Transition Networks
SM24DPB Install Guide
33681 Rev. B
https://www.transition.com
Page
18
of
24
Troubleshooting
Most
problems
are
caused
by
the
following
situations.
Check
for
these
items
first
when
starting
your
troubleshooting:
1.
Connecting
to
devices
that
have
a
fixed
full
‐
duplex
configuration.
Make
sure
all
devices
connected
to
the
SM16TAT2DPA
Switch
devices
are
configured
to
auto
negotiate,
or
are
configured
to
connect
at
half
duplex.
2.
Faulty
or
loose
cables.
Look
for
loose
or
obviously
faulty
connections.
If
they
appear
to
be
OK,
make
sure
the
connections
are
snug.
If
that
does
not
correct
the
problem,
try
a
different
cable.
3.
Non
‐
standard
cables.
Non
‐
standard
and
miswired
cables
may
cause
network
collisions
and
other
network
problems,
and
can
seriously
impair
network
performance.
Use
a
new
correctly
‐
wired
cable.
A
Category
5
cable
tester
is
a
recommended
tool
for
every
100Base
‐
TX
and
1000Base
‐
T
network
installation.
4.
Improper
Network
Topologies.
It
is
important
to
make
sure
you
have
a
valid
network
topology.
If
you
no
longer
experience
the
problems,
the
new
topology
is
probably
at
fault.
In
addition,
you
should
make
sure
that
your
network
topology
contains
no
data
path
loops.
5.
Check
the
port
configuration.
A
port
on
your
Switch
may
not
be
operating
as
you
expect
because
it
has
been
put
into
a
“blocking”
state
by
Spanning
Tree,
GVRP
(automatic
VLANs),
or
LACP
(automatic
trunking).
(Note
that
the
normal
operation
of
the
Spanning
Tree,
GVRP,
and
LACP
features
may
put
the
port
in
a
blocking
state.)
Or,
the
port
just
may
have
been
configured
as
disabled
through
software.
6.
SYS
LED
is
Off.
Check
connections
between
the
switch,
the
power
cord
and
the
wall
outlet.
Contact
Tech
Support
for
assistance.
See
Contact
Us
below.
7.
Link
LED
is
Off.
Verify
that
the
switch
and
attached
device
are
powered
on.
Be
sure
the
cable
is
plugged
into
the
switch
and
corresponding
device.
If
the
switch
is
installed
in
a
rack,
check
the
connections
to
the
punch
‐
down
block
and
patch
panel.
Verify
that
the
proper
cable
type
is
used
and
its
length
does
not
exceed
specified
limits.
Check
the
adapter
on
the
attached
device
and
cable
connections
for
possible
defects.
Replace
the
defective
adapter
or
cable
if
necessary.
8.
Contact
Transition
Networks
Tech
Support
for
assistance.
See
Contact
Us
below.
Related
Manuals
The
following
manuals
detail
related
switch
aspects:
•
SM24DPB
Quick
Start
Guide,
33680
•
SM24DPB
Web
User
Guide,
33682
•
SM24DPB
CLI
Reference,
33683
•
SFP
manuals
(model
specific)
•
Release
Notes
(version
specific)
Also,
as
part
of
the
switch
software,
there
is
an
online
web
‐
based
help
that
describes
the
management
related
features.
