I saw this cable tracer equipment in use few days ago connected to a telephone cable. Here is the device connected to the cable.
Closer view of the device reveals code CTT45 type code and manufacturer name VESALA.
This CT45 is designed for tracing buried cables, conduit, sewer-pipes and blockages.
“CT45 cable and wire
tracer enables telecom technicians and electricians to locate various types of cables and associated problems. For
example, telecom and mains cables wire pairs, under floor heating cables, cable conduit and even sewer-pipe blockages”
In galvanic usage (direct cable connection in low voltage applications like used here) the CTT45 provides accurate cable tracing or long-range pair identification or fault-sport tracing with wired connection to the target with 1 kHz feeding frequency. The transmitter also supports inductive feeding to high voltage (typically mains) application (with a PM34 clamp on transformer accessory).
CTR45 receiver recognizes and traces the 1kHz and 10kHz signals generated by the transmitter (can also trace 50 Hz mains wires).
In the end of brochure there are some more technical data:
Galvanic output signal is 1024Hz/10,000Hz interrupted or modulated sinusoidal wave. For inductive connection the signal 10,000Hz only. Galvanic output level is approximately 40V RMS (quite high compared to other cable tracers I have used) and impedance is around 450 ohms. That means that the device can push up up nearly 100 mA current to the cable. With 40V amplitude and limited current, the signal sent by it would not be more dangerous than voltages normally present on telecom wiring (typically 48V DC and up to 90V AC ring signal).
The signal generator looks many ways quite similar what other Cable tracers I have tested I have used. I would think that this CTT45 transmitter would work quite well also with my Cable tracing inductive amplifier circuits and with Cable tester NF-8209 receiver. In my own cable tracing and I often used around 8-9V peak to peak square wave signal transmitter (output impedance fed hundred ohms).