Carrier power, Traffic channels – Comtech EF Data MIDAS 4 System and Design User Manual
Page 48
System and Design Manual, Revision 2
3–6
Theory of Operation
C
C
a
a
r
r
r
r
i
i
e
e
r
r
P
P
o
o
w
w
e
e
r
r
MIDAS handles different antenna sizes, carrier levels, and data rates. The
MIDAS operator enters the carrier transmit power level for all the pre-defined
circuits.
• If Circuit Power Management feature of LinkSync™ is enabled, the
transmit power level for traffic node initiated circuits is calculated
dynamically by the MIDAS Controller and sent to the traffic nodes as
part of the circuit assignment message.
• If Circuit Power Management is not enabled, default power level
settings are used for traffic node initiated circuits.
T
T
r
r
a
a
f
f
f
f
i
i
c
c
C
C
h
h
a
a
n
n
n
n
e
e
l
l
s
s
All the owned bandwidth (on a transponder, except those reserved for the
control channels) can be allocated for user traffic. The traffic channels operate
in an FDMA/SCPC mode. The MIDAS Controller allocates them in pairs for
point-to-point full duplex circuits and individually for point-to-point and
point-to-multipoint simplex circuits.
For full duplex circuits, the channel pair can be allocated anywhere in the
customer’s transponder allocation and need not be adjacent. MIDAS allows
for symmetric circuits where the two traffic channels have the same
characteristics (data rate, modulation and encoding), and asymmetric circuits
where the two traffic channels have different characteristics (data rate,
modulation and/or encoding).