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Chapter 1
General Information
7
Chapter 1
General Information
INTRODUCTION
The CE4000 TDR (Time Domain Reflectometer) module is for
use with the CM1000 Cable Modem System Analyzer. The
Cable Modem System Analyzer tests both upstream and
downstream DOCSIS (Data Over Cable Systems Interface
Specification) paths in terms of error rate, transmit level, lost
packets and cable modem power ranging and registration. The
CE4000 TDR module is used in conjunction with the CM1000
to locate cable faults.
INSTRUMENT OVERVIEW
The CM1000 mainframe unit (Figure 1-1) houses the CE4000
TDR plug-in. The hand-held device features a full color display,
which indicates instrument status, signal identification, and
measurement values. The controls are pressure-sensitive keypad
switches with tactile feedback. A 75-ohm “F” connector accepts
the cable connection. A female DB9 provides access to a
computer serial interface connection. The DC input accepts
power from the supplied AC adapter. The weatherized hard
plastic case provides excellent protection from typical bumps
and bangs of normal use. Back panel access is provided for easy
battery pack replacement and the system memory card is readily
accessible from the side panel of the unit.
When installed in the mainframe, the CE-4000 plug-in module
provides comprehensive TDR testing capability. When activated,
the CE4000 TDR goes through the self-mode and provides the
user with a menu of TDR tests. The user may select an Auto Test
mode, Manual Test mode, recall stored data or set up the
configuration of the TDR. Once a cable is selected or the VOP
is set, the Auto Test mode will automatically identify any
impairments on the cable under test, greatly simplifying operation.
Note: This manual covers CE4000 TDR model and its
options. A software upgrade is required to use the
CE4000 module in an existing CM1000. Software
upgrades are available from the Sunrise web site:
www.sunrisetelecom.com.