User's Manual

36 ALFOplus 24GHz (North America) - Release 01.05.0x - MN.00395.E - 004
7.1.2 Baseband processor
The baseband Processor (BBP) carries out the following operations:
• primary and secondary power supply
• line interfaces and protections
• baseband circuits and packets processing
• I and Q signals generation and sampling
• I, Q demodulator
• Rx baseband filtering
• Actuators and measurement points for TRx unit
• FPGA debug connector
•FPGA
• Controller
BBP unit is different depending on the interface type (electrical or optical).
7.1.3 TRX Transceiver unit
TRX Transceiver consists of the following functional blocks:
• power supply dedicated to microwave circuits
• Tx baseband filtering
•I, Q modulator
• frequency synthesizer
• microwave transmitter and receiver
• IF devices on Rx side
7.1.4 Switch function
Ethernet frames forwarding is based on Mac address. Single or Vlan based Mac database can be selected
by Web Lct - Ethernet switch (Enh) - Common Parameters.
Take account the value of Max Packet Size (byte) when “802.1Q setting” is set as DISABLE or FALLBACK
the switch adds 4 Bytes for internal S_Tag. With 802.1Q setting in SECURE (that means that packet VID
must be contained in Virtual LAN table list, otherwise the packet is discarded), no internal TAGs are added.
Ethernet Speed/Duplex function
With electrical interface, in Web Lct - Baseband - Lan, Speed/Duplex can be manually or automatically
activated as half Duplex or Full Duplex 10/100/1000Base-T, while with optical interface, Speed Duplex can
be set as Full Duplex 100/1000Base-X.
Link Loss Forwarding
Link Loss Forwarding (LLF) is an alarm status of Ethernet interface that propagates on data traffic.
If LLF is enabled, any linkdown alarm will generate the alarm status of Ethernet interface blocking any
transmission to it. LLF can be enabled for each ports.