L3 Communications MPM-1000A Operator's Manual page 95

MPM-1000A Operator Manual
different beams, then the fully fanned-out group of bandwidth segments from
their respective beams must also be fanned-in such that on the downlink they
arrive in a common bandwidth segment within each beam. This fully fanned-
in/fanned-out group of bandwidth segments allows for the following
simplifications with NCW burst scheduling:
a) This ensures a Loopback bandwidth segment (i.e. same uplink and
downlink beam) for all NC-Capable terminals to support Reference FOW
(RFOW) loopback.
b) This ensures that each NC-Capable terminal, regardless of operating
beam, can broadcast the RFOW to all other terminals in the network
without burst replication and that the RFOW arrives at the same frequency
in the downlink beam regardless of the source.
c) This ensures that all NC-Capable terminals, regardless of their operating
beam, can support AROW burst monitoring without the need for network
member (NM) transmit AROW burst replication.
d) This allows broadcast and multi-cast DCOM data to be transmitted to
destinations in multiple beams without the need for transmit burst
replication (i.e. broadcast/multi-cast data is restricted to the fully fanned-
out group of bandwidth segments).
e) This significantly simplifies the bandwidth segment selection processing
for broadcast and multi-cast DCOM data.
3) In addition to the fully fanned-out group of bandwidth segments for each
beam, other non-fanned-out bandwidth segments can be established to
provide additional PTP connectivity within a single beam or PTP connectivity
between beams.
The NCW resource scheduler will not support the following WGS Channelized
configurations and/or associated terminal and beam scenarios:
a. Terminals that are operating on more than one beam. Although the satellite can
be configured with overlapping beam coverage areas, a terminal must be
configured for operation in a single beam. This eliminates issues having to do
with the receive duplication of broadcast and multi-cast data.
b. Terminal TX/RX front-end RF tuning ranges that do not cover the entire
uplink/downlink spectrum associated with all bandwidth segments in the
terminal‟s beam. This eliminates the complexities associated with resource
scheduling when terminals cannot tune to bandwidth segments within their
operating beam. This is not a significant compromise since the Agile-Tuned
Modem will be able to tune over a contiguous bandwidth of at least 500 MHz.
c. Multiple beam configurations without the fan-out and fan-in bandwidth segment
stipulations cited above.
The NCW resource scheduler also supports bandwidth segments that have different
gain characteristics or gain states and preferences for using these segments. In order to
facilitate assignment of communication links to preferred satellite bandwidth segments
(i.e. preferred gain states), each bandwidth segment has a range of source terminal
EIRP and a range of destination terminal G/T. For all burst types except the RFOW, the
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