Total Access 372 Small Business Unit ONT Installation and Maintenance Guide
6
61287722G1-5B
Components and Interfaces
The
SBU
ONT
consists
of
the
following
components
and
interfaces:
• Mechanical
Components
• Electronics
Module
• Circuit
Board
Mechanical Components
The
SBU
ONT
is
designed
for
outdoor
or
indoor
applications.
The
Adtran
model
774
or
775
outdoor
Network
Interface
Device
(NID)
housing
is
intended
as
a
demarcation
point
between
the
Telco
and
a
subscriber
premises
for
outdoor
application.
For
indoor
application,
neither
of
these
housings
are
used.
The
demarcation
point
is
the
Electronics
Module
itself.
Outer Enclosure
The
Outer
Enclosure
provides
both
environmental
control
(weatherproofing)
and
access
control.
Outer Enclosure Security Locking Feature
The
enclosure
is
intended
for
use
on
the
outside
of
a
building
and
is
designed
to
meet
US
environmental
requirements.
The
unit
is
weather
hardened
and
is
able
to
withstand
70
m.p.h.
wind
driven
rain,
high
temperature,
cold
temperature,
drop
tests
and
all
other
GR
‐
49,
GR
‐
950,
and
GR
‐
487
requirements.
The
dimensions
are
approximately
15”
high
x
12”
wide
x
4”
deep
(381
mm
x
305
mm
x
102
mm).
The
external
door
provides
access
to
the
RJ
‐
11
test
connectors,
Ethernet
RJ
‐
45
connectors.
and
DS1
connectors
The
enclosure
door
is
held
in
the
closed
position
by
two
“snap”
door
retainers.
To
open
the
door
these
two
snaps
must
be
disen
‐
gaged
at
the
same
time.
The
Outer
Enclosure
Door
has
a
double
security
locking
feature
provided
by
the
third
molded
part.
This
provides
the
following
capabilities:
• Subscriber
access
door
is
closed
using
a
flat
head
screw
• Telco
personnel
can
control
access
via
the
Pin
‐
in
‐
Hex
screw
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