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US006631436B1
(12) United States Patent ao) Patent No.: us 6,631,436 Bi
Liu et al. (45) Date of Patent: Oct. 7,2003
(54) PLATFORM FOR SELECTIVELY
PROVIDING A CHANNEL SERVICE UNIT/
DATA SERVICE UNIT, A ROUTER/BRIDGE,
AND A DIAL-UP MODEM
(75) Inventors: Sheng-Wei Liu, San Chung (TW);
Tsai-Kuen Chan, San Chung (TW)
(73) Assignee: Comptrend Compound, Taipei Hsien (TW)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 482 days.
(21) Appl. No.: 09/652,885
(22) Filed: Aug. 31, 2000
(51) Int. CI.7 G06F 13/00
(52) U.S. CI 710/305; 375/222
(58) Field of Search 710/12, 14, 22,
710/300, 301, 105, 305, 308, 317; 709/250;
711/105; 375/222; 379/88.17, 88.13, 93.14,
100.12, 900, 908, 74; 370/908, 910, 911
(56) References Cited
U.S. PATENT DOCUMENTS
4,885,741 A * 12/1989 Douskalis
