Service Manual

Interface Description EMIII-DUAL Servce Manual Application
Information
EMIII-DUAL V1.0 AnyDATA.NET Proprietary – Use Subject to
Restrictions
The EMIII-DUAL functions digital cellular module worked in CDMA (Code Division Multiple
Access) mode. CDMA type digital mode applies DSSS (Direct Sequence Spread Spectrum) mode ,
which is used in military.
This feature enables the phone to keep communication from being crossed and use one frequency
channel by multiple users in the same specific area, resulting that it increases the capacity 10 times
more compared with that in the analog mode currently used.
Soft/Softer Handoff, Hard Handoff, and Dynamic RF power Control technologies are combined into
this phone to reduce the call being interrupted in a middle of talking over phone.
CDMA digital cellular network consists of MSC (Mobile Switching Office), BSC (Base Station
Controller), BTS (Base station Transmission System), and MS (Mobile Station). Communication
between MS and BTS is designed to meet the specification of IS-95A (Common Air Interface). MS
meets the specifications of the below :
- IS-95A/B/C ( Common Air Interface ) : Protocol between MS and BTS
- IS-96A ( Vocoder ) : Voice signal coding
- IS-98 : Basic MS functions
- IS-126 : Voice loopback
- IS-99 : Short Message Service, Async Data Service, and G3 Fax Service
EMIII-DUAL is digital mode is designed to be operated in full duplex.
General Introduction