Nortel Circuit Card 311 Reference page 811

The SDI paddle board is compatible with all existing system software, but
can only be used with the Meridian 1 system options listed above. It does
not support 20 mA current loop interface.
Physical description
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
SDI paddle board" (page
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:
•
•
•
Copyright © 2003-2008, Nortel Networks
.
the ENB/DIS switch is set to disable
both ports are disabled in software
the ports are not configured in the configuration record
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
812).
Physical description 811
Figure 266 "NT8D41AA