Alcatel-Lucent 5530 - Manual (Page 9)

Alcatel-Lucent 5530 Network Analyzer 9
Embedded line testing technologies
The Alcatel-Lucent 5530 NA relies on several embedded testing technologies.
The Single Ended Line Test (SELT) is a reflectometric test mainly aimed at
measuring line length and locating line problems. Consequently, it is used
for the estimation of potential line capacity or for the location of possible
line impairments.
The Dual Ended Line Testing (DELT) is based on the exploitation of DSL
physical layer parameters. DELT testing identifies issues on the higher line
frequencies, and enables the detection of problems such as bad contacts,
interference, unbalanced loops, etc.
The Narrow-Band Line Testing (NBLT) includes an array of electrical
tests such as POTS LT self-test tests and telephone terminal tests. These
are supported by the POTS ports implemented in the ISAM products family,
which integrates voice capability.
Figure 5. Comprehensive line testing technologies
xDSL2 LT
Loop not synchronized
SELT
(Broadband
spectrum)
DELT
(Broadband
spectrum)
NBLT
(Narrowband
spectrum)
In-service monitoring (synchronized)
or loop diagnosis mode
Inward self-test: POTS LT
Outward testing: loop/phone
POTS LT
SELT-Enabled LT
Reflectometry
How the Alcatel-Lucent 5530 NA works