HP Vectra XU 6/XXX HP Vectra XU 6/xxx and VT 6/xxx PCs - Technical Reference M - Page 29

For the temporary storage of data received or awaiting transmission over the network, the A model has a 128 KB packet buffer. The B model has a 32 KB packet buffer. The new, enhanced demand priority access (DPA) protocol guarantees access to any end node that requests to transmit, while ensuring priority access to end nodes that require consistent, and thereby, continuous access for applications such as full-motion video or video conferencing. This protocol, through being collisionless with priority allocation, allows you to minimize unused capacity on your network, and so maximizes network throughput. The A model can be configured completely by software (no switches or jumpers need changing). The controller can be I/O mapped or memory mapped: the fastest mode is automatically selected by the driver. An HP provided driver needs to be installed within the operating system. The B model is I/O mapped, and has Bus-Master capability. The HP Vectra XU 6/xxx PC is supplied with a multi-protocol boot program integrated within the System ROM, and has a complete LAN client drivers and diagnostics package (Microsoft client, Novell client, IBM LAN server client and Warp connect, Banyans client, DEC pathworks client, all major TCPIP stacks, Lantastic). ERROR DIAGNOSTICS AND SUGGESTED CORRECTIVE ACTIONS Diagnostic software, in the form of a DOS utility called HPVGSet, is provided on the XU/VT Drivers and Documentation CD-ROM. The LAN administrator's guide (provided in ASCII, WINHELP and HTML format) is a useful source of further information. The HP 10/100 VG Selectable PC LAN Adapters Installation Guide (59632665) contains detailed diagnostic information. MASS-STORAGE DRIVES The SCSI and IDE controllers are described in chapter 2. The flexible disk controller is described in chapter 2. HARD DISK DRIVES A 3.5-inch hard disk drive is supplied on an internal shelf in some models of the HP Vectra XU 6/xxx PC and the HP Vectra VT 6/xxx PC. HP product number Manufacturer Product name Average seek time Revolutions per minute (RPM) Average latency Maximum transfer rate Read/write cache memory size Buffer size HP Vectra XU 6/xxx PC 2 GB SCSI 1 GB SCSI D2926A D2920A Seagate Quantum Barracuda 2LP ST32550N Fireball 1080S 10 ms 12 ms 7200 5400 4.2 ms 5.6 ms 10 MB/s 10 MB/s 480 KB 80 KB 512 KB 128 KB HP Vectra VT 6/xxx PC 2 GB IDE 1 GB IDE D2928A D2919A Seagate Quantum Cyclone ST32140A Fireball 1080AT 10 ms 12 ms 4500 5400 5.6 ms 5.6 ms 16.7 MB/s 16.7 MB/s 80 KB 256 KB 128 KB