Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2007-01-23
2007-01-23
Ngo, Ricky Q. (Department: 2616)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S413000, C370S350000, C370S389000, C370S395700, C370S395710, C370S347000, C370S392000, C370S398000, C370S399000, C370S422000, C370S345000
Reexamination Certificate
active
10022622
ABSTRACT:
An apparatus and method for recovering abnormal control cells in an asynchronous transfer mode (ATM) exchange subscriber unit. A signal cell or control cell is transmitted and a plurality of reception first-in first-out memories (FIFOs) are sequentially checked to determine whether a new cell has arrived. If there is no start of cell (SOC) signal in an initial byte of a current cell under the condition that a cell synchronization loss signal is present in the current cell, or if the SOC signal is detected during transfer of the current cell, the current cell is determined to be abnormal. If the cell synchronization loss signal is abnormal, the current cell is discarded and an associated FIFO is fully emptied to recover cell synchronization. According to the invention, an internal control cell having a command to be transferred to an ATM exchange subscriber interface, and subscriber interface state information to be reported to a controller, and a signal cell for call control between ATM exchanges are recovered rapidly and effectively when being abnormally transferred to the subscriber interface. Therefore, the subscriber interface can fundamentally be prevented from being erroneously operated and falling into an operation disable state, thereby enhancing stability of the subscriber unit.
REFERENCES:
patent: 5974047 (1999-10-01), Kim
patent: 6175567 (2001-01-01), Yoo
patent: 6690670 (2004-02-01), Castellano
patent: 6751233 (2004-06-01), Hann
patent: 6975651 (2005-12-01), Ono et al.
Fleshner & Kim LLP
Haile Feben Micael
LG-Nortel Co., Ltd.
Ngo Ricky Q.
LandOfFree
Apparatus and method for recovering abnormal control cells... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for recovering abnormal control cells..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for recovering abnormal control cells... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3721556