NOTICE: To restore a radio that is disabled using the permanent disable v2, see TETRA
Terminals CPS Start-up User Guide (Motorola Solutions Part Number: 6802974C10).
2.11.6
High Assurance Boot
The radio has a facility that ensures that the code and data flashed in the radio is authentic and has not
been altered.
The hardware forces the High Assurance Boot (HAB) module to run at boot time. The module checks if
all software comes from a trusted source. The radio is checking the signature of the code and data
segments present in the radio using a public/private key mechanism.
If the HAB authentication of the flashed software fails, it does not allow the radio software to run.
2.12
Packet Data
In Trunked Mode Operation (TMO), the radio provides a TETRA bearer service for applications that
use the IP protocol. This service is available to external applications by connecting using the PEI.
The radio operates on the single-slot packet data channel.
Packet data applications reside internally, over UDP, or in an externally connected device, connected
using a USB cable port in the radio.
Communication to external radio is initialized using AT commands. Once connection is established, the
external application requests and operates in Point-to-Point Protocol (PPP) mode until data connection
terminates.
The system provides Point-to-Point IP connectivity allowing the following datagram exchanges.
• Radio ←→ External Equipment (Terminal Equipment) (for example PC).
• External Equipment (Terminal Equipment) ←→ Network (through radio).
The radio supports only IP version 4 packets. The radio routes datagrams independently of the
protocol sitting on top of IP.
The radio supports an MTU of 1500 bytes.
The radio provides a best effort delivery service. If the delivery fails due to the radio environment, the
radio generates ICMP messages addressed to the Terminal Equipment. Delivery may fail due to the
following reasons:
• no radio coverage.
• failed transmission.
• service interaction.
The packet data service Packet Data Channel (PDCH) access signaling has the same priority as a
circuit mode setup-related signaling. The radio uses advanced link for packet data transmission and
supports advanced link flow control. If the link does not disconnect between cells, advanced link
roaming is supported.
The radio does not support data compression. Application attempts to negotiate data compression
during context activation is rejected. If the SwMI sends a data compressed IP packet, it is silently
discarded. The radio supports IP header compression negotiation received from Terminal Equipment
during Packet Data Protocol (PDP) context activation and transparently transfers IP packets with the
header compression between Terminal Equipment and the SwMI.
The packet data service employs the TETRA standard cell selection and re-selection. The packet data
service suspends while the re-selection is occurring, and resumes when the cell re-selection procedure
completes.
MN002955A01-AA
Chapter 2: Services and Features
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