JPS6130457B2 - - Google Patents
Info
- Publication number
- JPS6130457B2 JPS6130457B2 JP2157278A JP2157278A JPS6130457B2 JP S6130457 B2 JPS6130457 B2 JP S6130457B2 JP 2157278 A JP2157278 A JP 2157278A JP 2157278 A JP2157278 A JP 2157278A JP S6130457 B2 JPS6130457 B2 JP S6130457B2
- Authority
- JP
- Japan
- Prior art keywords
- slot
- station
- transmission line
- information
- transmitting
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/24—Time-division multiplex systems in which the allocation is indicated by an address the different channels being transmitted sequentially
- H04J3/245—Time-division multiplex systems in which the allocation is indicated by an address the different channels being transmitted sequentially in which the allocation protocols between more than two stations share the same transmission medium
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Time-Division Multiplex Systems (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は情報伝送系におけるタイムスロツト割
当て方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a time slot allocation method in an information transmission system.
親局制御局および子局を含むループ伝送方式で
は、フレームがループを一巡する間の同期ずれを
親局（制御局）で補正するために、遅延時間が大
きくなるという欠点があつた。これを解決する方
法として、ヘアピン形ループ伝送方式がある。
A loop transmission system including a master station control station and a slave station has the disadvantage that the delay time becomes large because the master station (control station) corrects synchronization errors while the frame goes around the loop. As a method to solve this problem, there is a hairpin loop transmission method.
これを第２図によつて説明すると、親局３に単
方向伝送回線４の送信端および受信端が接続さ
れ、この伝送回線に子局１，２が接続される。各
子局の送信端子１１，２１は伝送回線の送信端に
近い側Ｔに接続され、各子局の受信端子１２，２
２は受信端に近い側Ｒに接続される。子局２から
子局１への情報の伝達、子局１から子局２への情
報の伝達、のいずれにおいても親局を通過しない
ため、同期ずれ補正による遅延時間を生じない。
しかるに、従来のヘアピン形ループ方式において
は、送信端子側において任意の空きスロツトを捕
捉し、該スロツトに情報を書き込み、伝送を行な
うため、たとえばデータ収集システムのように、
特定の局に情報が集中するようなシステムに適用
すると、特定の局を基準として伝送方向に関して
上位にある局（子局１）が空きスロツトを捕捉で
きる可能性のほうが下位にある局（子局２）が空
きスロツトを捕捉できる可能性よりも大であつ
て、下位にある局（子局２）は不利となる。その
ために、下位にある局（子局２）における待合わ
せ時間は増大する。このように、空きスロツト割
当てにおいて不公平が生ずる。 To explain this with reference to FIG. 2, the transmitting end and receiving end of a unidirectional transmission line 4 are connected to the master station 3, and the slave stations 1 and 2 are connected to this transmission line. The transmitting terminals 11 and 21 of each slave station are connected to the side T near the transmitting end of the transmission line, and the receiving terminals 12 and 2 of each slave station are connected to the side T near the transmitting end of the transmission line.
2 is connected to side R near the receiving end. Since the transmission of information from the slave station 2 to the slave station 1 and the transmission of information from the slave station 1 to the slave station 2 do not pass through the master station, no delay time due to synchronization shift correction occurs.
However, in the conventional hairpin loop method, an arbitrary vacant slot is captured on the transmission terminal side, information is written into the slot, and transmission is performed.
When applied to a system in which information is concentrated at a specific station, the higher station (slave station 1) with respect to the transmission direction has a higher probability of capturing an empty slot than the lower station (slave station 1). 2) is greater than the possibility of capturing a vacant slot, and the lower station (slave station 2) is at a disadvantage. Therefore, the waiting time at the subordinate station (slave station 2) increases. In this way, inequity occurs in free slot allocation.
本発明の目的は、上述の従来技術における問題
点に対処するため、各タイムスロツトにおける予
約ビツトの書き込みを各子局の送信端子および受
信端子の両方から行えるようにし、タイムスロツ
ト割当ての合理化を行つてヘアピン形ループ方式
の情報伝送系における情報伝送の改善をはかるこ
とにある。
SUMMARY OF THE INVENTION An object of the present invention is to enable writing of reserved bits in each time slot from both the transmitting terminal and the receiving terminal of each slave station, and to rationalize time slot allocation in order to address the problems in the prior art described above. The purpose of this invention is to improve information transmission in a hairpin loop type information transmission system.
本発明においては、親局に単方向伝送回線の送
信端および受信端が接続され、該伝送回線に複数
の子局の送信端子が該伝送回線の送信端に近い側
に、該複数の子局の受信端子が該伝送回線の受信
端に近い側に接続され、該子局からの情報は該伝
送回線の空きタイムスロツトの捕捉によつて伝送
されるヘアピン形ループ方式情報伝送系におい
て、各タイムスロツト上に予約ビツトを設け、該
予約ビツトの書込みは該各子局の送信端子および
受信端子の両方から行うようにし、書込み可能の
空タイムスロツトが送信端子側と受信端子側とで
区別されていることを特徴とする、ヘアピン形ル
ープ方式情報伝送系におけるタイムスロツト割当
て方式が提供される。
In the present invention, the transmitting end and the receiving end of a unidirectional transmission line are connected to the master station, and the transmitting terminals of the plurality of slave stations are connected to the transmission line on the side closer to the transmitting end of the transmission line. In a hairpin loop type information transmission system, the receiving terminal of the slave station is connected to the side near the receiving end of the transmission line, and information from the slave station is transmitted by capturing an empty time slot of the transmission line. A reserved bit is provided on the slot, and writing of the reserved bit is performed from both the transmitting terminal and the receiving terminal of each slave station, and empty time slots that can be written are differentiated between the transmitting terminal side and the receiving terminal side. A time slot allocation method in a hairpin loop information transmission system is provided.
本発明の実施例を第１図を用いて説明する。子
局１から子局２へ情報を送るものとする。
An embodiment of the present invention will be described with reference to FIG. Assume that information is sent from slave station 1 to slave station 2.
子局１の動作。 Operation of slave station 1.
１ 送信端子１１および受信端子１２はスロツト
監視機能を有し、それぞれA1，B1においてス
ロツトを監視している。1. The transmitting terminal 11 and the receiving terminal 12 have a slot monitoring function, and monitor the slots at A 1 and B 1 , respectively.
２ 送信端子側では奇数番目のフレーム内、受信
端子側では偶数番目のフレーム内を調べ、先頭
ビツトが０である空スロツトを探す。2 Check the odd-numbered frames on the transmitting terminal side and the even-numbered frames on the receiving terminal side to find an empty slot whose leading bit is 0.
３ 空スロツト、たとえば＃３、を見出すと、先
頭ビツトを１に変えることによつてスロツト
＃３を予約し、他の子局または親局の該スロツ
トの使用を禁止する。3. When an empty slot, for example #3, is found, the first bit is changed to 1 to reserve slot #3 and prohibit other slave stations or master stations from using the slot.
送信端子側で空スロツトを見出た場合。先
頭ビツトを１にすると同時に、該スロツトに
送信局名、受信局名および送信すべき情報を
書き込む。 If an empty slot is found on the transmitting terminal side. At the same time as setting the first bit to 1, the transmitting station name, receiving station name, and information to be transmitted are written into the slot.
受信端子側で空スロツトを見出した場合。
先頭ビツトを１にし、他の子局または親局の
該スロツトの使用を禁止する。しかしなが
ら、受信端子側では情報の書き込みは不可能
である。よつて、１フレーム後の同一スロツ
ト、すなわち＃３スロツトに送信局名、受信
局名と共に送信すべき情報を書き込む。 When an empty slot is found on the receiving terminal side.
The first bit is set to 1, and other slave stations or master stations are prohibited from using the slot. However, information cannot be written on the receiving terminal side. Therefore, the information to be transmitted along with the transmitting station name and receiving station name is written in the same slot one frame later, ie, #3 slot.
４ 送信すべき情報の量が複数のスロツトにわた
る場合には、送信すべき最後の情報を書き込ん
だフレームの＃３スロツトのＣ／Ｆビツトを１
にセツトし、該情報を含む最終スロツトである
ことを示す。これ以外の場合には、Ｃ／Ｆビツ
トを０にし、該情報が次フレームの＃３スロツ
トに続くことをあらわす。4 If the amount of information to be transmitted spans multiple slots, set the C/F bit of #3 slot of the frame in which the last information to be transmitted is written to 1.
is set to indicate that this is the last slot containing this information. In other cases, the C/F bit is set to 0, indicating that the information continues in #3 slot of the next frame.
５ 送信すべき情報の量が１スロツト内におさま
る場合には、該スロツトは最終スロツトとなる
ため、Ｃ／Ｆビツトを１にセツトする。5 If the amount of information to be transmitted fits within one slot, the C/F bit is set to 1, since that slot is the final slot.
子局２の動作
１ 前述のように、情報を含むスロツトには送信
局名および受信局名が書き込まれているから、
受信端子側では各スロツトを監視しており、自
局あてのスロツトであれば、鎖線で示す通信路
１１―A1―A2―B2―２２を経て、該スロツト
の情報を受信する。 Operation 1 of slave station 2 As mentioned above, since the transmitting station name and receiving station name are written in the slot containing information,
Each slot is monitored on the receiving terminal side, and if the slot is addressed to the own station, information on that slot is received via communication paths 11-A 1 -A 2 -B 2 -22 shown by chain lines.
２ 該スロツトにＣ／Ｆビツトを調べ、０であれ
ば、ひきつづき該スロツトを使用することであ
るから、予約ビツトの１をそのままとする。こ
れにより、ループ一巡中における他の子局ある
いは親局の該スロツトの使用を禁止する。2 Check the C/F bit for the slot, and if it is 0, this means that the slot will continue to be used, so the reserved bit 1 is left unchanged. This prohibits other slave stations or the master station from using the slot during one loop.
３ 受信スロツトのＣ／Ｆビツトが１であれば、
送信局からの最後の情報であることをあらわし
ているから、予約ビツトを０に変え、該スロツ
トを解放し、他の局の該スロツトの使用を可能
とする。3 If the C/F bit of the receiving slot is 1,
Since this represents the last information from the transmitting station, the reserved bit is changed to 0, the slot is released, and the slot can be used by another station.
このように、前述の実施例によれば、送信端子
および受信端子の両方から空スロツトの予約が可
能にされ、かつ、送信端子側、受信端子側でアク
セス可能な空スロツトに制限を設けることによ
り、上位局、下位局間の空スロツトのアクセスに
対する機会の均等が実現される。 In this way, according to the embodiment described above, it is possible to reserve an empty slot from both the transmitting terminal and the receiving terminal, and by setting a limit on the empty slots that can be accessed on the transmitting terminal side and the receiving terminal side. , equal opportunity for accessing empty slots between upper and lower stations is achieved.
なお、前述の実施例においては、送信端子側、
受信端子側をそれぞれ奇数番目のフレーム、偶数
番目のフレームに対応させたが、それにかわる形
態として、たとえば、それぞれ同一フレームの前
半分、後半部に対応させる、または、それぞれ同
一フレームの奇数番タイムスロツト、偶数番タイ
ムスロツトに対応させることも可能である。 In addition, in the above-mentioned embodiment, the transmission terminal side,
Although the receiving terminal side corresponds to the odd-numbered frame and the even-numbered frame, respectively, as an alternative, for example, the receiving terminal side may be made to correspond to the first half and the second half of the same frame, respectively, or the receiving terminal side may be respectively made to correspond to the odd-numbered time slot of the same frame. , it is also possible to correspond to even-numbered time slots.
本発明によれば、各タイムスロツトにおける予
約ビツトの書き込みを各子局の送信端子および受
信端子の両方から行うことができ、タイムスロツ
ト割当てが合理化され、ヘアピン形ループ方式の
情報伝送系における問題点の解決に役立つ。
According to the present invention, it is possible to write reserved bits in each time slot from both the transmitting terminal and the receiving terminal of each slave station, thereby streamlining time slot allocation and solving problems in hairpin loop type information transmission systems. This will help solve the problem.
第１図は本発明において用いられるフレームお
よびタイムスロツトを示す図、第２図はヘアピン
形ループ方式の情報伝送系を説明するための図で
ある。
１，２…子局、３…親局、４…伝送路、Ｔ…送
信側、Ｒ…受信側、１１，２１…送信端子、１
２，２２…受信端子。
FIG. 1 is a diagram showing frames and time slots used in the present invention, and FIG. 2 is a diagram for explaining a hairpin loop type information transmission system. 1, 2...Slave station, 3...Master station, 4...Transmission line, T...Transmission side, R...Reception side, 11, 21...Transmission terminal, 1
2, 22...Reception terminal.
Claims (1)
が接続され、該伝送回線に複数の子局の送信端子
が該伝送回線の送信端に近い側に、該複数の子局
の受信端子が該伝送回線の受信端に近い側に接続
され、該子局からの情報は該伝送回線上の空きタ
イムスロツトの捕捉によつて伝送されるヘアピン
形ループ方式情報伝送系において、各タイムスロ
ツト上に予約ビツトを設け、該予約ビツトの書込
みは該各子局の送信端子および受信端子の両方か
ら行うようにし、書込み可能の空タイムスロツト
が送信端子側と受信端子側とで区別されているこ
とを特徴とする、ヘアピン形ループ方式情報伝送
系におけるタイムスロツト割当て方式。1 The transmitting end and receiving end of a unidirectional transmission line are connected to the master station, and the transmitting terminals of the plurality of slave stations are connected to the transmission line on the side closer to the transmitting end of the transmission line, and the receiving terminals of the plurality of slave stations are connected to the transmission line. In a hairpin loop information transmission system, which is connected to the side near the receiving end of the transmission line, and in which information from the slave station is transmitted by capturing vacant time slots on the transmission line, the information is transmitted on each time slot. A reserved bit is provided, and writing of the reserved bit is performed from both the transmitting terminal and the receiving terminal of each slave station, and it is ensured that empty time slots in which writing is possible are differentiated between the transmitting terminal side and the receiving terminal side. A time slot allocation method in a hairpin loop information transmission system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2157278A JPS54114903A (en) | 1978-02-28 | 1978-02-28 | Time slot assigning system in information transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2157278A JPS54114903A (en) | 1978-02-28 | 1978-02-28 | Time slot assigning system in information transmission system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54114903A JPS54114903A (en) | 1979-09-07 |
| JPS6130457B2 true JPS6130457B2 (en) | 1986-07-14 |
Family
ID=12058734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2157278A Granted JPS54114903A (en) | 1978-02-28 | 1978-02-28 | Time slot assigning system in information transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54114903A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59181797A (en) * | 1983-03-31 | 1984-10-16 | Toshiba Corp | Line concentrating and distributing system |
| JPS59191993A (en) * | 1983-03-31 | 1984-10-31 | Toshiba Corp | Line concentration distributing system |
| US9582452B2 (en) * | 2013-06-05 | 2017-02-28 | The Boeing Company | Sensor network using pulse width modulated signals |
-
1978
- 1978-02-28 JP JP2157278A patent/JPS54114903A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54114903A (en) | 1979-09-07 |
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