【摘 要】
：
目前许多按键电话机都设有长途锁装置,用户使用专门的钥匙可将话机锁上或开锁,以限制或不限制拨打长途电话。由于长途电话的首位都为“0”码,故长途锁控电路实质上就是锁住
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目前许多按键电话机都设有长途锁装置,用户使用专门的钥匙可将话机锁上或开锁,以限制或不限制拨打长途电话。由于长途电话的首位都为“0”码,故长途锁控电路实质上就是锁住首位拨“0”号码的电路。要求话机锁上后,若摘机首拨“0”,则号码不能发出且“0”码后面所拨的号码全锁;若摘机后所拨的第一个号
At present, many key phones have a long-distance lock device, the user can use a special key to lock or unlock the phone to limit or not limit long-distance calls. As the first long-distance phone are “0” code, so long-distance lock control circuit is essentially lock the first dial “0” number of the circuit. After the phone is locked, if the first dial of “0” is off-hook, the number can not be sent out and the number dialed after “0” code is fully locked; if the first number dialed after off-hook
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