COURIER HIGH SPEED MODEMS
Reset the Jumpers
Figure 3.1 shows an enlarged view of the modem's jumper switches. If you hold the modem so that the rear panel is at the bottom and the edge connector is at the left of the circuit board you can locate the COM and IRQ jumpers near the center left side of the board.
Each jumper has two upright contacts connected by a black plastic piece, called a shunt, placed over the contacts for the COM2 and IRQ3 settings. This shunt selects the jumper by closing the circuit.
To change a jumper setting, gently lift off the black shunt and replace it over the contacts you want.
As we've said, your choice of an IRQ for COM3 or COM4 depends on your hardware/software configuration. If the device at COM1 or COM2 isn't using IRQ4 or IRQ3, you may use one of them. Otherwise, check your PC and software documentation to see if you may use IRQ2, IRQ5 or IRQ7.
WARNING: Do not select an IRQ position until you've read the previous guidelines and reviewed your software docu- mentation.
Figure 3.1⎯Jumper Switch/Serial Port Settings
Internal Modem Set Up
