2-6 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
2 Group Call (TMO)
The group call is defined, in the TETRA Standard, as the normal operating mode and is a point to
multi-point operation. The terminals involved are only able to use half duplex call procedure which
means the user has to press and hold the Push-to-Talk Button during transmitting.
PEI Peripheral Equipment Interface
PPC Pre-Emptive Priority Call
PPP Point to Point Protocol
PSTN Public Switched Telephone Network
PTT Push-To-Talk
PUK PIN Unblocking Key
RF SA Radio Frequency Sensitive Area
RFC Request For Comment (Internet ’standard’)
SCK Static Cipher Key
SCKN SCK Number
SCVK-VN SCK Version Number
SDMO Secure DMO
SDS Short Data Service (this includes SDS-Status, and SDS user-
defined-data 1,2,3 and 4)
SDTS Short Data Transport Service
SFD Service and Feature Description
SMS Short Message Service
SNDCP Sub-Network Dependent Protocol
SS Supplementary Service
SwMI Switching and Management Infrastructure
TE2 Terminal Equipment Type 2 (Connected via serial link to MT2)
TEA TETRA Encryption Algorithm
TEI TETRA Equipment Identity
TETRA TErrestrial Trunked RAdio
TNP1 TETRA Network Protocol 1, radio control protocol on the PEI
TIP TETRA Interoperability Profile (an agreement between TETRA
manufacturers that specifies TETRA signaling options to be
used)
TXI Transmit Inhibit
UDP User Datagram Protocol
USSI Un-exchanged Short Subscriber Identity
(V)ASSI (Visitor) Alias Short Subscriber Alias Identity
GSSI Group Short Subscriber Identity
VGSSI Visitor GSSI
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