Nortel Networks 553-3001-211 manual NT8D41BA Quad Serial Data Interface Paddle Board Page 673

NT8D41BA Quad Serial Data Interface Paddle Board Page 673 of 894

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 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 210 shows the pin assignment that applies to each connector.

Table 210

Connectors J1, J2, J3, and J4 pin assignments

Pin #	Signal	Purpose in DTE mode	Purpose in DCE mode
1	DCD	Data Carrier detect (Note 1)	Data Carrier detect (Not used)
2	RD	Transmitted data	Received data
3	TD	Received data	Transmitted data
4	DTR	Data terminal ready	Data terminal ready (Note 2)
5	GND	Signal Ground	Signal Ground
6	DSR	Data set ready (Note 1)	Data set ready
7	RTS	Request to send (Not Used)	Request to send (Note 2)

Circuit Card Description and Installation