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					Meet the Router
Interfaces
Video Transcript
                  Meet the Router Interfaces
                  Ray Moore
                  Professor
                  Gateway Community College
                  Length: 6:29

                              A router is a computer. Like any computer, we have to get commands and
                              information into it as well as getting information back out of it. Let’s take a look
                              at some interfaces on some different Cisco routers.
                              Cisco 2514
                              This is a Cisco 2514 router. Like all routers, we have to provide a keyboard to
                              type in commands. The console port, located here, allows us to hook up a
                              personal computer or a dumb terminal. The keyboard and screen of the computer
                              or terminal become the keyboard and screen of the router. The console port uses
                              a special rollover or console cable to connect from the computer or terminal to
                              the router.
                              Located next to the console port, is an auxiliary port, marked AUX. The auxiliary
                              port allows us to hook up a modem to the router. If we’re not in the same room as
                              the router, we can dial into the modem that’s attached to the auxiliary port and
                              enter the user name and password that we’ve set up. We can then type in
                              commands into a communications program, such as Windows HyperTerminal
                              and have them transmitted over the phone lines to the router at the other end.
                              Any information that the router displays in response to these commands is
                              displayed on the screens of the communications program. Great! Now we have a
                              way to communicate with the router.
                              The router is there to do a job – to select the best path to move the packets of data
                              on the LAN or WAN.
                              Here are the Ethernet ports of the router. The 2514 has two Ethernet ports
                              marked AUI 0 and AUI 1. Note that there is an LED, or Light Emitting Diode,
                              located next to the port. The LED blinks when there is activity on the port.
                              Different routers may have a different number of Ethernet ports.
                              The type of connection the Ethernet port uses is called an Attachment Unit
                              Interface, or AUI. The AUI port allows us to attach a transceiver to it. Ethernet
                              supports many different types of media, including thin coaxial, thick coaxial,
                              10Base-T, and fiber-optic.
                              By using an AUI, which provides a universal connection, we can accommodate
                              these different media types. We put a transceiver like this one on the AUI. If we
                              need to change our media type, we simply change the transceiver rather than
                              having to buy another router.
                              Ethernet is not the only type of LAN technology supported by routers. You can
                              buy routers that support FDDI, Token Ring, and other architectures. That takes
                              care of the Local Area Network, or LAN, connections, so let’s look at the WAN
                              connections.



1-2   Video: Meet the Router Interfaces                                             Copyright  2001, Cisco Systems, Inc.
                         The WAN, or Wide Area Network, connection lets the router communicate with the
                         outside world. These WAN connections, or ports, are usually serial connections. The
                         2514 has two serial ports labeled Serial 0 and Serial 1. And they are located here, next
                         to the console port.
                         We connect a V.35 cable like this one to the serial port. The other end of this cable is
                         connected to a CSU/DSU, which is in turn connected to the service providers WAN
                         communication line.
                         There are other types of WAN ports available like ISDN and ATM. Cisco makes
                         routers with these types of connections as well.
                         Cisco 1600
                         Let’s take a look at another model of Cisco router, the 1600. The 1600 is physically
                         smaller than the 2500 router, and is designed to support a smaller number of users.
                         The 1600 has a console port, but no auxiliary port. The 1600 has an Ethernet AUI port
                         as well as an Ethernet 10Base-T port that uses an RJ-45 type of connector. Note
                         however that both the 10Base-T port and the AUI port are labeled Ethernet 0. This
                         means you can only use one or the other type of connector, but not both at the same
                         time. Therefore, this particular model of 1600 router has just one functional Ethernet
                         port at any one time, depending on what type of connection you are using.
                         Next to it is a serial port marked Serial 0. This uses the same type of V.35 cable to
                         connect to a CSU/DSU.
                         The 1600 series has a special modular port located here. It’s called a WAN interface
                         card, or WIC. The WIC can be purchased in a variety of configurations including 56
                         Kilobit per second CSU/DSU, T-1 CSU/DSU, Basic Rate Interface ISDN, or another
                         serial port.
                         This modular approach, which is also available in the Cisco 1700, 2600, and 3600
                         series of routers, allows you to upgrade the WAN connection without replacing the
                         entire router. To use the WIC port, remove the protective cover, slide the WIC card in,
                         and secure it in place with the screws.
                         The 1600 and 2500 routers are considered access layer routers. They connect
                         workgroups or departmental LANs to a larger network.
                         Cisco 4000
                         Let’s take a look at an example of a distribution layer router, the Cisco 4000.
                         It still uses IOS, and supports the commands and protocols that you’re learning about in
                         your class. Let’s take a look at the interfaces on the 4000. Here’s the console port.
                         Here’s the auxiliary port. This particular Cisco 4000 has two high-speed serial
                         interface, or HSSI ports, and four Ethernet interfaces.
                         We typically hook the routers at the distribution layer together with faster LAN and
                         WAN connectors than we do at the access layer.
                         Cisco 7000
                         At the core layer, we have routers like the Cisco 7000. Core layer routers hook together
                         distribution layer routers.
                         The Cisco 7000 is larger, faster, and has more memory than the 4000, but it has many
                         of the same interfaces. Here’s the console port. Here’s the auxiliary port. And this
                         particular 7000 router has 24 Ethernet interfaces.



Copyright  2001, Cisco Systems, Inc.                                            Video: Meet the Router Interfaces   1-3
                              Now that you have seen a variety of Cisco routers, you can see that they have a
                              lot in common. They all have interfaces that allow us to connect to them as well
                              as having interfaces for LAN and WAN connections.




1-4   Video: Meet the Router Interfaces                                           Copyright  2001, Cisco Systems, Inc.