Nortel Networks Circuit Card 311 - Manual (Page 823)

Functional description 823
Figure 270
NT8D41BA QSDI paddle board
Other logic on the card includes baud rate generators, RS-232-C
driver/receiver pairs, and the switches and logic needed to configure each
UART.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
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.