The licensed engineer is serious ･･･.

Well, the chief telecommunications engineer is studied today and the material on [masuyo] [ima] day is ↓↓.
- Telephone call road system of digital switchboard for telephone

Because the digital telephone call road cannot pass the high-power signal of the call signal etc. , the call signal sending function to inform the telephone of arriving has been installed in the subscriber circuit.

These sentences are correct.
- The digital telephone call road cannot pass the high-power.
- The call signal sending function to inform them of arriving has been installed in the subscriber circuit.



CODEC is composed by the sign machine that converts the PCM signal of the decoder and descending that converts the analogue signal of going up from the telephone into the PCM signal into the analogue signal.


These sentences are wrong.
- "Decode" and "Sign" are simply opposite.



The digital telephone call road installs the circuit for interrupt in the subscriber circuit because the high-power signal for the subscriber examination cannot be passed, catches the local loops, and examines the subscriber.


These sentences are correct.
- The digital telephone call road cannot pass the high-power.
- The function to install the circuit for interrupt, to catch the local loops, and to examine the subscriber has been installed in the subscriber circuit.




The overvoltage protection function to protect the switchboard is possessed from the abnormality voltage that propagates the core wire of the subscriber's cable and invades.

These sentences are correct.
- No O of BORSCHT. ｡





This material : in "Exchange" around here ･･･ omission today because there are neither [tottsuki], [suiyone] [cho] nor time because [kore] is a material that often comes out considerably as an old installation technician.