Cisco WS-X3011 Configuration Note page 6

Preparing to Connect to a Network
devices. The documentation that came with the device should indicate whether it is a DTE or DCE
device. (Some devices have a jumper to select either mode.) If you cannot find the information in the
documentation, refer to Table 3 to help you select the proper device type.
Table 3
Device Type
DTE
DCE
1
2
3
Speed and Distance Limitations
Serial signals can travel a limited distance at any given bit rate; generally, the slower the data rate,
the greater the distance. All serial signals are subject to distance limits, beyond which a signal
degrades significantly or is completely lost.
Table 4 lists the maximum speeds and distances for EIA/TIA-232 signals. This signaling standard
supports unbalanced circuits at signal speeds up to 64 kbps.
Table 4
Data Rate
(Baud)
2400
4800
9600
19200
38400
64000
Balanced drivers allow EIA/TIA-449 signals to travel greater distances than the EIA/TIA-232
signals. Table 5 lists the maximum speeds and distances for EIA/TIA-449, V.35, X.21, and EIA-530
signals.
Table 5
Data Rate
(Baud)
2400
6 Router Card (WS-X3011) Configuration Note
Typical DTE and DCE Devices
Gender
1
Male
2
Female
If pins protrude from the base of the connector, the
connector is male.
If the connector has holes to accept pins, the connector
is female.
CSU/DSU = Channel service unit/data service unit.
EIA/TIA-232 Specifications
Distance
(Feet)
200
100
50
50
50
25
EIA/TIA-449, V.35, X.21, and EIA-530 Specifications
Distance
(Feet)
4,100
Typical
Devices
Terminal
PC
Router
Modem
3
CSU/DSU
Multiplexer
Distance
(Meters)
60
30
15
15
15
7.6
Distance
(Meters)
1,250