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Black Box Explains...DDS vs. T1.

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


Product Data Sheets (pdf)...T1/FT1 CSU/DSU Managed T1/FT1 CSU/DSUs



Product Data Sheets (pdf)...Communications Adapter Plus (CAP) User-Programmable Communications Adapter Plus (CAP)


Product Data Sheets (pdf)...Modem 34336


Product Data Sheets (pdf)...G.703 ClearChannel NTU G.703/G.704 NTU


Product Data Sheets (pdf)...Synchronous Modem Eliminator (SME-4M) for RS-232


Product Data Sheets (pdf)...Modem 32144


Product Data Sheets (pdf)...SmartNode 485


Product Data Sheets (pdf)...T1 WAN Access Router

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