Chapter 1
General Information
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.
