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Fig. 1 | Large-scale Assessments in Education

Fig. 1

From: Skills, earnings, and employment: exploring causality in the estimation of returns to skills

Fig. 1

Source: Falck et al. (2016)

The Structure of a DSL Network. The figure shows the structure of a DSL network that relies on the “last mile” of the preexisting fixed-line voice-telephony network. The “last mile” consists of copper wires connecting every household via the street cabinet to the main distribution frame (MDF). At the MDF, a DSLAM (Digital Subscriber Line Access Multiplexer) is installed that aggregates and redirects the voice and data traffic to the telecommunication operator’s backbone network.

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