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s Wireless Modem
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Appendix A - V.35/RS-530/X.21 Applications
DCE/DTE Configuration
The following is a description of the possible configurations when connecting V.35/RS-
530/X.21 end equipment to the 2.048Mbps Wireless Modem. The configurations described
are applicable to software version 1.5 and up with a V.35/RS-530/X.21 LIU equipped with
jumpers for setting the mode of operation.
V.35/RS-530/X.21 Standards
These standards define the operation of a communications channel, consisting of end
equipment units connected to the communications channel by a modem. The standards define
DATA circuits and LOCK circuits to time them.
The end equipment is normally called DTE and the modem is normally called DCE. A DTE
connects to a DCE. DTE or DCE assignments define the direction of the DATA, CLOCK,
and CONTROL circuits supported by the standard.
Table 1 describes the possible configurations:
Table A-1. Possible DTE/DCE Configurations
Configuration Options
The 2.048 Mbps Wireless modem can be configured either as a DTE or as a DCE. The
configuration is set by jumpers on the LIU board and through theRS-232 monitor.
It is important to note that modem assumes that the clock frequency on both sides of the link
is exactly the same, therefore the clock frequency can be forced on the Master side of the link
only.
Possible configurations are described in Table A-2.