And Timing - Cisco 7000 Series Hardware Installation And Maintenance

Preparing Network Connections
CRC
transmitted
number
sender
predetermined
that
transmission
The
the
which
streams
Both
Cyclic
Modes

and Timing

Signal
DCE
DTE
set
configuration
Note
attached
DTE
device
the
mode
cable
Occasionally
transmission
the clock
FSIP
the invert-transmit-clock
For
Configuring
descriptions
documentation
All
completely
chapter
speeds
far
commonly
is
and
shown
rates
7000
2-38 Hardware
Cisco
is an
error-checking technique
data The
sender of
remainder
calculate
to
FCS
appends the value
number
The
receiver
used
the sender calculate
to
and
error occurred
16 and 32
indicate
designators
FCS
which
CRC-16 transmits
transmits streams of
16-bit
and
therefore
at faster
rates
and
the sender the receiver
CRC
Check
Redundancy
mode
the default for
all serial
is
PC
device such host
as
DCE
interface
up as
port
command
to set
DCE
mode
the default
is
DCE
When mode
using
most
the used
commonly
is
modem CSUIDSU
such
or
as
DCE
remote
device
provides
when
of the port
configuring
the clock
uses
it
automatically
with long cables
systems
Slight variances
speeds
and data
shift
signals to
number
is
reporting high
port
command
brief descriptions of the clockrate
Clock
Timing
and
instructions
on UniverCD
serial to
signals are subject
For
lost
cabling
specific
The and
distance
rate
distances for signaling
and
For
greater than these
instance
used
without
any
them
can for
compensate
here do
However
so
at
and
transmission distances
and
Maintenance
Installation
calculated
that
uses
data frame the
divides bits in
frame check
or sequence
the
the so
to that
message
frame
divides the contents
FCS
the the
If result is
sends to the sender
request
number check
the of
streams of
8-bit characters
characters
generates
better ongoing
provides
must use the same
setting
in for configuration
this
chapter
You
normally
ports
DCE
or another router
DCE
you must
use adapter
the clock
internal
speed
because allows
to
it you
you must
interfaces
still
mode You
normally use
DTE
Most
interfaces
DCB
the default
is
Although
DTE
When
interfaces
from remote
the
signal
may
experience high
in cable
construction
out of
phase
Inverting
of error
packets
suspect
and
invert-transmit-clock
Maintenance
Signals the chapter
in
the related software
refer to
manuals
the printed
in
or
which
distance limits
beyond
distance limitations
limits in these
descriptions
you can
however
usually
maximum
recommended
the
understand
problems If
you
should good
results
you
get
We
do
own
risk not
your
numeric
value detect
to
frame message
the
by
FCS
Before sends the
it
frame
contents
are exactly
the same
by
predetermined
the receiver
assumes
not
resend the frame
to
frame
are used
that
digits per
FCS
generates 16-bit
FCS
CRC-32
32-bit transmits
correction with
error
See
the section Configuring
instructions
DCE when
use
connecting
mode
clock
internal
an
requires
and use the clockrate
cable
without
perform loopback tests
clock
the internal
specify
DTE
when
the router
connecting
require an external clock
mode
you do need
not
DTE
the port recognizes the
DCE
device
when
rates
error
operating
and
other
factors
temperature
the clock can often correct
and
shift invert
phase
commands
refer
For
complete
command
and
configuration
signal degrades
significantly
Distance Limitations
refer to
IEEE-recommended
are the
results at
good
get speeds
Mbps
for V.35
is
rate
the electrical
problems
distances greater than
and
with
rates
recommend exceed
that
you
in
errors
predetermined
the
frame
the
divisible
by
number
that
calculate
to
CRC-32
longer
retransmits
less
32-Bit
the router
to
To
signal
cable
rate
DCE
to
which
signal
the
to
specify
interface
the higher
at
can cause
this shift If an
the clock with
the section
to
command
reference
or
is
in
earlier this
maximum
and
distances
but
Mbps
that arise
might
those
data
published