HP Visualize c360 PA-RISC Visualize Workstation Universal Serial Bus - Page 13

USB Alternatives Attribute USB IEEE-1394 async SCSI sync SCSI Ports per host Open (2 typ.) Typ. 1...4 Open (1 typ.) Open (1 typ.) Pin count 4 6 50 50 or 68 Cable segment length 5m 4.5m 6m varies (single-ended) Max. transparent distance Topology 30m Tiered-Star 72m Unlimited w/repeaters Unlimited w/repeaters Tiered-Star Parallel Bus Parallel Bus Device-to-Device I/O? No Hot attach/detach Yes Yes Theoretically Theoretically Yes No No Device power Bus or Local Bus or Local Local only Local only Power available Power management 100 to 500 mA per port Yes 1.5 A / port Yes N/A Only recently N/A Recently Devices/port controller 127 63a 7 7 or 15 Device enumeration Peak transfer rate All 1.5 MB/s All 50+ MB/s Mostly 1.5 MB/s Usually 80 MB/s Error control Flow control CRC CRC Packet re-send Packet re-send Parity Handshake Parity Handshake a. Bus-to-bus bridges permit transparent access to over 60,000 nodes.