Instruction manual

ACU-1000 Operations Manual
Interoperability Now 2-43
2.12.4 DSP-2 Jumper Settings
Figure 2-12 shows the locations of jumpers on the DSP-2 module that set the configuration of
the Receive Audio Input and another jumper that allows the VoIP features of the module
configuration to be quickly reset to factory default settings.
Table 2-13 RX Audio Input Configuration Jumpers
RX Input Configuration JP1 JP2
Balanced 600 ohms Lo Bal
Balanced High Hi Bal
Unbalanced 600 ohms Not Available Not Available
Unbalanced High Hi UnBal
The DSP-2 JP1 and JP2 jumpers set the audio input configuration for either 600 ohms
balanced; 600 ohms high impedance, or single-ended (unbalanced) high impedance as listed in
Table 2-13.
Some early version DSP-2 modules had a different audio input configuration circuit. These
modules are configured by jumpers labeled J23 and J15. If the DSP-2 module has JP1 & JP2
installed, there is no J15 and JP23 does not affect the audio input configuration, but may have
another purpose. If there is no JP1 & JP2, J15 and J23 configure the audio input as shown in
Table 2-14.
.. ....
JP23
1 2 3
JP22
3 2 1
DSP-2
Ethernet
Connector
BAL, 600 ohms
UNBAL, High Z
Restore Defaults
Normal
...
JP1
LO HI
...
JP2
UNBAL BAL
If Board has JP1 & JP2,
JP23 does not affect input
Figure 2-12 DSP-2 Module Showing Jumper Locations