User's Manual

o The band 5.15 – 5.25 GHz is for indoor use, and is not used by ARCell.
• Upper band is 5.725-5.825 GHz
o Transmitted power in the band 5.725-5.825 GHz cannot exceed 1 Watt
2
.
50 mW
Indoor
only
5.15 5.25 5.35 5.47 5.725 5.825
Frequency (GHz)
250 mW
250 mW
FCC proposal May03
1000 mW
Transmitter Power
Figure 1-4: Transmitter power limitations set by FCC.
1.4 Data Rates
The downstream data path can be configured for one of two data rates within the 6 MHz CATV
channelization:
1. 10 Mbps: QPSK modulation, 10.608 Mbps modulated data, 8 Mbps throughput
2. 20 Mbps: 16-QAM modulation, 20.216 Mbps modulated data, 17 Mbps throughput.
The Downstream data is received by all the subscribers’ modems, and each modem selects the
packets addressed to it.
The Upstream path is “5 Mbps” in a 3.2 MHz channel: QPSK modulation, 5.12 Mbps modulated
data, 5 Mbps throughput.
Each modem’s transmission upstream is controlled by the W-CMTS, which assigns it a time slot
in which to transmit the RF signal containing the packet data.
2
In May 2003 the FCC issued a Notice of Proposed Rule Making (NPRM) to enhance the 5 GHz band.
Arcwave is following that NPRM activity and will enhance products as the Rules are finalized.
June 2003 Page 1-7