A second in which the E1/T1 link is unavailable, as defined by a second after which 10 contiguous SES (severely errored seconds) have occurred. The DS1 interface only becomes available after 10 contiguous seconds without any SESs.
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User Datagram Protocol (UDP)
A protocol used for computers to send messages. With UDP, In IP network, there is no need to set up special channels before data communication.
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Underwriters Laboratories (UL)
Independent product safety laboratory near Chicago, Illinois in the United States. Issues product certifications that assure safety.
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