Where can I find a Data Sheet for the TI-101 Telephone Interface?
TI-101 Data Sheet
: TI-101 Telephone Interface
Where can I find schematics for the TI-101 Telephone Interface?
TI-101 Schematic
Where can I find a User’s Guide for the TI-101 Telephone Interface?
TI-101 Users Guide
How do I adjust the null on the TI-101 Telephone Interface?
Place an outside call to someone. Once on the line, have them put the telephone handset down in a quiet place. Connect pink noise, white noise or simply music to the HOST INPUT. Listen, or meter, the CALLER OUTPUT and…
The announcer’s voice sounds “hollow” when we use the TI-101 Telephone Interface.
Under normal conditions you will notice leakage of the host audio into the caller audio. This is the nature of analog hybrids. When properly adjusted, the caller's audio level should be 3 to 6dB higher than the host audio leakage.…
TI-101 Telephone Interface has hum in the caller audio
The signal to noise performance of the TI-101 can be improved 15 dB by relocating the power transformer. If your power transformer is mounted on the bottom of the chassis its field induces hum into the caller output transformer. Remounting…
TI-101 Telephone Interface won’t hold the phone line open.
It was not designed to. The TI-101 requires a telephone holding coil wired in parallel with the telephone input connections. Use a Microtran T4415. It is a choke rated at 2.0 Henrys @ 60 mA, with a DC resistance of…
Will the TI-101 Telephone Interface work with an electronic telephone system?
The design of the TI-101 limits its dependable use to standard central office lines. Installing an analog adapter or analog circuit card in the system might be a solution. It is your only choice if the telephone system digitizes the…
