JPS5963839A - Regenerative repeating device - Google Patents

Abstract

PURPOSE:To improve the using efficiency of a whole network and also to improve throughput by separating and using a single network dynamically and time-sharingly in each common transmission line. CONSTITUTION:A preamble 202 of a packet 200 is sent to a transmitting line 104S through a multiplexer 108-1. A destination checking part 106-1 checks an REP bit 204 of the packet 200 and discriminates that the packet 200 should be sent to a bus different from the bus in which a transmitting node is included. Therefore, a controlling part 114 holds the status of the multiplexer 108-1 as it is and regeneratively repeats the remaining part of the packet 200 to the transmitting line 104S. Thus, the packet 200 is sent said other bus and entered by a destinated node.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a regenerative repeater, and more particularly, to interconnecting multiple transmission lines (buses) to which a plurality of communication terminals (nodes) are commonly connected. The present invention relates to a regenerative relay device (repeater) that regenerates and relays information signals.

For example, in a local communication network installed on a user's premises, communication terminal devices (workstations) are commonly connected through multiple intermediate taps of coaxial cables via transmitting/receiving devices (transceivers), and each communication terminal device is independent. Communicate information signals to others! A so-called C8MA/CD system is known in which data is transmitted to the h1 terminal device, and in the event of a transmission collision between the terminal devices, each terminal device suspends transmission and retransmits after a random waiting time. This coaxial cable has a cable length of about 500 m to 2 km, for example, and a transmission band of about 20 MHz.
A baseband signal is transmitted. The information to be transmitted includes images, audio, and data, and is assembled into block blocks such as packets, to which control codes such as destination addresses and change codes are added.

Such a coaxial cable is, for example, 10 megabits/
Since the baseband bus is being transmitted at a transmission rate of 1/2 seconds, the cable length is limited to at most IK+n or 2 km to keep the signal degradation within acceptable limits. If a longer transmission distance is required, two systems of coaxial cables are connected to each other using an internal relay device to perform live relay of the Noculus signal.

In a local network like this, where multiple buses are connected to each other by repeaters to form a single bus-type network as a whole, data transmitted from a certain node,
The packet is transmitted throughout the network regardless of its destination. For example, a signal transmitted from a node accommodated in one bus system to a node accommodated in another system bus is regenerated and relayed by a repeater and transferred from one bus to the other bus. However, in this method, packets transferred between two nodes belonging to the same bus system are also regenerated and relayed to all other buses via repeaters. In this way, every foot will have exclusive access to the entire network for a certain amount of time.

The present invention eliminates the drawbacks of such technology, and improves the throughput of the entire network by preventing communication between communication terminals belonging to a common transmission path of the same system from interfering with communication on the common transmission path of other systems. The purpose is to provide an internal live relay device that can perform

This object is achieved by the following regenerative repeater according to the present invention. In other words, this device is a regenerative relay device that interconnects a plurality of transmission paths to which a plurality of communication terminals are commonly connected, and regenerates and relays information signals between the respective transmission paths. , includes a relay indication signal indicating whether or not the information signal is an information signal that is regenerated and relayed from the transmission path to another transmission path via a regenerative repeater, a regenerative relay circuit that regenerates and relays the information signal received from one of the plurality of transmission paths to another transmission path; an identification circuit that identifies a relay display signal of the information signal received from one of the plurality of transmission paths; A control circuit that controls a regenerative relay circuit to stop regenerative relaying of the information signal to other transmission paths when the identified relay display signal indicates that it is an information signal that will not be regeneratively relayed to other transmission paths. This includes:

Next, embodiments of the regenerative repeater according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram showing an example of a local communication network to which a regenerative repeater according to the present invention is applied.

This bus type network is composed of buses 10A, 10B, and 10C as common transmission paths for multiple (for example, three) systems, and buses IOB and 10C are connected to bus 10A by regenerative repeaters (repeater) 100, respectively. . The number of buses and regenerative repeaters is an example and is not limited to this. Buses 10A, 10B and 10C may be PI lll cables or may be fiber optics.

Each bus 10A, 10B and 10C has multiple (
For example, the node 12 of 2) is connected. Although the appeal bus is shown as containing two nodes for purposes of illustration, it is not limited to this number; any other number of nodes may be accommodated on each bus and still The number may be different for each bus. Node 12 may be a processing device such as a host computer and functions as a communication terminal of the network.

In this embodiment, data transmitted through the network is assembled and disassembled into pieces at each node 12. the·? An example of the Kent format is shown in FIG.

This ・Gukeso l-200 includes a preamble 202 of an appropriate length including a synchronization bit and a sync bit, a RE'P (relay) bit 204, which will be described later, and a destination node 1.
2, a source address 208 indicating the address of the source node 12, data 21o1 to be transmitted, and an error control code 212 such as a cyclic redundancy check (CRC) code.

The RFP pin following the serial pull 202 is a relay indication bit that indicates whether the destination node 200 is accommodated on the same bus as the source node. This means that when assembling the PAGAS 200 at each node 12, for example, it sets "1" when transmitting to a destination node on the same bus, and sets, for example, "o" when transmitting to a destination node on a different bus. .

In a network in which the regenerative repeater 1oo according to the present invention is applied, data is transmitted from node B-1 to node A-1.
Noquent 200 addressed to is transferred from bus 10B to 1OA through regenerative repeater A-B, and is not transferred to bus 1oc. Still, the packet l-200 addressed from node B-1 to node C-1 is transferred from bus 10B to bus 10A to bus 10C via regenerative repeaters A-B, r, and A-c. Packet 200 addressed from node B-1 to node B-2 is not transferred to other buses fOA or 10C.

Before explaining the configuration of the regenerative relay device 100 that realizes such a function, problems with the conventional system will be mentioned. Assuming that the regenerative repeater 100 is of the conventional type, for example, a message sent from node B-1 to another node B-2 on the same bus 10B is transmitted to regenerative repeaters A-B and A-C. It is also transferred to the other bus IOA 10C, during which time it monopolizes the entire network. In this way, if each bus is not exclusively owned by Kent in ways that are unrelated to its own bus, each bus can be
Since it can be effectively used for transferring data, the throughput of the entire project will increase.

The regenerative repeater 100 according to the present invention solves this problem by not transferring packets arriving and departing between nodes on the same bus to other buses, and aims to eliminate through-the-clock transmission. An example of the configuration of such a regenerative relay device 100 is shown in FIG.

The regenerative repeater 100 in FIG. 2 is provided between buses 10A and 10B, and the regenerative repeater A-C between buses 10A and 10B may have a similar configuration. The device 100 includes destination check units 106-1 and a multiplexer 108-1 connected to a reception line 102R connected to the bus 10A and a transmission line 104S connected to the bus IOB.

The destination check unit 106-1 is an identification circuit that checks the RFP bit 204 included in the packet l-200 to determine whether the packet received on the reception line 102R is to be transmitted to the transmission line 104S. Multiplexer 10B-1 receives the bucket from receiving line 102R! -2
This circuit relays 00 live to the transmission line 102S, and sends the JAM signal generated by the JAM signal generator 110-1 to the transmission line 104S as described later.

The device 1001d also has a collision detection port 112-1 for detecting the carrier level of, for example, the bus 10A''2 and detecting a collision between transmission and reception on the bus 10AJ2.

As shown in the figure, one set of each of these circuit sections is also provided for the reception line 104R on the bus 10B side and the transmission line 102S on the bus 10A side. is shown.

This device has a control section 114 that controls each of these sections.This control section 114 controls the following:
Internal relay control of the packet 200 by the device 100 is performed.

If the packet 200 addressed to the bus 1 [IA's node A-i is addressed to the bus ion's node B-i, the reproducing relay device 10
0 is received from the reception line 102R. First, the )0 reamble 202 of the packet 202 is passed through the multiplexer 10B-1 to the transmission line 10. It is sent to IS.

Next, the destination check section 106-1 checks the destination check section 71/200.
Check this bucket)
200 is to be sent to a bus 10B different from the bus 10A to which the sending node A-1 belongs.

Therefore, the control unit 114 maintains the state of the multiplexer 10B-1 as it is, and regenerates and relays the remaining portion of the packet 200 to the transmission line 104S.

In this way, the packet 200 is sent to the *'< space 10B and is taken in by the destination node B-1.

At this time, if a collision occurs on bus 10B, any node accommodated on bus 10B, in this case B-1 or B=2, starts transmitting another z4/)-t. If an attempt is made to do so, the collision detection device 112-2 detects this and notifies the control unit 114 of the occurrence of the collision. Control unit 11
4 activates the JAM signal generator 110-2 in response to this, generates a JAM signal,
-2 to the transmission line 102S of the stream 10A. As a result, node A-1 learns of the occurrence of a collision.

In this way, packet transfer between different buses 10A and 10B is performed.

By the way, in the case of a bucket) 200 addressed from node A-1 to node A-2 on the same bus, for example 10A, this device 100
works as follows.

First, the preamble 202 of this bucket) 200 is relayed from the reception line 102R to the transmission line 104S through the multiplexer 108-1.

The R of the packet 200 from the Hyunuma Elephant 102R
When E Pino l-204 is received, the destination check unit 1
06-1 checks the R'E'P bit 204, determines that there is no need to relay this /Fkeken 200 internally to the bus 10B, and reports this to the control unit 114.

The control unit 114 responds to the multiplexer 108-1.
and 108-2 to prevent the remaining portion of subsequent packets 200 from being transmitted to transmission line 104S. This means that bus 10A is separated from bus 10B. The control unit 114 monitors the state of the bus 10A, and controls the multiplexer 10 until the end of the transmission of this IP Keken 200.
B-1 and 108-2 remain deenergized. Meanwhile, on the other bus 10B, for example, node B-1
If an attempt is made to transfer another packet I-200 between the bus 10 and B-2, the regenerative repeater 100 is afraid
No relay to A.

Similarly, in a state where buses 10A and 10B are separated, for example, bus IO from node B-1 of bus 10B is
When an attempt is made to transmit a packet to node A-2 of A, this is also not relayed by the regenerative relay device 100. In the destination check unit 106-2, the receiving line 104 on the bus 10B side
When this is detected by the REP bus 204 received from R, the control unit 114 activates the JAM signal generator 10B-1 and outputs the JAM signal to the bus 10B through the multiplexer 108-1.
Sends a JAM signal to the side. This JAM signal is used to notify node B-1 that the regenerative repeater 100 is in a state in which relay is not possible, as in the case of a collision. When the separated state between buses 10A and 10B is released, packet relaying is resumed.

In this embodiment, the destination check unit 106 checks the REP bit 204 of the /'P address 200 and
By the time 10B and 10B are separated, the preamble 202 of the 1-200 is relayed from one bus to the other by multiplexer 108. (Thus, there is a possibility of collision with other transmissions on the other bus, but if a collision occurs, this can be avoided by performing normal retransmission processing for collisions.)

In this way (7), in a bus network including the regenerative repeater 100 according to the present invention, for example, for packet transmission between nodes B-1 and B-2, the packet 20
Since the REP bit 204 of 0 is ``1.
200 is not transferred. Therefore, the other buses 10A and OC are held in an idle state, and the nodes A-1, A-2, C-1 and C belonging to buses 10A and 10C are kept idle.
- It is possible to perform different transmissions between the two.

According to the present invention, the fhk system is configured with a plurality of common transmission paths.
networks are dynamically and time-divisionally separated and used in units of common transmission lines. Therefore, the utilization efficiency of the entire network is increased and the throughput is improved. This method is particularly effectively applied to systems in which the communication traffic within the same bus is relatively high compared to that between buses.

Further, the separation of the transmission path by the regenerative repeater is performed in response to the relay indication signal, ie, the REP bit included in the . Such a transmission path separation function can be achieved by configuring the regenerative repeater to identify the source address and destination address, but in the present invention, this is achieved using a relay indication signal included in the packet. This has the advantage that the configuration of the regenerative repeater does not become complicated. Since the configuration of the regenerative repeater does not become complicated, the present invention can be effectively applied to large-scale networks that require a large number of regenerative repeaters.

Although the regenerative repeater according to the present invention has been described with reference to a specific embodiment 1', the present invention is not limited thereto.

For example, when connecting three or more common transmission lines to each other,
The present invention can also be applied to a 11J live broadcasting device. Furthermore, in the above-mentioned embodiment, the configuration was such that reproduction relay to other buses could be stopped on a single bus basis, but between multiple buses? Even in the case of normal transfer, the regenerative repeater may be configured to separate buses that are unrelated to this transfer. In such a case, the R of the Yaguto 200 shown in Fig.
The EP bit 204 consists of multiple digit bits, and these bits can indicate the bus to which a packet to be transferred between buses relates. For example, in the embodiment of FIG. 1, two bits are assigned to RFP pick l-204,
When transferring within the same bus, r-111, bus 10B, 10
“OO” for transfers across A and 10C, bus 1
When between o and A%10B, "01", ・gus10A11
When it is between 0C, "10" may be set. In this way, for example, from No. 10B to 1OA.
If the packet is not being transferred, the regenerative repeater AC can prevent the packet from being transferred to the bus 10C. In larger networks, RF
The same thing can be done by increasing the P bits or the number of digits in the relay display accordingly.

It is also possible to divide the entire network into several regions containing multiple common transmission paths, and perform separation between transmission paths in each region, or separate transmission paths within each region. good.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram showing an example of a local communication floor sotowork to which the regenerative relay device according to the present invention is applied; FIG. 2 is a block diagram showing an embodiment of the regenerative relay device included in the network shown in FIG. 1; Part: Is diagram S transferred through the network in Figure 1? Gututo's Formatsu I
FIG. 2 is a format configuration diagram showing an example. Explanation of symbols of main parts 10A to 10C...Bus 100...IIj live relay device 106...Destination check unit 108...Multiplexer 110...JA, M signal generator 114...Control unit 200...・7gukenoto 204...RF P bit! 1"〒W1-Applicant Riko Co., Ltd.-"-Itohashiri 7 Mountains-1-E Book January 1982/V Bo, 'l li' L4 Official No. 1 Sugi Kazuhiro Tono 1988 Patent Office I No. 173951 3.7 Relationship with 1, 1, and 21 Patent applicant 41 Location: 1-3-6, 1-3-6 Nakamagome, Hitogawa IK, Tokyo
Name (874) Rico Co., Ltd. -44JI+!
Location: 1-13-4 Toranomon Takaranozu Kaikan 7th floor 6, 1-13-4, Minato (Fu Toranomon), Tokyo 105 Contents of Sleeve 11: (1) Day of the book, page 8, lines 6-7 100. Not forwarded." is changed to "Transferred. In this case, it is also forwarded to the Hess IOc via the regenerative repeater A-C."

Claims (1)

[Scope of Claims] In a regenerative relay installation in which a plurality of transmission lines each having a plurality of communication terminals connected in common are connected to each other and information signals between the respective transmission lines are regenerated and relayed, the information signal is: The regenerative repeater includes a relay display signal indicating whether the information signal is an information signal to be regeneratively relayed from the transmission path through which the information signal was transmitted to another transmission path via the regenerative repeater, and the regenerative relay device a regenerative relay circuit that regenerates and relays an information signal received from one of the plurality of transmission paths to another transmission path; and an identification for identifying the relay indication signal of the information signal received from one of the plurality of transmission paths. circuit, and when the identified relay indication signal indicates that it is an information signal that will not be regenerated and relayed to another transmission path, the regenerative relay circuit is controlled to prevent other transmission of the information signal. 1. A regenerative relay device comprising: a control circuit for stopping regenerative relaying to a network.