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Telecom Dictionary - Y

Yahoo! - A well-known portal and search engine on the web, at www.yahoo.com.

YB - see Yottabyte.

Yellow Signal - A signal that indicates the input (in a network element) has failed, sent back in the direction of the failure.

YModem - A faster version of the XModem.

YModem-G - This is YModem but with better error-correction.

Yottabyte (YB) - 2 raised to the 80th power bytes (1,208,925,819,614,600,000,000 bytes).