Nortel Circuit Card, Installation Manual, Page: 682 / 908

Page 682 of 906 NT8D41BA Quad Serial Data Interface Paddle Board
553-3001-211 Standard 3.00 August 2005
• NT6D39 CPU/Network module
• NT9D11 Core/Network module
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 161 on
page 683 .
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 162 on
page 684 .