<s>
The	O
Smart-UPS	B-Application
is	O
a	O
series	O
of	O
enterprise-level	O
uninterruptible	O
power	O
supplies	O
(	O
UPS	O
)	O
made	O
by	O
American	O
Power	O
Conversion	O
(	O
APC	O
)	O
.	O
</s>
<s>
With	O
the	O
exception	O
of	O
RT	O
and	O
SRT	O
series	O
,	O
Smart-UPS	B-Application
units	O
are	O
line-interactive	O
UPS	O
systems	O
,	O
only	O
running	O
their	O
inverters	O
when	O
the	O
grid	O
power	O
is	O
unavailable	O
.	O
</s>
<s>
There	O
are	O
a	O
few	O
different	O
variations	O
in	O
the	O
Smart-UPS	B-Application
lineup	O
.	O
</s>
<s>
Model	O
Characteristics	O
Smart-UPS	B-Application
The	O
standard	O
model	O
,	O
with	O
true	O
sine-wave	O
inverter	O
output	O
.	O
</s>
<s>
Later	O
known	O
as	O
the	O
Smart-UPS	B-Application
SMT	O
.	O
</s>
<s>
Smart-UPS	B-Application
SC	O
A	O
simplified	O
version	O
of	O
the	O
Smart-UPS	B-Application
,	O
based	O
on	O
Back-UPS	O
architecture	O
with	O
no	O
SmartSlot	O
expansion	O
and	O
with	O
modified	O
sine	O
wave	O
output	O
.	O
</s>
<s>
Smart-UPS	B-Application
SMC	O
An	O
economy	O
version	O
of	O
the	O
Smart-UPS	B-Application
SMT	O
,	O
with	O
no	O
SmartSlot	O
expansion	O
and	O
with	O
a	O
simplified	O
LCD	O
display	O
.	O
</s>
<s>
Smart-UPS	B-Application
XL	O
An	O
"	O
extended	O
run	O
"	O
series	O
,	O
with	O
an	O
Anderson	O
Powerpole	O
DC	O
connector	O
allowing	O
up	O
to	O
10	O
external	O
battery	O
packs	O
to	O
be	O
daisy-chained	O
to	O
the	O
main	O
unit	O
.	O
</s>
<s>
Smart-UPS	B-Application
RT	O
,	O
Smart-UPS	B-Application
SRT	O
An	O
online/double	O
-conversion	O
variant	O
providing	O
no	O
switchover	O
delay	O
during	O
a	O
power	O
loss	O
.	O
</s>
<s>
Smart-UPS	B-Application
VT	O
Uses	O
three-phase	O
power	O
,	O
for	O
larger	O
installations	O
.	O
</s>
<s>
All	O
Smart-UPS	B-Application
units	O
work	O
with	O
APC	O
's	O
proprietary	O
PowerChute	O
software	O
which	O
is	O
available	O
for	O
a	O
variety	O
of	O
operating	O
systems	O
.	O
</s>
<s>
A	O
free	O
alternative	O
to	O
PowerChute	O
is	O
the	O
Free	B-Application
software	I-Application
project	O
APC	O
UPS	O
Daemon	O
(	O
Apcupsd	B-Language
)	O
,	O
which	O
supports	O
Linux	O
,	O
Mac	O
OS	O
X	O
,	O
UNIX	O
and	O
Microsoft	O
Windows	O
operating	O
systems	O
and	O
can	O
run	O
in	O
stand	O
alone	O
or	O
client-server	O
modes	O
.	O
</s>
<s>
Legacy	O
Smart-UPS	B-Application
(	O
Not	O
SMX	O
,	O
SMT	O
,	O
or	O
SURTD	O
series	O
)	O
can	O
also	O
work	O
with	O
Network	B-Language
UPS	I-Language
Tools	I-Language
(	O
NUT	O
)	O
,	O
a	O
third	O
party	O
application	O
,	O
under	O
Linux	O
.	O
</s>
<s>
As	O
a	O
way	O
to	O
provide	O
UPS	O
management	O
,	O
monitoring	O
and	O
automatic	O
shutdown	O
of	O
attached	O
equipment	O
,	O
all	O
Smart-UPS	B-Application
models	O
include	O
at	O
least	O
one	O
serial	O
data	O
interface	O
(	O
RS-232	O
or	O
USB	B-Protocol
)	O
,	O
while	O
most	O
models	O
also	O
have	O
at	O
least	O
one	O
SmartSlot	O
expansion	O
port	O
,	O
with	O
the	O
larger	O
(	O
and	O
in	O
many	O
cases	O
older	O
)	O
Smart-UPS	B-Application
models	O
supporting	O
two	O
SmartSlots	O
.	O
</s>
<s>
Availability	O
of	O
more	O
SmartSlots	O
in	O
a	O
single	O
Smart-UPS	B-Application
unit	O
can	O
be	O
achieved	O
via	O
expansion	O
modules	O
such	O
as	O
the	O
AP9600	O
and	O
AP9604	O
models	O
.	O
</s>
<s>
Early	O
SmartSlot	O
cards	O
,	O
such	O
as	O
the	O
AP9605	O
,	O
provide	O
SNMP	B-Protocol
functionality	O
and	O
Telnet	B-Protocol
access	O
.	O
</s>
<s>
The	O
AP9617	O
and	O
newer	O
cards	O
add	O
10/100Base	O
-T	O
connectivity	O
,	O
Secure	O
HTTP	B-Protocol
,	O
Secure	B-Protocol
Shell	I-Protocol
(	O
SSH	B-Protocol
)	O
,	O
RADIUS	B-Protocol
,	O
SNMP	B-Protocol
Version3	O
,	O
PCNS	O
and	O
syslog	B-Protocol
functionalities	O
.	O
</s>
<s>
The	O
AP9618	O
model	O
also	O
provides	O
out-of-band	B-Application
management	I-Application
via	O
a	O
modem	O
connection	O
in	O
case	O
the	O
10/100	B-Protocol
Ethernet	I-Protocol
connection	O
is	O
down	O
.	O
</s>
<s>
Beginning	O
with	O
the	O
2009	O
release	O
of	O
the	O
SMT	O
models	O
(	O
and	O
later	O
SMX	O
and	O
SURTD	O
models	O
)	O
,	O
the	O
old	O
RS-232	O
data	O
interface	O
(	O
a	O
serial	O
port	O
with	O
DB-9	B-Protocol
connector	I-Protocol
)	O
has	O
been	O
replaced	O
with	O
a	O
10-pin	O
RJ50	O
socket	O
and	O
an	O
RJ50-to-DB-9	O
cable	O
connecting	O
to	O
the	O
protected	O
computer	O
's	O
serial	O
port	O
(	O
together	O
with	O
a	O
standard	O
USB	B-Protocol
interface	O
)	O
.	O
</s>
<s>
Addition	O
of	O
this	O
card	O
makes	O
the	O
current	O
models	O
backwards	O
compatible	O
with	O
older	O
software	O
built	O
for	O
the	O
older	O
Smart-UPS	B-Application
series	O
.	O
</s>
<s>
,	O
an	O
additional	O
option	O
has	O
been	O
made	O
available	O
in	O
form	O
of	O
new	O
firmware	B-Application
for	O
certain	O
SMT	O
and	O
SURTD	O
models	O
,	O
adding	O
publicly	O
documented	O
Modbus	B-Protocol
signalling	O
capability	O
to	O
the	O
proprietary	O
Microlink	O
protocol	O
,	O
allowing	O
third-party	O
developers	O
to	O
support	O
UPS	O
signalling	O
and	O
control	O
on	O
the	O
newer	O
Smart-UPS	B-Application
series	O
.	O
</s>
<s>
Both	O
electrical	O
and	O
mechanical	O
(	O
slot	O
keying	O
)	O
properties	O
of	O
the	O
new	O
SmartSlot	O
make	O
older	O
SmartSlot	O
cards	O
incompatible	O
with	O
current	O
Smart-UPS	B-Application
models	O
.	O
</s>
<s>
For	O
example	O
,	O
current	O
(	O
)	O
Smart-UPS	B-Application
model	O
SMT1500	O
is	O
compatible	O
only	O
with	O
AP9613	O
,	O
AP9620	O
,	O
AP9630	O
and	O
AP9631	O
SmartSlot	O
cards	O
.	O
</s>
<s>
However	O
,	O
most	O
NMC2	O
cards	O
(	O
including	O
AP9613	O
,	O
AP9630	O
and	O
AP9631	O
)	O
are	O
backward	O
compatible	O
with	O
older	O
Smart-UPS	B-Application
models	O
.	O
</s>
