User's Manual
Table Of Contents
- 1 Preface
- 2 Overview
- 3 Features
- 3.1 Main Features
- 3.2 Adaptive Coding and Modulation (ACM)
- 3.3 Transmit Power Control (TPC)
- 3.4 2x2 Multiple-input and Multiple-output (2x2 MIMO)
- 3.5 Dynamic Frequency Selection (DFS)
- 3.6 Dynamic Channel Selection (DCS)
- 3.7 Retransmission
- 3.8 Configurable Uplink/Downlink Ratio
- 3.9 Quality of Service (QoS)
- 3.10 Power over Ethernet
- 3.11 Synchronization
- 3.12 Co-site Synchronization
- 3.13 OFDM Modulation
- 3.14 Low-density Parity Check (LDPC) Encoding
- 3.15 LLDP
- 3.16 Radio Port Performance Monitoring
- 3.17 Adaptive Noise Immunity (ANI)
- 4 Mechanical Structure and Interfaces
- 5 Product Structure
- 6 Management
- 7 Technical Specification
- 8 Standards
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DragonWave Inc.Features
3.12 Co-site Synchronization
To better reuse the frequency and reduce the interference of co-site implementation, co-
site synchronization is implemented.
When two collocated Lites who use the same frequency or frequency close to each other
are not synchronized and one of them is in transmitting status and another one is receiv-
ing status, the receiving Lite will receive the remote site signal plus the transmitting Lite’s
interference signal, which results in packet loss or even link breakdown.
Figure 12 Co-site Synchronization Realization
Co-site synchronization is used to control all links connected to the same node to
transmit and receive at the same time, thus transmitting over receiving interference can
be avoided. Site synchronization is achieved through in-band protocol on GE interfaces
without any need for GPS signal and/or dedicated distribution.
A 1588-like mechanism is employed to synchronize the transmission trigger. One Lite
at the hub site is assigned the role of master and the rest co-site Lites are assigned
slave. The 1588-like protocol synchronizes the transmitting and receiving time and
interval so the Lite in the same site can switch to transmit or to receive at the same time
to avoid any site receiving the signal from the collocated Lite.
When the co-site synchronization is enabled, the Tx/Rx cycle will be aligned so the local
Tx will not interfere with the collocated Rx.