Cisco AGS+, Hardware Installation And Maintenance

Page: 37 / 146

Network Connection
Considerations
tnterference Considerations
When
wires
are
run
for any
significant
distance
in
an electromagnetic
field interference
can occur
between
the
field
and
the signals on
the
wires
This
fact
has
two
implications for
the construction of
terminal plant wiring
Bad
practice
can
result in
radio interference
emanating
from
the plant wiring
Strong electromagnetic interference especially as
caused by
lightning or radio transmitters can
destroy the
RS-232
drivers
and
receivers
in
routers
Note
To
predict
and remedy
strong electromagnetic
interference
you
may
need
to
consult experts
in
radio frequency interference
RET
If you use unshielded
twisted-pair
UTP
cables
in your plant wiring
with good
distribution
of
grounding
conductors the plant wiring
is unlikely to
emit radio interference
When
exceeding the
distances
listed in
Table 2-4
use
high-quality twisted-pair cable
with one ground conductor
for
each data signal
If
wires exceed recommended
distances or pass
between
buildings give
special
consideration
to
the
effect
of lightning
strikes in
your vicinity
The
electromagnetic pulse
EMP
caused by
lightning or
other high-energy
phenomena can
easily
couple
enough
energy
into unshielded conductors
to
destroy electronic
devices
If you have had problems
of
this sort
in
the
past
you
may
want
to
consult
experts
in electrical
surge suppression
and
shielding
Most
data centers cannot resolve
the infrequent
but potentially catastrophic problems
just
described
without
pulse meters
and
other special equipment
These problems
can
cost
great deal of time
to
identify
and
resolve so take precautions
to
avoid these problems by
providing properly
grounded
and
shielded environment with special
attention to
issues of
electrical
surge suppression
ConsoDe
and
Auxiliary
Port
Connection
Prerequisites
You must
adjust the
baud
rate
of your terminal
to
match
the
console
and
auxiliary port default
baud
rate
of
9600
data bits
no
parity
and
stop bits Consult your terminals
documentation for
this
wiring specification
The
console
port is
data
communications
equipment
DCE
device and
the
auxiliary
port
is
data terminal equipment
DTE
device
If
necessaly
refer
to
Appendix
Cabling
Specifications
for the console
and
auxiliary port wiring
scheme
required to
connect the
router
to
console terminal
or to
build your
own
cables
Network Connection Consideraflons
Your
installation
needs
depend
on many
factors
including
the interfaces
you plan to
use You
may
need some
of the following data
communication
equipment
to complete
your
installation
To
install
and
configure
the
router you need
terminal with an RS-232
DTE
connector
You
can
detach the terminal
and
cable after
the
installation
and
configuration procedures
are complete
To
use an
IEEE
802.3
or Ethernet interface
at
your installation
you need
an 802.3
media
attachment
unit
MAU
and
an attachment
unit
interface
AUI
cable
or
an
Ethernet transceiver
and
transceiver cable
These
devices
can be purchased as additional equipment Contact
customer service representative This additional
equipment
is
not required
for
lOBaseT
connection with the
lOBaseT
applique
2-10
AGS
Hardware
Installation
and Maintenance