The PAL system has several types:

• PAL B, G and I; There are three types of systems with similar characteristics, 625-line systems with a color subcarrier frequency of 4.43 MHz.
• PAL M, 525 line system with a color subcarrier frequency of 3.58 MHz.
• PAL N, It has the same color subcarrier frequency as in the PAL M system but with 625 resolution lines.

The second is divided into 25 frames per second. When it comes to 625 lines, the frame is divided into two fields.