M3SR Series 4100 IP over Air (IPoA)
5.38 Operating Manual 6175.4760.02 – 01
• Reduced receive window size
A reduced receive window discourages the sender from sending huge packet bursts
congesting the network. Recommended values are between 4 to 16 x MSS (Maximum
Segment Size), typically 8 x MSS = 3766.
All hosts (endpoints terminating the transport protocol) involved need their settings
to be adapted.
5.3.1.3 Special IP Services
The IPoA protocol provides support for several predefined IP services running on the radio,
such as
• Text Message Service
• Alarm Service
• GPS Service and
• GPS Immediate Service.
Each of these services can be enabled / disabled in the mission configuration using
R&S RNMS3000 (Radio Network Management System) and has a send priority and an IP
mapping (protocol / port) assigned as listed in Table 5.4.
Table 5.4 Priority, IP Mapping (Protocol / Port) and ARQ
The send priority order defines the priority among the services, i.e. alarm messages are al-
ways sent before all other services. IP data passed to the IPoA protocol for transmission is
mapped to the services according to their IP mapping configuration, e.g. a UDP packet with
Service Send prior-
ity order
Protocol Port Enabled ARQ FastLink
assigned
FastLink Control 1
st
UDP 35008 no off off
Text Message 4
th
UDP 35002 no off off
Alarm Message 2
nd
UDP 35000 no off off
GPS 5
th
UDP 35004 no off off
GPS Immediate 3
rd
UDP 35006 no off off
Transparent IP 6
th
ANY ANY yes off off
User1 6
th
TCP ANY yes on off
User2 7
th
ANY 35010 no off on
User3 8
th
UDP 35012 no off off
User4 8
th
UDP 35014 no off off
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