User Manual

Version 3.03 SPEEDLAN 9000 Series Installation and Operation User Guide
Glossary-12
Loss of Signal (LOS)
The signal from the user’s device does not appear in the DSX or E1 interface. (This is not to be confused with
Line of Sight.)
MAC address
In a LAN environment each computer contains its own Medium Access Control (MAC) address which is the
embedded and unique hardware number. For computers on Ethernet LANs, this is the same number as its
Ethernet address. This address is controlled at the DataLink Layer of the OSI model, and is in a hexadecimal
format separated by four octets (i.e., 82.39.1E.38).
MAN
This is a metropolitan network that enables computers, network equipment, other peripherals, and more than
one LAN to communicate within the city or nearby limits.
Management Information Base (MIB)
A database of network parameters used by SNMP and CMIP to monitor and change network device settings.
It provides a logical naming of all information resources on the network pertinent to the network’s
management.
Mean Time Between Failure (MTBF)
A measure of the theoretical times a component or device will operate without failing.
MHz (MegaHertz)
Millions of Hertz.
Modulation
The process of varying characteristics of a carrier signal to represent changes in the transmitted information.
MOdulator-DEModulator (MODEM)
A device that converts a digital signal to analog, or vice versa, and is used to transfer data between
computers over communications lines.
Mb/s
Million of samples per second.