
Mode Dip Switch Settings U301
S301 controls the operating mode for System B and S302 controls the operating mode for System A.
Settings are summarized as follows:
TABLE 3. Mode DIP Switch Settings for Programmed Chip P/N 90157640500 (version 1.0)
| 
 | Switch Settings | 
 | Description | ||
| 
 | 
 | 
 | 
 | ||
| 1 | 2 | 3 | 4 | ||
| 
 | |||||
| 
 | 
 | 
 | 
 | 
 | |
| Open | Open | Open | Open | Configuration 1,  | |
| 
 | 
 | 
 | 
 | 
 | |
| Closed | Open | Open | Open | Configuration 2,  | |
| 
 | 
 | 
 | 
 | 
 | |
| Open | Open | Open | Closed | Configuration 3, Tone Test Mode | |
| 
 | 
 | 
 | 
 | 
 | |
Tone Test Mode:Disables internal suppression of tones.
TABLE 4. Mode DIP Switch Settings for Programmed Chip P/N 90157640500 (version 1.1)
| 
 | 
 | Switch Settings | 
 | Description | ||
| 
 | 
 | 
 | 
 | 
 | 
 | |
| 
 | 1 | 2 | 
 | 3 | 4 | |
| 
 | 
 | 
 | ||||
| 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
| 
 | Open | Open | 
 | Open | Open | Configuration 1,  | 
| 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
| 
 | Closed | Open | 
 | Open | Open | Configuration 2,  | 
| 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
| 
 | Open | Open | 
 | Open | Closed | Configuration 3,  | 
| 
 | 
 | 
 | 
 | 
 | 
 | |
| 
 | Both sides of the line can talk simultaneously. | |||||
| 
 | Only one side of the line can talk at a time and the other side must wait until the first side is | |||||
| 
 | 
 | 
 | 
 | 
 | done talking before responding.  | |
| 
 | 
 | 
 | 
 | 
 | duplex mode. | |
| Noise Suppression: | 
 | The unit suppresses background noise in absence of speech. Configuration 3 disables this | ||||
| 
 | 
 | 
 | 
 | 
 | suppression. | |
20
