VOICE TONE MODULE (VTM)SECTION 18 VOICE TONE MODULE (VTM)
18.1 DESCRIPTION

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.

18.2.2 VTM SWITCH SETTINGS

Table 18-2 VTM BOARD SWITCH SETTINGS

 

Switch

VTM startingSections

 

slot

1

2

 

 

 

 

 

 

 

S1

 

0*

Closed

Closed

 

 

8**

Open

Closed

 

 

16

Closed

Open

 

 

24

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.

18.2 SETUP PROCEDURE

18.2.1 VTM JUMPER PLACEMENT

Table 18-1 VTM BOARD JUMPER

PLACEMENT

JU

Pin

Description

 

 

 

J11

2 to 2*

Selects 27256 EPROM operation

J12

3 to 3*

 

 

1 to 1

Selects 27128 EPROM operation

 

3 to 3

 

 

1 to 1

Selects 2764 EPROM operation

 

3 only

 

J20

1 to 2

Transmit PCM Bus line

 

2 to 3*

VTM PCM Bus line

*Setting for Normal operation.

18.3 ALIGNMENT SPECIFICATIONS

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".

NOTE: Revision 2 or earlier should have the line from P1, pin 1 to R25 cut. Revision 3 or later should have Jumper on -pin 1 only.

18-1