Satel SATELLINE-EASy Guía de usuario descargar pdf (Pagina 25)

SATELLINE-EASy Pro

User Guide v.1.5

7.2 Receiver

The sensitivity of the receiver depends on the channel spacing of the radio modem (=data speed

of the radio interface) and on the mode of the FEC (error correction) according to the table

below:

Channel

spacing

FEC OFF

FEC ON

25 kHz

-108 dBm

-111 dBm

20 kHz

-111 dBm

-114 dBm

12.5 kHz

-111 dBm

-114 dBm

The Signal Threshold Level setting of the receiver determines a level, above which the search for

the actual data transfer signal is active. It is recommended that values given in the table are used.

If the Signal Threshold Level setting is set too low (the CD-LED is ON constantly), it is possible that

the receiver is trying to synchronise itself with noise, in which case, the actual data transmission

might remain unnoticed. Alternatively, weak data transmissions will be rejected, even though they

would be otherwise acceptable.

7.3 Priority RX/TX

SATELLINE-EASy Pro offers a Priority setting, which selects the priority between reception and

transmission. The setting can be changed in Programming Mode. By default, transmission has

higher priority than reception i.e. the default value is Priority TX.

Priority TX means that a terminal device attached to a radio modem decides the timing of the

transmission. The transmitter is immediately switched on when the terminal device starts to output

data. Should reception be in progress, the radio modem will stop it and change to a transmit

state. There is no need to use any handshaking for the control of timing.

Priority RX means that a radio modem tries to receive all data currently in the air. If a terminal

outputs data to be transmitted (or an SL command) it will buffered. The radio modem will wait

until the reception has stopped before transmitting the buffered data. This will result in timing

slacks to the system, but decreases the number of collisions on the air; this is particularly useful in

systems based on multiple random accesses.

To toggle the Priority setting in the programming menu, select:

1) Priority RX / TX

If the Repeater Function has been set on, priority setting is automatically switched to RX mode.

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Satel SATELLINE-EASy Guía de usuario Pagina 25