Fabric OS Reference Manual

282 Fabric OS Reference Manual
BB_Credit Buffer-to-buffer credit. The number of frames that can be transmitted to a
directly connected recipient or within an arbitrated loop. Determined by
number of available receive buffers. See also Buffer-to-buffer flow control,
EE_Credit.
BER Bit Error Rate. Rate at which bits are expected to be received in error.
Expressed as ratio of error bits to total bits transmitted. See also Error.
Bit synchronization The delivery of correctly clocked bits at the required Bit Error Rate. See also
BER.
Broadcast Transmission of data from a single source to all devices in fabric, regardless
of zoning. See also Multicast, Unicast.
Buffer
-to-buffer flow
control
Management of frame transmission rate between directly connected ports or
within an arbitrated loop. See also BB_Credit.
Cascade Two or more interconnected fibre channel switches. For switches, a
maximum of seven hops is recommended (no path longer than eight
switches).
Circuit Established communication path between ports. Consists of two virtual
circuits that transmit in opposite directions. See also Link.
Class 1 A connection-oriented service that provides a dedicated connection between
two ports, with notification of delivery or non-delivery.
Class 2 A multiplex and connectionless frame switching service between two ports,
with notification of delivery or non-delivery.
Class 3 A connectionless frame switching service between two ports, without
notification of delivery or non-delivery. Can also be used to provide a
multicast connection between originator and recipients, with notification of
delivery or non-delivery.
Class F A connectionless service for control traffic between switches, with
notification of delivery or non-delivery between the E_Ports.
Class of service A set of specific delivery characteristics and attributes for frame delivery.
Comma Unique pattern (either 1100000 or 0011111) used in 8b/10b encoding to
specify character alignment within a data stream. See also K28.5.