present invention, synchronization can be quickly restored by using a large number of synchronization pulses (long synchronization detection patterns) in the synchronization restoration process, and synchronization cannot be achieved. In such a situation, it is possible to increase the efficiency of information transmission by allocating a part of the synchronization detection pattern to overhead for other purposes (such as supervisory control).
第１図はこの発明に係るフレーム同期方式の一実施例を
示すブロック図、第２図は第１図のフレーム同期方式に
用いるフレーム構成を示す図、第３図は従来のフレーム
同期方式に用いるフレーム構成を示す図である。
１・・・、Ａ局、２９＠＠＠送信部、３・、。
・受信部、４および５・・・・伝送路、６・・の６局、
７・・・・送信部、８・・・・受信部、Ｆｌ・・・・第
１同期位置検出用パタン挿入位置、Ｆ ２・・・番第２
同期位置検出用パタン挿入位置、Ｓ・・・・同期状態通
知用ビット位置、工・・・・一般情報ビット位置。FIG. 1 is a block diagram showing an embodiment of the frame synchronization method according to the present invention, FIG. 2 is a diagram showing a frame structure used in the frame synchronization method shown in FIG. 1, and FIG. 3 is a diagram showing a frame structure used in the conventional frame synchronization method. FIG. 3 is a diagram showing a frame configuration. 1..., station A, 29@@@transmission section, 3.・Receiving section, 4 and 5...6 stations of transmission line, 6...
7... Transmission section, 8... Receiving section, Fl... First synchronization position detection pattern insertion position, F2... No. 2
Synchronization position detection pattern insertion position, S... bit position for synchronization status notification, engineering... general information bit position.
Claims (1)
の同期状態あるいは同期はずれ状態を対向局に通知する
手段と、両端局でフレーム同期が確立されたとき、フレ
ーム中の同期位置検出用パタンの一部を他の目的をもつ
オーバーヘッドに割り当てる手段とを備えたことを特徴
とするフレーム同期方式。In a digital transmission system, there is a means for notifying the opposite station of the synchronization state or out-of-synchronization state of the frame synchronization of one's own station, and a means for notifying the opposite station of the synchronization state or out-of-synchronization state of the frame synchronization of one's own station, and when frame synchronization is established at both end stations, a part of the synchronization position detection pattern in the frame is transmitted to another station. 1. A frame synchronization method comprising: means for allocating overhead having the purpose of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003177A JPH02183641A (en) | 1989-01-10 | 1989-01-10 | Frame synchronizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003177A JPH02183641A (en) | 1989-01-10 | 1989-01-10 | Frame synchronizing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02183641A true JPH02183641A (en) | 1990-07-18 |
Family
ID=11550108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1003177A Pending JPH02183641A (en) | 1989-01-10 | 1989-01-10 | Frame synchronizing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02183641A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04111550A (en) * | 1990-08-30 | 1992-04-13 | Nec Corp | Frame data multiplexing/demultiplexing system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730436A (en) * | 1980-07-30 | 1982-02-18 | Nippon Telegr & Teleph Corp <Ntt> | Frame synchronism system |
| JPS61210735A (en) * | 1985-03-14 | 1986-09-18 | Nec Corp | Auxiliary signal transmitting method |
-
1989
- 1989-01-10 JP JP1003177A patent/JPH02183641A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730436A (en) * | 1980-07-30 | 1982-02-18 | Nippon Telegr & Teleph Corp <Ntt> | Frame synchronism system |
| JPS61210735A (en) * | 1985-03-14 | 1986-09-18 | Nec Corp | Auxiliary signal transmitting method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04111550A (en) * | 1990-08-30 | 1992-04-13 | Nec Corp | Frame data multiplexing/demultiplexing system |
| JP2699628B2 (en) * | 1990-08-30 | 1998-01-19 | 日本電気株式会社 | Frame data demultiplexing method |
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