| 摘要 |
<p>PURPOSE:To avoid waste of operation and to improve the line efficiency by allowing a monitor means to monitor a free information channel when all information channels are busy and allowing a call means to make a call when a free channel is found out. CONSTITUTION:When a few lines are used by plural terminal sets and all information channels are busy, a monitor means is provided to monitor a free information channel and a call means is provided to make a call when the monitor means finds out a free channel. Then the operating state of channels is monitored and redialing is applied automatically at a point of time when a channel is free. Thus, the operator's load is relieved and the line efficiency is improved.</p> |
