HP StorageWorks XP Direct Backup Engine Software - Manual (Page 19)

Backup solutions 19
Fibre-Channel Cable Connections
The Direct Backup Engine connections are the physical paths used by the
XP Disk Array to communicate with the backup devices. The XP Disk
Array and backup devices are connected via fibre-channel interface cables.
When fibre-channel interface (multimode shortwave) connections are
used, two switches are required for distances greater than 0.5 km (1,640
feet), and distances up to 1.5 km (4,920 feet, 0.93 miles) are supported.
When fibre-channel interface (single-mode longwave) connections are
used, two switches are required for distances greater than 10 km (6.2
miles), and distances up to 30 km (18.6 miles) are supported.