6 Router Card (WS-X3011) Configuration Note
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
Typical DTE and DCE Devices
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
EIA/TIA-232 Specifications
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
EIA/TIA-449, V.35, X.21, and EIA-530 Specifications
Device Type
Gender
Typical
Devices
DTE
Male
1
1
If pins protrude from the base of the connector, the
connector is male.
Terminal
PC
Router
DCE
Female
2
2
If the connector has holes to accept pins, the connector
is female.
Modem
CSU/DSU
3
Multiplexer
3
CSU/DSU = Channel service unit/data service unit.
Data Rate
(Baud)
Distance
(Feet)
Distance
(Meters)
2400
200
60
4800
100
30
9600
50
15
19200
50
15
38400
50
15
64000
25
7.6
Data Rate
(Baud)
Distance
(Feet)
Distance
(Meters)
2400
4,100
1,250
