Brocade Communications Systems SilkWorm 3800, Справочник по аппаратуре, Страница: 48 / 62

Glossary-2 SilkWorm 3800 Hardware Reference
beacon
When all the port LEDs on a switch are set to flash from one side of the switch to
the other, to enable identification of an individual switch in a large fabric. A
switch can be set to beacon by telnet command or through Brocade Web Tools.
beginning
running
disparity
The disparity at the transmitter or receiver when the special character associated
with an ordered set is encoded or decoded. See also disparity.
BER Bit error rate. The rate at which bits are expected to be received in error.
Expressed as the ratio of error bits to total bits transmitted. See also error.
block As applies to fibre channel, upper-level application data that is transferred in a
single sequence.
boot code Software that initializes the system environment during the early phase of the
boot up process. For example, boot code may determine the amount of available
memory and how to access it.
boot flash
Flash (temporary) memory that
stores the boot code and boot parameters.
broadcast The transmission of data from a single source to all devices in the fabric,
regardless of zoning. See also multicast, unicast.
buffer
-
to
-
buffer
flow control
Management of the frame transmission rate in either a point-to-point topology or
in an arbitrated loop. See also BB_Credit.
cascade Two or more interconnected fibre channel switches. SilkWorm 2000 and later
switches can be cascaded up to 239 switches, with a recommended maximum of
seven interswitch links (no path longer than eight switches). See also fabric, ISL.
chassis The metal frame in which the switch and switch components are mounted.
circuit An established communication path between two ports. Consists of two virtual
circuits capable of transmitting in opposite directions. See also link.
Class 1 The class of frame switching service for a dedicated connection between two
communicating ports (also called connection-oriented service), with
acknowledgement of delivery or nondelivery of frames.
Class 2 A connectionless class of frame switching service that includes acknowledgement
of delivery or nondelivery of frames.
Class 3 A connectionless class of frame switching service that does not include
acknowledgement of delivery or nondelivery of frames. Can be used to provide a
multicast connection between the frame originator and recipients, with
acknowledgement of delivery or nondelivery of frames.
Class F The class of frame switching service for a direct connection between two
switches, allowing communication of control traffic between the E_Ports, with
notification of delivery or nondelivery of data.
class of service A specified set of delivery characteristics and attributes for frame delivery.
CLI Command line interface. Interface that depends entirely on the use of commands,
such as through telnet or SNMP, and does not involve a GUI.
comma A unique pattern (either 1100000 or 0011111) used in 8B/10B encoding to specify
character alignment within a data stream. See also K28.5.