Technical data

Chapter 4 63
PCI-SCSI Device Adapter Cards
PCI-SCSI Device Adapter Cards on HP e3000 N-Class and A-Class Systems.
A5149A - Single Port Ultra 2 SCSI (PCI bus) Adapter Card. This card plugs into a PCI
Bus on the system and presents a single SCSI Bus to the outside world. This SCSI Bus is
capable of operating in either LVD or SE Mode. This determination is made automatically
by the card based upon the devices and termination present on the Bus; there is no
software control for this feature. This bus must be terminated. Depending upon the
cables/connectors being used, this would typically be either a High Density (HD) 68-pin
LVD/SE terminator such as C2364A or, for Very High Density (VHDCI) 68-pin LVD/SE
cables, a C2370A. For details see “HP A5149A PCI to Ultra2 SCSI Host Bus Adapter
Service and User Guide.”
A5150 - Dual Port Ultra 2 SCSI (PCI bus) Adapter Card. (N-Class Only) This card plugs
into a PCI Bus on the system and presents two (2) independent SCSI Buses to the outside
world. These SCSI Buses are capable of operating in either LVD or SE Mode. This
determination is made automatically by the card based upon the devices and termination
present on the Bus; there is no software control for this feature. Each SCSI bus must be
independently terminated. Depending upon the cables/connectors being used this would
typically be either a High Density (HD) 68-pin LVD/SE terminator such as C2364A or, for
Very High Density (VHDCI) 68-pin LVD/SE cables, a C2370A. For details see “HP A5150A
Dual Channel PCI to Ultra2 SCSI Host Bus Adapter Service and User Guide.”
N-Class Core I/O Card. This card contains embedded versions of both an A5159A (Dual
Port) and an A5149A (Single Port). The A5159A portion of the Core I/O card supports the
two internal system disk slots - neither of these SCSI Buses are exported to the outside
(i.e. there is no way to connect external peripherals to these buses). The A5149A portion
of the Core I/O card presents a single LVD/SE bus for the connection of device(s) external
to the system (VHDCI 68-pin LVD/SE connector).
A-Class Core I/O Card. This card contains embedded versions of both the A5159A (Dual
Port) and a A5150A (Dual Port). The system uses one port from each card to support a
single internal disk and presents the other SCSI bus to allow the connection of external
SCSI peripherals. Path 0/0/1/0 (from the A5159A) is provided with a VHDCI 68-pin
LVD/SE connector. Path 0/0/2/0 (from the A5150A) is provided with a special HD 50-pin
SE connector; this connector only supports an 8-bit data path so only “narrow” SCSI
devices such as the DDS-3 Tapes may be connected.
SCSI Card Performance Limits and Device Connection Limits
(Primary source “A5149A PCI to Ultra2 SCSI Host Bus Adapter Service and User Guide”)
Table 4-1. SCSI Bus Widths and Speeds
SCSI Classification HP Card Id (signal type) SCSI Bus Width
(Bits)
Maximum Data Rate
(MegaBytes/Sec)
SCSI-1 HP28642A (SE) 8 5
Fast SCSI HP28696A (HVD) 8 10
Fast Wide SCSI “ 16 20
Ultra SCSI A4800A, A5159A (HVD) 8 20
Wide Ultra SCSI “ “ 16 40