Sony Ericsson Mobile Communications Inc. TR-505-A2 Manuale Utente

DM15/25 Integrator’s Manual

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Make sure that the AMPS/TDMA network provides the necessary telecommunication services.
Contact your service provider. Make sure that the location at which you intend to use the module is
within the network coverage.

If you intend to use SMS for the application, make sure that this is included in your (voice)
subscription.

• Noise can be caused by electronic devices and radio transmitters.

• Path-loss occurs as the strength of the received signal steadily decreases with the distance from

the transmitter.

• Shadowing is a form of environmental attenuation of radio signals that is caused by hills,

buildings, trees or even vehicles. Inside buildings this can cause problems, 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 mobile phone simultaneously.
Flat surfaces such as buildings, streets, vehicles, etc, can reflect signals.

• Hand-over occurs when you move from one cell to another in the AMPS/TDMA network. It

transfers your present mobile phone call from one cell to another. Hand-over will interfere
briefly with communication and could cause a delay, or at worst, a disruption.