CHAPTER 4: Operation

4.3.8 SET MAXIMUM PORTS (SW628A-R2 ONLY)

Use this command to tell a 4-port ServSwitch Jr. MP the total number of CPU ports to which computers are or will be connected. This allows the scan function to cycle correctly if you have computers attached to only two or three of the Switch’s CPU ports. To issue the Set Maximum Ports command, press and release the left Control Key, type [P] followed by the total number of ports accessible to that Switch ([2] or [3]), and press [ENTER]. To save a new Maximum Ports setting, you must issue a Keep Settings command.

4.3.9SET SCAN-DELAY TIME

Issue the Set Scan-Delay Time command to set how long, in seconds, the ServSwitch Jr. MP will pause at each of the CPU ports when it’s scanning them. The factory-default setting is 5 seconds. To set a different delay time, press and release the left Control Key, type [T] followed by the new delay time in seconds (1 to 15), and press [ENTER]. (If you issue this command with an argument of zero, the ServSwitch Jr. MP will set the scan-delay time to the default value most recently saved in NVRAM.) Enter the Keep Settings command after you enter this command.

4.3.10SET KEYBOARD MODE (PC CPUS ONLY)

Keyboard “modes” are electrical signaling protocols that determine how a powered PC type CPU and keyboard interact. A CPU and keyboard must use the same mode in order to work with each other. Of the three standard keyboard modes currently in use, mode number 2 is the one used by the vast majority of PC CPUs. It is also the default state of all 101-key and PS/2 keyboards. Mode 1 is used primarily by certain PS/2 CPUs. Mode 3 is used by RS/6000® CPUs, some other UNIX® based computers, and certain specialized servers.

The ServSwitch Jr. MP supports all three of these modes: As it receives signals from one of the keyboards, it sends them to the currently selected PC CPU by emulating a keyboard of the appropriate mode for that CPU; as it receives signals for one of the keyboards from the currently selected or scanned CPU, it sends them to that keyboard by emulating a CPU of the appropriate mode.

Most CPUs that use keyboard mode 1 or 3 send a “mode command” to the keyboard at power-up, to put the keyboard in the proper mode. A ServSwitch Jr. MP can use these commands to automatically detect each such CPU’s keyboard mode when you turn on the CPU after it has been cabled to the Switch. However, the Switch doesn’t automatically save this value; unless you send it a Keep Settings command, it will forget the modes it has detected when it is powered down, then default to each port’s most recently saved setting when it’s powered up again.

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Black Box SW627A-R2 manual SET Maximum Ports SW628A-R2 only
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SW627A-R2, SW628A-R2 specifications

The Black Box SW627A-R2 and SW628A-R2 are advanced network switches designed to enhance the efficiency and reliability of modern data networks. These switches are ideal for various applications, including data centers, enterprise networks, and industrial settings, providing robust performance and flexibility for a wide range of tasks.

The SW627A-R2 model features 24 Ethernet ports, allowing for seamless connectivity across a broad array of devices. Its 10/100/1000 Mbps auto-sensing capabilities ensure that all connected devices can communicate effectively, making it an excellent choice for businesses looking to maximize their existing infrastructure. The switch is designed with energy efficiency in mind, featuring IEEE 802.3az Energy Efficient Ethernet technology. This integration helps in reducing power consumption and minimizing operational costs without compromising performance.

On the other hand, the SW628A-R2 model takes things a step further by offering 48 ports, accommodating even larger networks with ease. This switch also supports Power over Ethernet (PoE), which allows it to deliver power to connected devices such as IP cameras, VoIP phones, and wireless access points, eliminating the need for additional power sources and simplifying network installation.

Both models support Layer 2 switching and feature advanced forwarding techniques such as store-and-forward and cut-through modes. They also come equipped with a user-friendly interface for easy configuration and management, with options for SNMP monitoring to ensure optimal performance and troubleshooting capabilities.

From a security perspective, both the SW627A-R2 and SW628A-R2 incorporate features such as VLAN support, port security, and access control lists (ACLs). These features help in segmenting network traffic, preventing unauthorized access, and enhancing overall network integrity.

In terms of durability, both switches are designed for robustness, with sturdy enclosures suitable for various environments. The fanless design also ensures silent operation, making them suitable for office settings.

Overall, the Black Box SW627A-R2 and SW628A-R2 network switches are designed to meet the demands of advanced networking environments, providing the necessary features and technologies to facilitate efficient, secure, and scalable operations. Whether for a small business or a large enterprise, these switches provide a reliable backbone for any network infrastructure.
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