User's Manual

Doc. No.
Rev.
Date
DRAFT
1.01
2012-01-27
Damm Cellular Systems A/S, Denmark
TetraFlex
®
7.5 Manual - Packet Data Gateway
TetraFlex® 7.5 Manual 2-115
2.12 PACKET DATA GATEWAY
The Packet Data Gateway can be used as a Gateway between two networks; in this case
Subnet 2 connected to the Wan and another network Subnet 1 connected to a MS device.
MSPC
Serial PEI
SwMI
PC
Wan
Subnet 1 Subnet 2
The TetraFlex
®
System supports dynamic multi slot packet mode where Packet Data
gateway/servers can be activated at any node supporting standard IP communication
between TETRA Mobiles and attached units like laptops, application servers, workstations,
FTP servers, WAP servers, etc. anywhere within the IP network/Internet.
Fixed IP addresses are allocated for the mobiles in the subscriber register allowing direct
access to mobiles from different applications. Computers connected to the mobile have to be
set to DHCP and automatically the system will provide them with an IP address, mask, DNS
server, etc. The DNS server address is configured in the profile for the mobiles allowing
mobiles to use their company DNS Server.
By default the TetraFlex
®
Packet Data gateway automatically announces itself to the
connected IP segment with the RIPv2 protocol. The main router/default IP gateway therefore
has to have RIPv2 activated as it ensures automatic rerouting to the redundant BSC when it
takes over.
It is possible to set up two redundant PD gateways/servers in the mobiles profile. Note that
the access to a packed data gateway is not needed for making IP communication between
two mobiles as mobile to mobile packet data service always will be available.
The TetraFlex
®
System has full support for multi slot PD giving an approximate throughputs
from 3.5 to 14 Kbit/sec depending on the number of slots used. If possible the system will
automatically assign 4 data slots at startup and then preempt data slots when necessary to
assign slots for speech. Each data slot can be shared by two users making it possible to have
a maximum of 8 packet data sessions running simultaneous. In case slots assigned for
speech is available the packet data gateway will monitor timeslots every 5 seconds and
reassign these for data transfer.
2.12.1 PD GW configuration