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.
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.
Underwriters Laboratories (UL)
Independent product safety laboratory near Chicago, Illinois in the United States. Issues product certifications that assure safety.
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