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2.1.5
Modulation
The modulation technique specifies how the data is coded within the OFDM
carriers. The subscriber supports BPSK, QPSK, 16 QAM, and 64 QAM
modulation.
2.1.6
Automatic Repeat Request (ARQ)
The ARQ mechanism provides automatic retransmission of errored data and
unacknowledged data without involving higher-layer protocols. This is effective
in recovery during Fast Fade conditions.
2.1.7
Reed Solomon Error Correction
Outer Reed-Solomon and inward Convolution Coding (RS-CC) error correction is
enabled for all traffic rates, with the exception of BPSK 1/2 where only inward
Convolution Coding is used. These low-level processes can correct bursts of
errors in received messages and reduce the number of retransmissions.
2.2
Deployment Models
The subscriber supports point to point (PTP) and point to multipoint (PMP)
deployment scenarios.
2.2.1
PTP Deployment
When deployed in a PTP configuration the base station establishes a dedicated bi-
directional link to a single subscriber. The PTP deployments typically use a
directional narrow beam antenna for both ends of the link.
2.2.2
PMP Deployment
When deployed in a PMP configuration the base station establishes bi-directional
links to more than one subscriber. The PMP deployments typically use a wide
beam (sector) antenna at the base station and a narrow beam antenna at the
subscriber. Service flows are used to police service level agreements for each
subscriber.
70-00057-01-01-DRAFT
RedMAX
Figure 4: System - PTP Line of Sight Deployment
Proprietary Redline Communications © 2006
Page 15 of 60
™
Subscriber Modem
User Manual
December 13, 2006
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