Operation; Managing Phone Lines; Return To Phone Line; Output Level - Solidyne HL 202 Manual De Usuario

ENGLISH TELEPHONE HYBRIDS HL202 & 203VQ

3 OPERATION

3.1

Managing phone lines

A button system allows each phone line taken from the hybrid (ON-AIR) retained with on-air audio
(HOLD) or transfer it to a telephone set (OFF).
The call is generated from an associated phone. But it can be received with your partner or directly
from the Hybrid, as a blue LED (ring) flashes indicating incoming call.
The HOLD function is used to, once made (or received) the call, take the phone line from the hybrid,
allowing the caller to listen, while waiting, the on-air signal.
In order to air the call, press AIR and open the corresponding channel on the console.
The function OFF, disconnect the telephone line from hybrid and connecting to the phone set. When
the operator does not use a telephone line, the switch must be OFF, so that the line was connected
to the phone set.
To receive a call line will be OFF, so that the call rings on the phone.
If the phone is hung and you press OFF during a call, you will lose communication. To transfer the
line is on the air to the phone, you must pick up it first and then press OFF.
In each line a LED indicates if the line is on hold (LED flashing) on the air (LED on) or assigned to the
phone set (LED off).

3.1.1 Return to phone line

Most of the existing telephone hybrids on the market today, were designed over 30 years ago for
analogue telephone exchanges (PBX) Solidyne hybrids, however, have been recently designed for
private or public telephone exchanges today, which are fully digital. The new technology Hybrids are
recognized because they have no control of air return level to phone line. This is because inside the
hybrid Solidyne uses an audio processor for return signal that includes AGC, peak limiter & audio
signal filtering. Therefore the return is automatically adjusted during the transmission and its level is
the maximum allowed by the modern digital telephone exchanges.
If you want to check the return level to phone line, you must use an oscilloscope to be placed in
parallel with the telephone line and must verify that the signal is 2 volts peak to peak. Please note
that above this level the return can produce problems that will cause intermodulation distortion in
the audio signal on air.
When a hybrid features a feedback control, the level set by the operator can be excessive, causing
the voices of local journalists and the caller to be distorted. For this reason we have removed this
control in the line of simplified hybrids. So that the audio quality on the air does not depend on an
operator setting but is always achieved.
The HL series uses a narrow-band return filter. Then the return signal is limited to the band 400 –
2.200 Hz in order not to distort the signal to the air. This narrow band intelligibility remains high (due
to processing) but occasionally may seem to the remote people that it "has little volume" because
his band is narrow. This should not worry because it is a subjective sensation that does not affect
the intelligibility of speech.

3.1.2 Output level

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