OTE PUMA T2 - Short Data Services

PUMA T2
Technical Handbook
General information
P/N: 779-0306/01
Revision 03
OTE Proprietary information
Page 17
scheme for Group Numbers defined in TMO. The air interface supports more
than one group on a DM RF carrier although only one group is able to
communicate using the channel at any given time. Only one number (Group
Number-GTSI) is sent on the air interface and no acknowledgement is
expected.
• Operating mode: The operating mode is Simplex.
• ID number: The Talking Party Identification is supported but only using the ID
number: the alias string is not transferred on the DM air interface. When the
ID number is contained in the radio unit local agenda the alias string is
displayed.
• Late Entry: Late Entry allows a radio when it accesses an active DM RF
carrier to enter an ongoing call if that call is addressed to a group of which it is
a member. A radio unit may access a DM RF carrier in a number of ways, for
example:
- the user switches on the radio unit and selects that RF carrier
- the user switches from another DM RF carrier to that RF carrier
- the radio unit returns to DM coverage after a period of lost coverage
The user switches the radio unit from V+D mode to DM and selects that RF
carrier.
1.8.2 Short Data Services
Short Data Services is a feature that enables a user to transfer a limited amount of
data to an individual or group identifier over the control channel. Short Data
Services are classified as:
• pre-defined (Status Messages) or
• user-defined (Short Data Messages)
Status Messages are pre-defined bit configurations known to both users and the
system.
Both Status Messages and Short Data Messages can be sent to or by users
already involved in speech or circuit data calls (individual or group calls).