How the Alcatel-Lucent 5530 NA works

How the Alcatel-Lucent 5530 NA works

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

		Loop not synchronized
	SELT
	(Broadband	Reﬂectometry
	spectrum)	Reﬂectometry
		SELT-Enabled LT
	DELT
	(Broadband	In-service monitoring (synchronized)
	spectrum)	In-service monitoring (synchronized)
		or loop diagnosis mode
		xDSL2 LT
	NBLT	Inward self-test: POTS LT
	NBLT	Outward testing: loop/phone
	(Narrowband	Outward testing: loop/phone
	spectrum)
		POTS LT

Alcatel-Lucent manual How the Alcatel-Lucent 5530 NA works, Embedded line testing technologies