• FXS/FXO
FXS (Foreign Exchange Station) provides traditional PSTN voice service on MSAP2000 platform. FXS plugged into the RT shelf (Remote Terminal) will be connected to the customer’s facilities such as telephone, FAX machine, analog modem etc.

FXO (Foreign Exchange Office) is installed in the COT shelf (Central Office Terminal) to provide sixteen 2-wire switch interfaces. Each shelf allows 16 FXO line cards at most, and therefore can offer 256 interfaces as a maximum. In addition, in order to meet the needs of the increased number of customers, MSAP2000 can connect up to 8 shelves by using the expansion system of ELM and EPM (Expansion Link and Processing Modules. The maximum capacity extension can reach 1,890 voice service lines.


• Pay Phone
On MSAP2000 platform, FXO-P (Foreign Exchange Office – Pay phone) receives and switches the billing signals from the polar operation and 12 or 16 KHz. The signaling can be delivered to FXS-P installed at RT and becomes the corresponding billing signals so that the billing system of payphones can be driven.


• 2W/4W E&M
The E&M service card provides either two- or four-wire service. It supports four subscriber line circuits configured for operation in E&M types I or V. (A special version of E&M will support various operation type of E&M mode I, II, III, IV, and V.)