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(EN) Ethernet Clock Synchronization Option

(EN) Ethernet Clock Synchronization and Control;

The ethernet interface allows the clock to be connected to a computer network. Network Time Protocol (NTP) and Universal Datagram Protocol (UDP) are both available at the same time. Switching between the two methods is not required.

NTP is a uniform method of sending time over a computer network. By default, the clock will act as a client to public or local NTP time servers. The clock can also be configured to receive NTP broadcasts. NTP provides Universal Coordinated Time (UTC) to the clock. The clock implements offsets and daylight saving rules to display the correct local time.

UDP is a simplified time synchronization and clock control method available only on the local subnet. The UDP broadcast cannot communicate outside a local area subnet. UDP is commonly used to control and configure the clocks. The time can also be broadcast from a PC or clock to all clocks.

Once the clock is connected to the network and power is applied, DHCP is used to automatically assign each clock an IP address on the network. Then, each clock will search the Internet or local area network for time servers. The correct time will display within a few minutes of obtaining a time server lock. The clock includes a list of 50 Internet NTP time servers. Local NTP time servers may also be used. The control software included with the clock, and available for download from the BRG web site, may be used to assign IP addresses for local time servers. Up to 10 local time servers may be assigned. Once all clocks are attached to the network and operating, simply send a command from the PC clock control program to assign a new local time server IP address. The new IP address will be assigned to all clocks on the subnet simultaneously. The clocks will immediately begin using the new local time server.

An RJ-45 ethernet jack is available at the back of clock for connecting to the ethernet network cable. Standard 10 BASE-T half-duplex Ethernet is supported.

This option adds ethernet sync and control to digital clocks. When ordering, simply add the letters EN to the clock model number, i.e. BRG440-EN.

Power for the clock is supplied using an AC adapter or mains power supplied directly to the clock. See the power configuration section on the options page for more power supply configurations. See Power over Ethernet (PoE) below for a method of powering the clock over the Ethernet cable.



Power-over-Ethernet Overview (PoE)

Power Over Ethernet
United States Patent No. 6,218,930
Power-over-Ethernet (PoE) is a network standard based on IEEE 802.3af that provides a means of delivering power to devices connected to the LAN. This technology eliminates AC electrical wiring, wall transformers, allows centralized UPS backup, and is fully compatible with both powered and non-powered Ethernet devices.

In addition to providing time synchronization and control over Ethernet, PoE enabled Ethernet cable provides power to the clock. System installers need run only a single Ethernet cable that carries both power and data to each clock. This allows greater flexibility placing clocks and, in most cases, significantly decreases installation costs. BRG clocks are fully compliant with the IEEE 802.3af standard for providing power over Ethernet. The clocks will work with older non-standard and passive power sources, as well as newer, auto-sensing PoE switches and mid-span power injectors.

Power-over-Ethernet begins with a Ethernet power source such as a PoE compatible Switch or a mid-span power "Injector". These devices insert power onto the Ethernet cable. The power source is typically installed in the "wiring closet" near the Ethernet switch or hub.

Clocks may be ordered as PoE compatible by adding the (P13) power option. This option adds the necessary circuitry to fully implement the IEEE 802.3af standard. PoE is able to supply a maximum of about 15 watts of power over the Ethernet cable. This means that not all clocks are candidates for PoE.

If the access point is not PoE compatible, BRG offers single port mid-span power injectors designed to provide power to a single clock (P14 power option). Multiport mid-span PoE power injectors are available from most network equipment vendors. The voltage injected is 48 volts DC at 0.35 Amps.

Power Over Ethernet


BRG Precision Products
600 N. River
Derby, KS 67037
Call 800-295-0220 today!
(Call 316-788-2000 outside the U.S. and Canada)
Fax: 316-788-7080

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