ANALOG MODULATION MODE
3-58
Sequential calling tones
There are eight sequential calling tone standards available, each having 16 set tones, see Tone
Standard Selection Menu, Fig. 3-59. They are, CCIR, EURO, DZVEI, ZVEI1, ZVEI2, EEA, EIA
and NATEL. There is also provision for the user to define sets of user tones in USER1 and
USER2. DTMF signalling tones can also be generated if the second modulation oscillator (Option
001) is fitted.
Sequential calling tones are set up from a utility menu, Fig. 3-69, and are activated by pressing
[Send Tones]
which appears on the main menu after the tones have been set up.
[Send Tones]
also
appears on the calling tones menu.
Tone selection
Pressing the
[Calling Tones]
soft key at
Utilities Selection Menu 1
calls up the
Sequential Calling
Tones Utility
menu, see Fig. 3-56.
Tone
Sequence
Duration
Sequence
Freq.
Offset
Extended
Duration
Define
Repeat
Start
Delay
LOCAL
Mode
Control
Select
Standard
Edit
Standard
Store
Tones
Recall
Tones
Sequential Calling Tones Utilty
Current Standard: CCIR
Mode: NO MODULATION SELECTED
C0010
Tone Seq.:
Dur. Seq.:
Frequency Offset :
0 %
Extended Duration: 500 ms
Repeat Tone
:
E -
Start Delay
: 200 ms
Default Duration : 100 ms
Gap : 6 ms
FFFFFFFFFFFFFFF
- - - - - - - - - - - - - - -
Fig. 3-56 Sequential calling tones utility menu
[Tone Sequence]
Pressing this key causes hexadecimal data entry keys to appear at the left-hand
side of the menu. To change the sequence, enter the tone numbers via the digits 0-9 on the
numerical key pad and the soft keys
[A]
to
[F]
and press [enter].
[Duration Sequence]
Pressing this key causes
[Default Duration]
and
[Extended
Duration]
to
appear at the left hand side of the menu. Press either key in turn to set the duration of tones in the
sequence. A dash (-) indicates the default duration and
E
indicates an extended duration. These
two keys disappear when [enter] is pressed.
[Define Repeat]
allows a repeat tone to be defined, by using the
[A]
to
[F]
keys and the key pad
and pressing enter. For example, if the repeat tone is defined as tone C, the sequence 11111 will be
sent as 1C1C1 so that the receiver decoders will sense a change in frequency at the start of each
digit sent.
[Freq. Offset]
This facility alters the nominal tone frequency by a set percentage (up to ±10%) for
use in tolerance testing. To change the frequency offset value, select
[Freq. Offset]
and enter the
new value on the key pad. Terminate with the [%] key.
[Store Tones]
Up to 20 sequence set-ups can be stored. Use the key pad to enter the store location
number and press [enter].
[Recall Tones]
To recall a tone sequence, use the key pad to select the required store location and
press [enter].
[Start Delay]
The delay before the tone sequence starts and the gap between sequences can be
adjusted by pressing this soft key, entering the required delay time on the key pad and pressing
[ms].