Options parameters – Comtech EF Data MIDAS Version 4.X NMS Configuration User Manual
Page 54
MIDAS 4.X NMS Configuration, Rev.6
2–26
Setup and Operation
L
L
-
-
B
B
a
a
n
n
d
d
This is the center L-Band frequency of the Inbound Control channel, for the
burst-transmissions sent to the NMS from the various network elements. This
field allows the operator to define the L-band frequency on which the various
network elements will transmit to the NMS. Accordingly, the nodes’ Inbound
Center frequency (via the User Port) are set to this frequency to receive the
Outbound Control channel transmissions.
Acceptable values include: 950 to 1450 MHz (in accordance with the L-Band
Center and Transponder Size settings on the System Setup window), to
accommodate the operating frequency ranges of the full spectrum of satellite
transponders and Comtech EF Data hardware capabilities.
A
A
c
c
q
q
u
u
i
i
s
s
i
i
t
t
i
i
o
o
n
n
R
R
a
a
n
n
g
g
e
e
The Acquisition Range is a value (in kHz) that is used to provide additional
guard band for the bursting Inbound Control Channel. This value is used to
complement the operation of Automatic Frequency Control (AFC), and allows
nodes a wider sweep range when performing transmit acquisition by the nodes
in systems where satellite frequency translation error may exceed the limited
demodulator sweep range of the SNM-1001 Network Channel modem.
This value is stored in the database and used by the bandwidth manager task to
assign frequencies for traffic channels, with respect to the additional guard
band. This value is also sent to the nodes when they are commanded to become
“enabled”, where it is stored and then used by the Node Control modem to
limit the transmit sweep range when performing transmit acquisition. This
allows the node to have a controlled sweep range to compensate for excessive
frequency offsets in the network, while preventing interference with adjacent
carriers.
Note: For maximum bandwidth utilization and network performance, it is
recommended to set acquisition range to 0 kHz.
Options Parameters
S
S
t
t
a
a
t
t
u
u
s
s
P
P
o
o
l
l
l
l
I
I
n
n
t
t
e
e
r
r
v
v
a
a
l
l
This is a timing parameter (in seconds) that is used to detect if the node is
“alive”, or functioning properly. Status polls apply only to enabled, active
nodes. Every poll interval, the NMS will send a keep alive poll to the node. If
the node responds, then the node is “alive”. If there is no response from the
node after three consecutive polls, the node is marked inactive by the NMS.