Appendix C

Hardware Options

Jumper Option Selection

Modem configuration is controlled by front panel pushbuttons and the LCD, AT or V.25 bis commands, and one hardware option jumper located on the PC board. Normally, jumpers do not have to be changed. If a change is required, remove the modem cover. The jumper diagrams on the following pages indicate the factory settings.

Removing the Cover

Warning

Disconnect power before removing the cover. Although dangerous voltage levels are not exposed, disconnecting power ensures an electrical shock hazard is not present.

1)Place the unit on its side on a flat surface.

2)To disengage the cover’s locks from the the base of the modem, insert a medium size flat screwdriver blade in one of the slots as illustrated in Figure C-1. DO NOT PUSH the screwdriver, but pry the lock open by applying pressure toward the unit.

3)Assist removal by pushing the cover from the base.

4)Repeat this procedure with the remaining three slots.

Modem 3600

C-1

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Black Box 3600 MODEM manual Appendix C Hardware Options, Jumper Option Selection