Black Box MWU2000-X21 - Manual (Page 110)

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2.048Mbps Wireless Modem
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• DTE A supplies the Master clock.
• Modem A is configured as “Master”, DCE external clock.
• Modem B is configured as “Slave”, DCE internal clock.
Connecting your 2.048Mbps Wireless Modem to another modem
Figure A-3. Modem configured as DCE
• Modem A is defined as a DCE. It supplies the clock for the 2.048Mbps Wireless Modems.
• 2.048Mbps Wireless Modem A is configured as “Master”, DTE (except in applications with
an X.21 interface).
• 2.048Mbps Wireless Modem B is configured as “Slave”, DCE internal clock.
RS-530/V.35/X.21 Back-to-Back Configuration
Figure A-4. RS-530/V.35/X.21 Back-to-Back Configuration
Setting the Jumper Configuration for the LIU-V.35 and LIU RS-530/X.21
Boards
You can access the jumpers by opening the two screws of the rear panel and carefully sliding
out the boards. The jumpers are located at the upper side of the LIU board, close to the D-25
connector. Disconnect all cables, including the power cable from the unit before opening.
The LIU configuration is set by both software and hardware. Software setting is done in the
DCE/DTE menu in the LIU parameters sub-menu of the Parametersmenu. Hardware setting
is done by jumpers on the LIU-V.35 or the LIU-RS-530/ X.21 circuit board. The following
settings are available: