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DDS (Digital Data Service) is an AT&T® service that transmits data digitally over dedicated leased lines. DDS lines use four wires, and support speeds up to 56 kbps; however, DDS... more/see it nowis actually a 64-kbps circuit with 8 kbps being used for signaling. You can also get 64-kbps (ClearChannel™) service. Since the transmission is digital, no modems are needed. Dedicated digital lines are ideal for point-to-point links in wide-area networks.
T1 is a dedicated transmission line operating at 1.544 Mbps. It’s comprised of 24 DSOs, each supporting speeds of 64 kbps. The user sends data at N x 56 or N x 64 over T1 circuits. T1 operates over twisted-pair cable and is suitable for voice, data, and image transmissions on long-distance networks. collapse
• Midplane architecture—Separate front and rear cards make changing interfaces easy.• Multiple functions—Supports line drivers, interface converters, fiber modems, CSU/DSUs, and synchronous modem eliminators.• Hot swappable—MicroRACK Cards can be replaced... more/see it nowwithout powering down, so you cut your networks downtime.• Two-, four-, and eight-port MicroRACKs—available for smaller or desktop installations. Theyre just right for tight spaces that cant accommodate a full-sized (16-port) rack.• Optional dual cards—Some Mini Driver Cards have two drivers in one card. One MicroRACK chassis can hold up to 32 Mini Drivers!• All standard connections available—DB25, RJ-11, RJ-45, fiber, V.35.• Choose you own power supply—120240 VAC, 12 VDC, 24 VDC, or 48 VDC. collapse
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