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The TC22 line-powered telephone balance unit provides a high degree of separation between send and receive signals, enabling 4-wire communications systems to interface with the telephone network. In telephone IFB applications, the high drive capacity at the 4-wire output enables a presenter's earpiece to be connected directly to the unit without an external amplifier.


• Isolated, full-duplex 4-wire interface to non-digital telephone direct exchange lines.
• The unit is line powered, requiring no battery or external power.
• Simple optimization of sidetone rejection with any country’s telephone system.
• LED's indicate "ring" and "off hook" conditions.
• Input level control with line-sensing limiter and limit indicator.
• High drive output with level control for direct feed to presenter’s earpiece, etc.
• Loop-through British & American line sockets provide universal connection to line and telephone set.
• Connection to the telephone set is maintained while the unit is in use.
• Small, rugged metal case with XLR3 male & female 4-wire connectors.