SERVSWITCH™

By contrast, coaxial cables (required for XGA applications and recommended for most other applications) do much better at maintaining video quality, as shown in Table 4-3 below. (For the meaning of quality numbers 3, 2, and 1, see the bottom of the previous page.) As before, the distances in the table are total cable lengths measured from the CPU to the monitor. Also as before, the table assumes a single ServSwitch is between the CPU and monitor; if there is a submaster as well, video quality will always be lower.

Table 4-3. Video Quality vs. Distance for Coaxial Cables

Distance

10 ft.

20 ft.

30 ft.

50 ft.

75 ft.

100 ft.

150 ft.

200 ft.

Resolution

(3 m)

(6.1 m) (9.1 m)

(15.2 m)

(22.9 m)

(30.5 m)

(45.7 m)

(61 m)

 

640 x 480

3

3

3

3

3

3

2

2

800 x 600 noninterl.

3

3

3

3

3

3

2

2

1024 x 768 interlaced

3

3

3

3

3

3

2

2

1024 x 768 noninterl.

3

3

3

3

2

2

2

1

1280 x 1024 interlaced

3

2

2

2

2

1

1

1

1280 x 1024 noninterl.

3

2

2

1

1

1

1

1

CAUTION!

Some CPUs can’t drive or receive keyboard and mouse signals across longer runs of coaxial cable. Consult with the manufacturers of your CPUs before installing this cable in lengths greater than 20 ft. (6.1 m).

For CPU-to-monitor distances over 200 feet (61 m), Station Extenders or CAT5 KVM Extenders might be required. Call Black Box for technical support to discuss this option.

One last note of caution about video: The IBM 9515, 9517, and 9518 monitors that come with some PS/2 systems are not normal VGA monitors and require special cabling in order for video to be correctly sized and synchronized. Call Black Box for technical support if you want to use one of these monitors.

36

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Black Box SW725A-R4, SW722A-R4, KV3108SA-R4, SW721A-R4, SW724A-R4, SW723A-R4 Video Quality vs. Distance for Coaxial Cables
Page 58 Page 60

SW725A-R4, SW722A-R4, SW723A-R4, KV3108SA-R4, SW724A-R4 specifications

The Black Box SW721A-R4, SW724A-R4, KV3108SA-R4, SW723A-R4, and SW722A-R4 are cutting-edge network switches that cater to the demanding needs of modern data environments. These models are designed to provide high performance, reliability, and advanced features suitable for both enterprise-level deployments and smaller networks.

The SW721A-R4 and SW724A-R4 are primarily layer 2 switches that support essential networking protocols such as IEEE 802.1Q for VLAN tagging, ensuring secure and efficient traffic management. With robust forwarding capabilities, these switches boast high-speed Gigabit Ethernet ports, which enable seamless data transfer and reduce latency in data-driven applications. Their fanless design also ensures quiet operation, making them ideal for office settings and noise-sensitive areas.

Another noteworthy addition is the KV3108SA-R4, a versatile KVM switch that provides remote management capabilities. This model can control multiple servers and computers from a single console, allowing IT personnel to streamline operations and reduce physical space requirements. With support for high-resolution video output and an intuitive user interface, the KV3108SA-R4 enhances usability while maintaining efficiency in server management.

The SW723A-R4 and SW722A-R4 models further enhance network capabilities with their advanced Layer 3 functions. These switches support static routing and dynamic routing protocols, making them suitable for complex networking scenarios. They are equipped with a comprehensive set of security features, including port security and access control lists (ACLs), ensuring that sensitive information is well-protected against unauthorized access.

All of these Black Box models operate on advanced technologies such as QoS (Quality of Service), which helps prioritize critical traffic and ensures optimal performance during peak usage periods. Additionally, they support Power over Ethernet (PoE), enabling the powering of network devices such as IP cameras and VoIP phones without the need for additional electrical outlets.

In summary, the Black Box SW721A-R4, SW724A-R4, KV3108SA-R4, SW723A-R4, and SW722A-R4 represent a fusion of performance, versatility, and security in network infrastructure. These switches are perfect for businesses looking to enhance their connectivity solutions, ensuring that they can meet the demands of an increasingly digital world while maintaining high standards of efficiency and reliability.
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