Installation Manual

User Reference and Installation Manual 2-11
CarrierWave Digital Radio MK-MAN-01
Figure 2-6 shows a functional block diagram of the CarrierWave Digital Radio, which consists of
an antenna, ODU RF Up/Down Converter with HPA and LNA, IF Processor, 64-QAM Modem,
Multiplexer/Demultiplexer, and IDU Front Panel.
Front Panel
(Display)
2 x 10BaseT
SNMP
1675 MHz
2375 MHz
Control
ODU
5.8 GHz Radio with
Integrated 23 dBi
Antenna
Radio
Control/Status
SNMP
Payload
Power (48 Vdc)
IDU/ODU
Comm Link
2375 MHz
1675 MHz
ODU Power
MUX
3.3V, 5V, 6V,-12V
2 x OC-3 2 x 100BaseT
RS232
Control
Multiplexer/Demultiplexer
Ethernet Scaler
IF Processor
64-QAM
Modem
Framer
48 V
2 x T1
Note: OC-3 only available
on SONET IDUs and
100BaseT only available
on Ethernet IDUs. Single
T1 supported on SONET
IDUs
IDU
Figure 2-6. CarrierWave System Block Diagram
The IDU interfaces with the ODU to receive and provide modulated transmit and receive
waveforms. The IDU interfaces provide SONET OC-3 (CarrierWave-155) and Fast Ethernet
100Base-T (CarrierWave-100) connections to the network. In addition, one (SONET model) or
two (Ethernet model) T1 channels are provided for PBX extension. SNMP is provided on
10/100BaseT ports.
The ODU RF Up/Down Converter card provides the interface to the antenna. The transmit
section up converts and amplifies the modulated Intermediate Frequency (IF) of 2.375 GHz from
the IF Processor and provides additional filtering. The receive section down converts the
received signal, provides additional filtering, and outputs an IF of 1.675 GHz to the IF Processor.
The 64-QAM Modem performs the modulation and demodulation of the payload (OC-3 or Fast
Ethernet or Scalable Ethernet), and forward error correction using advanced modulation and
coding techniques. Using all-digital processing, the 64-QAM Modem uses robust modulation and
forward error correction coding to minimize the number of bit errors and optimize the radio and
network performance. The 64-QAM Modem also scrambles, descrambles and