Specifications

Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change 91
7.3 UMTS (WCDMA) / GSM specifications
Tabl e 7- 3 details the SL808X modem’s support for common UMTS (WCDMA) and
GSM specifications.
Unstructured supplementary
services data (USSD)
USSD provides support for transmitting information over the
GSM network signalling channels. It provides fast session-
based communication between the user and an application,
enabling use of text messaging, prepaid roaming, chat, etc.
(SL8080/82/84)
Supplementary services
Support for supplementary voice services such as Call Hold,
Call Forward, Call Waiting, Multi-party Calls, Caller ID, Fixed
Number Dialing, Service Dialing Numbers, etc.
Cell reselection/handover Supports InterRat and InterFrequency cell-reselection and
handover between supported frequency bands.
Security - IMEI Security
SIM lock The device can be ‘MEP locked’ to a particular PLMN.
SIM security Both CHV1 and CHV2 are supported (unlock and unblock).
Table 7-2: Supported GSM / GPRS specifications (Continued)
Item Comments
Table 7-3: UMTS (WCDMA)/GSM specifications
a
Item GSM UMTS
Mobility management
Automatic PLMN selection / reselection  
Location updating procedure  
IMSI attach procedure  
IMSI detach procedure  
Periodic location update  
Authentication procedure  
CM connection establishment from MS or network  
CM connection release  
Encryption key management  
TMSI reallocation  
Paging response  
Abort procedure  
Identification  
CN system information  
Call re-establishment  