Glossary - 4
FORE Systems ES-2810 Ethernet Switch User's Manual
Glossary
atmarp - a FORE program that shows and manipulates ATM ARP entries maintained by the
given device driver. This is also used to establish PVC connections.
ATM-attached Host Functional Group (AHFG) - The group of functions performed by an ATM-
attached host that is participating in the MPOA service.
atmconfig - a FORE program used to enable or disable SPANS signaling.
atmstat - a FORE program that shows statistics gathered about a given adapter card by the
device driver. These statistics include ATM layer and ATM adaptation layer cell and error
counts. This can also be used to query other hosts via SNMP.
Attachment User Interface (AUI) - IEEE 802.3 interface between a media attachment unit (MAU)
and a network interface card (NIC). The term AUI can also refer to the rear panel port to
which an AUI cable might attach.
Auto-logout - a feature that automatically logs out a user if there has been no user interface
activity for a specified length of time.
Automatic Protection Switching (APS) - Equipment installed in communications systems to
detect circuit failures and automatically switch to redundant, standby equipment.
Available Bit Rate (ABR) - a type of traffic for which the ATM network attempts to meet that
traffic's bandwidth requirements. It does not guarantee a specific amount of bandwidth and
the end station must retransmit any information that did not reach the far end.
Backbone - the main connectivity device of a distributed system. All systems that have con-
nectivity to the backbone connect to each other, but systems can set up private arrangements
with each other to bypass the backbone to improve cost, performance, or security.
Backplane - High-speed communications line to which individual components are connected.
Backward Explicit Congestion Notification (BECN) - A Resource Management cell type gener-
ated by the network or the destination, indicating congestion or approaching congestion for
traffic flowing in the direction opposite that of the BECN cell.
Bandwidth - usually identifies the capacity or amount of data that can be sent through a given
circuit; may be user-specified in a PVC.
Baud - unit of signalling speed, equal to the number of discrete conditions or signal events per
second. If each signal event represents only one bit, the baud rate is the same as bps; if each
signal event represents more than one bit (such as a dibit), the baud rate is smaller than bps.
Bayonet-Neill-Concelman (BNC) - a bayonet-locking connector used to terminate coaxial cables.
BNC is also referred to as Bayonet Network Connector.
Bipolar 8 Zero Substitution (B8ZS) - a technique used to satisfy the ones density requirements
of digital T-carrier facilities in the public network while allowing 64 Kbps clear channel data.
Strings of eight consecutive zeroes are replaced by an eight-bit code representing two inten-
tional bipolar pulse code violations (000V10V1).
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