摘要:
Switching circuitry for transferring data from an input time-division multiplex system to an output time-division multiplex system includes a transfer circuit for temporarily storing the data received from the input-time-division multiplex system prior to its transfer to the output time-division multiplex system. For controlling the selective transfer of data from an input channel of the input time-division multiplex system to any one output channel of the output time-division multiplex system control circuitry is provided which controls the storage of the input channel data in a selected position of the transfer circuit with a timing corresponding to the respective time slots of the input channel and controls the transfer of that data from the selected position in the transfer circuit to the output time-division multiplex system with a timing corresponding to the respective time slot selected output channel. Write control circuitry stores in a write control memory the selected position in the transfer circuit in a word of the control memory corresponding to the time slot of the input channel in the input time-division multiplex system so that in response to time slots generated by an input time slot generator, the position address of the word in the control memory can be applied to the transfer circuit to control writing of data from the input channel into the transfer circuit in the position selected. Read control circuitry includes a read control memory wherein the selected position in the transfer circuit is stored in a word of that read control memory corresponding to the time slot of the output channel in the output time-division multiplex system so that data in the selected position of the tranfer circuit can be read out to the output time-division multiplex system at the proper time. The read and write control arrangements can also be constituted by elementary control memories connected to elementary inputs or outputs of the input and output multiplex circuitry.
摘要:
Selection switches (C1, . . . , C3-4) enable an optical path (BC, C1, C2-1, C3-1, D1, B1) to be selected from a plurality of such paths predefined on a common substrate (PE), each of the switches belonging to a plurality of such paths for that purpose. Isolation switches (D1, . . . , DN) each belong to one such path only. The isolation switches are disposed at the ends of the paths so as to enable the selected path to be isolated from optical members (LEN) that are outside the selector and that are connected to the non-selected paths. In this way crosstalk is avoided. The invention applies in particular to backing up an optical link.
摘要:
The connection system includes at least one connection assembly having at least one connection module with a connection capacity of N optical lines. A connection module comprises first, second, and third optical switch assemblies (C11 to C1n, C21 to C2n, and C31, C32). The first assembly is connected to the N optical lines, the second assembly is connected firstly to the first assembly and secondly to the junctors and the spare junctors associated with the N optical lines, and the third assembly is connected firstly to the first assembly and secondly to at least one test circuit via a line test optical fiber and via a junctor test optical fiber. When using narrowband optical switches, there are two switching assemblies, one for transmission and the other for reception of the signals conveyed by the optical lines, when using wideband optical switches, then a single switching assembly is used both for transmission and for reception, i.e. for both call directions.
摘要:
The diffuser is made from N=2.sup.n light ducts divided into two sets of 1/2N ducts, with every other duct belonging to a different one of the sets. The two sets of ducts are helically wound in opposite directions but at the same helical pitch over a cylinder (1). Each duct in either set crosses over the 1/2N ducts in the other set, and couplers are provided at those cross-overs between any given duct and the 1/2N ducts of the other set having cross-over numbers 2.sup.q, where q=0, 1, 2, . . . , (n-1). The diffuser has stages each comprising 1/2N couplers, with each stage being disposed in a ring around the cylinder.