ack Box Modular Switches

Installation and User Guide (8/99)

∙NOTE – some NIC cards only auto-negotiate when the computer system that they are in is powered up. These are exceptions to the “negotiate at LINK – enabled” rule above, but may be occasionally encountered.

When operating in 100Mb half-duplex mode, cable distances and hop-counts may be mited within that collision domain. The Path Delay Value (PDV) bit-times must account for all vices and cable lengths within that domain. For Black Box LE14XXA-Series Fast Ethernet witched ports operating at 100Mb half-duplex, the bit time delay is 50BT.

5 Auto-negotiation for 10 Mb ports, half- or full-duplex mode

Full-duplex Ethernet provides separate Transmit and Receive data paths, enabling multaneous bi-directional collision-free data movements on a port. The network topology must a “star” type, not a “bus” type. With full-duplex mode, the cable distance is only limited by e physical layer line driver and cable attenuation. There are no collision-domain restrictions or mitations.

The LE14XXA-Series Switches perform half- or full-duplex mode auto-negotiation dependently on all switched ports. If the device or node on the other end of a port’s attached ble supports F/H mode auto-negotiation or is set to operate as full-duplex, the 4-Port Switch ill negotiate to run full-duplex. If the attached device or node doesn’t support F/H mode auto- gotiation (for example, if it is a 10 Mb repeater or a standard 10 Mb hub), the 4-Port -Switch’s J-45 ports will default to operate at half-duplex.

6 Flow-control, IEEE 802.3x standard

Black-Box LE14XXA- Series Switches incorporate a flow-control mechanism for Full- uplex mode. The purpose of flow-control is to reduce the risk of data loss if a long burst of tivity causes the switch to save frames until its buffer memory is full. This is most likely to cur when data is moving from a 100Mb port to a 10 Mb port, and the speed difference makes e 10Mb port unable to keep up. It can also occur when multiple 100Mb ports are attempting transmit to one 100Mb port, and in other protracted heavy traffic situations.

LE14XXA-Series Fiber Switches implement the 802.3x flow control (non-blocking) on ull-Duplex ports, which provides for a “PAUSE” packet to be transmitted to the sender when e packet buffer is nearly filled and there is danger of lost packets. The transmitting device is mmanded to stop transmitting into the 4-switch port for sufficient time to let the Switch

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Black Box Modular Switches Auto-negotiation for 10 Mb ports, half- or full-duplex mode, Flow-control, Ieee 802.3x standard
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LE14XXA, Modular Switches specifications

The Black Box LE14XXA series of modular switches are designed for high-performance networking in both small and medium enterprises, as well as in larger data center environments. These switches stand out due to their scalability, flexibility, and robust functionality, making them suitable for a variety of applications.

One of the main features of the LE14XXA modular switches is their modular design, allowing for the integration of various interface cards to tailor the switch to specific networking needs. This flexibility ensures that organizations can adapt their network architecture as requirements evolve, making it a future-proof investment. The switches support a range of modules, including Ethernet, fiber optics, and PoE (Power over Ethernet), which can be easily swapped out or added to support changing technology demands.

In terms of performance, the LE14XXA series offers impressive throughput capabilities, often supporting up to 10 Gbps per port. This speed is critical for businesses that rely on fast data transfer rates for tasks such as video conferencing, large file transfers, and real-time applications. The switches also feature advanced Layer 2 and Layer 3 functionalities, facilitating efficient data routing and switching, which is essential for maintaining effective network performance.

Security is another critical characteristic of the Black Box LE14XXA switches. They incorporate a variety of security protocols, including 802.1X port-based access control, VLAN support, and secure management interfaces, which help protect sensitive data and ensure compliance with industry standards. This makes them an excellent choice for organizations that prioritize data protection and regulatory compliance.

Ethernet redundancy protocols, such as Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP), enhance network reliability by providing failover options in case of link failures. Additionally, the LE14XXA switches feature energy-efficient designs that comply with energy-saving standards, which can significantly reduce operational costs over time.

User-friendly management interfaces, including a web-based GUI and command-line interface (CLI), simplify the configuration and monitoring processes. This ensures that IT administrators can efficiently handle the network without extensive training or experience.

Overall, the Black Box LE14XXA modular switches combine advanced technology, security features, and versatile design, making them a powerful choice for modern networking needs. Their adaptability and high performance offer businesses the capability to build scalable and secure networks that can grow alongside their operations.
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