<s>
Ethernet	O
Routing	O
Switch	O
3500	O
series	O
and	O
Ethernet	O
Routing	O
Switch	O
2500	O
series	O
or	O
ERS	O
3500	O
and	O
ERS	O
2500	O
in	O
data	O
computer	B-Architecture
networking	I-Architecture
terms	O
are	O
stackable	B-Protocol
routing	I-Protocol
switches	I-Protocol
designed	O
and	O
manufactured	O
by	O
Avaya	O
.	O
</s>
<s>
The	O
'	O
PWR	O
 '	O
suffix	O
designation	O
identifies	O
the	O
Switch	O
that	O
can	O
provide	O
Power-over-Ethernet	B-Device
on	O
the	O
copper	O
Ethernet	O
ports	O
,	O
the	O
'	O
+	O
 '	O
suffix	O
designation	O
indicates	O
that	O
the	O
Switch	O
can	O
provide	O
PoE	B-Device
plus	I-Device
on	O
the	O
copper	O
ports	O
.	O
</s>
<s>
comparing	O
the	O
2500	O
systems	O
to	O
Catalyst	O
2960-24T	O
and	O
HP	B-Operating_System
ProCurve	I-Operating_System
2626	O
and	O
2650	O
systems	O
.	O
</s>
<s>
The	O
ERS	O
2550T-PWR	O
supports	O
PoE	B-Device
capabilities	O
on	O
half	O
of	O
the	O
user	O
ports	O
.	O
</s>
<s>
System	O
scaling	O
is	O
accomplished	O
by	O
stacking	O
eight	O
ERS	O
2550T-PWR	O
systems	O
together	O
to	O
provide	O
up	O
to	O
384	O
ports	O
of	O
copper	O
10/100BASE	O
-T	O
and	O
with	O
the	O
ERS	O
2550T-PWR	O
models	O
,	O
192	O
of	O
the	O
ports	O
will	O
support	O
Power-over-Ethernet	B-Device
(	O
all	O
the	O
ports	O
with	O
the	O
red	O
border	O
around	O
them	O
will	O
support	O
PoE	B-Device
-	O
see	O
the	O
adjacent	O
picture	O
)	O
and	O
up	O
to	O
16	O
ports	O
of	O
1000BASE-X	O
Small	B-Protocol
form-factor	I-Protocol
pluggable	I-Protocol
transceivers	I-Protocol
.	O
</s>
<s>
The	O
ERS	O
2526T-PWR	O
model	O
offers	O
PoE	B-Device
support	O
on	O
half	O
of	O
the	O
user	O
ports	O
.	O
</s>
<s>
When	O
staking	O
eight	O
ERS	O
2526T	O
models	O
it	O
will	O
provide	O
192	O
ports	O
of	O
copper	O
10/100BASE	O
-T	O
,	O
and	O
with	O
the	O
ERS	O
2526T-PWR	O
models	O
96	O
of	O
the	O
ports	O
will	O
support	O
PoE	B-Device
and	O
up	O
to	O
16	O
ports	O
of	O
1000BASE-X	O
Small	B-Protocol
form-factor	I-Protocol
pluggable	I-Protocol
transceivers	I-Protocol
.	O
</s>
<s>
The	O
stack	O
operates	O
on	O
a	O
bi-directional	O
and	O
shortest	O
path	O
forwarding	O
star	B-Architecture
topology	I-Architecture
that	O
allows	O
traffic	O
to	O
flow	O
either	O
'	O
upstream	O
 '	O
or	O
downstream	O
 '	O
simultaneously	O
from	O
every	O
switch	O
allowing	O
packets	O
to	O
take	O
the	O
optimal	O
forwarding	O
path	O
(	O
shortest	O
path	O
)	O
.	O
</s>
<s>
This	O
stacking	O
technology	O
allows	O
stackable	B-Protocol
switches	I-Protocol
to	O
operate	O
with	O
the	O
same	O
performance	O
and	O
resiliency	O
as	O
chassis	O
solution	O
.	O
</s>
