This signal is three short spurts in quick succession and means that the operator should pass the office name only and wait for another order tone.

此种信号是快速连续的三次简短爆发，其表示的是操作员只可以传送电话局的名称，然后等待其他的命令音。

youdao

This signal is three short spurts in quick succession and means that the operator should pass the office name only and wait for another order tone.

此种信号是快速连续的三次简短爆发，其表示的是操作员只可以传送电话局的名称，然后等待其他的命令音。

youdao