Cisco 1721 - Manual (Page 37)

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Cisco 1721 Router Hardware Installation Guide
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Chapter 2 Installation
Installing WICs
Caution Do not connect a WAN cable to the card until you have completed the
installation procedure.
WIC Installation
This section describes how to install WICs in the router.
Installing the Cards in Correct Sequence
The Cisco 1721 router discovers interfaces on WICs installed in the WIC0 slot
before it discovers those installed in the WIC1 slot. This can affect your router
configuration. This section describes how to ensure that your existing router
configuration is not affected when you install WICs.
If you are installing a WIC in the router for the first time, install the card in the
WIC0 slot to ensure that your software configuration will not be affected if you
install a second card at a later time.
If you are installing a second WIC in a Cisco 1721 that has a card installed in the
WIC1 slot, follow this general procedure to prevent having to reconfigure your
router:
Caution Read the instructions in the following section, “ Installing the Cards ,” before
you install the cards.
Step 1 Remove the installed card from the WIC1 slot.
Step 2 Reinstall the card (removed in Step 1) in the WIC0 slot.
Step 3 Install the new card in the WIC1 slot.