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Orientation

One of the rack mounted units. The top unit shows a patch panel, the next one is a switch, and the lower two shows the routers.

This shows the 'rear-end' of a router. From left to right it is: ethernet transceiver, serial connection and console connection.

This shows two of the consoles which are used to program the routers. They connect using the RS-232 port on the PC, which connects to the RJ-45 console connector on the router. The console connection gives the default method of access to a router.

This shows a router and a hub. Notice that the connections are to the front of the hub, possibily to the patch panel.

This shows two routers, with a fibre optic to twisted-pair convertor. The output of this units connects into the switch.

The 'rear-end' of one of te routers, showing two twisted-pair transceiver units. Notice that there is a red stipe along the cable. We have used this to identify a 'cross-over' cable. Notice also the LED indicators that show the status of the transceiver unit.

Another 'rear-end' view of a router, showing two serial connections. These connections are used to connect over WANs.

These are the two connectors which connect to the console socket and the Ethernet socket on the router. Notice that they use the same connector, but one has a flat cable, while the other uses a standard Cat-5 cable (also notice the stripe down the cable, so that we can identify a cross-over cable). Remember that cross-over cables are used to either connect to twisted-pair network cards together as a peer-to-peer-type connection, or to interconnect between bridges, switches and routers.

This shows an optical transceiver unit. Notice that there are two connections on one side. One is for transmit and the other is for receive. It is often difficult to tell which one is which, this the status LED will go active when they are connected correctly.

This shows two of the transceiver units which connect to the router. One connects to an Ethernet connection, and the other to a fibre optic connection.