 |
| protection switching: 71 phrases in 13 subjects |
| Communications | 2 |
| Electrical engineering | 1 |
| Electronics | 1 |
| General | 3 |
| Information technology | 3 |
| Makarov | 2 |
| Mass media | 1 |
| Military | 1 |
| Nuclear and fusion power | 1 |
| Oil and gas | 1 |
| Technology | 8 |
| Telecommunications | 46 |
| Weapons of mass destruction | 1 |