P300H
P300 Series Modem Installation and Operating Handbook
Page 159
also
end
ach
igh) that
the AUPC can achieve this update rate using less than 33% of the ESC channel bandwidth, then
33% bandwidth is
M&
If th
AUP
o reporting rate as
et to RS232 or RS422, AUPC cannot be used.
The Eb
of the
ײ
8.11.2
DO NOT switch on the AUPC immediately, it is much simpler to get the circuit working first, determine
Configure t
correctly. S
stant Eb/No expected under clear sky conditions.
For IBS/SMS and IDR carriers the ESC can be switched on later within the overhead without
For Clo
Adding
the Eb/
used fo
Configure an ESC channel for 8 bits no parity, Baud rate as described below.
or
will give
For Clo
(as this
exceedi
ead over 10%.
The ESC channel for the AUPC must have symmetrical Baud rates.
C interface:
the AUPC will use 100% of the ESC channel capacity at
rt to the ESC channel) it is
not required
to have the ESC channel at the same
For example the station M&C could be running at 9600 Baud, and the ESC channel
PC software will buffer and rate convert the M&C
If the ESC interface is set to
Ô·²µ ¬± ÓúÝ
(
Ô·²µóÔ
or
Ô·²µóÎ
) then it assumes the ESC channel is
being used for network M&C (as this is the setting used to provide the connectivity for distant
M&C). In this case the AUPC will use up to 33% of the ESC channel bandwidth in order to
ieve an Eb/No reporting rate of once per second. If the ESC Baud rate is such (ie so h
it uses only the proportion of bandwidth required for a 1Hz update rate. The
used by interleaving the requests for the distant Eb/No and distant end Eb/No responses between
C messages using the ESC channel.
e ESC interface is set to RS485, then the external RS485 interface will be disabled and the
C will use 100% of the ESC channel bandwidth to achieve as high an Eb/N
possible.
If the ESC interface is s
/No update rate and percentage of ESC channel bandwidth used is displayed on one screen
º±ô Ê·»© ݱ²º·¹ô ÌÈ
sequence of screen displays.
Configuring AUPC for operation
the normal levels, AND THEN activate the AUPC.
he modems at both ends of the link and ensure the basic satellite link is operating
et the Tx power to achieve the di
changing the carrier power or bandwidth.
sed Net Plus ESC carriers, the overhead is added
as required
for the ESC channel.
an ESC channel later will change the bandwidth of the signal and may slightly affect
No. In this case configure the ESC at least to a nominal Baud rate. If the ESC is not
r any other M&C purposes then 300 Baud may be sufficient for AUPC alone.
F IBS/SMS and IDR configure as higher rate ESC channel as the modem can provide. This
the fastest possible reporting rate.
sed Net Plus ESC our suggestion would be to include the optional Backward Alarm
is a very useful feature), and set the Baud rates as high as possible without either
ng the allotted satellite bandwidth or using an overh
Set the ES
If the ESC channel is to be used for AUPC only, set the ESC interface to
ÎÍìèë
. The external
RS485 port will be disabled and
whatever Baud rate you have defined the ESC channel.
If the ESC channel is to be used for AUPC
and
distant end remote M&C, set the ESC
interface to either Link-Local or Link-Remote (Local at the controlling PC end, remote at the
end farthest away from the PC).
Note
:
This is contrary to expectations!
When using AUPC with either Link-Local and
Link-Remote selected as the ESC interface (to internally connect the Remote M&C
po
Baud rate as the M&C system.
set for 2400 Baud. The AU
