Add/drop multiplexer and interface
AssigneeFujitsu Limited
InventorKeiichiro Tsukamoto
Life of this patent
Estimating the term…
Abstract
An add/drop multiplexer where a first signal converter converts first-low-order-group signals received from DSn network, into high-order-group signals, which are transferred to SDH (SONET) network and to which second-low-order-group signals, slower in transmission speed than the first-low-order-group signals are added. A second signal converter converts high-order-group signals, received from SDH (SONET) network, into first-low-order-group signals. A selector selectively outputs first-low-order-group signals received from the DSn network, or first-low-order-group signals obtained by the second signal converter, as the input signals to the first signal converter.
Claims8
An add/drop multiplexer for connection between a first network, on which signals of a first low-order group are transferred at a predetermined speed, and a second network, on which signals of a high-order group are transferred at a higher speed than that of the first-low-order-group signals, said multiplexer comprising:
- (a) a cross-connect for handling cross-connecting of signals to be transferred between the first and second networks in terms of second-low-order-group signals whose transmission speed is slower than that of either the high-order-group signals or the first-low-order-group signals;
- and
- (b) an interface for handling signal transfer to and from said cross-connect in terms of the high-order-group signals;
- said interface including
- (b1) a first signal converter for converting input signals of the first-low-order-group signals into high-order-group signals, which are to be transferred to the second network and to which second-low-order-group signals slower in transmission speed than that of the first-low-order-group signals are added, and outputting the resulting high-order-group signals to said cross-connect,
- (b2) a second signal converter for converting high-order-group signals, which are received from the second network via said cross-connect, into first-low-order-group signals, and
- (b3) a selector for selectively outputting signals of the first low-order group, which are received from the first network, or the first-low-order-group signals, which are obtained by said second signal converter, as the last-named input signals to said first signal converter.
An add/drop multiplexer for connection between a first network, on which signals of a first low-order group are transferred at a predetermined speed, and a second network, on which signals of a high-order group are transferred at a higher speed than that of the first-low-order-group signals, said multiplexer comprising:
- (a) a cross-connect for handling cross-connecting of signals to be transferred between the first and second networks in terms of second-low-order group signals whose transmission speed is slower than that of either the high-order-group signals or the first-low-order-group signals;
- and
- (b) an interface for handling signal transfer to and from said cross-connect in terms of the high-order-group signals;
- said interface including
- (b1) a third signal converter for converting input signals of the first low-order group into the high-order-group signals to be transferred to the second network, and outputting the obtained high-order-group signals to said cross-connect,
- (b2) a fourth signal converter for converting signals of the high-order group, which are received from the second network, into first-low-order-group signals, which are to be transferred to the first network and to which second-low-order-group signals slower in transmission speed than that of the first-order-group signals are added, and
- (b3) a selector for selectively outputting signals of the first low-order-group signals, which are received from the first network, or the first-low-order-group signals, which are obtained by said fourth signal converter, as the last-named input signals to said third signal converter.
An add/drop multiplexer for connection between a first network, on which signals of a first low-order group are transferred at a predetermined speed, and a second network, on which signals of a high-order group are transferred at a higher speed than that of the first low-order-group signals, said multiplexer comprising:
- (a) a cross-connect for handling cross-connecting of signals to be transferred between the first and second networks in terms of second-low-order-group signals whose transmission speed is slower than that of either the high-order-group signals or the first-low-order-group signals;
- and
- (b) an interface for handling signal transfer to and from said cross-connect in terms of the high-order-group signals;
- said interface including
- (b1) a first signal converter for converting input signals of the first low-order group into high-order-group signals, which are to be transferred to the second network and to which second-low-order-group signals slower in transmission speed than that of the first low-order-group signals are added, and outputting the resulting high-order-group signals to said cross-connect,
- (b2) a second signal converter for converting high-order-group signals, which are received from the second network via said cross-connect, into first-low-order-group signals,
- (b3) a third signal converter for converting input signals of the first low-order group into high-order-group signals to be transferred to the second network, and outputting the resulting high-order-group signals to said cross-connect,
- (b4) a fourth signal converter for converting high-order-group signals, which are received from the second network via said cross-connect, into first-low-order-group signals, which are to be transferred to the first network and to which second-low-order-group signals are added, and
- (b5) a selector for selectively outputting first-low-order-group signals, which are received from the first network, or first-low-order-group signals, which are obtained by said second signal converter, as the first-named input signals to said first signal converter,
- said selector being operable also to selectively output signals of the first low-order group, which are received from the first network, or signals of the first low-order group, which are obtained by said fourth signal converter, as the second-named input signals to said third signal converter.
An interface for connection between a first network, on which signals of a first low-order group are transferred at a predetermined speed, and a second network, on which signals of a high-order group are transferred at a higher speed than that of the first low-order-group signals, said interface comprising:
- (a) a first signal converter for converting input signals of the first low-order group into high-order-group signals, which is to be transferred to the second network and to which second-low-order-group signals slower in transmission speed than that of the first low-order-group signals are added, and outputting the resulting high-order-group signals to said cross-connect;
- (b) a second signal converter for converting high-order-group signals, which are received from the second network, into first-low-order-group signals;
- and
- (c) a selector for selectively outputting first-low-order-group signals, which are received from the first network, or first-low-order-group signals, which are obtained by said second signal converter, as the last-named input signals to said first signal converter.
An interface for connection between a first network, on which signals of a first low-order group are transferred at a predetermined speed, and a second network, on which signals of a high-order group are transferred at a higher speed than that of the first low-order-group signals, said interface comprising:
- (a) a third signal converter for converting input signals of the first low-order group into the high-order-group signals to be transferred to the second network;
- (b) a fourth signal converter for converting high-order-group signals, which are received from the second network, into first-low-order-group signals, which are to be transferred to the first network and to which second-order-group signals slower in transmission speed than that of the first-order-group signals;
- and
- (c) a selector for selectively outputting first-low-order-group signals, which are received from the first network, or first-low-order-group signals, which are obtained by said fourth signal converter, as the last-named input signals to said third signal converter.
An interface for connection between a first network, on which signals of a first low-order group are transferred at a predetermined speed, and a second network, on which signals of a high-order group are transferred at a higher speed than that of the first low-order-group signals, said interface comprising:
- (a) a first signal converter for converting input signals of the first low-order group into high-order-group signals, which is to be transferred to the second network and to which second-low-order-group signals slower in transmission speed than that of the first-low-order-group signals;
- (b) a second signal converter for converting high-order-group signals, which are received from the second network, into first-low-order-group signals;
- (c) a third signal converter for converting input signals of the first low-order group into high-order-group signals to be transferred to the second network;
- (d) a fourth signal converter for converting high-order-group signals, which are received from the second network, into first-low-order-group signals, which are to be transferred to the first network and to which second-order-group signals are added;
- and
- (e) a selector for selectively outputting first-low-order-group signals, which are received from the first network, or first-low-order-group signals, which are obtained by said second signal converter, as the first-named input signals to said first signal converter;
- said selector being operable also to selectively output first-low-order-group signals, which are received from the first network, or first-low-order group signals, which are obtained by said fourth signal converter, as the second-named input signals to said third signal converter.
Dependencies are inferred from the claim text.