Network for connecting a plurality of nodes using a plurality of channels

• US 5,742,585 A
• Filed: 06/04/1996
• Issued: 04/21/1998
• Est. Priority Date: 08/24/1993
• Status: Expired due to Fees

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.), Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hattori, Jun, Yamamoto, Mitsuru
• Primary Examiner(s): Kizou, Hassan
• Application Number:
  US08/657,498
• Time in Patent Office: 686 Days
• Field of Search: 370/16.1, 370/85.5, 370/85.12, 370/85.15, 370/112, 370/222, 370/223, 370/224, 370/225, 370/228, 370/406, 370/535, 340/825.05, 340/827, 359/115, 359/118, 359/119, 359/124
• US Class Current: 370/223
• CPC Class Codes: H04J 14/0204 Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
• CPC Class Codes: H04J 14/0205 Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
• CPC Class Codes: H04J 14/0206 Express channels arrangements
• CPC Class Codes: H04J 14/0213 Groups of channels or wave bands arrangements
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0245 for downstream transmission, e.g. optical line terminal [OLT] to ONU
• CPC Class Codes: H04J 14/0249 for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
• CPC Class Codes: H04J 14/0283 WDM ring architectures
• CPC Class Codes: H04L 12/2852 Metropolitan area networks
• CPC Class Codes: H04L 12/4637 Interconnected ring systems
• CPC Class Codes: H04Q 11/0001 using optical switching

Abstract

In a network system, a loop-shaped transmission path is constituted by multiplexing a plurality of loop-shaped transmission channels. A plurality of nodes are connected to the loop-shaped transmission path. Each of the plurality of nodes can access at least two channels of the plurality of channels multiplexed in the loop-shaped transmission path. Each of plurality of nodes has a loop-shaped transmission route which is formed via a plurality of channels and which does not exceed one round of the loop-shaped transmission path.

Claims

1. A network constituted by connecting a plurality of nodes, comprising:

a loop-shaped transmission path in which a plurality of channels forming a loop-shaped first transmission route are multiplexed;

a plurality of nodes which are connected to said transmission path; and

connection means connected to said transmission path,

wherein each of said nodes belongs to a respective one of a plurality of node groups each constituted by a plurality of said nodes, each of said node groups having two opposite ends and said connection means being arranged at both opposite ends of each of said node groups,

wherein, in each said node group, each of said nodes can access a common channel and a channel other than said common channel from among said plurality of channels as an accessed channel for outputting a signal thereto, but cannot access all of said plurality of channels,

wherein each of said nodes can output a signal inputted from an accessed channel to the same accessed channel from which the signal is input, and

wherein, in each said node group, a signal transmitted through said common channel and input to said connection means at one end of the node group is returned by said connection means and input to said connection means at the other end of the node group, and, in each said node group, each of said nodes is connected to a loop-shaped second transmission route formed of said common channel and said connection means at both ends of the node group.

2. A network according to claim 1, wherein nodes located at both opposite ends of each of said node groups function as said connection means.

3. A network according to claim 1, wherein the connection means of one of said node groups does not substantially output a signal, which was input through said common channel and returned by said connection means, to another node group.

4. A network according to claim 1, wherein one of said first and second loop-shaped transmission routes corresponds to a horizontal loop-shaped transmission route of the Manhattan street transfer network and the other of said first and second loop-shaped transmission routes corresponds to a vertical loop-shaped transmission route of the Manhattan street transfer network.

5. A network constituted by connecting a plurality of nodes, comprising:

a loop-shaped transmission path constituted by multiplexing a plurality of loop-shaped transmission channels, said plurality of channels being divided into a first channel group consisting of at least one channel having a first transmission direction, a second channel group consisting of at least one channel having a second transmission direction opposite to the first transmission direction, and a third channel group consisting of at least one channel not belonging to said first and second channel groups;

a plurality of nodes each of which accesses said first channel group and said third channel group;

connection means for outputting a signal inputted thereto from a channel belonging to said first channel group to a channel belonging to said second channel group, and for outputting a signal inputted thereto from a channel belonging to said second channel group to a channel belonging to said first channel group; and

connection means for outputting a signal inputted thereto from a channel belonging to said first channel group to a channel belonging to said second channel group, and for outputting a signal inputted thereto from a channel belonging to said second channel group to a channel belonging to said first channel group,

wherein a node group is constituted by a plurality of said nodes, said node group having two opposite ends, said connection means is arranged at both opposite ends of said node group, and all of said nodes in said node group are connected to a loop-shaped transmission route formed of said connection means at both opposite ends of said node group and said channels of said first and second channel groups between said opposite ends.

6. A network according to claim 5, wherein said node group is a first node group, and the network further includes a second node group comprising a plurality of nodes each of which accesses at least one channel of said second channel group and at least one channel of said third channel group.

7. A network according to claim 5, wherein said third channel group consists of at least one channel having the first transmission direction and at least one channel having the second transmission direction.

8. A network according to claim 5, wherein at least one node of said node group can access each channel in said third channel group.

9. A network according to claim 8, wherein a number of channels in each of said first channel group and said second channel group is M (=integer), and the connection means for connecting said M channels in said first channel group and said M channels in said second channel group in a one-to-one manner is provided for each of M subgroups.

10. A network according to claim 5, wherein said connection means includes stop means for stopping signals transmitted from the respective channels of said first channel group from being transmitted through the channels of said first channel group beyond said connection means and for stopping signals transmitted from the respective channels of said second channel group from being transmitted through the channels of said second channel group beyond said connection means.

11. A network constituted by connecting a plurality of nodes, comprising:

a loop-shaped transmission path constituted by multiplexing a plurality of loop-shaped transmission channels, said plurality of channels being divided into a first channel group consisting of at least one channel having a first transmission direction and a second channel group consisting of at least one channel not belonging to said first channel group; and

a first node group comprising a plurality of nodes each of which accesses said first channel group and said second channel group,

wherein said first node group is divided into a plurality of subgroups each of which includes a plurality of nodes, each said subgroup having two opposite ends and including a first one of said nodes at one end of said subgroup and a second one of said nodes at the other end of said subgroup, each of said first and second nodes of each subgroup accessing a first common channel among the channels of said first channel group and a second common channel among the channels of said second channel group, the second common channel having a second transmission direction opposite to a transmission direction of the first common channel, and all of said nodes in each subgroup being connected to a loop-shaped transmission route formed of said first and second nodes and said first and second channels.

12. A network according to claim 11, wherein the nodes belonging to one of the subgroups one subgroup and the nodes belonging to another of the subgroups are alternatively connected to said loop-shaped transmission path along said loop-shaped transmission path.

13. A network according to claim 11, wherein no two nodes in each subgroup accesses the same respective channel in said second channel group other than said common channel.

14. A network constituted by connecting a plurality of nodes, comprising:

a loop-shaped transmission path constituted by multiplexing a plurality of loop-shaped transmission channels, said plurality of channels being divided into a first channel group consisting of at least one channel having a first transmission direction, and a second channel group consisting of at least one channel having a second transmission direction opposite to the first transmission direction; and

a plurality of nodes each of which accesses both said first and second channel groups,

wherein when N is an integer, a number of channels in each of said first and second channel groups is N, and said plurality of nodes are grouped into node groups each consisting of 2N nodes, and

wherein in each of the node groups, a p-th node accesses a p-th channel in said first channel group and a p-th channel in said second channel group, a q-th node accesses a (q-N)-th channel in said first channel group and a (q-N+1)-th channel in said second channel group, and a 2N-th node accesses a N-th channel in said first channel group and a first channel in said second channel group, where p and q are integers, and the following condition is satisfied;

1≦

p≦

N, and N+1≦

q≦

2N-1.

15. A network constituted by connecting a plurality of nodes, comprising:

a loop-shaped transmission path in which a first plurality of channels forming a loop-shaped first transmission route are multiplexed;

a plurality of nodes which are connected to said transmission path; and

connection means connected to said transmission path,

wherein each of said nodes belongs to a respective one of a plurality of node groups each constituted by a plurality of said nodes, each of said node groups having two opposite ends and said connection means being arranged at both opposite ends of each of said node groups,

wherein, in each said node group, each of said nodes can access any of a second plurality of channels from among said first plurality of channels as an accessed channel for outputting a signal thereto, the second plurality being less than the first plurality,

wherein each of said nodes can output a signal inputted from an accessed channel to the same accessed channel from which the signal is input, and

wherein, in each said node group, a signal input to said connection means at one end of the node group is returned by said connection means and input to said connection means at the other end of the node group, and, in each said node group, a third plurality of channels from among the second plurality of channels is selected such that each of said nodes is connected to a loop-shaped second transmission route formed of said connection means at both ends of the node group.

16. A network according to claim 15, wherein nodes located at both opposite ends of each of said node groups function as said connection means.

17. A network according to claim 15, wherein the connection means of one of said node groups does not substantially output a signal, which was input through one of said second plurality of channels and returned by said connection means, to another node group.

18. A network according to claim 15, wherein one of said first and second loop-shaped transmission routes corresponds to a horizontal loop-shaped transmission route of the Manhattan street transfer network and the other of said first and second loop-shaped transmission routes corresponds to a vertical loop-shaped transmission route of the Manhattan street transfer network.