Data Circuit and Data Service Unit (DSU) are provided and maintained by CHT while the customer Premises Equipment (CPE) is provided and maintained by the customer.
2
实时时钟电路（X1228）被用作里程表，数据存储器和车速表中的警报。
A real-time clock circuit(X1228)is applied to be an hourmeter, data memorizer and alarm in speedometer.
The problem is that the transistors used to make logic circuits hold their electronic state, and therefore any data they contain, only when powered up.
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