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Download C TTC machine interface (TTCmi) User Manual
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3 Singlemode fibre from PCR Tx DC-coupled ECL O/Ps (Max 2 x 40) 88.924 µs LHC ORBIT Max attenuation 17 dB 0-3563 x 25 ns 40.08 MHz CLK GLOBAL ORBIT PHASE LEVEL 1 µs -20 dBm LHC ORBIT 1310 nm PIN + PREAMP READY TTCrx RST Optional TTCvi 40.08 MHz CLK SW REG BM ENCODER 80 ps Tx Optional encoded optical O/Ps 80.16 MHz OSC ÷2 Optional encoded electrical O/Ps Ø VCXO 160.32 MHz ÷4 7 ps LHC ORBIT PLL CD MONITOR Rx 40.08 MHz BC Clock (Square wave) 40.08 MHz CLK Fig. 3 TTCmi block diagram To compensate for the phase differences in the orbit signal received at different points around the LHC ring, the LHCrx incorporates a digital phase adjustment which allows the phase of the signal to be set throughout the 88.924 µs period in 3564 steps of the bunchcrossing interval of about 25 ns. The orbit output is a DC-coupled ECL negative-going 1µs pulse train, as this is the signal for which the TTCvi orbit input circuit was designed. The orbit signal is fanned-out as required by TTCcf modules in the TTCmi.
