Glossary
320
HST-3000 Ethernet Testing User’s Guide
J-Proof — Application used to
verify Layer 2 Transparency.
Jumbo frame — An Ethernet
frame that exceeds the IEEE
802.3 maximum length of 1518
bytes (or 1522 bytes with a
VLAN tag), or a Fibre Channel
frame that exceeds 2140 bytes.
You can transmit jumbo frames
using the HST.
L
LED — Light emitting diode.
Link-Local Address — IPv6
address assigned to a device
locally in an IP network when
there is no other assignment
method available, such as a
DHCP server. These addresses
must always go through dupli-
cate address detection (DAD),
even if you manually specify the
address. See also DAD and
Global Addresses.
LLB — Line loopback.
LLC — Logical link control.
Three bytes carried in 802.3
frames which specify the
memory buffer the data frame is
placed in.
M
MAC Address — Media
Access Control Address.
Address assigned to every
layer 2 (Ethernet) device to
uniquely identify the device on a
LAN. Also referred to as the
“hardware” address or physical
address.
MDI port — Medium Depen-
dent Interface port. RJ-45 inter-
face used by Ethernet NICs and
routers that does not require use
of a crossover cable (MDI ports
do not cross the transmit and
receive lines). An MDI port on
one device connects to an
MDI-X port on another device.
MDI interfaces transmit using
pins 1 and 2, and receive using
pins 3 and 6. The HST-3000
supports cable diagnostics of
MDI interfaces. See also MDI-X
port.
MDI-X port — Medium Depen-
dent Interface Crossover port.
RJ-45 interface used by
Ethernet NICs and routers that
requires use of a cross-over
cable (MDI-X ports cross
transmit and receive lines. An
MDI-X port on one device
connects to an MDI port on
another device. MDI-X inter-
faces transmit using pins 3 and
6, and receive using pins 1 and
2. The HST-3000 supports cable
diagnostics of MDI-X interfaces.
MiM — MAC-in-MAC. MiM
applications allow you to
transmit and analyze unicast
layer 2 Ethernet traffic carried on
a PBB (Provider Backbone
Bridged) trunk.
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