May 2009
Intermediate to advanced
882 pages
22h 55m
English
Content preview from Cisco® Network Professional's: Advanced Internetworking Guide
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O
- OC
Optical Carrier: A series of physical protocols, designated as OC-1, OC-2, OC-3, and so on, for SONET optical signal transmissions. OC signal levels place STS frames on a multimode fiber-optic line at various speeds, of which 51.84 Mbps is the lowest (OC-1). Each subsequent protocol runs at a speed divisible by 51.84. See also: SONET.
- octet
Base-8 numbering system used to identify a section of a dotted decimal IP address. Also referred to as a byte.
- ones density
Also known as pulse density, this is a method of signal clocking. The CSU/DSU retrieves the clocking information from data that passes through it. For this scheme to work, the data needs to be encoded to contain at least one binary 1 for each 8 bits transmitted. See also: CSU ...
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