A method of determining a data connection profile for a data connection between one of a plurality of end-user devices (14, 16, 18) and an aggregation transceiver device (24, 34) at which data connections in respect of a plurality of end-user devices are aggregated for onward connection through an access network, the data connection being one of a plurality of data connections belonging to one of a plurality of predetermined categories, each category of the plurality of predetermined categories being associated with one of a plurality of service providing entities (62, 64, 66), each of the plurality of data connections belonging to one of the plurality of predetermined categories, the method comprising, in respect of one of said data connections: receiving performance data indicative of the performance of the data connection (s1, s6); receiving an entity identifier indicative of one of said plurality of service providing entities (s1, s2), and determining in dependence thereon the category from the plurality of predetermined categories to which the data connection belongs; and determining a data connection profile for the data connection in dependence on the performance data, the data connection profile specifying a set of values for one or more parameters associated with the data connection; characterised in that the step of determining a data connection profile for the data connection comprises selecting one of a plurality of profile determination algorithms in dependence on the category so-determined, and using the selected profile determination algorithm to determine the data connection profile in dependence on the performance data, the plurality of profile determination algorithms comprising one or more algorithms chosen from a set of predetermined profile determination algorithms and/or one or more profile determination algorithms provided by a service provider prior to the determination of a data connection profile for the data connection. receiving performance data indicative of the performance of the data connection (s1, s6); receiving an entity identifier indicative of one of said plurality of service providing entities (s1, s2), and determining in dependence thereon the category from the plurality of predetermined categories to which the data connection belongs; and determining a data connection profile for the data connection in dependence on the performance data, the data connection profile specifying a set of values for one or more parameters associated with the data connection; characterised in that the step of determining a data connection profile for the data connection comprises selecting one of a plurality of profile determination algorithms in dependence on the category so-determined, and using the selected profile determination algorithm to determine the data connection profile in dependence on the performance data, the plurality of profile determination algorithms comprising one or more algorithms chosen from a set of predetermined profile determination algorithms and/or one or more profile determination algorithms provided by a service provider prior to the determination of a data connection profile for the data connection.