Physical Description; Functional Description - Avaya Nortel Communication Server 1000 Reference

NT8D41BA Quad Serial Data Interface Paddle Board

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
page 465.
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 149: NT8D41BA QSDI paddle board block diagram
464 Circuit Card Reference
Figure 148: NT8D41BA QSDI paddle board
Comments? infodev@avaya.com
on page 466.
on
July 2011