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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 3
Multifunctional Interface Modules (Router 5000)
3-21
Table 3-12 Baud rate and transmission distance of V.24 (RS232)/V.35 cable
V.24 (RS232) V.35
Baud rate (bps)
Maximum transmission
Distance (m)
Baud rate
(bps)
Maximum transmission
Distance (m)
2400 60 2400 1250
4800 60 4800 625
9600 30 9600 312
19200 30 19200 156
38400 20 38400 78
64000 20 56000 60
115200 10 64000 50
- - 2048000 30
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 Interface type Typical equipment
DTE Male PC, Router
DCE Female Modem, Multiplexer, CSU/DSU