Nortel Networks Circuit Card User Manual

 Option settings

Some circuit cards contain option switches or jumpers, or both, that define 
specific functions. A switch or jumper can be identified by an alphanumeric 
coordinate (such as D29) that indicates a location on the card, or by a switch 
number (such as SW2) printed on the circuit board (see Figure 17). Positions 
on a switch (for example, positions 1, 2, 3, and 4 on SW2) are labeled on the 
switch block. 

On a circuit card:

•

ON may be indicated by the word “on,” the word “up,” the word 
“closed,” the number “1,” an arrow pointing up, or a solid dot (•).

•

OFF may be indicated by the word “down,” the word “open,” the number 
“0,” or an arrow pointing down.