132APPENDIX : GLOSSARY

DRAM Dynamic Random Access Memory—The readable/writable memory used to store data in PCs. DRAM stores each bit of information in a "cell" composed of a capacitor and a transistor.

DRJ Disengage Reject—This is a call flow message.

DRQ Disengage Request—This is a call flow message.

DS Digital Signal—Standard specifying the electrical characteristics for data transmission over four-wire telco circuits. DS1 is 1.544 Mbps, and DS3 is 44.736 Mbps. Also referred to as T1 and T3.

DS0 1. Digital Signal level zero—It is equivalent to one voice conversation digitized under PCM. It transmits digital signals over a single channel at 64-kbps on a T1 facility 2. Data Slot 0

DSP Digital Signaling Processors—A special computer chip designed to process digital signals that were originally analog signals.

DSR Data Set Ready—This is a call flow message.

DTE Data Terminal Equipment—End-user equipment, typically a terminal or computer, that can function as the source or destination point of communication on the network.

DTMF Dual Tone Multi-frequency—The sounds a touch-tone telephone makes when its keys are pressed.

DTR Data Terminal Ready—A control signal that is activated to let the DCE know when the DTE is ready to send and receive data.

DTS Data Transformation Service—Technology designed for bypassing functions for short-hop, line-of-sight applications. It never converts to analog. Its main use is in high volume, data only applications in urban areas where line costs are higher.

ECC Error Correcting Code—Code that determines whether line noise has caused data to be garbled or dropped in transit, and then works to correct the problem. The two most common error-correction protocols and standards used by analog modems are MNP and V.42.

EdgeServer Pro Card This card on the Total Control Chassis runs Windows NT 4.0 Server, provides two 10/100-Mbps ethernet interfaces, and routes call over IP networks.

Edge server card This card on the Total Control Chassis runs Windows 2000 Server, provides two 10/100-Mbps ethernet interfaces, and routes call over IP networks.

EDO RAM Extended Data Out Random Access Memory—A more efficient method to access memory. It reduces access memory time by 10% over the standard DRAM chips.

EIA Electronic Industries Alliance—A trade organization who sets standards for electronics.

EMC Electromagnetic Compatibility—The ability of a device or system to function without error in its intended electromagnetic environment.

EMI Electromagnetic Interference—The leakage of radiation from equipment.

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3Com 5210 manual Appendix Glossary
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5210 specifications

The 3Com 5210 is a robust and reliable networking switch designed to meet the demands of modern IT environments. Aimed at businesses looking for a balance of performance and manageable costs, the 5210 series provides essential features that cater to the needs of various industries.

One of the standout features of the 3Com 5210 is its support for high-performance switching. With a switching capacity of up to 104 Gbps, the device is built to handle a significant amount of data traffic, making it suitable for environments with heavy workloads. Coupled with a forwarding rate of 77.4 million packets per second, the 5210 guarantees minimal latency, ensuring that data is transmitted swiftly and efficiently across the network.

The 5210 switch supports Layer 2 and Layer 3 switching, allowing for flexibility in network design and operational efficiency. The Layer 3 functionality enables IP routing, facilitating better traffic management and segmentation across IP networks. This is particularly useful for organizations looking to optimize their network performance and ensure efficient load distribution.

In terms of security, the 3Com 5210 incorporates advanced features designed to protect enterprise networks from potential threats. The switch supports VLANs, which help in segmenting network traffic, along with port security features to minimize unauthorized access. Moreover, it provides access control lists (ACLs) that allow administrators to define rules for data transmission, enhancing overall security.

The device is also equipped with Quality of Service (QoS) capabilities, which prioritize different types of traffic to ensure that critical applications receive the bandwidth they require. This is crucial for businesses that rely on voice over IP or video conferencing, as it ensures clear and uninterrupted communication.

Management and monitoring are simplified via a user-friendly web interface, allowing network administrators to configure settings, monitor traffic, and troubleshoot issues easily. The switch supports Simple Network Management Protocol (SNMP), enabling remote management and ensuring that IT teams can respond to problems without being physically present at the location.

The 3Com 5210 is characterized by its reliability and durability. Built with robust hardware components, the switch is designed for continuous operation, suitable for both small offices and larger enterprise networks. With its combination of performance, security, and manageability, the 3Com 5210 stands out as a valuable asset for organizations aiming to enhance their networking capabilities.
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