EXFO ETS-1000G User Manual
Page 184
Glossary
174
ETS-1000G
DNS
Domain Name System. A distributed system (a database) that is used for
translating a network device name into an IP address. DNS operates in the
TCP/IP networks.
DSCP
Differentiated Services Code Point. A field in the IP packet header that
consists of 8 bits. It allows classifying more traffic types than the Precedence
and ToS fields.
DUT
Device Under Test. The device being tested.
ECN
Explicit Congestion Notification. Setting bits in this field allows routers to
detect the congestion on the data transmission path to the specified
network node without discarding a packet.
EF
Expedited Forwarding. It is used for processing the deference-sensitive
traffic that requires the minimum jitter, such as video or voice (VoIP; Voice
over IP).
Ethernet
Local networking technology. It is defined in the IEEE standards, group
802.3.
Frame loss rate
A test that determines the percentage of frames that a network element
has failed to transmit in case of steady load due to the shortage of
hardware resources.
FTP
File Transfer Protocol. A protocol that supports le transmission in computer
networks.