UHP NETWORKS SCPC - COTM Working Principles; Figure 41 Configuration and Permission Using SNMP for COTM

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UHP SCPC MODEM

USER MANUAL, v3.2

Figure 41 Configuration and permission using SNMP for COTM

If parameter Access IP 1 is set to 255.255.255.255 value then UHP router is accessible by SNMP protocol from all

network devices.

When Beam Switching uses OpenAMIP protocol, UHP router sends to the mobile antenna controller the respective

commands to point to the required satellite. The structure of these OpenAMIP commands is the following:

S <Sat longitude> <Latitude variance> <Polarization offset>

P <RX pol> <TX pol>

H <Frequency, MHz> <Bandwidth, MHz>

B <RX lo freq, MHz> <TX lo freq, MHz>

The commands will be sent once and UHP router will not check if these commands have been properly received

and accepted by the mobile antenna controller. After that UHP will wait during the defined Timeout (see Figure 41)

until the antenna points to the defined satellite. During this period of time UHP router will not change its profiles

and will not send further SPHBF commands to the mobile antenna controller.

While working in the COTM mode UHP router receives the current geographical coordinates from the mobile

antenna controller and activates its modulator under the management of the controller. COTM-enabled UHP

routers have special status COTM / AMIP meaning that the router establishes a connection to the controller of the

antenna system and receives the current coordinates.

Special console command: debug ot on allows monitoring the sequence of OpenAMIP commands exchanged

between UHP router and the mobile antenna controller.

6.5 COTM working principles

When Beam Switching is enabled (Advanced -> Network -> COTM / AMIP) UHP router receives actual coordinates

and selects the most appropriate Network with maximal EIRP. Afterwards it executes one of the following

scenarios:

• If the selected Network is configured with profile ‘0’, UHP router changes frequency and symbol rate

setting as well as the latitude of the satellite within the active profile to the values preconfigured for the

selected network. Thereafter the profile is restarted.

• If the selected Network is configured with profile ‘1’-‘8’ UHP router activates the respective configuration

profile without any changes.

Next, the router commands the mobile antenna controller using OpenAMIP or SNMP protocols to point to the

selected satellite. UHP router calculates respective DTTS value and tries to lock the carrier and login to the

network.

Current geographical location of UHP router can be checked using show network console command or via HTTP

interface Advanced –> Network –> Overview.