The VLNC50, VLNC52, VLNC55, VLNC60, VLNC61, VLNC62, and VLNC64 circuit packs have similar mechanisms for synchronization. However, the VLNC50/52/55 has a ±20 ppm SMC/SEC clock whereas the VLNC60, VLNC61, VLNC62, and VLNC64 circuit packs have a ±4.6 ppm Stratum 3 clock. The VLNC50/52/55 supports deriving a T1/E1 sync output from the incoming line(s). The VLNC60, VLNC61, VLNC62, and VLNC64 circuit packs also have the ability to derive a clock, based on incoming data from a packet network. VLNC60, VLNC61, VLNC62, and VLNC64 circuit packs support external timing from an incoming T1/E1 BITS input.
Refer to Synchronization features for detailed information about the timing modes.
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