User Manual

ADCP-75-192 • Issue D • October 2005 • Section 1: Overview
Page 1-4
 2005, ADC Telecommunications, Inc.
The Digivance CXD Element Management System is a Web based system that provides the
various control and monitoring functions required for local management of each CXD system.
The user interface into the EMS is a PC-type laptop computer loaded with a standard Web
browser. The EMS is connected to the Master CPU through an Ethernet connection. Operation
is effected through the EMS Graphical User Interface (GUI). The GUI consists of a series of
screens from which the user selects the desired option or function. Ethernet ports are available
at the Hub and RAN CPU for connecting the EMS computer at either location.
For management and operation by a customer supplied Network Management Systems (NMS)
the Digivance CXD has imbedded in software a Simple Network Management Protocol
(SNMP) Agent and ADC Management Information Bases (MIBs). Local communications with
the Digivance CXD SNMP Agent system is supported through the IP interface at the Hub or
RAN. All CPUs in the Digivance network support the SNMP to provide NMS monitoring and
control access to the Digivance system. The NMS sends SNMP SET and GET messages to the
various nodes in the Digivance CXD/NXD network in order to access MIB’s, which define the
interface to the Digivance system.
2.4 Remote NOC Interface
Remote communications between a Network Operations Center (NOC) and a networked
grouping of multiple Digivance CXD systems is also supported by the Digivance CXD SNMP
Agent. The primary component of the remote NOC interface is a PC-type desktop computer
loaded with a customer supplied Network Management System (NMS). A NMS operating at a
customer NOC is able to discover and manage multiple Hub and RAN sites independently or
as a distributed network.
3 SYSTEM FUNCTIONS AND FEATURES
This section describes various system level functions and features of the Digivance CXD.
3.1 Fiber Optic Transport
The optical signal of a Digivance CXD is digital, the input and output RF signal levels at the
HUB SIF or the RAN SIF are not dependent on the level of the optical signal or the length of
the optical fiber. The maximum length of the optical fibers is dependent on the loss
specifications of the optical fiber and the losses imposed by the various connectors and splices.
The system provides an optical budget of 10 dB (typical) when used with 9/125 single-mode
fiber, or 22 dB with extended optics.
The optical wavelengths used in the system are 1310 nm for the forward path and 1310 nm for
the reverse path. Different wavelengths may be used for the forward and reverse paths
allowing for a pair of bi-directional wavelength division multiplexers (WDM) or course
wavelength division multiplexing (CWDM) to be used in applications where it is desirable to
combine the forward path and reverse path optical signals on a single optical fiber. One WDM
or CWDM multiplexer/demultiplxer module may be mounted with the Hub and the other
mounted with the RAN. The WDM or CWDM passive multiplexers are available as accessory
items.