Cisco ONS 15454 SDH Specifications Page 471

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Glossary
GL-9
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
F
Falling threshold
A falling threshold is the counterpart to a rising threshold. When the number of occurrences drops below a falling threshold,
this triggers an event to reset the rising threshold. See also rising threshold.
FC
Failure count.
FDDI
(Fiber Distributed Data Interface). LAN standard, defined by ANSI X3T9.5, specifying a 100-Mbps token-passing network
using fiber optic cable, with transmission distances of up to 2 km. FDDI uses a dual-ring architecture to provide redundancy.
FE
Frame Bit Errors.
FG1
Frame Ground #1 (pins are labeled FG1, FG2, etc.)
FMEC
Front Mount Electrical Connection.
Frame
Logical grouping of information sent as a data link layer unit over a transmission medium. Often refers to the header and trailer,
used for synchronization and error control that surrounds the user data contained in the unit.
FSB
Field Service Bulletin.
G
Gateway
An electronic repeater device that intercepts and steers electrical signals from one network to another.
GBIC
(Gigabit Interface Converter). A hot-swappable input/output device that plugs into a Gigabit Ethernet port to link the port with
the fiber optic network.
Gbps
Gigabits per second.
GBps
Gigabytes per second.
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