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1. Switching On, Synchronization, Adjusting the Speaker Volume

2.2

Power supply and operating time

A 3.6 V/600 mAh rechargeable battery in the right headset muff provides the power supply for the

headset. With a fully charged battery the operating time for continuous operation is approx. 6 hours.

2.3

Audio signals used

Two different tones are used for signalling the operating statuses. The tone for the indication of positive

responses (P-tone) has a higher frequency than the tone for the indication of negative responses (N-

tone). Signalling of the various events is effected by a varying number of consecutive P-tones or N-

tones.

Positive acknowledgement tone

All positive responses are indicated by a high P-tone.

Negative acknowledgement tone and error tone

All negative responses and error statuses are indicated by a low N-tone.

Battery warning

If the battery has an undervoltage a low 3-fold N-tone sequence »N-N-N« sounds approximately every

10 seconds in the headset.

Range warning

If the range limit is reached, a high 3-fold P-tone sequence »P-P-P« sounds approx. every 5 seconds in

the headset.

2.4

Sidetone

The sidetone while speaking is audible in headsets only after interconnection setup between the

headsets (see sections 4.4...4.4.2). Due to this a control is always available as to whether a connection

is active or not.

2.5

On/Off switch for the microphone

The microphone can be switched on and off with the switch »Mic.–OFF–Mic.« (Fig. 1/h) at the bottom of

the right-hand headset muff. Three switch positions are possible. However, communication can only be

performed after subscription (sections 3...3.2.2), switching on, synchronization, adjustment of the

speaker volume (section 4.3) and connection setup (sections 4.4...4.4.2) have all been effected.

Middle position »OFF« (receive): The headset microphone is switched off. You can only receive.

Front switch position »Mic.« (transmit and receive): The headset microphone is switched on. You

can speak into the microphone as long as you hold the switch in this position and simultaneously a

message is being received. After releasing the switch the switch returns to the middle position »OFF«.

Rear »fixed«switch position »Mic.« (transmit and receive): The headset microphone is constantly

switched on. You can speak into the microphone and simultaneously receive a message.

On-air subscription

3.1

General

Each headset has its own identification number. First of all an allocation must always take place

between the base headset and the maximum of two standard headsets. This subscription procedure,

which has to be perfomed once only, is performed on the base headset and the maximum of two

standard headsets manually by means of an operator control procedure.

If a base headset or a standard headset is set to subscription mode and this is terminated after

2 minutes without the subscription procedure having been successfully concluded, the data bases of

stored standard headsets available on the base headset and in the case of the standard headset the

available data base for the stored base headset are deleted (»Time Out«).

Once the subscription procedure has been successfully concluded, the identity of the calling party is

stored in the data base of the headset. The standard headset stores a base headset. The base headset

stores the last two successfully subscribed standard headsets, a repeat subscription being permitted.