Nortel Networks Circuit Card 311 - Manual (Page 834)

834 NT8D41BA Quad Serial Data Interface Paddle Board
The QSDI paddle board is normally installed into a socket in the network
area of the backplane. This allows it to be accessed by either of the
system processors. This is necessary because the active CPU switches
automatically each night at midnight and whenever a fault occurs on the
active CPU card.
The QSDI paddle board can also be installed into a socket in the CPU area
of the backplane (supported in NT6D39AA shelves only). This is done when
performing maintenance or an upgrade on the Meridian 1 system.
The QSDI paddle board is plugged into the CPU that is not the active system
CPU. One of the serial ports on the QSDI paddle board is then connected to
a maintenance terminal and the CPU board is put into maintenance mode.
Diagnostics can then be run from the maintenance terminal without having
to stop the system. This is also used to perform a parallel reload of the
system software without affecting the operation of the switch.
Connector pin assignments
The RS-232-C signals for port 1 through port 4 are brought out on connector
J1 through J4 respectively. The pinouts for each port are identical to those
for each of the other three ports.
Table 326 "Connectors J1, J2, J3, and
J4 pin assignments" (page 834) shows the pin assignment that applies to
each connector.
Table 326
Connectors J1, J2, J3, and J4 pin assignments
Pin # Signal Purpose in DTE mode Purpose in DCE mode
1 D
C
D Data Carrier detect (Note 1) Data Carrier detect (Not used)
2 R
D Transmitted data Received data
3 T
D
Received data Transmitted data
4 D
T
R
Data terminal ready Data terminal ready (Note 2)
Note 1: In DTE mode the signals CD, DSR, and CTS are tied to +12 volts to signify that the port on
the QSDI paddle board is always ready to transmit and receive data. This mode is set to connect
to a terminal device (DTE).
Note 2: In DCE mode the signals DTR and RTS are tied to +12 volts to signify that the port on the
QSDI paddle board is always ready to transmit and receive data. This mode is set to connect
to a modem device (DCE).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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