2. Air Interface
2.1. The Structure of the Air Interface in GSM
2.2. Physical and Logical Channels
2.3. Logical Channel Configuration
2.4. Interleaving
2.5. Signaling on the Air Interface
2.6. LAPDm
2.6.1. LAPDm Structure
2.6.2. LAPDm Message Types
2.7. Air Interface Messages
3.1. Channel Configuration
3.2. Signaling on Abis Interface
3.3. Dimensioning over Abis interface
3.4. LAPD
3.4.1. LAPD Structure
3.4.2. LAPD Message Types
3.5. Abis Interface Messages