The Data-over-Cable Service Interface Specification (DOCSIS)is an international standard developed by CableLabs, a non-profit research and development consortium for cable-related technologies. • DOCSIS specifies the OSI Layer 1 and Layer 2 requirements: Physical layer-For data signals that the cable operator can use, DOCSIS specifies the channel widths (bandwidths of each channel) as 200 kHz, 400 kHz, 800 kHz, MHz, MHz, and MHz. DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data). MAC layer-Defines a deterministic access method, time-division multiple access (TDMA) or synchronous code division multiple access method (S-CDMA)
