Total Control Quad Modem Cards with x2™ capabilites include four U.S. Robotics V.Everything®/x2 modems per card, including error correction, data compression, fax and optional cellular support. The Total Control Chassis is the only system available that supports all high-speed data transmission protocols including the new optional x2 Technology, which is capable of speeds up to 56 Kbps. Rack mounted on a single chassis and managed from a single console, communications to and from the modem cards takes place via several high-speed buses over the mid-plane of the Total Control chassis. U.S. Robotics' suite of Quad Modem Cards supports connections to the PSTN via analog lines or digitally through Dual T1 or T1/PRI Application and Interface Cards. Typically, this data is directed from a Quad Modem Card to a Gateway Card, which then muliplexes the data onto an Ethernet, Token Ring or Frame Relay packet switched network. As an option, direct connections can be made via the Quad RS-232 Network Interface card.

Three modem types. The Total Control Enterprise Network Hub can be configured with specific modem types for different applications. Analog, digitial and analog/digital modems are available. Digital quad modems have the ability to utilize the digital PCM signal directly from the T1 or T1/PRI. This eliminates unnecessary multiple analog/digital conversions to minimize errors, connection times and costs. The dual mode analog/digital quad modems are capable of accepting either a digital or analog input signal from a T1 or the POTS (Plain Old Telephone System) to provide a solution for both forms of network access. All three modem types use U.S. Robotics state-of-the-art modem technology, and the digital and analog/digitial modem cards now support x2 Technology.

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