About the CSX400

Firmware Data Compression

The STAC Electronics Stacker LZS Compression algorithm provides a minimum of 2:1 firmware data compression for the CSX400 over PPP and Frame Relay. Firmware data compression is supported in software on each WAN interface for line speeds of up to 256 Kbps. per WPIM, which is equivalent to four DS0 channels. To use data compression, compatible equipment, (such as the CSX400, CSX200, and HSIM-W6 or other vendors’ equipment which conforms to the applicable standards), must be in use at both ends of the WAN link. This firmware method of data compression is used as the default, if the hardware compression module is not installed.

Inverse Multiplexing (IMUX)

NOTE

Cabletron Systems products that support IMUX, such as the CSX400, HSIM-W6 and HSIM-4T1, must exist on both ends of the WAN link for the IMUX function to work.

Both bridging and routing functions are disabled when using the IMUX function.

Cabletron Systems Inverse Multiplexing (IMUX) feature provides enhanced throughput for users by doing each of the following:

•The IMUX function evenly distributes a data packet stream from the LAN interface through the two WAN interfaces on the CSX400. Since the data traffic is equally shared between the two Full T1 interfaces, each with 1.5 Mbps throughput, the total throughput over the logical link is 3 Mbps, or 6 Mbps full-duplex operation with the optional hardware compression module (CSX-COMP/ENCR) installed in the CSX400.

•The IMUX function passes packet sequence information over the WAN using the Point-to Point Protocol (PPP) and a WAN Encapsulated Ethernet Frame Type to support data coherency on both ends of the link.

•Data packet streams received by the WAN Interfaces on the CSX400 at the other end of the WAN link are then recombined, ordered, and transmitted to the Ethernet 1 interface.

•The IMUX function is fully configurable using QuickSET, which is discussed in the Bridging and Routing Configuration section of Chapter 7 and the MIB Navigator command set in Chapter 9.

10 CSX400 and CSX400-DC User’s Guide

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Cabletron Systems CSX400-DC manual Firmware Data Compression, Inverse Multiplexing Imux
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CSX400-DC, CSX400 specifications

Cabletron Systems was a leading developer of networking solutions, and its CSX400 and CSX200 series of high-performance switches represent some of the key innovations in the field of enterprise networking during their time. Both models were geared towards enhancing network reliability, efficiency, and speed, particularly in environments where heavy data traffic and complex networking demands were prevalent.

The CSX400, designed for larger enterprises, boasts a robust architecture capable of handling significant throughput. One of its standout features is its stackable design, allowing multiple switches to be interconnected and managed seamlessly as a single unit. This scalability provides organizations with the flexibility to expand their networks without significant infrastructure overhauls. The CSX400 supports various Ethernet standards, including 10/100 Ethernet and Gigabit Ethernet, positioning it to effectively manage both legacy and modern networking requirements.

In addition to its scalability, the CSX400 is distinguished by its advanced Layer 2 and Layer 3 routing capabilities. This dual-layer functionality enables efficient data handling and is instrumental in managing traffic between different network segments. Moreover, the switch incorporates features like VLAN (Virtual Local Area Network) support and Quality of Service (QoS) prioritization, allowing for enhanced performance of critical applications and streamlined bandwidth allocation.

On the other hand, the CSX200 series is tailored for smaller enterprises or branch offices needing a reliable yet efficient networking solution. Despite its compact design, the CSX200 is equipped with essential features that promote effective network management and security. It offers a simplified management interface, making it user-friendly for network administrators. The switch also provides essential access control measures, employing technologies like IEEE 802.1X for network access security.

Both the CSX400 and CSX200 prioritize performance through the incorporation of advanced switching technologies. They support features such as Spanning Tree Protocol (STP), enabling loop-free topologies and enhanced network resilience. These attributes are particularly crucial in dynamic networking environments where downtime can have significant repercussions on business operations.

Overall, Cabletron Systems' CSX400 and CSX200 series represent a blend of scalability, advanced routing capabilities, and user-friendly management, making them vital assets for organizations looking to optimize their network infrastructure during a period of rapid technological evolution. With their rich feature sets and unwavering performance, these switches helped pave the way for modern networking solutions that cater to diverse enterprise needs.
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