Nortel BayStack 650 User Manual page 23

Figure 1-1.
The physical layer is a 2.4 GHz spread spectrum, frequency hopping radio that
replaces the Ethernet cable normally required between LAN workstations.
Figure 1-2
Telecommunications
Television
FM Broadcast
(88 to 108 MHz)
Short Wave Radio
AM Broadcast
(560-1605 KHz)
Audio Frequencies
Figure 1-2.
203282-B
Application
Presentation
Session
Transport
Network
Data Link
Physical
BayStack 650 Wireless LAN Technology
and the OSI Reference Model
illustrates the frequency spectrum for this radio technology.
Super
High
Ultra
High
Very
High
High
Medium
Low
Very
Low
Frequency Hopping Radio Technology
LLC Layer - IEEE 802.2
MAC Layer - IEEE 802.11
Carrier Sense Multiple Access (CSMA)
Virtual Collision Detection (VCD)
Asynchronous Service
Error Correction, Access Control, Roaming...
PHY Layer - Radio-IEEE 802.11
2.4 GHz
Direct Sequence Spread Spectrum
1 Mbps
100-500 Meter Transmission Range
5.850 GHz
Broadband
5.725 GHz
2.4835 GHz
802.11
2.400 GHz
928 MHz
Cellular
902 MHz
8698EB
Introduction
8699EC
1-3