Appendix : Glossary 135

LRJ Location Reject—This is a call flow message.

LRQ Location Request—This is a call flow message.

MBP Management Bus Protocol—This protocol was developed by 3Com and is used in the NMC to communicate to the other cards in the Total Control chassis.

MFC Multifrequency Compelled—An E1 call setup protocol that requires the signals to be acknowledged.

MIB Management Information Base—A key element of SNMP management systems. A collection of objects that can be accessed via a network management protocol; holds information about all resources managed by a network management system.

NAC Network Access Card—the card in front of the Total Control chassis. It connects to the NIC in back. It allows the Total Control chassis to receive information from the NMC, then processes it and sends it out the NIC.

NANP North American Numbering Plan—The scheme used to identify the telephone trunks. It is composed of a three digit prefix and the four-digit suffix.

NDC National Destination Code—Used to identify a Public Land Mobile Network (PLMN) within a country.

NAC Network Application Card—In the Total Control chassis, this card is located in the front of the chassis. It allows communication to the VoIP application.

NIC Network Interface Cards—In the Total Control chassis, this card is located in the back of the chassis. It allows access to the network.

NMC Network Management Card—The NMC provides the management of all the cards in the Total Control chassis.

NLP Non-Linear Processing—Processing of a request for service that does not take the normal route as defined by the PSTN.

NMC Network Management Card—Manages all of the devices in the Total Control chassis under the direction of a PC running IP Telephony Manager software.

NSM Non-Standard Message—A type of non-standard message that is allowed by ITU T.30.

NTFS NT File System—The file system on Windows NT servers.

NTP Network Time Protocol—Protocol built on top of TCP that assures accurate local time-keeping with reference to radio and atomic clocks located on the internet. This protocol is capable of synchronizing distributed clocks within milliseconds over long time periods.

NVRAM Non-volatile Random Access Memory—Ram that retains its contents when a unit is turned off.

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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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