Abstract: The control system of an exchange includes two control facilities of different design which cooperate and communicate in executing switching functions. One of the control facilities executes standard switching tasks by means of real-time control programs, and the other executes other switching tasks by means of non-real-time control programs.

Abstract: In known optical distribution systems, a signal intended for the subscribers is distributed from a transmitting point to all network terminations (point-to-multipoint transmission). The receivers, which are connected to a passive optical network, are adapted to a common bit rate. If a need for a higher data rate arises at a network termination, this need can only be satisfied in the prior art by converting all receivers. This is not possible without interrupting the service. Furthermore, the conversion entails great expense, since the receivers of these network terminations where the need for information is unchanged have to be converted as well. By a time-division-multiplexing method, a time-division multiplex signal is generated which has a frame whose duration is equal to one bit period (T) of a digital signal, and which is divided into k time slots (ZS). At least two time slots (ZS) are used for one digital signal, and one respective time slot (ZS) is used for each of the remaining digital signals.

Abstract: A radio system, particularly a mobile radio system (MRS) is proposed, which has radio interfaces (COMa) with variable parameters (Ta, Fa), which are predetermined and changed by the base station BS. The parameters are computed in the base station on the basis of a requested transmission capacity (CAPr) desired by a remote radio station (MSa), and on the basis of the determination of free transmission capacities (CAPl) within a specified frequency range. The parameters (Ta, Fa) for adjusting the transceivers in the base station and in the remote radio stations are predetermined in such a way, that the desired transmission capacity occupies the fewest possible of the free transmission capacities. An efficient utilization of the frequency spectrum is achieved, where the radio transmission continuously adapts to the capacity requirements of the mobile stations.

Abstract: To test a first device, the latter is connected to a simulator which simulates at least one second device according to a test case stored in a second data set. The simulator sends messages to the first device according to the test case, receives reply messages from the first device, and stores these reply messages in the second data set. According to the invention, the test is stored in advance as an abstract test scenario in a first data set. To generate the test case, the first data set is then mapped to the second data set by means of message-structure data and by insertion of basic-setting data. For evaluation, the second data set is mapped back to the first data set by data reduction.

Abstract: In optical transmission systems with fiber-optic amplifiers, an interruption of the fiber-optic link, e.g., due to fiber breakage, may cause a giant pulse to develop. To prevent the giant pulse from propagating in the fiber-optic link, an optical filter (7) which blocks the wavelength region of the pulse is placed in the fiber-optic link. The wavelength of the optical signal must be chosen to lie outside the wavelength region of the maximum gain of the fiber-optic amplifier.

Abstract: Prior art fiber-optic amplifiers which are used in a fiber-optic link to amplify the light signals to be transmitted have the disadvantage that the semiconductor lasers employed as pump lasers are highly sensitive to feedback, so that the stability of the light-signal transmission is impaired by pump light reflected back into the pump lasers.According to the invention, the operating current for such pump lasers (4) contains a noise current, so that the pump laser emits its pump light in many modes, which makes it insensitive to feedback.To prevent the noise component of the pump light which is caused by the noise current from affecting the amplification of the light signals to be transmitted, the noise current is filtered in such a way that its spectral components have frequencies which lie above the reciprocal lifetime of that energy level of the active laser medium which causes the amplification of the light signals.