Nortel Networks 553-3001-211 manual NT8D41BA Qsdi paddle board block diagram, Uart

Page 672 of 894 NT8D41BA Quad Serial Data Interface Paddle Board

Other logic on the card includes baud rate generators, RS-232-C driver/ receiver pairs, and the switches and logic needed to configure each UART.

Figure 159

NT8D41BA QSDI paddle board block diagram

RS-232-C

UARTs

UART

no. 1

UART

no. 2

UART

no. 3

UART

no. 4

Address

decode logic

Processor

bus

drivers and receivers

TD

Port 1 J1

RD

TD

Port 2

RD

TD Port 3 J2

RD

TD

RD Port 4

Clock and bit rate select logic

553-5986

System considerations

In dual-processor systems, the QSDI paddle board will behave differently depending on which backplane socket it is installed. Installing the paddle board into a socket in the network area of the backplane allows it to work when either of the system processors is active. Installing the paddle board into a socket in the CPU area of the backplane allows it to work only when that CPU is active.

553-3001-211 Standard 2.00 September 2004