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122 GLOSSARY
clean boot
A DOS boot with no memory managers or other programs
(such as drivers) loaded in memory.
DAU
Dual access unit.
driver
A program, usually resident in the server or workstation
memory, that controls the network hardware (such as NICs
or controllers) or implements the protocol stacks through
which higher-level applications communicate with the
network hardware.
DTR
Dedicated Token Ring (DTR). An extension to the IEEE 802.5
standard that increases network performance in switched
token ring environments. It allows data transmission
using dedicated resources between the station and the
concentrator. Transmissions can be either half-duplex or
full-duplex.
DynamicAccess software
A 3Com set of features that adds intelligence to NICs to
optimize network performance and provide enhanced
network management and control.
full-duplex
A mode of operation in which a token ring station can
simultaneously transmit and receive independent data
streams. Dedicated transmissions occur between the
station and switch; token passing no longer occurs.
hexadecimal
A number system with a base of 16. In hexadecimal, the
first 10 digits are 0–9 and the last six digits are A–F. This
number system is identified in this guide by a number or
character followed by “h.”
IEEE 802.5
The standard for the token ring access method and physical
layer specifications developed by a subcommittee of the
Institute for Electrical and Electronics Engineers (IEEE) 802
committee.