IT800 IT800Y CRC-16 - Datasheet Archive

Overview June 2008 Yitran Yitran CONFIDENTIAL 1 1 IT800 General Overview APPLICATION IT800 Implements the first three layers in

IT800 IT800 Overview June 2008 Yitran Yitran CONFIDENTIAL 1 1 IT800 IT800 General Overview APPLICATION IT800 IT800 Implements the first three layers in the OSI Model Physical Layer (PHY) activates and maintains the physical link between communication network systems. The PHY defines characteristics such as voltage levels, timing of voltage changes, physical data rates and transmission distances. PRESENTATION SESSION TRANSPORT NETWORK IT800Y IT800Y DLL PHYSICAL (PHY) OSI 7-Layers Network Reference Model Data Link Layer (DLL) provides reliable transit of data across a physical network link. The DLL defines different network and protocol characteristics, including physical addressing, error notification, sequencing of frames and flow control. Network Layer (NL) responsible for end to end packet delivery (routing). In addition to the routing functionalities, the Network Layer provides functions for node addressing and congestion control. Yitran CONFIDENTIAL 2 2 IT800 IT800 Overview PHY Features List DCSK Modulation (Yitran's patented Differential Code Shift Keying)- Spread Spectrum Modulation with 4 or 6 bit per symbol. Frequency diversity - 3 reception channels provide high immunity to interference. CRC-16 CRC-16 payload and FEC - mechanisms for additional reliability. Multiple Data Rate Modes - SM (DCSK6, 7.5Kbps), RM (DCSK4, 5Kbps) and ERM (DCSK4 with repetition code, 1.25Kbps in FCC/ARIB Bands. Yitran CONFIDENTIAL 3 3 IT800 IT800 Overview PHY Features List (cont.) Compliance - supports worldwide regulations (FCC, ARIB, CENELEC A & B). Cross Phase - Extremely high in-phase and cross-phase reliability (high dynamic range). Robustness - High immunity to signal fading, AWGN, spikes, impedance modulation, distortion and various of noise characteristics active on power line medium on the 10 400 KHz band. Clock recovery - algorithm for low accuracy low cost XTAL (150 PPM). Yitran CONFIDENTIAL 4 4 IT800 IT800 Overview PHY Signaling Long symbol duration (800usec FCC & ARIB, 1600usec CENELEC). IT 8 0 0 S y m b o l W a v e fo r m 3 Amplitude (Vp-p) 2 1 0 -1 -2 -3 0 1 0 0 2 0 0 3 0 0 4 00 5 0 0 6 0 0 70 0 8 00 T im e (u s e c ) Yitran CONFIDENTIAL 5 5 IT800 IT800 Overview DCSK Modulation Symbol 0 0000 1 2 3 4 5 6 7 8 9 10 11 1000 12 13 14 15 1111 Shifted Symbol 0 0000 Shifted Symbol 8 1000 Yitran CONFIDENTIAL 6 6 IT800 IT800 Overview PHY Performance Wide dynamic range (>90dB). High immunity to CW interference (SNR