Total Access 362R Single Family Unit with RF Return Installation and Maintenance Guide
4
61187715G1-5B
office
and
the
customer
premises
are
replaced
by
passive
components
that
guide
traffic
based
on
splitting
optical
wavelengths
to
end
points
along
the
way.
These
passive
components,
such
as
splitters
and
coupler
devices,
work
by
passing
or
restricting
light
and
do
not
require
power
to
transmit
data.
In
a
PON,
a
single
fiber
can
be
run
from
the
serving
exchange
out
to
a
subdivision
or
office
park.
Then,
individual
fiber
strands
can
be
run
to
each
building.
Also,
serving
equipment
can
be
split
from
the
main
fiber
using
passive
splitters/couplers.
This
allows
one
fiber
cable
from
the
exchange
to
the
customer
to
be
shared
by
many
customers.
This
dramatically
lowers
the
overall
costs
of
deployment
for
Fiber
To
The
Premises
(FTTP)
applications.
In
this
type
of
network,
the
subscriber’s
voice,
video,
and
data
devices
are
connected
to
the
GPON
via
the
ONT.
The
ONT
translates
IP
data
and
analog
voice
into
GPON
Encapsulated
Method
(GEM)
frames
and
combines/splits
the
signal
with
analog
and/or
digital
video
to
and
from
the
OLT.
The
signal
is
split/combined
at
the
OLT
similar
to
the
ONT.
GEM
is
based
on
the
SONET/SDH
Generic
Framing
Procedure
(GFP)
for
handling
time
division
multiple
access
(TDMA),
ATM
and
Ethernet
based
traffic
without
additional
encap
‐
sulation
protocols.
Signal
transmission
from
ONTs
to
the
OLT
use
a
type
of
TDMA.
TDMA
is
a
technique
used
to
frame
channels
of
data.
In
this
technique,
data
communication
sessions
originating
from
multiple
points
are
transmitted
in
turn.
Each
data
communication
session
is
assigned
a
time
slot
in
the
TDMA
frame
and
transmits
(or
accesses
that
time
slot)
only
at
that
time.
To
allow
for
the
transmission
of
downstream
and
upstream
traffic
on
a
single
fiber,
different
wavelengths
are
used
for
both
directions.
Downstream
traffic
uses
1490
nm
while
upstream
traffic
uses
1310
nm.
For
return
of
RF
TV
distribution,
a
second
downstream
wavelength
of
1550
nm
is
used.
RF
uses
1610
nm
for
the
upstream
return
path.
Downstream
data
is
broadcast
from
the
OLT
to
all
ONTs.
Each
ONT
processes
the
data
destined
to
it
by
matching
the
address
at
the
protocol
transmission
unit
header.
The
downstream
PON
signal
is
broadcast
to
up
to
32
ONTs
with
a
data
rate
of
2.5
Gbps
for
voice
and
data,
plus
the
additional
video
overlay
wavelength
division
multiplexing
(WDM)
signal.
In
the
upstream
direction
transmission
of
data
must
be
coordinated
between
each
ONT
to
avoid
collisions
due
to
the
shared
media
of
the
optical
distribution
network
(ODN).
Data
is
transmitted
according
to
control
mechanisms
configured
in
the
OLT.
The
aggregate
upstream
rate
is
1.25
Gbps.
Features
The
basic
features
of
the
ONT
include
the
following:
• Box
‐
in
‐
box,
weatherproof
and
access
controlling
construction
• Entry
ports
for
fiber,
power,
ground,
Ethernet,
telephone,
and
RF
TV
• Reports
four
alarms
from
the
UPS
power
supply
• Supports
1.25
Gbps
upstream
and
2.5
Gbps
downstream
GPON
application
as
per
ITU
‐
T
G.984.2
specification
• Data
services
supported
by
up
to
two
10/100/1000Base
‐
T
Ethernet
interfaces
• One
RF
Interface
• Basic
telephone
service
supported
by
two
POTS
interfaces
• 12
VDC
power
supply
