Cisco Systems 1721 用户手册

Ethernet hub

A hub connects pieces of network equipment (including the 
Cisco 1721 router) to create a network. You can use a 10-, 100-, or 
10/100-Mbps hub with the Cisco 1721 router.

Ethernet switch

A switch connects pieces of network equipment (including the 
Cisco 1721 router) to create a network. You can use a 10-, 100-, or 
10/100-Mbps switch with the Cisco 1721 router.

Phillips screwdriver

Although the WICs use thumbscrews, you might need a Phillips 
screwdriver to loosen the WIC slot cover.

Cisco WIC

In order to make a WAN connection, the Cisco 1721 router must 
have a supported WIC installed. The router supports up to two 
cards. You can order the cards when you order the router, and they 
will be installed for you. Or, you can order the cards separately, after 
you receive the router, and then install them yourself.

Straight-through RJ-45-to-RJ-45 
cable

This cable connects the router to the Ethernet LAN and connects the 
WICs to various WAN services, including ISDN, T1/FT1, and 
56-kbps services. You will need one cable for each connection that 
requires this cable type.

Serial cable

This cable connects a serial card to serial services. You must order 
this cable from Cisco. For detailed information about serial cable 
types, refer to the Cisco WAN Interface Cards Hardware 
Installation Guide, which comes with every card.

NT-1

Some ISDN service providers require a Network Termination 1 
(NT-1) device to connect an ISDN S/T port to the ISDN line.

Asynchronous modem

Connect a modem to the AUX port on the router when you want to 
configure the router from a remote location.