User's Manual
Table Of Contents
- 1.Safety Precautions
- 2.System Description
- 2.1About This Manual
- 2.2Introduction
- 2.3System Features
- 2.4Physical Description
- 2.5System Description
- 2.6Consecutive Point Architecture
- 2.72 + 0 (East-West) Configuration
- 2.8Spanning Tree Protocol (STP)
- 2.91+1 Protection
- 2.101 + 1 Multi-hop Repeater Configuration
- 2.11Data Interfaces
- 2.12Crosspoint Switch
- 2.13Power Management
- 2.14Event-HD Software and Network Management
- 2.15System Loopbacks
- 3.Installation
- 3.1Unpacking
- 3.2Notices
- 3.3PRE-INSTALLATION NOTES
- 3.4Back-to-Back Bench Testing
- 3.5Overview of Installation and Testing Process
- 3.6Site Evaluation
- 3.7Installation of the Event-HD
- 3.8Quick Start Guide
- 3.9SDIDU™ Service
- 4.Summary Specification
- 5.Rear Panel Connectors
- 5.1DC Input (Power) Connector
- 5.2Ethernet 100BaseTX Payload Connector 1-2
- 5.3SONET Payload Connector
- 5.4STM-1 Payload Connector
- 5.5DVB/ASI, DS-3, E-3, STS-1 Payload Connector
- 5.6NMS 10/100BaseTX Connector 1-2
- 5.7Alarm/Serial Port Connector
- 5.8ODU Connector
- 5.9T1/E1 - Channels 1-2 Connector
- 5.10T1/E1 - Channels 3-16 Connector
- 5.11USB
- 5.12Voice Order Wire
- 5.13Data Order Wire
- 6.Appendix
2. System Description 23
mode does not require the extra bandwidth or interference protection. It provides hitless
receive switching and hot standby. The SDIDU
TM
automatically switches transmit ODU
upon appropriate ODU alarm or ODU interface error, minimizing transmit outage time.
Connected to
west modem
Connected to
east modem
Connected to
west modem
Connected to
east modem
Figure 2-9. 1+1 Protection in Non-Diversity Mode
2.9.2Protected Diversity
In Protected Diversity mode, the link between each pair of modems is the same, as
shown in Figure 2-10, providing complete redundancy. This arrangement requires
bandwidth for both links and non-interference between the links, but it provides hitless
receive and transmit switching. The SDIDU
TM
supports both frequency and spatial
diversity.
Connected to
east modem
Connected to
west modem
Connected to
west modem
Connected to
east modem
Figure 2-10. 1+1 Protection in Diversity Mode
2.9.2.1 Frequency Diversity
In frequency diversity, two frequencies are used to achieve non-interference. The
proprietary framer chooses the best, or error-free, data stream and forwards it to the
Line Interface Units (LIUs).
© 2007 Moseley, Inc. All Rights Reserved. 602-14886-01, Rev. A