1904 - [ispClock 5400D] Are ispClock products suitable for ITU-T G.8262 applications?
No. Although ispClock products have excellent jitter specifications, the dynamics of their PLLs are very different from those used in data transmission applications (such as those based on ITU-T G.8262). The key difference is in PLL loop bandwidth. In a typical data transmission application, the PLL is used to synthesize a stable clock based on the potentially marginal clock recovered from received data. This requires low loop bandwidths, so the PLL doesn't respond to short-term fluctuations. In contrast, the ispClock family of devices have high PLL loop bandwidths (> 1 MHz), which allows them to lock onto a clock source very quickly, and also minimizes jitter. The high bandwidth also allows ispClock devices to rapidly track changes in the reference clock allowing for techniques such as spread-spectrum clocking.