Modem User Manual

MTX-H15 UMTS-HSDPA terminal modem http://www.matrix.es
MTX-H15 User Manual V.2.0 Pag. 25
Preliminary. Subject to change without prior notice
7.3.5 Possible communications disturbances
Possible communication disturbances include the following:
• Noise can be caused by electronic devices and radio transmitters.
• Path-loss occurs as the strength of the received signal steadily decreases in proportion to the distance
from the transmitter.
• Shadowing is a form of environmental attenuation of radio signals caused by hills, buildings, trees or
even vehicles. This can be a particular problem inside buildings, especially if the walls are thick and
reinforced.
• Multi-path fading is a sudden decrease or increase in the signal strength. This is the result of
interference caused when direct and reflected signals reach the antenna simultaneously. Surfaces such as
buildings, streets, vehicles, etc., can reflect signals.
• Hand-over occurs as you move from one cell to another in the GSM network. Your mobile application
call is transferred from one cell to the next. Hand-over can briefly interfere with communication and may
cause a delay, or at worst, a disruption.