Specifications

Sierra Wireless, Inc. CDPD Primer
2130006 Rev 1.0 Page iv
3.2. Features of CDPD................................................................................................ 12
3.2.1. Packet-Switched .................................................................................. 12
3.2.2. Based on Internet Protocols ................................................................. 12
3.2.3. Full Duplex .......................................................................................... 12
3.2.4. Transmission Rate and Peak Throughput ............................................ 13
3.2.5. Number of Users Supported ................................................................ 13
3.2.6. Coverage and Availability ................................................................... 13
3.2.7. Encryption and Security ...................................................................... 14
3.2.8. Access Control and Congestion........................................................... 14
3.2.9. CDPD Data Transmission Format ....................................................... 15
4. Infrastructure: CDPD Network Architecture ..............................16
4.1. Physical: Components of the CDPD Network................................................... 16
4.1.1. End Systems (M-ES and F-ES) ........................................................... 16
4.1.2. Mobile Data Base Station (MDBS) ..................................................... 17
4.1.3. Mobile Data Intermediate Station (MD-IS) ......................................... 17
4.1.4. Connections to Other Networks – Intermediate Systems (IS) ............. 17
4.2. Services: CDPD Network Services..................................................................... 18
4.2.1. Domain Name Server .......................................................................... 18
4.2.2. Subscriber Location Service ................................................................ 18
4.2.3. Mobility Management Service............................................................. 18
4.2.4. Network Management Services ........................................................... 19
4.2.5. Accounting Services ............................................................................ 19
4.2.6. Authentication Services ....................................................................... 19
4.2.7. Encryption Services ............................................................................. 19
4.3. Logical: CDPD Protocols .................................................................................... 19
4.3.1. The Application Layer (Layer 7) ......................................................... 20
4.3.2. The Presentation Layer (Layer 6) ........................................................ 20
4.3.3. The Session Layer (Layer 5)................................................................ 20
4.3.4. The Transport Layer (Layer 4) ............................................................ 20
4.3.5. The Network Layer (Layer 3).............................................................. 20
4.3.6. The Data Link Layer (Layer 2)............................................................ 21
4.3.7. The Physical Layer (Layer 1) .............................................................. 21
4.3.8. Where CDPD Fits Into the Protocol Stack .......................................... 21
4.3.9. CDPD Communications Subprofiles ................................................... 21