Table 1 shows the grounding specifications for communication power supplies.
No. |
Description |
|---|---|
1 |
The inlet for the AC power cable at the equipment room should be equipped with a surge protection device (C-level) with a nominal discharge current no less than 20 kA. |
2 |
The protective ground for the power supply and that for communication equipment share the same grounding conductor. If the power supply and the equipment are in the same equipment room, use the same protective ground bar for them if possible. |
3 |
Use a surge protection circuit on the AC power interface. |
4 |
The positive of the -48 V DC power supply or negative pole of the 24 V DC power supply should be grounded at the output of the DC power supply. |
5 |
The working ground and protective ground of the DC power supply equipment should use the same grounding conductor with the protective ground of the switching equipment. If the power supply and equipment are in the same equipment room, use the same protection ground bar for them if possible. |
6 |
Add surge protection on the DC power interface. |