Cisco Model 6109 6 MHz Off-Air Reference (NTSC) Guide De Montage

 

78-4021139-01 Rev D 

11 

 

The USRM consists of a basic executable (usrm) plus a set of modular software 

components in the form of libraries that comprise the basic platform.  The basic 

platform is the set of common core software used in all application-specific versions 

of the USRM.  These basic components referred to as "platform" components are 

linked at run-time using standard Linux shared libraries.  Application-specific 

components that form a specific set of application services are activated and loaded 

as "plug-in" components.  The plug-in component is an isolated software component 

that uses the services of the basic components to provide a service.  A plug-in 

component typically exposes a single API (the notification API) used by the USRM 

to communicate with the component. 
All USRM software components are packaged as Linux shared libraries with the .so 

extension.  The components are situated in different directories depending on the 

purpose of the component.  The USRM depends on this positioning to locate the 

type of component. 
The basis of a software component is the model definition file that defines that data 

model that represents the component.  Every USRM component is based on a model 

file.  The model definition file is a text file that defines the data/attributes for the 

data items that represent the component.  Data items in the data model optionally 

reference method routines.  A naming convention data item (NotifyAPI) defines the 

name of the method routine to receive notifications.  The USRM communicates with 

components using this notification interface.  The method routines also provide 

custom functionality for data. 
In summary, the USRM software consists of a set of platform components and a set 

of plug-in components.  The platform components form the base USRM platform.  

The plug-in components adapt the software to specific network devices and 

protocols and implement applications that provide services to clients.