Cisco Model 6109 6 MHz Off-Air Reference (NTSC) 安装指南
Chapter 1 Overview
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The USRM can operate in conjunction with the DNCS. In such systems,
responsibilities for real-time session and resource management (SRM) may be
assigned to USRMs by "relocating" the DNCS's SRM into the USRM platform. Such
session and resource management may include VOD and SDV. In these systems, the
USRM is provisioned by the DNCS. In non-DNCS systems, the USRM is
configurable independently of the DNCS using its Web interface.
A key design goal of the modular USRM design was service velocity. The software
A key design goal of the modular USRM design was service velocity. The software
design and modular nature of the USRM helps to achieve this. New applications and
interfaces may be developed and installed, in some cases at run-time, without
service interruption and often without requiring any changes on the DNCS. The new
capabilities inherit the platform capabilities, such as high-availability, Web interface
and the ability to interconnect to many different devices.
The USRM is configurable with various combinations of the applications and
The USRM is configurable with various combinations of the applications and
interfaces shown in the previous diagram to meet system needs.
USRM Block Diagram and Nomenclature
This section defines the USRM components and nomenclature. The USRM software
consists of a set of modular software components. Base "platform" components
provide the basic USRM functions. Applications, resource model, and resource
adaptor "plug-in" components are then installed on the USRM to implement a
specific application service with specific protocols and network devices.
The USRM can be envisioned as a software representation of a traditional
The USRM can be envisioned as a software representation of a traditional
communications equipment chassis. An application, like a front line card is installed
on the USRM to provide a specific application service (e.g., SDV). Resources, like the
rear I/O card, are called resource models and are installed on the USRM to support a
specific device (e.g., xDQA-24). Unlike a communications chassis, the USRM must
support many protocols on its midplane. The resource adaptor is installed to
implement a specific communications protocol (e.g., GQI, R6, etc.).
A block diagram of the USRM is shown in the following illustration.
A block diagram of the USRM is shown in the following illustration.