© Copyright Lenovo 2018
Chapter 2: Installing and Removing the NE2552E
21
Connecting Switch Ports
The
switch
includes
a
variety
of
external
port
options.
Fixed
ports,
such
as
the
RJ
‐
45
management
port,
can
be
connected
directly
by
attaching
the
appropriate
cable.
Modular
ports,
such
as
Small
Form
‐
factor
Pluggable
Plus
(SFP28)
and
Quad
Small
Form
‐
factor
Pluggable
Plus
(QSFP28)
ports,
require
the
installation
of
a
transceiver
module
before
the
cable
can
be
attached.
This
section
covers
each
supported
port
type
separately:
Notes:
The
illustrations
in
this
document
might
differ
slightly
from
your
hardware.
While
the
information
in
this
section
describes
the
25
Gigabit
Ethernet
(GbE)
SFP28
and
100
Gigabit
Ethernet
(GbE)
QSFP28
transceiver
modules,
it
also
applies
to
the
10
GbE
SFP+
transceiver
modules
The
switch
supports
MSA
‐
compliant
copper
DACs,
up
to
5
m
(16.5
ft.)
in
length.
The Serial Console Port
This
section
discusses
connecting
and
disconnecting
the
serial
console
cable.
Connecting the Serial Console Cable
To
use
the
serial
console,
connect
a
serial
cable
to
the
RS
‐
232
serial
console
port
of
the
switch
and
the
other
end
of
the
cable
to
the
console
device.
Note:
You
must
use
one
of
the
two
cables
in
the
Serial
Access
Cable
option.
If
your
console
device
uses
a
standard
RS
‐
232
DB9
connector,
attach
the
included
mini
‐
USB
‐
to
‐
DB9
serial
cable.
Otherwise,
if
your
console
device
uses
an
RJ
‐
45
connector,
attach
the
included
mini
‐
USB
‐
to
‐
RJ
‐
45
serial
cable
and
a
user
‐
supplied
RJ
‐
45
adapter
cable.
Your
adapter
cable
depends
on
the
pin
out
required
by
your
console
device.
Pin
out
of
the
mini
‐
USB
‐
to
‐
RJ
‐
45
cable
is
as
follows:
Table 2.
Pin
out
for
the
included
mini
‐
USB
‐
to
‐
RJ
‐
45
cable
PIN #
Function
Direction
1
Not
connected
2
RXD
In
3
TXD
Out
4
GND
5
GND
