EXFO ETS-1000G - Manual (Page 186)

Glossary
176 ETS-1000G
MAC address
Media Access Control address. A unique identifier that is used for
addressing network devices on the physical layer. A 48-bit MAC address is
used in Ethernet.
MPLS
Multi-Protocol Label Switching. An IP datagram transfer technology that is
used in high-speed switching devices.
NUT
Network Under Test. The network being tested.
OAM
Operations, Administration, and Maintenance. A link state monitoring
protocol.
OSI
Open Systems Interconnection Reference Model. The seven-layer
hierarchical model for network communications and network protocol
interaction that was developed by the International Organization for
Standardization (ISO). The model's layers are placed vertically above each
other. Each layer interacts with the neighboring ones and implements
certain functions.
RJ
Registered Jack. A standardized physical interface that is used for
interconnecting telecommunications equipment.
RJ-45
A connector that complies with the Registered Jack standard and is used
for connecting twisted pairs in Ethernet networks.
Runt frame
A data packet that doesn't exceed 64 bytes with a correct frame-check
sequence.