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The differences between DPECL,PECL and LVPECL?

In the datasheet of TLK3118,the differential pair of REFCLKP and REFCLKN is noted on DPECL level, if  there is a clock oscillator outputs DPECL signal,I want to know what voltage the clock oscillator is,2.5V,3.3V or 5V?and are DPECL compatible with PECL or LVPECL?Thanks.