Nortel Circuit Card Installation Manual page 873

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