HP 743 Series Technical Reference Manual For Oems page 30

AUI LAN
ment Unit Interface (AUI) version is used; no BNC connector is provided for ThinLAN. The
AUI connector enables connections to an external MAU using the HP A4303A adapter cable.
Table 1-15 summarizes the LAN AUI interface specifications.
Table 1-15 LAN AUI Specifications
Connector type
Controller
Data rate
Electrical interface
Type
Single-Ended SCSI
Series 700 products and supports 5 MB/sec data transfer rates.
The SCSI bus is terminated to 3.3 volts through 127 ohms on the system board. If the board
computer is used in a VME chassis having internal mass storage devices, all devices except
the last one must have their terminator removed. If an external disk drive is used, an active
terminator must be used on the last drive's uncabled connector.
Table 1-16 summarizes the specifications for the single-ended SCSI interface.
Table 1-16 Single-Ended SCSI Interface Specifications
Controller
Connector type
Data rate
Device limits
Maximum external
cable length
Type
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LAN circuits use the Ethernet/IEEE 802.3 standard interface. Only the Attach-
15-pin MDSM
Intel 82596CA compatible megacell
10 Mbits/sec
AUI
IEEE 802.3, Ethernet 1.0
The 8-bit single-ended implementation is compatible with the current
NCR 53C710 compatible macrocell, Rev D
SCSI-II, ALT-1 50-pin high-density thumbscrew
Asynchronous, 1.5 MBs/second
Synchronous, 5 MB/second
7 internal and/or external devices plus the host controller
4 meters (13.1 feet)
SCSI-II (ANSI X3.131-1986), 8-bit, single-ended
a.The board computer is the host controller.
Model 743 and Model 744 VME Board Computers
General Information
a
1-21