Specifications

Net-2000™ VCU Users Manual

Version 4.0, December, 2013

IP Mode

ith the HPD not checked (not enabled) the vocoder creates a period of constant pitch when it receives any pitch

fluctuations above the maximum pitch limit. During this time the decoded voice may sound somewhat different but

is still understandable and the intelligibility is reasonably preserved.

The High Pitch detection feature is available with the following vocoder:

Vocoder

GMR-2+ Vocoder

4.10 Source Selection

Figure 22 Voice Source Selection

4.10.1 Voice Source

The Voice Source menu provides the user the choice to select which input source will be used on the Net-2000™-

VCU. The default source is set to 4-Wire. Only one source may be selected at a time. After switching from one

voice source to another it is necessary to select the start button in order to initiate the change.

4.10.1.1 Handset

When the Handset voice source interface is selected, the Net-2000™-VCU expects the analog voice signal input and

output on the RJ11 jack (Item 8 in Figure 1 Net-2000™-VCU Rear Panel). The output will also be on the output

RCA

jack (Item 6 Figure 1 Net-2000™-VCU Rear Panel). The Net-2000™-VCU outputs the audio to both the 4-

ire and Handset output regardless of which voice source is selected.

4.10.1.2 4-Wire

When the 4-Wire voice source interface is selected, the Net-2000™-VCU expects the analog voice signal input on

the RCA jack (Item 7 in Figure 1 Net-2000™-VCU Rear Panel). The unit outputs the analog signal on the output

RCA

jack (Item 6 Figure 1 Net-2000™-VCU Rear Panel). The Net-2000™-VCU outputs the audio to both the 4-

ire and Handset output regardless of which voice source is selected.

4.10.1.3 2-Wire

Before selecting the 2-Wire voice source the Net-2000™-VCU expects to be connected to a North American POTS

line. A industry standard telephone cord can be used to connect the wall jack to the RJ11 jack (Item 5 in Figure 1

Net-

2000™-VCU Rear Panel). When the 2-Wire voice source interface is

selected, the Net-2000™-VCU

automatically “picks-up” (opens) the line. When the voice source set to 2-wire the incoming analog signal from the

POTS line will be encoded and then output to the selected channel interface (RS-422 or Ethernet). If the Ethernet

loopback channel is selected then the encoded speech will be decoded and sent out through the POTS line. The Net-

2000™-VCU 4-Wire and Handset outputs are not active. The POTS line can be hung-up (released) by selecting the

Stop VOIP button.

(Subject to Change) Page 25

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