EFJohnson 3000 SERIES Manuale Utente

18-1

The Voice Tone Module (VTM) provides tone 

and voice message to modules that indicate call 
progress to the users.

The VTM contains 8-fixed slots of digitized 

PCM audio messages stored in PROMs that are 4 
seconds in length and repeat continuously on the VTM 
PCM bus of the Switch (see Table 18-3). The start of 
the message is indicated in the transmission so 
modules can present the audio message to the user 
from the beginning of the message. There may be up 
to four VTMs within a system, depending upon the 
messages required.

18.2.1 VTM JUMPER PLACEMENT

18.2.2 VTM SWITCH SETTINGS

No alignment is required for the VTM to operate 

in the system.  However, panel jack output level is 
adjustable.  The S1 switch setting must be correct for 
the starting slot number.  Use S2 to select a voice or 
tone message.

1. Insert a "butt-set" in the front panel jack.

2. Adjust R22 for a comfortable listening level.

3. If a tone is selected, set the level at TP1, 9 dB lower 

than the level on U24, pin 2 for the proper level to 
the "butt-set".

J11
J12

2 to 2*
3 to 3*

Selects 27256 EPROM operation

1 to 1
3 to 3

Selects 27128 EPROM operation

1 to 1
3 only

Selects 2764 EPROM operation

J20

1 to 2

Transmit PCM Bus line

2 to 3*

VTM PCM Bus line

*Setting for Normal operation.

S1

0*
8**
16
24

Closed
Open
Closed
Open

Closed
Closed
Open
Open

S2 - Monitor Switch.  A front panel,
       16-position switch with two positions for
       each slot.  The switch selects the slot to
       be monitored at the front panel jacks.

S3 - Reset.  Normally open, press to reset.
       Momentary switch to reset module.

* VTM 1
** VTM 2.