The one-way connection going in the direction FROM an end-user device (such as a phone) TO a network and/or server (such as a mobile phone network).

A two-way (bi-directional) connection generally contains both an uplink and downlink connection.

An asymmetrical two-way connection has a faster maximum speed (data rate) in one direction than the other. Typically, the downlink / download direction is the faster one.

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