一种电话信令方式,信令所需电力由交换机处的中央电池提供。
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一种电话信令方式,信令所需电力由交换机处的中央电池提供。
A telephony signalling method in which the electrical power for the signal is supplied from a central battery at the exchange.
Common battery signalling was widely used in early automatic telephone exchanges.
共电式信令广泛用于早期的自动电话交换机。
一种电话信令方式,信令所需电力由交换机处的中央电池提供。
A telephony signalling method in which the electrical power for the signal is supplied from a central battery at the exchange.
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