They can communicate with the proper adapter, but probably not the way you are envisioning. As mentioned in the comments, the RJ45 connector on your cable is not connected the same as an Ethernet RJ45 connector. This would be considered a null-modem connection. You will need the appropriate DB9-to-RJ45 modular connector to get standard connections on both ends. Next, you will probably need some USB to RS-232 adapters unless your computer still has built-in COM ports. Even still, you will only be able to communicate using RS-232 serial communications. You would need some sort of terminal emulator software on both computers. IP-based programs actually can communicate over these cables using the good old 1988 technology of SLIP or its replacement, PPP. This used to be a fairly common way to provide networking to simpler equipment, back when NICs were expensive. Due to the limits of RS-232 serial connections, be aware that your maximum throughput will literally be about 10,000 times slower than a gigabit Ethernet crossover cable. So, it can be done, but it probably shouldn't be done. This information provides cable and port specifications to aid your planning efforts. The following sections provide detailed information.
 Every Cisco router/network switch has a console port on its back. It is there to provide a way to hookup a terminal to the router in order to work on it. The console port (sometimes called the management port) is used by administrators to log into a router directly — that is, without a network connection. The console must be used to install routers onto networks because, of course, at that point there is no network connection to work through. Connecting the Console Port to a PC
Console (rollover) Cable and Adapters The console cable can be:
Making the physical connection Follow these steps to connect the Router/Switch to a terminal or PC running terminal emulation software: Step 1 Locate the console port on the back of the Router/Switch. Step 2 Connect the console (or rollover) cable to the console port on the Router/Switch. Step 3 Use the correct adapter to connect the other end of the cable to your terminal or PC. Step 4 If your terminal or PC has a console port that does not fit one of the adapters, you must provide the correct adapter for that port. Connecting using HyperTerminal Click on the HyperTerminal icon below to launch a pre-configured HyperTerminal connection. This connection is configured for use with all Cisco Router/Switches. (The Router/Switch should be connected to your laptop at this time. Depending on your browser settings, you may initially see a message asking whether you want to open the file or save it to disk. To launch the connection now, select the “open” option. To save the connection to your local hard-drive for future use, select the “save” option. If you selected the “open” option, you should now be communicating with the Router/Switch. If you are experiencing problems, make sure the Router/Switch is powered on; you are attached to the proper Com Port and verify your cabling. Setting up a HyperTerminal connection file Using this procedure you will create a named connection that you can save and reuse. (This creates a connection identical to the one provided above, and is included primarily for your reference.) To set up a HyperTerminal connection on your laptop: Step 1 Click the Start button on the Windows Taskbar, and select Programs > Accessories > Communications > HyperTerminal. HyperTerminal launches and displays the Connection Description dialog box. Alternatively, if you previously saved a connection for Cisco equipment, you can launch it by selecting Programs > Accessories > Communications > HyperTerminal > connection_name. Step 2 Type in a name and optionally select an Icon to represent your HyperTerminal session. Click OK. The Phone Number window appears. Step 3 Locate the Connect Using field near the bottom of the Phone Number window. Select “Direct to COM1” from the drop-down list to indicate that this connection is a local session (and not a dial-up session). Click OK. The COM1 Properties window appears. Step 4 On the Port Settings tab, enter the following settings:
Step 5 Click OK to make the connection. The COM1 Properties window disappears. You should now see a blinking cursor in the HyperTerminal terminal window. If there are any problems at this point, then see below the Troubleshooting console port problems to isolate and fix the problem. Troubleshooting console port problems SYMPTOM: No connection.
SYMPTOM: No response from Router/Switch once connected to Router/Switch via console.
SYMPTOM: Only getting garbage from the Router/Switch. Ensure HyperTerminal is setup using the correct speed — 9600 Baud. References: Cabling Guide for Console and AUX Ports Guide: Using the Cisco Console in Linux
Console cables — also known as Cisco cables, rollover cables and management cables — are designed for a specific purpose. They connect Cisco networking devices to terminals or PCs for configuration. Typically, the Cisco end will connect via RJ45, and the terminal end will conclude in a serial connection. What matters most about console cables is the specific nature of the connection. This is not an Ethernet or networking connection. It is a terminal connection, and its purpose is to enable the connected computer to configure the networking device. This is true for older Cisco equipment and brand-new devices. Configuration is performed through the serial connection. What Are the Primary Kinds of Console Cables? Console cables come in many shapes and sizes and with a variety of connector types. There are three that are used more commonly than the rest, mostly because of the frequency with which you will see these different connectors. RJ45 to DB9 A RJ45 to DB9 is probably the most well-known console cable today. Once upon a time, console cables were connected with improvised “kits” that were little more than a string of adapters on the end of a serial cable. Today, you can get an RJ45 to DB9 cable that replaces the “kit” with a single cord. As the name implies, one end is RJ45 and the other is DB9. This is the most direct serial connection available, and it comes packaged with a wide variety of Cisco devices. It’s something of a standard, but despite that, it’s designed to communicate with terminals that have the DB9 port. If you want to connect it to a PC or laptop, you’ll likely need an additional adapter between the DB9 end and your USB port. USB A to Mini-B Another common console cable, the CAB-CONSOLE-USB, connects the USB on a terminal to a mini-B port on the Cisco device. You’ll notice the lack of RJ45 connectors. This is a specialized cable that services smaller, often portable devices. Despite the connection pieces, this is still a "serial" cable that enables terminal communication. USB to RJ45 The CAB-CONSOLE-USB-RJ45 is arguably the most modern console cable. It ditches the less-used DB9 connector and streamlines your communication. It goes seamlessly from the console port on the Cisco device to a standard USB port on a PC. It’s the simplest way to create a terminal connection with modern equipment, and it is not a standard inclusion in Cisco hardware packages. A handful of these cables can make network control substantially faster and easier. That is what you need to know about console cables. In the past, networking staff had to waste valuable time finding creative ways to bridge connections and configure devices. With modern console cables, that time is saved and networking is that much easier. |
Which type of cable is used when connecting a console port on a switch or router to a PCs serial RS 232 port?
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