Digital I/O Bit Synchronizer

The Model 270 Multi-Channel Digital I/O Bit Synchronizer is a compact, high-performance device designed to extract usable digital data and provide an output clock from serial digital input streams. Available in 8 or 16 channel configurations, the Model 270 features both TTL and RS-422 inputs/outputs. The unit supports programmable loop bandwidths from 0.05% to 1.6% and can achieve signal acquisition in as few as 40 bits. It maintains synchronization for at least 128 bits in the absence of transitions and tracks signals up to 15% of the input rate at the widest loop bandwidth.

Encoded data streams, including IRIG-106 Randomized data, are decoded to their native form, accommodating both forward and reverse sequences. An optional Frame Pattern Detector enhances synchronization by detecting patterns up to 64 bits long, while the Automatic Polarity Correction (APC) mode ensures correct data output polarity. For changing input bit rates, the optional Auto Bit Rate Scan can automatically lock onto one of up to 8 programmed bit rates, input codes, and synchronization patterns. Front panel status displays provide real-time information on selected bit rates and deviations.