Viavi OneExpert DSL ONX-580, User Manual

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Chapter 11 Testing with SmartIDs
OneExpert DSL User's Guide
22052280, Rev. 015 April 2019 166
Coax Map test
The purpose of this test is to map out the topology of a coax network, from a single point,
without having to perform a two ended test using far end devices. This measurement can be
used to locate devices in a coax cable such as barrels, splitter, and splices.
1. Connect to a SmartID Plus using Bluetooth.
2. On the SmartID menu, select
Single Ended Coax Map . The Coax Map screen is
displayed.
3. Select Mode and specify a Map Mode:
• Single-Ended Coax Map
• Dual-Ended Coax Map
• VDSL Home Run Check
• Whole-Home Check (no diplexer)
• Whole-Home Check (through diplexer)
The table below describes the Coax Map results.
Results Description Range/Values
Length (ft.)
Total length of the coax leg from test
instrument.
0-500
dBrl Return loss of the coax leg.
Comment
Description of the event that was detected in
the coax cable.
Unknown, Open,
Splitter, Barrel/
Splice, Splitter*, and
Low-Quality Splitter
(see below for
descriptions)
Unknown – This label is used as a last resort when no other signatures can be
identified.
Open – Indicates an event that has high return loss.
• A home-run cable with no passive devices should indicate an open at
close to 0 dBrl
• A cable with a 2-way splitter may have two opens at close to -7 dBrl.
• A cable with a 3-way splitter may have two opens at -14 dBrl and one
open at -7 dBrl