Cisco 7513 Series, Hardware Installation And Maintenance Manual

Page: 205 / 289

Installing
and
Configuring
Processor Modules
If
you
are
changing
the
mode
of the interface
from
DCE
to
DTE
you do
not
need
to change
the clock
rate
for the port After
you
replace
the
DCE
cable with
DTE
cable
and
the
system
recognizes
the
interface
as
DTE
it
will
use the external clock
signal
from
the
remote
DCE
device and
ignore
the
internal
clock
signal
that
the
DCE
interface
normally
uses Therefore once
you configure
the clock
rate on
port for
either
DCE
interface or loopback
you
can
leave the clock
rate
configured
and
still use
that
port as
DTE
interface
Removing
and
Replacing
Serial
Port
Adapters
Serial
port adapters provide
the high-density
ports for
FSIP
serial
interfaces
Each
port adapter
provides
two
ports
and
each
port supports any
one
of the available
interface
types EIA/TIA-232
EIAJTIA-449 V.35
X.21 and EIA-530
See
the section
Fast
Serial
Interface
Processor
in the
chapter
Product
Overview
for discussion
of the universal
serial port
adapters
The
adapter
cable
connected
to
the port determines
the
electrical
interface
type
and
mode DTE
or
DCE
of the
interface
Each FSIP
is
shipped
from
the factory with four
or eight
port adapters
installed
FSIP
port
adapters
are spare parts
if
you have
spares
on hand and have
failure
you
can
replace
interfaces
without
having
to
return the
FSIP
to
the factory
You
cannot however
add
ports
to
an
FSIP by
installing
additional
port adapters
The
four-port
FSIP
supports only
one
four-port
module
To change
the
electrical
interface
type or
mode
of
port
you need
only replace
the adapter cable
and
reset
the interface
When
setting
up
the
DCE
port
you must
also set
the clock
rate
Although
DCE
is the default
mode
you do
not
need
to
specify
the
mode when
configuring
DTE
interfaces
When
the port recognizes the
DTE
interface
cable
it
automatically uses
the clock
signal
from
the
remote
DCE
device
Caution
Remove
and
install
port adapters only
when
it is
necessary
to
replace
interfaces
Do
not
attempt to isolate faults or
to
troubleshoot
FSIPs
or
serial
interfaces
by swapping
port adapters
The
surface-mount
circuitry
on
the port adapters
will
not
tolerate
excessive
handling
All
serial interface
types support
NRZI
format
and
32-bit
CRC
both of
which
you
set
with software
commands
Refer to
the section
Configuring
the
FSIP
earlier
in
this
chapter
For
complete
command
descriptions
and
instructions
refer to
the related software
documentation
Tools Required
You need
the following
tools to
complete
this
procedure
Number
Phillips
or 3/16-inch flat-blade screwdriver
3/16-inch nut driver
Wrist
strap
or other
grounding
device
to
prevent
ESD
damage
Maintaining
the Router 5-43