To provide a time signal supply system that can easily cope with new installation of an exchange and replacement of an old exchange with a new model exchange at a low cost and supply a time signal with high accuracy without the need for troublesome maintenance management.
Slave time units 4 each having a self-running built-in clock corresponds to one master time unit 3 having a self-running built-in clock, the master time unit 3 acquires the Japan Standard Time to correct a time of its built-in clock, the built-in clock whose time is corrected periodically distributes time information to the slave time units 4 via a telephone network 5 according to a predetermined schedule, each of the slave time units 4 corrects the time of its built-in clock on the basis of the received time information, and the built-in clock of each of the slave time units 4 whose time is corrected supplies the time signal to any prescribed number of exchanges 6 to which each of the slave time units 4 is connected in advance.
KOMATSU KATSUYUKI
NAKATANI TAKAYOSHI
TAKAHASHI KENJI
NEGISHI MITSUGI
KURAMOCHI RIICHI
SHIBATA HITOSHI
YAMAZAKI HIDEAKI
NOZAWA MINORU
YAMAGISHI HIROO
KUSAKABE TAKAYUKI
NISHINA TAKEYOSHI
TACHIBANA TSUTOMU
NIPPON TELEGRAPH & TELEPHONE
TAIKO ELECTRIC WORKS LTD