Physical Description - Nortel Circuit Card Installation Manual

Page 668 of 906

Physical description

553-3001-211 Standard 3.00
NT8D41AA Serial Data Interface Paddle Board
• NT6D39 CPU/Network module
• NT9D11 Core/Network module
The SDI paddle board is compatible with all existing system software, but can
only be used with the system options listed above. It does not support 20 mA
current loop interface.
The NT8D41AA 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 157 on
Up to two paddle boards 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 two serial ports on each card are
addressed as a pair of consecutive addresses (0 and 1, 2 and 3, up to 14 and
15).
The front edge of the card has two serial port connectors, an Enable/Disable
switch (ENB/DIS), and a red LED. The LED indicates that the card has been
disabled. It is lit when the following occurs:
• the ENB/DIS switch is set to disable
• both ports are disabled in software
• the ports are not configured in the configuration record
August 2005
page 669.