公开(公告)号：JPH11298534A

公开(公告)日：1999-10-29

申请号：JP6596999

申请日：1999-03-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DOSHI BHARAT TARACHAND ,  DRAVIDA SUBRAHMANYAM ,  HERNANDEZ-VALENCIA ENRIQUE ,  MATRAGI WASSIM A ,  QURESHI MUHAMMED AKBER

IPC: H04L7/04 ,  H04L7/08 ,  H04L12/56 ,  H04L29/06 ,  H04L29/08 ,  H04Q11/04

Abstract: PROBLEM TO BE SOLVED: To realize a simple point-to-point data link protocol(SDL) based on the use of a length indicator field and an error check field not on the use of a flag to recover a packet border in a receiver. SOLUTION: An SDL transmitter 105 sends an SDL packet consisting of a header and a PDU (payload) of a variable length. The header consists of a length indicator (L1) field, a type field and a cyclic redundancy check CRC field. A receiver 150 blocks a packet as a function of the LI field to conduct self-synchronization as functions of the LI field and the header CRC field, that is, recovers the packet. In the recovering the packet especially, the receiver 150 applies CRC check to each reception SDL packet header and declares synchronization after the check by N times (e.g. N=4) is correct.

公开(公告)号：JPH10341242A

公开(公告)日：1998-12-22

申请号：JP10225498

申请日：1998-04-14

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALDWIN JOHN HENRY ,  DOSHI BHARAT TARACHAND ,  DRAVIDA SUBRAHMANYAM ,  JIANG HONG ,  MATRAGI WASSIM A ,  NANDA SANJIV

IPC: H04Q3/00 ,  H04L12/56 ,  H04Q7/38 ,  H04Q11/04 ,  H04L12/28

Abstract: PROBLEM TO BE SOLVED: To switch an ATM connection of an ATM adaptive layer AAL-2 packet to other ATM connection in a sub ATM cell level such as logic link connection(LLC) by bundling again the ATM adaptive layer AAL-2 packet in the case that a plurality of sources and a destination are included in connection among a plurality of termination nodes. SOLUTION: An LLC server 200 bundles again two LLC packets according to two transfer tables each denoting each direction of communication and the packets are divided into two, which arrives at an adaptor TAB205 and outputs from an adaptor TAS215. Each column of the transfer tables maps a specific virtual channel connector(VCC) and a CID through a specific port to a channel IDCID in VCC, then the LLC server 200 bundles again a payload of the LLC packet arrived in the TAS205 into a new LLC packet with a new CID and gives the new LLC packet to a proper port on a designated VCC to switch the packets.

公开(公告)号：CA2262774A1

公开(公告)日：1999-09-06

申请号：CA2262774

申请日：1999-02-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DRAVIDA SUBRAHMANYAM ,  DOSHI BHARAT TARACHAND ,  MATRAGI WASSIM A ,  HERNANDEZ-VALENCIA ENRIQUE ,  QURESHI MUHAMMED AKBER

IPC: H04L7/04 ,  H04L7/08 ,  H04L12/56 ,  H04L29/06 ,  H04L29/08 ,  H04Q11/04

Abstract: A simple point-to-point data link protocol (SDL) is defined which is based on the use of a length indicator field and an error check field, rather than a flag, for performing packet boundary recovery in a receiver. In an embodiment of the invention, an SDL transmitter transmits SDL packets comprising a header and a variable length payload. The SDL header comprises a length indicator (LI) field, a type field and a cyclic redundancy check (CRC) field. For receiving these transmitted SDL packets, SDL supports the use of a self-synchronization/self-delineation technique in the receiver. The receiver performs self-delineation as a function of the LI field, and performs self synchronization, or packet recovery, as a function of both the LI field and the header CRC field. In particular, in performing packet recovery, the receiver performs a CRC check over each received SDL packet header and synchronization is declared after N correct checks, e.g., N = 4. The SDL receiver operates in a hunt made when performing synchronization, and a normal mode when synchronization has been accomplished.

公开(公告)号：CA2232320A1

公开(公告)日：1998-10-14

申请号：CA2232320

申请日：1998-03-17

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BALDWIN JOHN HENRY ,  DOSHI BHARAT TARACHAND ,  DRAVIDA SUBRAHMANYAM ,  MATRAGI WASSIM A ,  JIANG HONG ,  NANDA SANJIV

IPC: H04Q3/00 ,  H04L12/56 ,  H04Q7/38 ,  H04Q11/04

Abstract: A digital cellular/personal communications service (PCS) application incorporate s a logical link connection (LLC) server. In this approach, there are two ATM conn ections in the path of an AAL-2 connection: one between a base station and the LLC Serve r and the other between the LLC Server and a vocoder group. All LLCs from, or to, a gi ven base station use a common ATM connection irrespective of the vocoder used at the other end. Similarly, all LLCs from, or to, a given vocoder group use a common ATM connection irrespective of the destination base station at the other end. At the LLC Server, LLC packets from many base stations destined for the same vocoder group are extracted and bundled into the ATM connection between the LLC Server and the destination vocoder group. Similar treatment is given to the packets originating at vocoders and destined for base stations. Thus, each ATM connection between a particular base station and the LLC server and each ATM connection between the L LC Server and a particular vocoder group are used to maximum capacity notwithstandi ng each ATM connection conveys LLCs to different LLC endpoints.