Nortel Networks 553-3001-211 manual Connector pin assignments, Rts

NT8D41AA Serial Data Interface Paddle Board Page 659 of 894

a socket in the CPU area of the backplane allows it to work only when that CPU is active.

The SDI 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 SDI paddle board can also be installed into a socket in the CPU area of the backplane. This is done when performing maintenance or an upgrade on the system. The SDI paddle board is plugged into the CPU that is not the active system CPU. One of the serial ports on the SDI 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 are brought out on connector J1 and the RS-232-C signals for port 2 are brought out on connector J2. The pinouts of J1 and J2 are identical, so Table 206 can be used for both ports.

Table 206

Connectors J1 and J2 pin assignments (Part 1 of 2)

Pin #	Signal	Purpose in DTE mode	Purpose in DCE mode
1	CD	Carrier detect (Note 1)	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	Ground	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