Moseley Associates Inc EVENTHD ユーザーズマニュアル

carrier. The multiplexer function is built into an appliqué that resides in the Modem/IF 
Module. Two modems can be used for 1+1 protection or ring architectures. 

•  Power Supply – The Event-HD power supply accepts 48 Vdc and supplies the SDIDU

TM

 

and ODU with power. A second redundant power supply may be added as an optional 

module. 

The Modem Processor and its associated RAM, ROM, and peripherals control the digital 

and analog operation. It also provides configuration and control for both the IF and I/O 
cards. The SDIDU interfaces with the ODU to receive and provide modulated transmit 

and receive waveforms.  

The Event-HD digital radio also provides the physical interface for the user payload and 
network management. In transmit mode, the Framer merges user payload (OC-3 or Fast 

Ethernet) with radio overhead-encapsulated network management data. This combined 
data stream is transmitted without any loss of user bandwidth. In the receive mode, the 

Framer separates the combined data stream received from the 256-QAM Modem. The 
SDIDU

 supports Scalable Ethernet data rates, such as 25 or 50 Mbps via the 100BaseT 

data interface port. The SDIDU

 provides network management data on 10 Mbps ports 

accessible via the 10/100BaseTX port. The Central Processor Unit (CPU) provides the 

embedded control and network element functionality of the OAM&P. The CPU also 
communicates with other functions within the SDIDU

 for configuration, control, and 

status monitoring. The CPU passes appropriate status information to the SDIDU

 rear 

panel display. 

The power supply converts -48 Vdc to the DC voltage levels required by each component 

in the system.  

The consecutive point network architecture is based upon the proven SONET/SDH ring. 
Telecommunications service providers traditionally use the SONET/SDH ring architecture 

to implement their access networks. A typical SONET/SDH network consists of the 
service provider’s Point of Presence (POP) site and several customer sites with fiber optic 
cables connecting these sites in a ring configuration (see Figure 2-6). This architecture 

lets providers deliver high bandwidth with high availability to their customers.