CDM-750 Advanced High-Speed Trunking Modem
Revision 2
Front Panel Operation
MN-CDM750
5–18
On
the
top
line,
use
the
ST
arrow
keys
to
set
Flow
Control
as
Enabled
or
Disabled
,
and
then
press
ENTER
.
When
Flow
Control
is
Enabled
,
the
modem
will
begin
to
send
Pause
Frames
when
the
WAN
buffer
is
approximately
87%
full.
Pause
Frames
will
be
sent
to
ALL
Ports.
Pause
Frames
will
cease
to
be
sent
to
the
Ethernet
Interfaces
when
the
WAN
Buffer
Fill
Status
drops
below
75%
full.
If
ANY
device
directly
connected
to
the
Ethernet
ports
(
J5
|
DATA
,
J6
|
DATA
,
or
J7
|
OPTICAL
)
does
not
honor
Pause
Frames,
Flow
Control
should
be
set
to
Disabled
,
as
the
interconnected
device
will
not
back
‐
off
in
an
overflow
condition
and
may
cause
all
traffic
on
the
Tx
and
Rx
links
to
become
congested.
All
overflow
traffic
will
be
discarded.
Also
note
that,
when
the
Remote
Inband
is
set
to
Enabled
(see
Sect.
(CONFIG)
Remote
Control:
Inband
),
any
device
connected
to
the
management
port
(
J4
|
MGMT
)
must
also
honor
Pause
Frames
to
properly
ensure
system
operation.
(CONFIG: INTF) GBEX
Æ
Learning
MAC Learning: Disabled
Applies To All Ports
On
the
top
line,
use
the
ST
arrow
keys
to
set
Flow
Control
as
Enabled
or
Disabled
,
and
then
press
ENTER
.
Note
the
following:
•
With
MAC
Learning
set
as
Disabled
,
the
modem
passes
any
traffic
entering
from
the
GBEI
(LAN)
interface
to
the
satellite
(WAN)
side
of
the
link,
while
traffic
coming
in
from
the
satellite
(WAN)
side
of
the
link
is
passed
on
to
the
GBEI
(LAN)
interface.
There
is
no
filtering
of
traffic,
and
the
modem
connection
looks
like
a
“wire.”
•
With
MAC
Learning
set
as
Enabled
,
the
Destination
MAC
and
Source
MAC
are
“learned”
by
the
modem.
If
the
modem
sees
a
destination
MAC
on
its
LAN
side
that
it
recognizes
as
belonging
to
the
LAN
side,
it
will
not
transmit
the
frame.
If
the
modem
sees
a
destination
MAC
on
its
WAN
side
that
it
recognizes
as
belonging
to
the
WAN
side,
it
will
not
transmit
it
to
the
LAN
side.
If
the
modem
sees
a
Source
MAC
on
its
LAN
side,
it
learns
that
going
forward.
Any
Destination
MAC
it
does
NOT
know,
it
will
send
across
to
the
other
side.
The
MAC
Learning
process
is
further
explained
as
follows:
FRAME GOING FROM LAN TO WAN (Tx)
Source MAC
Destination MAC
Action
Don’t care
Unknown
Packet is sent to WAN, Source MAC is learned to exist on LAN
Don’t care
Known to exist on LAN side
Packet is NOT sent to WAN, Source MAC is learned to exist on LAN
Don’t care
Known to exist on WAN side Packet is sent to WAN, Source MAC is learned to exist on LAN
Don’t care
Broadcast or Multicast MAC
Packet is sent to WAN, Source MAC is learned to exist on LAN
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...
