HP 83206A User Manual page 282

Chapter 10, TIA/EIA-136 Basics
Basic Functions of the DCCH in TIA/EIA-136
Non-public System
Selection
282
S:\HP83206A\USRGUIDE\MANUAL\is136bas.fm
The procedure to update the SSD is listed below.
1. Base sends an SSD Update order containing the RANDSSD.
2. Mobile calculates a value SSD-A_NEW using RANDSSD, ESN, and the A-key.
3. Mobile generates a random number RANDBS and sends it to the base.
4. Mobile calculates AUTHBS using RANDBS and SSD-A_NEW.
5. Base calculates its own SSD-A_NEW.
6. Base calculates its own AUTHBS using RANDBS and SSD-A_NEW.
7. Base sends its AUTHBS to the mobile.
8. Mobile compares its AUTHBS with the one sent from the base.
9. If both AUTHBS values match, the SSD update is successful.
10. Mobile sends a confirmation to the base.
Data required to update SSD is listed below.
1. ESN
2. MIN1
3. RANDSSD: a 56-bit random number sent by the base
4. A-key: a 64-bit number permanently stored in the mobile
Private and residential systems can provide services using the TIA/EIA-136
standard. These systems are distinguished from public TIA/EIA-136 systems by
the network type and the system identification number.
The network types are Public, Private, and Residential.
Every system has an SID. In addition to SIDs, private and residential systems also
have Private System IDentifications (PSIDs). Residential systems also have
Residential System IDentifications (RSIDs).