JPH01172738U

JPH01172738U -

Info

Publication number: JPH01172738U
Application number: JP6901988U
Authority: JP
Priority date: 1988-05-25
Filing date: 1988-05-25
Publication date: 1989-12-07

Description

[Brief explanation of drawings]

第１図は本考案の光バスネツトワークシステム
の第１実施例を示すブロツク図、第２図は同じく
第２実施例を示すブロツク図、第３図は同じく第
３実施例を示すブロツク図、第４図は第３図の衝
突検出回路の構成を示すブロツク図である。１ａ，１ａ′，１ａ″，１ｂ，１ｂ′，１ｂ″
，１ｃ，１ｃ′，１ｃ″…光２分岐結合器、２ａ
，２ａ′，２ａ″，２ｂ，２ｂ′，２ｂ″，２ｃ
，２ｃ′，２ｃ″…端末、３ａ，３ｂ，３ｃ…光
ターミネータ、４ａ，４ｂ，４ｃ…光送信機、５
ａ，５ｂ，５ｃ…光受信機、７ａ，７ｂ，７ｃ…
幹線光フアイバ、８ａ，８ａ′，８ａ″，８ｂ，
８ｂ′，８ｂ″，８ｃ，８ｃ′，８ｃ″…分岐光
フアイバ、１０，１０ｄ，１０ｅ…中央結合部、
１２ａ，１２ｂ，１２ｃ，１２ｄ，１２ｅ…ＯＲ
ゲート、１４…衝突検出回路、１６ａ，１６ｂ，
１６ｃ…立上がりエツジ検出回路、１８ａ，１８
ｂ，１８ｃ…フラグ保持回路、２０…フラグコン
トロール回路、２２…フラグ一致検出回路、ａ，
ｂ，ｃ…サブネツトワーク。 FIG. 1 is a block diagram showing the first embodiment of the optical bus network system of the present invention, FIG. 2 is a block diagram showing the second embodiment, and FIG. 3 is a block diagram showing the third embodiment. FIG. 4 is a block diagram showing the configuration of the collision detection circuit of FIG. 3. 1a, 1a', 1a'', 1b, 1b', 1b''
, 1c, 1c', 1c''... optical two-branch coupler, 2a
, 2a', 2a'', 2b, 2b', 2b'', 2c
, 2c', 2c''...terminal, 3a, 3b, 3c...optical terminator, 4a, 4b, 4c...optical transmitter, 5
a, 5b, 5c...optical receiver, 7a, 7b, 7c...
Trunk optical fiber, 8a, 8a', 8a'', 8b,
8b', 8b'', 8c, 8c', 8c''... Branch optical fiber, 10, 10d, 10e... Central coupling part,
12a, 12b, 12c, 12d, 12e...OR
Gate, 14...Collision detection circuit, 16a, 16b,
16c...Rising edge detection circuit, 18a, 18
b, 18c...Flag holding circuit, 20...Flag control circuit, 22...Flag match detection circuit, a,
b, c...Subnetwork.

Claims

[Claims for Utility Model Registration] (1) For connecting a single optical fiber, each folded in a U-shape, or a pair of optical fibers interconnected at one end, and a plurality of terminals to the optical fiber. a plurality of optical subbus networks each comprising a plurality of optical two-branch couplers connected to the optical fibers, and an optical transmitter and an optical receiver connected to the optical fibers of each of the optical subbus networks. and a plurality of optical subbus networks in a format in which a signal to be supplied to an optical transmitter of one optical subbus network among the plurality of optical subbus networks is obtained only from an output signal of an optical receiver of another optical subbus network. An optical bus network system consisting of coupling means for sending signals to optical transmitters of a sub-bus network. (2) A pair of optical fibers each having a non-reflection/light-shielding treatment at the end thereof and a plurality of optical two-branch couplers connected to the optical fiber to connect a plurality of terminals to the optical fiber. a plurality of optical subbus networks configured, an optical transmitter and an optical receiver connected to optical fibers of each of the optical subbus networks, and one optical subbus in the plurality of optical subbus networks. coupling means for transmitting a signal to the optical transmitters of the plurality of optical subbus networks in a form in which the signal supplied to the optical transmitters of the network is obtained from the output signals of the optical receivers of all the optical bus networks. bus network system. (3) When a plurality of output signals occur simultaneously in response to the output signals of the optical receivers of all the optical bus networks, this is detected as a signal collision, and a collision detection signal is sent to all of the optical transmitters. 3. The optical bus network system according to claim 2, further comprising collision detection means for detecting a collision.