2.1.  SCX160 SCxbus Adapter Features

• 2.1.1.  Specifications

The SCX160 SCxbus Adapter converts internal SCbus TTL signals into external SCxbus RS485 type signals, and vice-versa, for communications between SCSA devices installed in up to 16 PC hosts. Each SCX160 SCxbus Adapter is assigned a unique node identification number.

The SCX160 SCxbus Adapter platform incorporates the following:

• 1024 channel multi-node single stage SCxbus interconnect that enables developers to run an application across multiple PCs (nodes)
• Switchless design that takes advantage of the inherent switching capabilities of the SCbus
• Standard Dialogic ISA bus host interface with Board Locator Technology (BLT) circuits
• SCxbus compliant interface with transceivers capable of connecting up to 16 nodes within an overall SCSI-3 cable length of 15 meters
• Node hot plugability, which allows a node to be attached to or removed from the SCxbus without corrupting live traffic or disturbing the entire system
• Controlled slip stream buffers
• Fault tolerant clocking, which provides robust network synchronization
• SCxbus dual clock scheme, which increases system available time
• Background diagnostics that continually monitor clock, frame and data integrity
• Fault reports when user-defined thresholds are exceeded
• Programmable interrupts
• A shared RAM interface

The SCX160 SCxbus Adapter supports the following:

• Quick access to board parameter information with the SCX160 InfoTool
• Downloadable parameter file
• SCbus and SCxbus time slot assignment under control of the Dialogic Service Startup program
• Data channels (time slots) where the full bandwidth is used for data transmission; no data bandwidth is wasted for synchronization, signaling, or administration tasks
• Real time diagnostics that run continuously
• Data stream blocking if the total time slot requirements of your multi-node system exceeds the 1024 time slot limitation of the SCxbus

At Dialogic Service startup the SCX160 SCxbus Adapter runs a start-up test program that verifies on-board functionality. The start-up test program executes the following tests:

• Memory test
• Program signature and CRC check
• Sanity check with the host computer

In addition to these diagnostics, the SCX160 SCxbus Adapter continuously monitors operations and reports alarms when they are software enabled and when user-defined thresholds are exceeded. Alarms are transmitted to the application to be handled by the application or the system administrator. Alarms report the following kinds of problems:

• Data transmission and reception integrity tests based on user-defined thresholds on both the SCbus and the SCxbus
• SCbus and SCxbus clock integrity
• Non-recoverable SCxbus or SCbus clock error
• Excessive slip: more occurrences than a user-defined threshold
• Loss of primary SCxbus clock
• Loss of SCbus clock
• Initiation of system clock recovery

2.1.1.  Specifications

The following table provides the technical specifications for the SCX160 SCxbus Adapter.

Table 1.  SCX160 Technical Specifications

Max. nodes/system	16
Resource sharing bus	SCbus and SCxbus
Control microprocessor	80C186
HOST INTERFACE:
Bus compatibility	IEEE P996 ISA compatible (IBM PC AT)
Bus speed	12.5 MHz maximum
Bus mode	Automatically configures to 8 or 16 bit transfer mode
Shared memory	32 Kbyte page
Base addresses	8000h, on 32K boundaries. All Board Locator Technology (BLT) boards share the same base address. Shared memory is page mapped in/out dynamically as needed.
Interrupt level	IRQ 2/9, 3, 4, 5, 6, 7, 10, 11, 12, 14, 15, software selectable. Only one IRQ line must be shared by all BLT boards.
I/O ports	None
POWER REQUIREMENTS:
+5 VDC -5 VDC +12 VDC -12 VDC	3.40 A max. 0.170 A max. 1.275 A max. 0.255 A max.
Operating temperature	0 _C to +50 _C
Storage temperature	-20 _C to +70 _C
Humidity	5% to 85% non-condensing
Form factor	PC AT, 13.3 in. long, 0.793 in. wide (total envelope), 4.5 in. high (excluding edge connector)
SAFETY & EMI CERTIFICATIONS:
United States	FCC Part 15, Subpart B, Class AUL: 1950 (E96804)
Canada	UL: CSA C22.2 No. 950
European Community	EN55022 Class B
World-Wide	For specific country approval designation, see the Dialogic International Approvals data sheet or contact a Sales Engineer.
Warranty	3 years standard

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