Simplex Ethernet Clock Manual de usuario descargar pdf (Pagina 11)

NTP [Network Time Protocol]

Unit 4, 2-8 South St

Rydalmere, NSW 2116

T: 13 14 91

F: 1800 659 025

W: www.simplextime.com.au

NTP definition & Application

Document: NTP.doc Issued: October 2008

Q: What time synchronization technology should I use?

Ethernet NTP:

Advantages:

- uses existing infrastructure for UTC time propagation, minimizing install

costs

- sufficiently accurate time source to drive clocks with 1 second resolution

Disadvantages:

- Requires existing LAN/WAN to be feasible against hard wired installations

- Still require power to clock from local mains supply

- IT skill level for maintenance

Ethernet (NTP + PoE):

Advantages:

- Power delivered to the clock over the Ethernet cable (PoE Type)

- Does not require separate wiring of local power. Power comes through

injectors

- Uses existing infrastructure for UTC time propagation, minimizing install

costs

- sufficiently accurate time source to drive clocks with 1 second resolution

- No electrician services required for clock installations

Disadvantages:

- May require upgrading of Cat5 Ethernet cable to suite PoE

- Requires additional hardware to inject power onto the LAN, and rules for

injector placement need to be adhered to.

- Requires existing LAN to be feasible against hard wired installations

- IT skill level for maintenance

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Simplex Ethernet Clock Manual de usuario Pagina 11