Teltone TLS-4, Telephone Line SimulatorCondition:* Used, Removed From Service In Working Condition. Unable To Test. As Pictured.Additional Notes:* Offers a convenient means for setting up temporary telephone lines to demonstrate or test equipment where actual central office lines are not easily available.* Provides four simulated lines, two talk paths or connections, and an audio interface port* Programmable operations: Two phone numbers for each line Forced disconnect Hot line (ringdown) number Ring cadence 1-3 rings Hunt groups Immediate or dial access to audio port Tone or recorded message when an invalid number is dialed Monitor mode (allows recording phone calls for training use) PBX-like operations: call transfer, add on, hook flash Timing adjustments Second dial tone simulates outside line access Tone following disconnect* Provides four lines and two connections* Portability and quick, convenient setup* Accepts tone and rotary input* Ringing voltage source with short circuit protection* AC Powered (Battery Not Required)* Non-Volatile Memory (Battery Not Required)* Generates precise call progress tones* Ground reference jack* -48 V ground referenced line voltage* Audio portTeltoneTLS-4