Multiplex unit with means for responding to signal loss in one or more channels
AssigneeSiemens Aktiengesellschaft
InventorHorst Mueller
Life of this patent
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Abstract
A multiplex unit for multiplexing plesiochronous digital signals has a monitoring device for signalling the loss of input signals on one or more channels being multiplexed. Upon recognition of a lost signal in one or more channels, an alarm indication signal is substituted for the information signals in that channel and a synthetic justification signal is produced which replaces the justification information in such channel. The synthetic justification information gives the alarm indication signal the correct pulse repetition rate in the outgoing channel of the multiplex unit.
Claims6
In a multiplex unit for interleaving plesiochronous signals in plural channels with justification signals for accommodating variations in the pulse repetition rate of incoming channels, the combination comprising;
- a monitoring unit for monitoring signals in said channels and for producing a signal in response to the loss of signals in one or more of said channels, means for generating synthetic justification information, means for generating an alarm indication signal, and change-over means responsive to said monitoring unit for inserting said synthetic justification information and said alarm indication signal into the output signal of said multiplex unit in place of signals in said one or more channels.
Dependencies are inferred from the claim text.