2-28 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
The MS will discard received packets when its buffer is full and the system is expected to retransmit
these discarded packets.
Advanced Link Roaming, when the Advanced Link is not disconnected between cells, is supported
by the terminal.
8.10 IP Compression
The terminals do not support data compression and if an application attempts to negotiate data
compression during connection to the terminal and set up, it will be rejected. If a compressed data
IP packet is received from the system it will be ‘silently’ discarded.
The terminal does support IP header compression negotiation by an application during connection
to the terminal and set up and will transparently transfer IP packets with header compression
between the application and system.
8.11 Roaming of Terminals
The packet data service employs the TETRA standard cell selection and re-selection, i.e.
“undeclared” both when the terminal is not involved in packet data transfers and when the terminal
is on the PDCH. The packet data service is suspended (in “break” state) while the reselection is
occurring, and resumes when the cell reelection procedure is complete.
Note: The cell re-selection is “undeclared” in a strict TETRA sense. However, the SNDCP protocol
defines a procedure for reconnecting the packet data service on the new cell. In this sense, the cell
re-selection procedure resembles the “unannounced” cell re-selection procedure.
8.12 PD User Authentication
PD User authentication is a method of authenticating the TE2 user before allowing activation of the
packet data link. The actual authentication is preformed by an authentication center connected to
the SwMI. The terminal only relays the messages between the TE2 and the SwMI.
In “wide mode”, the terminal will offer PPP user authentication between MT2 and TE2 using PAP or
CHAP (as described in [Ref 22]) before the IP link is established. The terminal will always attempt to
negotiate usage of the CHAP method, but will agree to PAP if the TE2 application insists. If the
terminal is provisioned to not require PD user authentication, it will operate without any user
authentication if the TE2 application refuses to accept CHAP or PAP. However, if the terminal is
provisioned to require PD user authentication, it will reject the PDP context activation.
Note: If the SwMI does not agree to the authentication method (e.g.: PAP), the SwMI can reject it.
8.13 Voice + Data Service and Feature Interaction
8.13.1 Voice Service Interaction
During voice priority mode, a voice service will cause the terminal to move to a traffic channel. The
MS will terminate all active packet data transmission and reception and suspend the packet data
service. The packet data service will be resumed on the completion of the voice service.
8.13.2 SDS Interaction
A terminal will accept any downlink SDS message received on the PDCH.
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