Voice And Data Support; Table 6: Voice-Data Interaction Modes - Motorola MTP850 S Product Information Manual

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 the best effort delivery service. However, if the delivery fails, the originating user application is
informed by sending back to Terminal Equipment an ICMP message, if possible.
The radio generates ICMP messages addressed to the Terminal Equipment in case of failed delivery due to the radio
environment. The delivery may fail due to, for example:
• no radio coverage.
• failed transmission.
• service interaction.
The packet data service PDCH access signaling has the same priority as circuit mode setup-related signaling. The
radio uses advanced link for PD transmission and supports advanced link flow control. The advanced link roaming, if
the advanced link is not disconnected between cells, is supported, where the SwMI supports it.
The radio does not support data compression. If an application attempts to negotiate data compression during context
activation, it is rejected. If a data compressed IP packet is received from the SwMI, it is silently discarded. The radio
supports IP header compression negotiation received from Terminal Equipment during 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 is
suspended while the reselection is occurring, and resumes when the cell reselection procedure is complete.
Note: The cell reselection 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 reselection
procedure resembles the unannounced cell re-selection procedure.
Multi-slot packet data is a selling feature.

Voice and Data Support

The radio can alternate voice and packet data service. However, voice and data running in parallel are not supported.
This behavior corresponds to Packet Data Type B - IP dual mode.
If the SwMI rejects the context activation due to PD MS type not supported, the radio reinitiates context activation
indicating that supports Type C. It is done to accommodate legacy SwMIs that uses an older definition of these types.
The radio supports transmitting and receiving SDS on the packet data channel. Thus, these services may be conducted
in parallel.
The radio can operate in one of the voice-data interaction modes.

Table 6: Voice-Data Interaction Modes

Voice-Data Interaction Mode
Voice Only Mode
Data Only Mode
Description
You have the option to select Voice Only mode, in
which Packet Data service is disabled. If an external ap-
plication attempts to start up in this mode, packet data
registration for a wide link is rejected. If the packet data
service is active when this mode is selected, the radio de-
activates packet data. The PEI operates in the local mode
only (data transfer between TE and MT).
You have the option to select Data only mode, in which
normal voice calls are not permitted. Incoming non-
emergency voice calls are rejected, and you cannot ini-
tiate non-emergency voice calls. Incoming and outgoing
emergency calls are allowed.
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Services and Features | 49
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