Nortel Circuit Card 311 Reference page 833

The QSDI paddle board design contains four Universal Asynchronous
Receiver/Transmitters (UARTs) and the logic necessary to connect the
UARTs to the system processor bus. See
paddle board block diagram" (page
baud rate generators, RS-232-C driver/receiver pairs, and the switches and
logic needed to configure each UART.
Figure 274
NT8D41BA QSDI paddle board block diagram
System considerations
In dual-processor Meridian 1 systems, the QSDI paddle board behaves
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.
Copyright © 2003-2008, Nortel Networks
.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Functional description 833
Figure 274 "NT8D41BA QSDI
833). Other logic on the card includes