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Nortel Networks Circuit Card Benutzerhandbuch

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 QPC841 Quad Serial Data Interface card
 Page 873 of 906
Figure 188
QPC841 QSDI card block diagram
UART
no. 1
UART
no. 2
UART
no. 3
UART
no. 4
UARTs
Address
decode logic
TD
RD
TD
RD
TD
RD
TD
RD
RS-232-C
drivers and receivers
Clock and bit 
rate select logic
Processor
bus
553-5986
Port 1
Port 2
Port 3
Port 4
J1
J2