Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Patent
1998-04-13
2000-06-06
Pham, Chi H.
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
370375, 370401, 370503, H04J 306, H04L 1266
Patent
active
060727942
ABSTRACT:
A digital trunk interface unit for interfacing with a digital trunk of a PSTN in the RAS for connecting the PSTN to a different network by a T1 or E1 trunk, comprises a plurality of line card slots; a plurality of E1 line cards inserted into the line card slots to provide an interface of an E1 trunk; a plurality of T1 line cards inserted into the line card slots to provide an interface of a T1 trunk; a digital switch; an R2 signaling part; a tone generator; a processor; a clock selector; a PLL; a frequency-divider; and a clock converter. Therefore, personal computers of the PSTN connected to the RAS by the trunk interface unit, can be connected to a packet network by a modem unit and a gateway, thereby being provided information services from information providers. Accordingly, the trunk interface unit of RAS can accommodate T1 and E1 trunk links within the same unit by exchanging only line cards, and process the line interface and signaling functions on the same unit, thereby implementing the RAS with low cost.
REFERENCES:
patent: 5124980 (1992-06-01), Maki
patent: 5212688 (1993-05-01), Gerbehy et al.
Daewoo Telecom Co., Ltd.
Pham Chi H.
Yao Kwang B.
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