Specifications

Net-2000™ VCU Users Manual

Version 4.0, December, 2013

IP Mode

Figure 25 Channel Source

4.11.1 Channel Source Selection

Figure 26 Channel Source Selections

4.11.1.1 Ethernet Loopback (Local)

In loopback communications mode the Net-2000™-VCU will encode speech received on the selected voice source

input (Handset 4-Wire or 2-Wire) and play out the encoded/decoded speech on the handset and Line-Out interface.

This channel selection is useful when encoding / decoding recorded voice samples as a quick analysis of the selected

vocoder.

When Loopback communications mode is selected the Net-2000™-VCU sends data over the internal loopback

Ethernet address of 127.0.0.1 Loopback can also be accessed by entering in the IP or host name of the Net-2000™-

VCU in the Target IP address box.

4.11.1.2 Ethernet Channel Source Interfaces

Selecting Ethernet as the Channel source allows the Net-2000™-VCU to communicate to another device across an

Ethernet network.

When running in VOIP Mode the VCU encodes a frame of speech from the specified voice interface and sends the

encoded data over the Ethernet channel interface to the target IP address. At the same time the VCU expects to

receive packets from the Ethernet communications channel interface that contains a decode command and encoded

data.

4.11.1.3 RS-422 Asynchronous and RS-422 Synchronous Interfaces

When either of the RS-422 interfaces are selected the Net-2000™-VCU encodes speech received on the selected

voice source input (Handset 4-Wire or 2-Wire) sends out the encoded speech data over the selected RS-422

interface. This channel selection is useful when encoding / decoding voice between two Net-2000™-VCU that are

not located far apart. Two Net-2000™-VCU units can be easily connected together using the Asynchronous

connection and a crossover CAT5 cable. See Section 5 for connector pinout details.

In VOIP mode the Net-2000™-VCU also transmits packets over the asynchronous RS-422 interface when the

Ethernet interface is the channel source. This is a useful method to monitor the Net-2000™-VCU channel data.

NOTE: DO NOT attempt to connect or use the RS-422 Asynchronous and RS-422 Synchronous ports at the same

time.

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