<s>
Ethernet	B-Protocol
over	I-Protocol
PDH	I-Protocol
or	O
EoPDH	B-Protocol
is	O
one	O
of	O
many	O
techniques	O
that	O
provided	O
Ethernet	O
connectivity	O
over	O
non-Ethernet	O
networks	O
.	O
</s>
<s>
Specifically	O
,	O
EoPDH	B-Protocol
is	O
a	O
standardized	O
methodology	O
for	O
transporting	O
native	O
Ethernet	O
frames	O
over	O
the	O
existing	O
telecommunications	O
copper	O
infrastructure	O
by	O
leveraging	O
the	O
established	O
PDH	B-Protocol
transport	O
technology	O
.	O
</s>
<s>
EoPDH	B-Protocol
is	O
one	O
of	O
several	O
Ethernet	O
transport	O
technologies	O
that	O
enables	O
Telecommunication	O
Service	O
Providers	O
to	O
offer	O
"	O
Carrier	B-Protocol
Ethernet	I-Protocol
"	O
services	O
.	O
</s>
<s>
Also	O
commonly	O
used	O
as	O
a	O
means	O
of	O
connecting	O
businesses	O
to	O
a	O
Metro	B-Protocol
Ethernet	I-Protocol
network	O
.	O
</s>
<s>
EoPDH	B-Protocol
is	O
based	O
on	O
a	O
collection	O
of	O
technologies	O
and	O
standards	O
that	O
allow	O
telecommunications	O
Carriers	O
to	O
make	O
use	O
of	O
their	O
extensive	O
networks	O
of	O
legacy	O
PDH	B-Protocol
and	O
SONET/SDH	B-Protocol
(	O
Synchronous	B-Protocol
Digital	I-Protocol
Hierarchy	I-Protocol
)	O
equipment	O
to	O
provide	O
new	O
Ethernet	O
services	O
.	O
</s>
<s>
In	O
addition	O
,	O
the	O
collection	O
of	O
EoPDH	B-Protocol
standards	O
provide	O
for	O
interoperability	O
and	O
the	O
gradual	O
migration	O
of	O
Carriers	O
to	O
Ethernet	O
network	O
.	O
</s>
<s>
EoPDH	B-Protocol
is	O
a	O
standardized	O
methodology	O
for	O
transporting	O
native	O
Ethernet	O
frames	O
over	O
PDH	B-Protocol
links	O
such	O
as	O
T1	B-Protocol
,	O
E1	O
,	O
or	O
DS3	O
.	O
</s>
<s>
The	O
technologies	O
used	O
in	O
EoPDH	B-Protocol
include	O
GFP	B-Protocol
frame	O
encapsulation	B-Protocol
,	O
Ethernet	O
Mapping	O
,	O
Virtual	B-Protocol
Concatenation	I-Protocol
,	O
Link	B-Protocol
Capacity	I-Protocol
Adjustment	I-Protocol
Scheme	I-Protocol
,	O
and	O
Management	O
Messaging	O
(	O
)	O
.	O
</s>
<s>
Common	O
practices	O
in	O
EoPDH	B-Protocol
equipment	O
also	O
include	O
the	O
tagging	O
of	O
traffic	O
for	O
separation	O
into	O
virtual	O
networks	O
,	O
prioritization	O
of	O
user	O
traffic	O
,	O
and	O
a	O
broad	O
range	O
of	O
higher-layer	O
applications	O
such	O
as	O
DHCP	B-Protocol
servers	I-Protocol
and	O
HTML	O
user	O
interfaces	O
.	O
</s>
