Preparing
to
Make
Connections
As
seen
from
the rear the
system
console
port
is
the
top
left
female
RS-232
25-pin D-connector
on
the
back
of
the
chassis
The
auxiliary port
is
located
directly
below
the console
port
and
is
male
RS-232
25-pin
D-connector
RJ-45
Lock
Pug
On
systems
with
Basic
Rate
Interface
BRI
port
that
are
not licensed for
ISDN
use
an
RJ-45
lock
plug
comes
installed
in
the
BRI
port
See
Figure
2-8
Removing
this
plug without
authorization
is
violation of the software license
agreement
Figure
2-8
RJ-45 Lock
Plug
RS-232 Connections
When
setting
up
your router
consider distance
limitations
and
potential electromagnetic
interference
EMT
as
defined
in
the Electronic
Industries Associations
ETA
Recommended
Standard
232-C
Distance
Limitations
As
with
all
signaling
systems RS-232
signals
can
travel
limited distance
at
any given
bit
rate
generally
the slower the data rate the greater
the
distance
Table 2-1
shows
the standard
relationship
between
bit rate
and
distance
as
defined
in
RS-232-C
Console
port
Serial
V2
DB-25
port
On/Off
switch
AUX
port
DB-25
Serial
V2
port
port
Figure
2-1
RouterRear
View
with
Two
Serial One Token
Ring and
One
BRI
ports
Preparing
for Installation
2-9
Содержание 3000 Series
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