Nortel Networks Circuit Card 311 - Manual (Page 822)

822 NT8D41BA Quad Serial Data Interface Paddle Board
The QSDI paddle board is compatible with all existing system software, but
can only be used with the system options listed above. It does not support
the 110 baud rate or the 20 mA current loop interface.
Physical description
The NT8D41BA Quad Serial Data Interface paddle board is a printed circuit
board measuring 31.12 by 12.7 cm (12.25 by 5.0 in.). See
Figure 270
"NT8D41BA QSDI paddle board" (page 823) .
The QSDI paddle board can be used in a system backplane for a total of
four serial ports. Up to 12 other serial ports can be added by plugging
standard serial cards into standard system slots. The serial ports on the
card are addressed as a pair of consecutive addresses (0 and 1, 2 and 3,
up to 14 and 15), using switches SW15 and SW16.
The front edge of the card has four serial port connectors, an Enable/Disable
switch (ENB DIS), and a red LED. The LED indicates the card status. It is lit
when the following occurs:
• the ENB DIS switch is set to disable
• all four ports are disabled in software
• all four ports are not configured in the configuration record
Functional description
The NT8D41BA QSDI paddle board has four asynchronous serial ports.
These serial ports are connected to the I/O panel in the back of the shelf
using special adapter cables. The serial ports can be used to connect the
system to a terminal, a printer, a modem, or to an other system processor.
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
Figure 271 "NT8D41BA QSDI
paddle board block diagram" (page 824) .
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.