![Cambium Networks PMP 450 AP Скачать руководство пользователя страница 40](http://html1.mh-extra.com/html/cambium-networks/pmp-450-ap/pmp-450-ap_planning-and-installation-manual_3055234040.webp)
Chapter 1: Product description
Wireless operation
Page
1-15
Wireless operation
This section describes how the 450 Platform Family wireless link is operated, including modulation
modes, power control and security.
Time division duplexing
The system uses Time Division Duplexing (TDD) – one channel alternately transmits and receives rather
than using one channel for transmitting and a second channel for receiving. The radio link operates on a
single frequency channel in each direction using TDD. The AP operates in TDMA mode to service
multiple SMs. To accomplish TDD, the AP/BHM must provide sync to its SM/BHS. Furthermore,
collocated APs/BHMs must be synced together – an unsynchronized AP/BHM that transmits during the
receive cycle of a collocated AP/BHM can prevent a second AP/BHM from being able to decode the
signals from its APs/BHSs. In addition, across a geographical area, APs/BHMs that can “hear” each other
benefit from using a common sync to further reduce self-interference within the network.
Modules use TDD on a common frequency to divide frames for uplink (orange) and downlink (green)
usage, as shown in the figure below.
For more information on synchronization configuration options, see
Figure 2 TDD frame division
Time
Содержание PMP 450 AP
Страница 79: ...Chapter 2 System hardware System Components Page 2 29 Figure 20 Gigabit Enet Capable power supply...
Страница 160: ...Chapter 3 System planning Radio Frequency planning Page 3 30 Figure 55 Sector Antenna...
Страница 161: ...Chapter 3 System planning Radio Frequency planning Page 3 31 Figure 56 cnMedusa Antenna...
Страница 189: ...Chapter 3 System planning Remote AP Deployment Page 3 59 Figure 65 Remote AP wired to SM that serves as a relay...