System Description

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Chapter 3 SOL230 Structure
SOL230 System Description v1.0 19
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Clock Generation Function
The SOL230 supports IEEE1588v2. The clock block allows each block of
SmallCell to be operated with synchronized clock system.
The IEEE1588v2 block generates system clock by using the data, which is
received from external IEEE1588v2 master. It also performs holdover function
that provides normal clock for a specific time period if not receiving IEEE1588v2
packet.
Network Interface Function
The L7MU interfaces with EPC via Gigabit Ethernet. (Optic)
Subscriber Channel Processing Function
The L7MU has the modem that supports LTE standard physical layer. It also, it
performs OFDMA/SC-FDMA channel processing and DSP processes RLC/MAC.
The modem modulates the packet data received from the upper processor layer and
transmits it to the transceiver.
Conversely, it demodulates the data received from the transceiver and, converts the
data into the type defined, for example, as indicated in the specification of physical
layer in LTE standard, to transmit the data to upper processor.
2Tx/2Rx MIMO Support
The RF part of L7MU consists of a transceiver and an amplifier. It supports the
2Tx/2Rx RF path. The maximum output is 500 mW/path.
DAC/ADC Function
In downlink path, a baseband signal is converted into an analog signal through the
Digital-to-Analog Converter (DAC). The frequency of those analog signals is up-
converted through the modulator. Then, the signals are amplified into high-power
RF signals through the power amplifier.
In uplink path, a RF signal is amplified in LNA with low noise and it is down-
converted in frequency through the demodulator. These down-converted frequency
signals are converted into baseband signals through the Analog-to-Digital
Converter (ADC). Then, the converted baseband signal is transmitted to the
modem.
Wi-Fi Channel Support
The Wi-Fi-standard physical level is supported. The wireless network environment
is created by providing WLAN 802.11 a/b/g/n/ac feature. Also, 2.4 GHz and 5
GHz dual bands can be serviced simultaneously via a wireless interface.
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