Transport network with high transmission capacity for telecommun

Details Transport network with high transmission capacity for telecommun Transport network with high transmission capacity for telecommun

1996-12-10

1998-08-04

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359125, 359137, 385 17, H04J 400, H04J 1400

Patent

active

057902887

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a transport network with a high transmission capacity for telecommunications, in which nodes of the network are transparently linked with one another by optical glass fiber lines in such fashion that a complete functional intermeshing of the nodes is produced that permits simultaneous addressing of every node by every other node in the network.
2. Description of the Prior Art
Such a network is known in the form of a fully intermeshed wavelength-multiplex network with a Star topology (H. Kobrinski, "Crossconnection of Wavelength-Division-Multiplexed High Speed Channels," IEE Electrical Letters, Volume 23, pp. 975-977, Aug. 27, 1987).
In this known network, every node can be addressed by every other node through a central node. The disadvantages of this network configuration are the following: in the event of failure of one of the transmission lines between the individual nodes and the central node, communication with other network nodes is completely interrupted for this node. Data streams from other network nodes cannot be received by this node, nor can data streams be transmitted to other network nodes. In the event of failure of the central node, no communication whatever is possible any longer between individual network nodes. In addition, a serious disproportion can exist between the Euclidean intervals of a node and the nodes adjacent to this node and the transmission line lengths along the optical fiber link through the central node to these nodes.
The goal of the invention is therefore to improve a functionally completely intermeshed telecommunications network of the species recited at the outset in such fashion that its sensitivity to the failure of individual nodes is significantly reduced and the drastic disproportions between the Euclidean distance and the fiber-optic transmission lines become much more favorable.
The network configuration of the invention achieves at least the following functional properties and advantages:
The network configuration according to the invention in matrix topology links every node in the network with at least its two neighbors and thus, in the event of failure of one of the glass fiber cable links connecting the nodes, rerouting the data streams through the remaining connections. For static or approximately static and equally distributed increases in data traffic, full intermeshing provides the largest usable transmission capacity since no transmission capacity need then be provided for the functions of a protocol, to regulate the distribution of the entire transmission capacity of the network at the individual nodes. The functional full intermeshing of this network with matrix topology is achieved by using various optical fibers along a line to address the column of an addressed node and a signal identifier for addressing the line of the same addressed node, the use of a number of transmitters and receivers that corresponds to the number of network nodes, and a permutation of the signal identifiers used for addressing along the lines and columns to avoid collisions. Due to the fact that the signal path of a data stream runs only along the line of the transmitting node and along the column of the receiving node, in a network with regular matrix-type nodes the ratio between the length of the fiber optic transmission line and the Euclidean distance between transmitting and receiving nodes is less than or equal to the square root of2.
An addressing space is used that consists exclusively of a number of differently defined wavelengths that corresponds to the number of network nodes. This offers the advantage that a modulation format can be freely chosen for each of the transmission paths in the network that are specified only in the wavelength.
An addressing space is used that consists exclusively of a number of differently defined periodic time slots that corresponds to the number of network nodes at which the corresponding transmitter and receiver are ready to receive. Operation can proc

REFERENCES:
patent: 5128789 (1992-07-01), Abramovitz
patent: 5465379 (1995-11-01), Li et al.
patent: 5530575 (1996-06-01), Acampora et al.

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