ASTi Telestra User's Guide download pdf (Page 126)

ASTi Telestra User Guide (Ver. 2, Rev. L.1)

Optional Conﬁguration Commands

The following commands allow the user to customize the terrain interface on the DACS but are

not required.

terrain:pdus_packet = x

This command speciﬁes the number of PDUs to be sent per UDP packet. The valid range of

values is from 1 to 16. This effectively sets the maximum number of path loss information

requests per packet. If more PDUs are ready in a frame than the number set, PDUs will be dis-

tributed in subsequent packets. If the number of PDUs ready in a frame is less than the value

set, then all PDUs will be sent.

terrain:rate_divider = xx

This commands sets the maximum rate at which packets are transmitted to the Terrain Server.

The rate of packet transmission is the master (also called system) model rate divided by xx. If

xx = 10, one packet is sent every 10 model frames. See the Model Builder Reference Manual

section on the Model Timing window for an explanation of the master model rate.

terrain:pathloss = Off|LOS|OTH|All

This statement controls the conditions under which Model Builder will apply its own internal

loss calculation to the received power of a radio. For “Line-Of-Sight” radios, Model Builder

computes free-space loss, fresnel diffraction effects, and occulting by the smooth ellipsoidal

(WGS-84) earth for in-tune transmitter/receiver pairs. This ﬂag controls whether an internally-

computed loss is applied to a given type of radio.

For example, if this is set to “Off”, Model Builder does not apply any internally-computed

losses to any radios. If this ﬂag is set to “LOS”, then internally computed losses are applied to

“Line-Of-Sight” radios only. If this ﬂag is set to “OTH”, then internally computed losses are

applied to “Over-The-Horizon” radios only. If this ﬂag is set to “All”, then internally com-

puted losses are applied to both “Line-Of-Sight” and “Over-The-Horizon” radios.

If using the Terrain Server and the HF Server, the recommended setting for this parameter is

“OTH” since the HF Server computes values for transmission loss using its own algorithm

which includes free-space loss. If using the Terrain Server by itself, this parameter should

match the “terrain:request” parameter described above.

See the Model Builder Reference Manual (DOC-01-MB-RM-4) Revision A (July 2004) for com-

plete DACS conﬁguration commands.

Model Builder Radio Conﬁguration

The only requirement for the radio models is that they must be set to a frequency greater than 33

MHz.

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ASTi Telestra User's Guide Page 126