User's Manual

February 2003
Rev. A
Page 8 of 47
order to divide the bandwidth periodically, based on FRAME SIZE. The portion of the frame, which
is allocated to the upstream traffic between the SUs, is TDMA (Time Division Multiplex Access)
time domain technique.
It is controlled dynamically and allows a very efficient way of channel capacity utilization. A small
portion of the capacity is allocated for new SU registration. The registration slot is allocated to the
SU based on slotted aloha algorithm.
Figure 1-2: GigAccess™ Outdoor Unit
The GigAccess
TM
MAC layer is based on IEEE 802.16 MAC standard with additional proprietary
attributes, which allow some special features such as Consecutive AP
TM
.
GigAccess
TM
networking enables routing and QoS (Quality of Service) queuing of traffic, based
on classification of packets information in layer 2, 3 & 4. In certain instances QoS queuing can be
done using packet information (priority defined by the management).
Operating in the unlicensed 2.4 GHz frequency band, GigAccess
TM
2.4 leverages Direct
Sequence Spread Spectrum (DSSS) technology to deliver high data rates, high spectral efficiency
in addition to immunity to interference and line of site boundaries via patent pending consecutive-
AP™ technology. GigAccess
TM
2.4 ensures always-on connectivity to full range of IP-based
services, including fast Internet streaming video and VOIP. GigAccess
TM
2.4 provides an
independent infrastructure, which is easy to deploy with very low operating costs.