MODEM SHARING APPARATUS

Brand	Owner	Address	Description
UNIVERSAL DATA SYSTEMS	Universal Data Systems, Inc.	4900 Bradford Dr. Huntsville AL 35805	MODEM SHARING APPARATUS; AUTOMATIC CALLING UNITS; DUAL-DIAL BACKUP UNITS; PROTOCOL CONVERTERS; ERROR CONTROLLERS; DIGITAL DATA SERVICE NETWORK PRODUCTS - NAMELY, DATA SERVICE UNITS AND CHANNEL SERVICE UNITS; MULTIPLE MODEM ASSEMBLIES AND EQUIPMENT RACKS; LINE DRIVERS; AND MULTIPLEXERS;DATA SYSTEMS;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

Conventional modems coupled in parallel to a coupling need a sharing apparatus, which can be avoided by providing each modem with a detector for detecting upstream/downstream signals to be transceived by other modems coupled in parallel. The detector has a distinguisher for distinguishing upstream signals and downstream signals. An additional filter between the coupling and detector prevents the modem from interfering with the other modems coupled in parallel. The modem may have an active/passive state corresponding with a lower/higher impedance.