| Marketing Information | FXS module provide a quick and simple upgrade path for TSU multiplexers requiring support for PBX's, KSU's, analog telephones, dial-up modem pools, fax machines and leased line modems.
For applications involving message waiting or the requirement for more robust ringing voltage, the FXS+ (MW) module is available. This module, in plug-in format, provide interoperability with the FXO modules for support of message waiting applications.
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