Transas T214, Technical Manual

Page: 74 / 115

Settings of Base Station configuration
TRANSAS AIS BASE STATION T214. Technical Manual.
72
Owner – Ownership for reservation. This field identifies the ownership of the
reservation. Possible values are as follows:
L = Local ownership. The Base Station receiving this sentence owns and may
utilize these FATDMA slots. The Base Station shall broadcast these FATDMA
slot reservations.
R = Remote ownership. A remote Base Station owns and may use these
FATDMA slots. The local Base Station shall broadcast these FATDMA slot
reservations.
C = Clear the reservation. This instructs the Base Station receiving this
sentence to clear this reservation from its frame map. If this field is set to “C”,
than the following four fields shall be set to null, and will be ignored if set
otherwise.
A Base Station can broadcast slot reservations for another station. The Base
Station is not allowed to use the slots reserved for stations other than itself.
These are the remote (R) stations. It is allowed to broadcast on its own local (L)
slots. Final slot selection is a process internal to the Base Station. The ownership
should be subject to be overruled by sentence TBD 2 Rational: Utilise a slot pool
used by several Base Stations.
Base – Start slot for reservation. Starting slot ranging from 0 to 2249. A null field
indicates no change to the staring slot for this FATDMA reservation. When received
from a Base Station, a null field indicates that the start slot has not been set, i.e. is
unavailable, when the DLM sentence is received from the AIS equipment.
Increment – Increment for reservation. Slot increment ranging from 30 to 1125 in
slots or 0. A value of 0 indicates only one broadcast is scheduled in the frame. A null
field indicates no change to the current slot increment setting when sent to the AIS
equipment, and indicates that the slot increment has not been set, i.e. is unavailable,
when the DLM sentence is received from the AIS equipment. When the increment is
not “0” the following formula should apply:
2250 mod Increment = 0
NSlots – Number of slots for reservation. The number ranging from 1 to 5 of
Consecutive Slots reserved for FATDMA broadcasts.
Timeout – Time out for reservation. The Time out in minutes ranging from 0 to 7 for
the Slots reserved for FATDMA broadcasts. A null field indicates no change to the
number of consecutive slots reserved when sent to the AIS equipment, and