Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
50
Chapter
3
Basic
Network
3.1
WAN
The
gateway
provides
one
or
more
WAN
interfaces
to
let
all
client
hosts
in
Intranet
of
the
gateway
access
the
Internet
via
ISP.
But
ISPs
in
the
world
apply
various
connection
protocols
to
let
gateways
or
user's
devices
dial
in
ISPs
and
then
link
to
the
Internet
via
different
kinds
of
transmit
media.
So,
the
WAN
Connection
lets
you
specify
the
WAN
Physical
Interface,
WAN
Internet
Setup
and
WAN
Load
Balance
for
Intranet
to
access
Internet.
For
each
WAN
interface,
you
must
specify
its
physical
interface
first
and
then
its
Internet
setup
to
connect
to
ISP.
If
the
gateway
has
multiple
WAN
interfaces,
you
also
can
assign
physical
interface
to
participate
in
the
Load
Balance
function.
In
Physical
Interface,
you
can
choose
“Ethernet”,
“3G/4G”,
“USB
3G/4G”
or
“ADSL”
based
on
the
supported
interfaces
of
the
gateway.
In
Internet
Setup,
you
can
choose
adequate
WAN
type
for
different
kind
of
WAN
interface.
When
the
gateway
has
multiple
WAN
interfaces,
load
balance
function
operates
between
these
interfaces
to
maximize
the
WAN
bandwidth
utilization.
