FireWire Depot announced the release of an isolator cable for FireWire 800 connections. The 1394b FireWire Isolator cable allows you to hot-swap devices as it does not pass buss power. In addition, FireWire Depot noted that it can be used to find out bad cables in a FireWire chain.
The cable is intended to prevent charges from bad cables travelling up a FireWire chain by simply not passing any bus power through to devices. The FireWire spec provides bus power so that (some) devices do not need an external power supply, but a bad cable can ruin a device.
The cable is a 9-pin male to 9-pin female cable, 9" long. The company said it is intended to be used in conjunction with another FireWire cable.
The 1394b FireWire Isolator cable
You can find more information on the product at FireWire Depotis Web site. The cable is priced at US$32.