Cisco 7000 Series Hardware Installation And Maintenance page 58

Standard RS-232C
Table 2-3 IEEE
Distance Feet
Rate bps
2400 200
4800 100
9600 50
19200 25
38400
12
56000
8.6
RS-449
drivers allow
Balanced
between
standard
relationship
Standard RS-449
Table 2-4 IEEE
bps Distance
Feet
Rate
2400 4100
4800 2050
9600 1025
19200 513
38400 256
102
56000
76
128000
50
256000
Ti
1544000 50
2000000 40
4000000 25
The recommended
Note distance
RS-530 However
X.21 and
common RS-449
In
practice
without
any problems
HSSI Connections
HSSI
The
EIA/TIA
standard
Mbps HSSI
52
connections
HSSI
The
feet
meters
DTE DCE
Both and
on
ports
similar
is to
SCSI-TI-type
stringent than
more
is
specification
HSSI
interface
may
prevent
Transmission
versus
Speed
Distance Meters
60
30
15
76
3.7
2.6
greater distances than
to travel
signals
RS-449
and distance
bit for
rate
Transmission versus
Speed
Meters
Distance
1250
625
312
156
78
31
23
15
15
12
RS-449 shown
limits for
can
good results at
you
get
and RS-530
2-Mbps
support
maximum
612/613
specifies
The
nominal cable
typical
25
cable
interface
comprises
DSU
HIP and
the
the
are 50-pin
small computer
interface
systems
SCSI-IT
that for
Substituting
of the interface
operation
proper
Distance
RS-232
Table
signals
Distance
valid for
in Table 2-4
are also
greater than
distances and
rates far
and
V.35 4-Mbps
rates supports
50
15
cable length of
feet
between HIP and
length the
and
twisted pairs
50-pin plug
HSSI
The
receptacles
HSSI
the
cable however
cable
SCSI-type
Preparing
Site
Requirements
shows
2-4
the
V.35
these
rates
meters
for
DSU
the
is
end
each
at
cable
interface
cable
connect the
to
for Installation 2-7