Glossary
318
HST-3000 Ethernet Testing User’s Guide
measuring round trip delay and
counting out-of-sequence
frames.
B
Base Unit — The HST-3000
base unit houses the keypad,
display screen, battery, and
some connectors. Service inter-
face modules (SIMs) connect to
the base unit to provide testing
functionality.
BERT — Bit Error Rate Test. A
known pattern of bits is trans-
mitted, and errors received are
counted to figure the BER. The
Bit Error Rate test is used to
measure transmission quality.
C
CJPAT — Continuous jitter test
pattern.
CRC — Cyclic redundancy
check. See also FCS.
CRPAT — Continuous random
test pattern.
CSPAT — Compliant supply
noise test pattern.
CVLAN — Customer VLAN.
Used in Q-in-Q traffic to partition
traffic for a particular customer
(as opposed to the traffic for the
service provider).
D
DAD — IPv6 duplicate address
detection. When going through
the Multicast Listener Discovery
process to obtain or verify a link
local address, a device issues a
neighbor solicitation using the
tentative address to determine if
the address is already used.
This process is referred to as
DAD.
DHCP — Dynamic Host Config-
uration Protocol. A communica-
tions protocol that assigns IP
addresses dynamically as
needed. Also supports static IP
address assignment.
DIX — Digital, Intel, and Xerox.
Ethernet Type II frame format.
E
EDD — Ethernet demarcation
device.
EFM — Ethernet first mile.
Ethernet link partner — The
nearest Ethernet device on a
link. The HST auto-negotiates
its capabilities with this device
when you initialize a link.
F
FCS — Frame check sequence.
A value calculated by an origi-
nating device and inserted into
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