EMC Connectrix B Series Hardware Reference Manual page 113

Glossary
FPGA Field-programmable gate array. An FPD that allows high logic
capacity.
Fractional Bandwidth The partial use of a link to send data back and forth, with a maximum
of 254 Class 4 connections per N_Port.
Frame The Fibre Channel structure used to transmit data between ports.
Consists of a start-of-frame delimiter, header, any optional headers,
the data payload, a cyclic redundancy check (CRC), and an end-of-
frame delimiter. There are two types of frames: link control frames
(transmission acknowledgements, etc.) and data frames.
Frame Relay A protocol that uses logical channels, as used in X.25. Provides very
little error-checking ability. Discards frames that arrive with errors.
Allows a certain level of bandwidth between two locations (known as
a committed information rate: CIR) to be guaranteed by service
provider. If CIR is exceeded for short periods (known as bursts), the
network accommodates the extra data, if spare capacity is available.
Frame relay is therefore known as bandwidth on demand.
FRU Field replaceable unit. A component that can be replaced on site.
FS Fibre Channel Service. A service that is defined by Fibre Channel
standards and exists at a well-known address. For example, the
Simple Name Server is a Fibre Channel service. See also FSP.
FSP
Fibre Channel Service Protocol. The common protocol for all fabric
services, transparent to the fabric type or topology. See also FS.
FSPF Fabric Shortest Path First. A routing protocol for Fibre Channel
switches.
FSS Fabric OS state synchronization. The FSS service is related to high
availability (HA). The primary function of FSS is to deliver state
update messages from active components to their peer standby
components. FSS determines if fabric elements are synchronized (and
thus FSS compliant).
FTP File Transfer Protocol.
FTS Fiber Transport Services.
Full Fabric The EMC software license that allows multiple E_Ports on a switch,
making it possible to create multiple ISLs.
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Connectrix B Series XPath OS AP-7420B Hardware Reference Manual