ABB UniGear Series, Engineering Manual

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Satellite reference clock
It synchronizes all connected devices using its reference time source. Optional accessories
usually are: antenna, antenna cable, antenna mount and lightning protection kit.
Recommended type of a compact substation clock, TTM 01-G manufactured by TEKRON, sup-
ports accurate GPS (USA) / GLONASS (Russian) clock with sub-microsecond timing that is
used to synchronize protection relays. Key features are:
– Synchronization of IEEE 1588-2008 (PTPv2) compatible clients via IEEE C37.238-2011 Power
Profile
– Synchronization of NTP and SNTP compatible clients
– 1x RJ-45 or 1x multi-mode fiber optic interface
Parallel Redundancy Protocol support for ultimate reliability is available in a fully customiza-
ble satellite reference clock NTS 03-G+ manufactured by TEKRON too.
Refer to www.tekron.com for additional information.
Figure 78: Example of satellite controlled clock from Tekron with optional accessories