User's Manual Part 1
Table Of Contents
- Cambium PTP 650 Series User Guide
- Contacting Cambium Networks
- Purpose
- Cross references
- Feedback
- Chapter 1: Product description
- Chapter 2: System hardware
- Chapter 3: System planning
- Chapter 4: Legal and regulatory information
- Cambium Networks end user license agreement
- Acceptance of this agreement
- Definitions
- Grant of license
- Conditions of use
- Title and restrictions
- Confidentiality
- Right to use Cambium’s name
- Transfer
- Updates
- Maintenance
- Disclaimer
- Limitation of liability
- U.S. government
- Term of license
- Governing law
- Assignment
- Survival of provisions
- Entire agreement
- Third party software
- Compliance with safety standards
- Compliance with radio regulations
- Cambium Networks end user license agreement
Chapter 1: Product description Wireless operation
Wireless operation
This section describes how the PTP 650 wireless link is operated, including modulation modes,
power control and security.
Time division duplexing
TDD cycle
PTP 650 links operate using Time Division Duplexing (TDD). They use a TDD cycle in which the
ODUs alternately transmit and receive TDD bursts. The TDD cycle is illustrated in Figure 2. The
steps in the cycle are as follows:
1
The TDD m
aster transmits a burst to the TDD slave.
2
A delay occurs as the
master-slave burst propagates over the link.
3
The s
lave receives the burst from the master.
4
T
he slave processes the master-slave burst.
5
The slave transmits a burst to the
master.
6
A delay occurs as the
slave-master burst propagates over the link.
7
The m
aster receives the burst from the slave.
8
The m
aster transmits the next burst to the slave.
TDD frame parameters
The TDD burst duration varies depending on the following:
• Channel bandwidth
• Link range
• Link optimization mode
• Link symmetry
• Offered traffic loading.
The TDD frame duration varies depending on the following:
• TDD burst duration master-slave.
• TDD burst duration slave-master.
• Link range.
Page
1-6