Staas & Halsey LLP
Transmission system, transmission apparatus, and clock synchronization method
A transmission system includes: a first transmission apparatus to distribute a synchronization clock; and one or more second transmission apparatuses each to connect to the first transmission apparatus so as to synchronize with the synchronization clock from the first transmission apparatus, the second transmission apparatus including: a selection portion to select the first or second transmission apparatus of a connection destination so as to switch the synchronization clock; an output portion to generate an inquiry signal addressed to the first transmission apparatus via the second transmission apparatus of the connection destination selected; a determination portion to determine whether or not the inquiry signal generated by the second transmission apparatus is received; and a second control portion to determine that there is a synchronization clock loop having a loop path through the second transmission apparatus of the connection destination when the determination portion receives the inquiry signal.
FUJITSU LIMITED
H H
H04L H04J
inventional inventional
Ryuji Nobuyuki Hiroyuki Koji Akira Takashi
Kayama Kobayashi Suzuki Suda Nozawa Nakano