Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario

 NT8D41AA Serial Data Interface Paddle Board

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.

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. 

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)