3Com 3C13886 - Router OC-3 ATM SML Flexible Interface Card Installation Manual page 65

3Com Router Module Guide
Table 3-12 Baud rate and transmission distance of V.24 (RS232)/V.35 cable
Baud rate (bps)
2400
4800
9600
19200
38400
64000
115200
-
Caution:
Baud rate cannot exceed 64 kbps if V.24 cable is used and the interface operates in synchronous mode.
II. Introduction to DTE and DCE
Synchronous serial interfaces support both DTE and DCE operating modes. Given
two directly connected devices, if one operates in the DTE mode, the other will operate
in the DCE mode. The DCE device provides the synchronous clock and specifies the
communicating rate. The DTE device receives the synchronous clock and
communicates at the specified rate. Generally, the Router is used as a DTE device. To
make sure that the device is a DTE or DCE, refer to the manual shipped with this
device. In addition, the following table may also help you to identify the type of the
device.
Table 3-13 Typical DTE and DCE equipment
Equipment type
DTE
DCE
V.24 (RS232)
Maximum transmission
Distance (m)
60
60
30
30
20
20
10
-
Interface type
Male
Female
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Chapter 3 Multifunctional Interface Modules
Baud rate
(bps)
2400
4800
9600
19200
38400
56000
64000
2048000
Typical equipment
PC, Router
Modem, Multiplexer, CSU/DSU
V.35
Maximum transmission
Distance (m)
1250
625
312
156
78
60
50
30