SERVSWITCH™ JR. MP

4.3.5SEND NULL BYTE (PC CPUS WITH PS/2 MOUSE PORTS ONLY)

PS/2 type mice send control data to CPUs in three-byte increments. Sometimes, because of electronic transients, unusual power-up effects, or plugging and unplugging of cables from live equipment, the currently selected PC type CPU in a ServSwitch Jr. MP system can lose one or two bytes of this control information and get “out of sync” with the shared mouse. In this situation, the mouse might seem to refuse to move the pointer or cursor, open windows for no reason, or exhibit other strange behavior. To get the CPU back in sync, send this command to tell the Switch to send a “null byte” to the CPU’s PS/2 mouse port (this has no other effect than getting the CPU “caught up”). To issue the Send Null Byte command, press and release the left Control Key, then type [N].

If the mouse still isn’t right after you issue this command, the CPU must have been two bytes out of sync. Issuing the command again should do the trick.

The CPU will be thrown out of sync if it has a PS/2 mouse port and it’s in sync when you issue this command. Issue this command two more times to get it back in sync again. This command has no effect on Mac CPUs or on CPUs that are attached to the Switch through an RS-232 mouse port.

If you have version 9.01 or higher of the Microsoft mouse driver, the CPU should never get out of sync. Contact Microsoft if you would like to upgrade your Microsoft mouse driver.

4.3.6IDENTIFY ROM

Unfortunately, as with all complex equipment, problems might arise with your ServSwitch Jr. MP that require the assistance of technical-support personnel. One of the things technicians might want to know when they attempt to diagnose and correct your problem is the revision level of your Switch’s ROM. This command causes the ServSwitch Jr. MP to send the three-character “x.x” ROM level to the currently selected CPU as ASCII keyboard data; these characters will be echoed back to the shared monitor if you are at some type of prompt. (You must be at some kind of prompt or screen capable of displaying typed-in keyboard characters, or you will not see the Switch’s response.) To issue the Identify ROM command, press and release the left Control key, then type [I].

4.3.7KEEP SETTINGS

The Keep Settings command saves the current state of the ServSwitch Jr. MP’s keyboard-selectable settings to nonvolatile memory (NVRAM), where they become the new default (loaded at power-up) settings. To enter the command from your keyboard, press and release the left Control Key, then type [K]. The six keyboard- selectable settings are described in the next six sections.

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Black Box SW628A-R2, SW627A-R2 manual Send Null Byte PC Cpus with PS/2 Mouse Ports 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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