Loading


Categories (x) > Datacom > Modems and CSUs (x)

Results 31-40 of 43 < 1 2 3 4 5 > 

Product Data Sheets (pdf)...Modem 32144



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)...T1 and T3 Rate Converters


Black Box Explains...DS-3 and DS-4

Digital signal (DS) speeds are used to classify the capacities of lines and trunks as designated by the Trunk (T) carrier systems. The most well-known T carrier system is the... more/see it nowNorth American T1 standard, which was originally designed to transmit digitized voice signals at 1.544 Mbps (DS-1). T carrier systems now carry digital data as well as voice transmissions.

DS-3 lines offer the functional equivalent of 28 T1 channels, operating at 44.736 Mbps (commonly rounded up to 45 Mbps). These lines handle up to 672 voice conversations and are used in high-speed interconnect and DS cross-connect (DSX) applications.

DS-4 offers 274.176 Mbps transmission—the same as 4032 standard voice channels—and has 168 times the capacity of T1. This performance level is generally used for carrier backbone networks.

Products offering DS-3 and DS-4 functionality comply with T3 and T4 standards, respectively, and with Bellcore GR-139-CORE specifications. collapse


Product Data Sheets (pdf)...9600 FP Modems


Product Data Sheets (pdf)...Modem 34336


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)...Micro NTUs

Results 31-40 of 43 < 1 2 3 4 5 > 
Close

Support

Delivering superior technical support is our highest priority. Depending on the products or services we provide for you, please visit your appropriate support area.



 
Print
Black Box 1-877-877-2269 Black Box Network Services