Figure 3.4.3 RGU connector and protection switch setting
Following table shows the connector and switch on
| Switch | Description | Remark | |
ISSUE 1 |
| Manufacturer | ||
| setting |
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CN23 |
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| Pin 1&2 short: 50Hz ring signal(sine wave) | Dependent on country |
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| RGU plugged: 25Hz ring signal(square wave) | adaptation. | |
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| ON: For database protection. | Turn ON the switch |
SW 1 |
| OFF: For system default. | after system power on. | |
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| OFF : Loop back OFF | OFF (Always) | ||
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The MBU has a two position DIP switch(SW1). The following is the function of each switch position :
Knob 1 System data base initialization when power on
Knob 2 ISDN Loop Back on
Before programming the system, SW1(knob 1) should be placed in the Off position and turn the system power off and on to initialize the system database to default. Once the database has been initialized, SW(knob 1) should be placed in the on position to protect the database in the memory. Refer to Figure 3.4.3.
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