2 X 2 SCSI MATRIX SWITCH

5. Configuration and Operation

5.1SCSI Cable Interface Requirements

The 2 x 2 SCSI Matrix Switch can be installed at any point on the SCSI bus. Always use high-quality cables for optimum computer performance and reliability.

The SC121A differential switch contains 68-pin high-density connectors for up to 80-MB-per-second wide Ultra SCSI and Ultra2 SCSI computers and peripherals. The maximum cable distance should not exceed 82 ft. (25 m).

The SC120A-R2 single-ended/low-voltage differential switch contains 68-pin high-density connectors for up to 160-MB-per-second wide Ultra SCSI, Ultra2 SCSI, and Ultra160 SCSI computers and peripherals:

Low-Voltage Differential (LVD):

When operating with LVD devices, the SC120A-R2 supports 160-MBps wide Ultra160 SCSI computers and peripherals. The maximum cable distance for LVD should not exceed 82 ft. (25 m) total length.

Single-Ended (SE):

When operating with SE devices, the SC120A-R2 supports 40-MBps wide Ultra SCSI computers and peripherals. The maximum cable distance for SE should not exceed 20 ft. (6 m) total length.

Black Box offers standard and custom SCSI cables for connecting the SCSI Switch to host devices and peripherals. Call Black Box Technical Support for details.

5.2 Internal Terminator Selection

The SCSI Switch contains internal SCSI-bus terminators for each port. Termination is required at both ends of a SCSI bus for proper operation. Each port can have its internal terminator enabled or disabled from the front-panel display and keypad.

Refer to Figure 5-4 to select internal termination.

NOTE

Data errors will result if more than two sets of terminators are installed on any SCSI bus (see Figures 2-1 and 2-2).

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Black Box SC120A-R2, SC121A Configuration and Operation, Scsi Cable Interface Requirements, Internal Terminator Selection

SC121A, SC120A-R2 specifications

The Black Box SC120A-R2 and SC121A represent the cutting edge of industrial networking devices designed for robust performance and versatility in various environments. These devices are tailored for applications that require reliable data transmission, making them essential in modern automation and control systems.

One of the standout features of the Black Box SC120A-R2 and SC121A is their advanced serial-to-Ethernet conversion capability. This functionality allows users to connect legacy serial devices to Ethernet networks seamlessly. With support for multiple protocols, including TCP/IP and UDP, these converters ensure smooth communication between devices, regardless of their original architecture.

Both models are engineered to withstand harsh industrial conditions. They feature a rugged construction that includes high-quality enclosures designed for durability and protection against dust, moisture, and extreme temperatures. This resilience makes them ideal for use in factories, transportation, and other challenging environments.

In terms of connectivity, the SC120A-R2 and SC121A come equipped with multiple serial ports, enabling simultaneous connections to various devices. The auto-sensing capability of these ports simplifies installation and configuration, making them user-friendly for both technical and non-technical personnel. Users can easily manage and monitor connections through a straightforward web-based interface.

Additionally, these devices incorporate advanced security features, including encryption and authentication protocols, ensuring that data transmission remains secure from potential threats. This focus on security is crucial for industries where sensitive data is transmitted, enhancing overall system integrity.

The SC120A-R2 and SC121A also support a range of network configurations, allowing for flexibility in deployment. Their compatibility with various operating systems ensures that users can integrate them into existing systems without significant modifications.

Moreover, these models offer flexibility in power options, supporting both PoE (Power over Ethernet) and traditional power supply methods. This versatility enables easy installation without the need for additional power infrastructure.

Overall, the Black Box SC120A-R2 and SC121A are sophisticated networking devices that combine advanced technology with rugged design. Their ability to bridge the gap between legacy serial interfaces and modern Ethernet networks, coupled with robust features and security measures, makes them a valuable asset for numerous industrial applications. Whether in a manufacturing plant or a transportation hub, these devices provide reliable, efficient, and secure communication solutions that meet the demands of today's connected world.