Title:
【発明の名称】マンチェスターコードの符号則違反を用いた衝突検知
Document Type and Number:
Japanese Patent JP2833862
Kind Code:
B2
Abstract:
A collision detection method and apparatus is disclosed for detecting code rule violations in Manchester encoded data packets. The signals delta 0=S2n-S2n-1 delta 1=S2n+1-S2n delta 2=S2n+1-S2n-1 sigma 0=S2n+S2n-1. are determined at time nT where S2n-1 and S2n are the Manchester code bit pair representative of the nth bit in a data stream having a bit period T. Processing of these signals permits the detection of most collisions since the Manchester coding rules are violated more than half the time in the signal formed by the colliding packets. To ensure 100% collision detection, a preamble using an intentional violation of the Manchester code in the pattern 10 11 01 10 is advantageously used in each data packet and a collision is signaled upon detection of two or more coding violations.
Inventors:
HEGAADO KURISU
Application Number:
JP50036290A
Publication Date:
December 09, 1998
Filing Date:
October 02, 1990
Export Citation:
Assignee:
KOODONOORU TEKUNOROJII CORP
International Classes:
H03M5/12; H04L12/413; H04L25/49; (IPC1-7): H04L12/40; H03M5/12
Domestic Patent References:
| JP60178752A | ||||
| JP60220640A | ||||
| JP1133443A | ||||
| JP1151337A | ||||
| JP1273461A | ||||
| JP6132634A |
Attorney, Agent or Firm:
Yusuke Hiraki (2 outside)