This is a 3m (9.8ft) HP compatible stacking cable than can connect with HP 2920 series stackable switched to form a single unit. Our HP compativle data cables are specifically intended to work with HP switches, while also makintg it easy to allow switch additions, deletions and redeployment without interruption. Furthermore, you can use these data cables to stack up to four switches to become a single unit with one master switch.