before installing a wan interface card into the network module, turn off electrical power to the router to avoid the risk of electrical shock to yourself or to the equipment. to see translations of the warnings that appear in this publication, refer to the regulatory compliance and safety information document that accompanied this device.

    the following tools are required or recommended for this task:

    . esd-preventive wrist strap

    . number 1 phillips screwdriver

    . duct or electrical tape (for routers using a dc-input power supply only)

    step 1 turn off electrical power to the router. do not unplug the power cable. if the router uses a dc-input power supply, remove power from the dc circuit with the following steps:

    a. locate the circuit breaker on the panel board that services the dc circuit.

    b. switch the circuit breaker to the off position.

    c. tape the switch handle of the circuit breaker in the off position.

    step 2 remove all network cables, including telephone cables, from the rear panel of the router.

    do not install a newer isdn bri wan interface card in the same network module as an older isdn bri wan interface card. to identify the newer cards, look for a horizontal arrangement of channel b leds. older isdn bri wan interface cards have channel b leds that are arranged vertically.

    step 3 attach an esd-preventive wrist strap before handling the card, and connect the wrist strap to an electrical ground.

    step 4 using a number 1 phillips screwdriver, remove the blank filler panel from the base module slot. save the blank filler panel for future use.

    if you are installing a single wan interface card directly into the chassis, use slot w0 first. the router checks slot w0 before checking slot w1, so may not recognize the presence of the wan interface card in slot w1 if slot w0 is empty.

    step 5 align the card with the guides in the module slot and gently slide it in.

    step 6 push the card into place until the edge connector is seated in the connector on the module.

    step 7 using a number 1 phillips screwdriver, tighten the captive mounting screws.

    step 8 reinstall blank panels to fill any unoccupied module slots.

    to provide proper airflow, install the blank panels shipped with the router in any empty module or chassis slots.

    step 9 plug in the network interface cables and turn on power to the router. for a router using a dc power supply, remove the tape from the circuit breaker and turn the circuit breaker to the on position.