Audio system with “2Plus ” digital installation uses 2 unpolarized wires only (no matter about the way they are connected), being possible the connection of up to 120 telephones and combinations of up to 3 accesses (door panels) without switching units . Other onfigurations can be draft when combining “2Plus” system with “Plus” system by using CD-2Plus gateway. The necessary components for a system of these characteristics are:

• These panels allow configurations of up to 120 push buttons; in case of a higher number of apartments coded panels can be used.
• On buildings with one or several accesses (door panels), use one EL620/2Plus module for each panel.
• When systems with more than 2 push buttons, order as many EL606D or EL610D digital push buttons electronic modules as required for the panel. On panels with more than one horizontal module, use one RAP-610D link cable for each additional horizontal module.
• On residential condominiums with main entrance(s) door panel(s) and several internal buildings , configure the internal buildings as described on the previous paragraph, adding a CD-2Plus gateway on each. The main entrance(s) door panel(s) must be configured as “Plus” digital system, being the installation between them and the internal door panels of 4 wires.

• Coded panels or porter’s exchanges can be used from “Plus” system. The use of a CD-2Plus gateway will be required.
• Use T-5720 or T-5822VD telephones. The maximum number of units inside the same apartment is two (three in case of T-5822VD).
• Use a FA-Plus/C power supply for each door panel, with no dependence on the telephones amount. In case of CD-2Plus gateway, use an additional FA-Plus/C power supply for each gateway.
• Use a 12V d.c. lock release . Is it possible to use a.c. lock releases, by adding a TF-104 transformer.