Service generator checking apparatus
AssigneeTRW Inc.
InventorJohannes A. R. Moed
Life of this patent
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Abstract
Service generator checking apparatus and a method in a telephone system operating in time frames each consisting of time slots. The apparatus sends a tone sample signal in one frame through a system interface having an input portion and an output portion, and compares the sent tone sample signal with a stored sample in a subsequent frame, thereby verifying that the interface is operational.
Claims20
In a telephone system having an interface including an input portion connected to an input line for receiving input telephone signals and having an output portion connected to an output line for transmitting output telephone signals, said system operating with the telephone signals in time frames each consisting of a plurality of time slots, service generator checking apparatus comprising:
- tone generator means for generating, each time frame, pulse code modulated tone samples for a plurality of tones,
- tone multiplexer means for multiplexing said tone samples onto a common bus each time frame,
- matrix means, connected to receive said tone samples, for connecting a selected one of said tone samples to a selected one of said time slots in each time frame to form a tone sample signal,
- control means, connected to control said matrix means, for specifying said selected one of said tone samples and for specifying said selected one of said time slots,
- store means, connected to said matrix means, for storing said tone sample signal,
- first connection means for connecting said tone sample signal as an input to said output portion whereby said tone sample signal becomes an output signal,
- means for connecting said output signal as an input signal to said input portion whereby said input signal becomes a check signal corresponding to said tone sample signal,
- and comparator means connected to said store means and said input portion for comparing the stored sample signal with said check signal thereby verifying that said interface is operational.
In a telephone system having an interface including an input portion connected to an input line for receiving input telephone signals and having an output portion connected to an output line for transmitting output telephone signals, said system operating with the telephone signals in time frames each consisting of a plurality of time slots, service generator checking apparatus comprising:
- system controller means for specifying a selected one of pulse code modulated tone samples and for specifying a selected one of said time slots, and
- service generator checker apparatus including,
- tone generator means for generating, each time frame, pulse code modulated tone samples for a plurality of tones,
- tone multiplexer means for multiplexing said tone samples onto a common bus each time frame,
- matrix means connected to said common bus, for connecting said selected one of said tone samples to said selected one of said time slots in each frame,
- control means, responsive to said system controller means, connected to control said matrix means,
- store means;
- connected to said matrix means;
- for storing said tone sample signal,
- first connection means for connecting said tone sample signal as an input to said output portion whereby said tone sample signal becomes an output signal,
- means for connecting said output signal as an input signal to said input portion whereby said input signal becomes a check signal corresponding to said tone sample signal,
- and comparator means connected to said store means and said input portion for comparing the stored sample signal with said check signal thereby verifying that said interface is operational.
In a telephone system having an interface including an input portion connected to an input line for receiving input telephone signals and having an output portion connected to an output line for transmitting output signals, said system operating with the telephone signals in time frames each consisting of a plurality of time slots, service generator checking apparatus comprising:
- tone generator means for generating, each time frame, pulse code modulated tone samples for a selected tone,
- matrix means, connected to receive said selected tone sample, for connecting said selected tone samples to a selected one of said time slots in each frame to form a tone sample signal,
- control means, connected to control said matrix means, for specifying said selected tone sample and for specifying said selected one of said time slots,
- store means, connected to said matrix means, for storing said tone sample signal,
- first connection means for connecting said tone sample signal as an input to said output portion whereby said tone sample signal becomes an output signal,
- means for connecting said output signal as an input to said input portion whereby said input signal becomes a check signal corresponding to said tone sample signal,
- and comparator means connected to said store means and said input portion for comparing the stored sample signal with the check signal thereby verifying that said interface is operational.
In a telephone system having an interface including an input portion connected to an input line for receiving input telephone signals and having an output portion connected to an output line for transmitting output telephone signals, said system operating with the telephone signals in time frames each consisting of a plurality of time slots, the method of checking said interface comprising the steps of:
- generating, each time frame, pulse code modulated tone samples for a plurality of tones,
- multiplexing said tone samples onto a common bus each time frame,
- connecting a selected one of said tone samples to a selected one of said time slots in each time frame to form a tone sample signal,
- specifying said selected one of said tone samples and specifying said selected one of said time slots,
- storing said tone sample signal,
- connecting said tone sample signal as an input to said output portion whereby said tone sample signal becomes an output signal,
- connecting said output signal as an input signal to said input portion whereby said input signal becomes a check signal corresponding to said tone sample signal,
- and comparing the stored sample signal with said check signal thereby verifying that said interface is operational.
Dependencies are inferred from the claim text.