CDM-750 Advanced High-Speed Trunking Modem
Revision 2
Appendix C
MN-CDM750
C–18
C.6
Monitoring ACM Performance and Statistics
•
Chapter
3.
REAR
PANEL
CONNECTORS
•
Chapter
5.
FRONT
PANEL
OPERATION
•
Chapter
6.
ETHERNET
‐
BASED
REMOTE
PRODUCT
MANAGEMENT
•
Chapter
7.
SERIAL
‐
BASED
REMOTE
PRODUCT
MANAGEMENT
The
CDM
‐
750
provides
a
number
of
ways
to
monitor
the
ACM
system:
•
Via
the
CDM
‐
750
Front
Panel:
Use
the
MONITOR:
ACM
front
panel
menu
to
view
the
current
Tx
and
Rx
ModCod
,
as
well
as
the
Local
and
Remote
Es/No.
The
Es/No
displays
values
between
–3.0
dB
and
+23.0
dB,
with
a
resolution
of
0.1
dB.
If
either
the
local
or
remote
demodulator
is
unlocked,
the
Es/No
will
display
‘
No
Sync
’.
Note
that
you
may
often
see
that
the
RX
ModCod
is
“00”.
This
is
normal
when
there
is
no
real
data
being
received.
DVB
‐
S2
states
that
when
no
data
is
available,
the
modulator
should
insert
a
Dummy
PLFRAME.
These
Dummy
PLFRAMEs
are
used
to
keep
the
demod
locked,
but
contain
no
user
data
and
have
a
ModCod
value
of
“00”.
If
you
wish
to
see
the
exact
detail
of
the
ModCod
(data
rate,
modulation,
code
rate),
view
these
parameters
using
the
INFO:
TX
or
INFO:
RX
screens.
Furthermore,
if
using
the
CONFIG:
TX
or
CONFIG:
RX
menus,
both
the
symbol
rate
and
data
rate
are
displayed.
All
of
these
screens
update
dynamically
–
if
a
ModCod
changes,
the
parameters
are
refreshed
on
these
displays.
•
Via
the
CDM
‐
750
Remote
Control
and
Ethernet
Management
Interfaces:
As
described
for
the
CDM
‐
750
Front
Panel,
this
information
is
available
via
remote
queries
issued
over
the
Remote
Control
Interface
(Serial
or
Telnet),
and
by
using
the
Ethernet
Remote
Product
Management
Interfaces
–
SNMP,
or
the
CDM
‐
750
Web
Server
interface
via
the
Status
|
Status
and
Status
|
ACM
pages.
•
Via
Oscilloscope:
If
you
have
access
to
an
Oscilloscope
in
X
‐
Y
mode,
Pins
#3
and
#11
on
the
CDM
‐
750
rear
panel
J1
|
ALARMS
connector
provide
analog
voltages
to
monitor
the
constellation.
The
advantage
here
is
that
ModCod
changes
may
be
viewed
instantaneously.
•
Via
Internal
BERT
Tester:
When
using
the
Ethernet
IP
interface,
it
is
not
an
easy
matter
to
verify
BER
performance.
A
way
to
verify
that
the
ACM
link
is
meeting
performance
is
by
using
the
internal
BERT
tester.
Not
only
will
the
internal
BERT
verify
BER
performance,
it
is
also
tolerant
of
the
change
in
bit
rate
that
accompanies
a
change
in
ModCod.
The
BERT
can
be
used
to
confirm
that
there
are
no
sync
losses
or
bursts
of
bit
errors
when
a
ModCod
changes.
Summary of Contents for CDM-750
Page 76: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Updating Firmware MN CDM750 4 12 Notes...
Page 224: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix A MN CDM750 A 4 Notes...
Page 234: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix B MN CDM750 B 10 Notes...
Page 256: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix C MN CDM750 C 22 Notes...
Page 280: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix D MN CDM750 D 24 Notes...
Page 300: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...
