Mobile Computing: Port Replicators

Feature: Why You Need a Port Replicator

"Port replicator" is something that sounds like it came from the movie Blade Runner. In reality, it's simply a device that provides an easy way to connect peripheral devices to your notebook.

If you use a notebook as your primary computer, and need to take it on the road fairly often, then it's time to consider a port replicator. I suspect you're unwilling to take my advice at face value, however, and that you have questions. So let's tackle them.

What Is a Port Replicator, Exactly?

Though there are variations, a typical port replicator is a device containing common computer ports such as parallel, serial, PS/2, and USB. It may also include such features as an Ethernet controller and a headphone jack.

You connect your peripherals to the port replicator, rather than to the ports on your notebook, then connect your notebook to the port replicator. When it's time to dash out the door, just detach your notebook from the port replicator. Instead of disconnecting multiple devices from your notebook, you're unplugging only one--saving time and minimizing wear and tear on your notebook's ports.

Is a Port Replicator Like a Docking Station?

Generally speaking, a docking station does the same job as a port replicator. However, a docking station may also include slots for expansion cards, storage device bays, CD/DVD drives, and so on.

In essence, a docking station is designed to transform a notebook into a desktop computer. The smaller and lighter your notebook, the more likely you'll need a docking station. That's because the manufacturer had to leave a fair amount of features (such as a DVD-ROM/CD burner) out of the computer to make it so thin and light.

A port replicator is primarily meant to make connecting peripherals to your notebook more convenient.

Why Do I Need a Port Replicator?

Most computers have at least a few peripherals attached. For instance, my Dell notebook (which is the computer I use daily) hooks up to a multifunction printer, a four-port USB hub, a back-up hard drive, an external keyboard, an external trackball, and a flash memory card reader.

Granted, that's more devices than the average user probably needs. At a minimum, though, frequent notebook users should connect an external monitor (if their screen is less than 15 inches), an external keyboard and input device (for ergonomic reasons), and a printer.

Presumably, you're using a notebook rather than a desktop PC because it's portable. Do you really want to unhook all those devices every time you leave the office with your notebook? And reconnect them every time you return? Trust me: You don't.

Are There any Compatibility Issues?

Some port replicators and docking stations support multiple models from various manufacturers. The port replicator I bought years ago for my Dell Inspiron 3700, for instance, also works with my current Dell Inspiron 8100.

Many devices work with only one or a few specific notebook models, so make sure the device you're buying works with your notebook. Usually, if you're configuring a system online, you're automatically given the option to purchase a port replicator or docking station specifically for your device.

Where Can I Find One?

A number of third-party vendors, such as Kensington, Mobility Electronics, and Targus offer port replicators and/or docking stations. These devices are sometimes less expensive than what the computer makers sell and may be more convenient, too. I'll tell you more about that in a second.

I recommend beginning your search for a port replicator or docking station at your computer vendor's Web site. If for no other reason, it's good to know what your computer maker offers that fits your notebook, so you can compare its price and features against what you may find elsewhere.

Some sites to check:

PCWorld.com. With our Product Finder (powered by PriceGrabber.com's product pricing comparison engine), you can shop for docking stations and port replicators by notebook manufacturer.

Targus. This online retailer offers several compact and affordable port replicators. The most versatile is the Targus USB Mobile Port Replicator with Ethernet. The device includes two USB ports, two PS/2 ports, one parallel port, one serial port, and an Ethernet controller. It connects to notebooks via a USB port. And at 7.5 ounces, it makes a comfortable traveling companion. Current prices for the Targus USB Mobile Port Replicator with Ethernet begin around $59.

Mobility Electronics. Its EasiDock 1000EV CardBus Docking Station attaches peripherals to your notebook via a PC Card connector and includes integrated ATI video technology to drive two monitors (your notebook's and an external display) simultaneously. The device can support a variety of notebooks and includes two USB ports, two PS/2 ports, one parallel, one serial, an Ethernet controller, and (unlike the Targus port replicator described above) a monitor port. The device weighs 1.16 pounds.

For a list of compatible notebooks, go to the company's Web site. Current prices begin at $167; for the latest prices, check our Product Finder.

Food for Thought

In the long run, third-party port replicators and docking stations may deliver a better value than what notebook makers offer.

For instance, Dell's Advanced Port Replicator ($199) connects snugly to the Inspiron's back end, thereby blocking the notebook's parallel, serial, monitor, and USB ports. But the Targus and Mobility Electronics replicators, which connect to a notebook's USB and PC Card slots, respectively, don't block any of its ports: The notebook's own ports can still be used to add extra devices to your notebook.

Also, the Targus and Mobility Electronics devices can be connected to various notebook models--a plus for those who change notebook models fairly regularly. The Dell Advanced Port Replicator, by comparison, works only with most (but not all) Inspiron notebooks.

The drawback: Peripheral compatibility issues may arise when you use port replicators or docking stations. In that event, having purchased both your notebook and port replicator or docking station from the computer maker could make resolving the problem via tech support much less of a headache.