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74
Configuring the 56/64 kbit data
communication modules
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The jumpers are accessible after the modem has been pulled out. This is done by first
removing all green 18-pin connectors at the back, then remove all screws holding the
back plate. After the back plate has been removed the modem can be pulled out.
There are LEDs for supervision of the communication channel that can be seen when
the cover around the fibre optic connectors is removed. These LED’s are found above
the DIP-switches. The function of the LED’s is explained in table
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RTS
Yellow
Request to send
CTS
Yellow
Clear to send
DSR
Yellow
Data communication correct
DCD
Yellow
Detection of carrier signal
TXD
Yellow
Transmitted data
RXD
Yellow
Received data
RA
Red
Remotely detected problem with link
MA
Red
Memory function for problem with link
LO
Green
Link operation correctly
LA
Red
Locally detected problem with link
Sync
Green
Used when synchronization is selected
Содержание 500 Series
Страница 6: ... RQWHQWV ...
Страница 32: ...26 Mounting methods and mounting details KDSWHU 7HUPLQDO GLPHQVLRQV DQG PRXQWLQJ DOWHUQDWLYHV ...
Страница 46: ...40 Test switch modules for RED 521 KDSWHU 7HUPLQDOV ZLWK D WHVW VZLWFK PRGXOH ...
Страница 72: ...66 Making the electrical connections KDSWHU OHFWULFDO FRQQHFWLRQV ...