Multiplex communications – Wide area network – Packet switching
Patent
1994-04-28
1995-12-26
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
370 942, 3701101, H04L 1266
Patent
active
054794056
ABSTRACT:
The invention is an adaptor which permits using a digital telephone device with an incompatible telephone network access. In its most preferred embodiment, the present invention is an adaptor which permits an ISDN telephone device to exchange digital data with two Switched-56 Access. An ISDN Basic Rate Access interface circuit interfaces with the ISDN telephone device, while two Switched-56 Access interface circuit interfaces with two Switched-56 Access. The adaptor also includes a clock recovery circuit for synchronizing digital data transfers occurring between the ISDN Basic Rate Access interface circuit and the ISDN telephone device with the digital data transfers occurring between the Switched-56 Access interface circuit and the Switched-56 Access. In an alternative embodiment, the clock recovery circuit synchronizes digital data transfers between the ISDN Basic Rate Access interface circuit and the Switched-56 Access interface circuits rather than conversely as in the preferred embodiments so a Switched-56 telephone device may exchange digital data with an ISDN Basic Rate Access.
REFERENCES:
patent: 4979169 (1990-12-01), Almond et al.
patent: 5251207 (1993-10-01), Abensour et al.
Koz Mark C.
Lix Jack W.
Chin Wellington
Koz Mark C.
Schreiber Donald E.
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