Demarcation point

（重定向自DEMARC）

20th century Bell Canada demarcation point for a single phone line. The spark-gap surge protectors on the left have hex heads for easy removal. Near center, a post is connected to the house's ground. The other two connection points are for tip and ring. A test jack can be attached nearby so the home-owner or tenant can verify whether the inside wiring is at fault. Modern Bell Canada demarcation points are network interface devices

In telephony, the demarcation point is the point at which the public switched telephone network ends and connects with the customer's on-premises wiring. It is the dividing line which determines who is responsible for installation and maintenance of wiring and equipment—customer/subscriber, or telephone company/provider. The demarcation point varies between countries and has changed over time.

单词	DEMARC
释义	DEMARC 英语百科 Demarcation point （重定向自DEMARC） In telephony, the demarcation point is the point at which the public switched telephone network ends and connects with the customer's on-premises wiring. It is the dividing line which determines who is responsible for installation and maintenance of wiring and equipment—customer/subscriber, or telephone company/provider. The demarcation point varies between countries and has changed over time.
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