A CX 2000C-32-R board includes an internal ringer unit: circuitry that can ring a limited number of telephones based on chassis power. This board can ring 12 telephones with a ringer equivalence of 1.0 at one time. Cable length is limited to 3000 feet.
The internal ringer unit circuitry is located on the CX 2000C-32-R rear I/O transition board.
If your board contains an internal ringer unit, you must select the ringing frequency. On the rear I/O transition board, switches 3 and 4 on DIP switch S1 control the ringing frequency. Set the switches as shown in the following table:
|
For a ringing frequency setting of... |
Set S1 switches 3 and 4 (rear I/O transition board) to the following settings... |
|
|---|---|---|
|
Switch 3 |
Switch 4 | |
|
20 Hz (default) |
OFF |
OFF |
|
16.7 Hz |
OFF |
ON |
|
25 Hz |
ON |
OFF |
|
50 Hz |
ON |
ON |
On the rear I/O transition board, switches 1 and 2 on DIP switch S1 control other ringer configuration options. These settings are preset.
|
DIP switch S1 |
Description |
|---|---|
|
1 |
Ringer enabled (default). Set to ON if the internal ringer unit is present on the board. |
|
2 |
Battery return to ground. Must always be set to ON. Do not change this setting. |
Jumper pin block JP1 on the rear I/O transition board specifies the source of the ring voltage:
|
JP1 setting |
Description |
|---|---|
|
Jumper on pins 1 and 2 |
Ring voltage comes from the internal ringer unit circuitry. |
|
Jumper on pins 2 and 3 |
Ring voltage comes from the external power connector (J8). |
Jumper pin block JP4 on the main board specifies whether ring voltage is coming from the rear I/O transition board or from the CompactPCI telecom power bus. For more information, refer to Using the NMS rack mount power supply chassis.
|
JP4 setting (main board) |
Description |
|---|---|
|
Jumper on pins 1 and 2 |
External ring voltage from rear transition board (default). |
|
Jumper on pins 2 and 3 |
Ringing voltage from CompactPCI telecom power bus. |