Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
56
Configuration
Path
[Physical
Interface]
‐
[Interface
Configuration
(WAN
‐
n)],
n=1,
2
Interface
Name
WAN
‐
1
WAN
‐
2
Physical
Interface
ADSL
USB
3G/4G
Operation
Mode
Always
on
Failover
WAN
‐
1
□
Seamless
Line
Speed
2Mbps
/
22Mbps
5Mbps
/
21Mbps
Configuration
Path
[Internet
Setup]
‐
[Internet
Connection
Configuration
(WAN
‐
n)],
n=1,
2
Interface
Name
WAN
‐
1
WAN
‐
2
WAN
Type
Ethernet
over
ATM
with
NAT
3G/4G
Configuration
Path
[Internet
Setup]
‐
[Ethernet
over
ATM
with
NAT
WAN
Type
Configuration]
Interface
Name
WAN
‐
1
Connection
Control
Auto
‐
reconnect
(Always
on)
Data
Encryption
LLC
VPI
Number
0
VCI
Number
33
Schedule
Type
UBR
Configuration
Path
[Internet
Setup]
‐
[3G/4G
WAN
Type
Configuration]
Interface
Name
WAN
‐
2
Dial
‐
up
Profile
Auto
‐
detection
Connection
Control
Auto
‐
reconnect
(Always
on)
So,
the
initial
status
of
two
WAN
connections
is
shown
in
following
diagram.
Cellular
Network
WAN
‐
1:
ADSL
ISP
DSLAM
Gateway
WAN
‐
2:
3G/4G
Connected
Initial Status
Not Connected
Next,
Failover
and
Failback
processes
are
shown
in
following
diagram.
Their
steps
are:
S
1:
When
system
discovers
the
primary
WAN
connection
is
failed.
S
2:
System
starts
the
failover
process.
S
3:
System
tries
to
create
the
WAN
connection
by
using
Failover
WAN
interface,
and
use
it
for
incoming
data
transmitting
mission.
S
4:
System
keeps
trying
to
recover
the
failed
primary
WAN
connection.
Once
it
is
recovered,
