Ethernet solutions

Modems designed to support Fast Ethernet or Gigabit Ethernet for IP traffic with capacity varying from 100 Mbps to 820 Mbps. From Q2 2011, we expect to have commercially available dual polarized Ethernet radio modem solution for microwave applications on low cost FPGA, which would carry over 1 Gbps of traffic. 

The Modesat 1024QAM IP Core data Rx and Tx interfaces can be configured to work in bridging 10/100/1000Mbps Ethernet mode. When configured in Ethernet mode the 10/100/1000 Ethernet MAC functionality will be included in the same FPGA device with modem IP core. The Ethernet interface complies with the IEEE 802.3 standard supporting pause frame based flow control.

A modem pair, when equiped with Ethernet interfces, works on Data Link Layer (Layer 2) in bridge mode – all incoming packets are forwarded to radio link partner and vice versa. The Ethernet MAC allows the user data interface to work in a packetized payload mode while the radio link is working in a streaming mode.

The Ethernet subsystem in Modesat QAM modem can be enhanced with QoS filters and queue management as well as with data compression for throughput improvement.

The typical configuration of Modesat Ethernet based modem:

• Modulation: QPSK to 1024QAM
• Transport stream is 10/100/1000 BASE-T Ethernet
• I/Q baseband, complex IF or real IF interface
• Input and output carrier frequencies are freely software configurable
• Adaptive Coding and Modulation
• Quality of Service support
• Low latency
• Roll-Off factor: software configurable 16-25%
• Bandwidth: software configurable 5 to 112MHz*
• Symbol rate: software configurable 4.5-104 MSym/s
• Includes PilotSync™ technology
• FEC Reed-Solomon encoder/decoder, LDPC optionally for Altera hardcopy
• Interleaver/Deinterleaver depth: I = 1/2/3/4/6/12/17
• XPIC with dual polarized modem in single low cost FPGA**
• Configuration via 8bit parallel host interface or RS 232
• Single external analogue loop for AGC 18 bits
• Input from ADC: 11-12 bits (1 or 2 (I/Q) channels)
• Output to DAC: 10-16 bits (1 or 2 (I/Q) channels)
• Decision Feed-Forward Equalizer in the receiver channel
• Modem master clock / sampling rate: single, fixed 200 or 210MHz XO clock source
• Shape Filter: Root-Raised-Cosine
• Internal PRBS generator and internal BER tester

* 5-56 MHz channel spacing for 1024QAM supported
** will be available in Q2 2011