System Description

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SOL230 System Description v1.0 22

Chapter 4 Message Flow

Data Traffic Flow

LTE Data Traffic Flow

Sending Path

The user data received from the EPC passes through the IP network and is

transmitted to the L7MU of SOL230. The transmitted user data goes through

baseband-level digital processing (OFDMA), and transmitted to the transceiver

part. The transceiver up-converts the wideband baseband signal to the RF band,

and the converted signal is transmitted to the antenna.

Receiving Path

The RF signal received by the antenna passes through the filter and its low noise is

amplified by the LNA. This signal is converted to the data signal of baseband after

the RF down-conversion in the transceiver of the L7MU. The data which passed

through the SC-FDMA signaling process in the modem is converted to the Gigabit

Ethernet frame and transmitted to the EPC through GE.

Figure 9. SOL230 Traffic Flow (LTE)

Power Amp

Network

Main

Processor

Modem

EPC

L7MU L7MU L7MU L7MU

Conversion

Down

Conversion

D/A

A/D LNA

Filter

WiFi Data Traffic Flow

Sending Path

The signal received from the external network is transmitted to the WiFi CPU. It is

transmitted to 2.4 GHz or 5 GHz Baseband chipset based on receiver's subscriber

information. In case of 2.4 GHz sending signal, the signal goes through SAW filter

and it is amplified in power amplifier part. Then the converted signal is then

transmitted to the antenna after going through SPDT switch, 2.4 GHz LPF and

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