Transient Protection On Communication Ports; Precision Time Protocol (Ptp) Card - RuggedCom RuggedRouter RX1000 Family Installation Manual

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Communication Ports

4.9 Transient Protection on Communication Ports

RuggedCom does not recommend the use of copper cabling of any length for critical

real-time substation automation applications. However, transient suppression

circuitry is present on Twisted-Pair Ethernet Ports & Serial ports to protect against

damage from electrical transients and to ensure IEC 61850-3 and IEEE 1613 Class 1

conformance. This means that during a transient event, communications errors or

interruptions may occur but recovery is automatic.

RuggedCom also does not recommend the use of these ports to interface to field

devices across distances which could produce high levels of ground potential rise,

(i.e. greater than 2500V) during line to ground fault conditions.

The Precision Time Protocol (PTP) card option for the RX1000 series provides

accurate time synchronization across local and wide area networks. The PTP card is

capable of using a variety of time synchronization methods including Network Time

Protocol (NTP), IRIG-B, and IEEE 1588, making it a flexible product for new and

existing installations.

NTP is the standard for synchronizing the clocks of computer systems throughout the

Internet and is suitable for systems that require accuracies in the order of 1 ms.

IRIG-B time synchronization relies on the Global Positioning System (GPS) as the

source of accurate time and requires an external GPS antenna input to provide

accurate time signals on the order of 100 µs. IEEE 1588 is designed to fill a niche

not well served by either of the two dominant protocols, NTP and IRIG-B. IEEE 1588

is designed for local systems requiring accuracies on the order of 100 nanoseconds.

IEEE 1588 is also designed for applications that cannot bear the cost of a GPS

receiver at each node or for which GPS signals are inaccessible.

The PTP card option is an ideal product for use in existing installations already well

served by NTP and/or GPS. It also provides a migration path for the use of the new

IEEE 1588 standard. As more end devices enter the market with IEEE 1588

compatibility this card provides an easy transition to this new time synchronization

standard.

RuggedCom

- Rev.122

RuggedRouter

RX1000 Family

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