2-6
Installing 650 Series Hardware
Cabling the 650 Series
Changing the
Modem Strapping
The default setting for the modem strapping is in 4-wire mode. If you need to change
the modem support from the default 4-wire position to the 2-wire mode, you must
perform the following steps:
1)
Locate the J10 strap on the modem card.
2)
Remove the blue jumper by sliding it up, off of the pins that specify 4-wire mode
(see Figure 2-4).
3)
Carefully slide the jumper over the pins that specify 2-wire mode. The pins for
2-wire mode are to the left of the default 4-wire position when facing the card as
oriented in the figure.
Figure 2-4 shows the strapping positions for 2-wire and 4-wire modes.
Figure 2-4. 4-Wire and 2-Wire Modem Strapping Positions
J10
2W
4-Wire Mode
4W
J10
2W 4W
(Default)
2-Wire Mode