Specifications

Suggested Functional Specs. Continued - 3 -
Masterclock, Inc.
January
phone (USA and Canada): 1-800-940-2248 | phone (international): [phone]
email: [e-mail] | online: www.masterclock.com
Accuracy:
The networks clock displays shall be accurate to within 50 milliseconds of the UTC time reference
provided by the NTP server(s), when synchronized.
Protocol:
The Ethernet wired clocks shall support the following protocols:
SNTP, Simple Network Time Protocol
The network clocks shall operate with an internal reference time that is set to UTC (Universal
Coordinated Time) via a built-in the SNTP client, from up to two NTP timeservers. Selection of the
primary and secondary servers shall be automatic, but configurable by either static IP address or
DHCP provided IP address configuration methods.
The network clocks shall be configurable to operate as an SNTP client in the following operational
modes: unicast (or query), broadcast, or multicast.
DHCP, Dynamic Host Configuration Protocol
The network clocks shall utilize DHCP (Dynamic Host Configuration Protocol), by default, as a
means of automating the configuration of all required network settings utilizing the optional
settings area of a DHCP server. All DHCP network and optional NTP settings shall allow for enabling
or disabling at each clock, in order to use static IP address mode network and NTP settings.
Power:
The network clocks shall utilize a standardized Power over Ethernet (POE) technology to power the
clock in compliance with the IEEE 802.3af Power over Ethernet specification.
The network clocks shall be considered to be and to operate as Powered Devices (PD); and shall
utilize a 48V DC nominal voltage supplied over the spare Ethernet network cable pairs, and/or the
shared data/pairs, from an IEEE 802.3af compliant Power Sourcing Equipment (PSE) device, with a
10/100 MB rating, for a distance of up to 100m (328 ft). Power consumption shall be less than
12.95 Watts maximum for all PD equipment. Each network clock PD shall have a typical power
rating of less than 7.5 W.
The network clocks shall be made available with an optional AC power. The power input shall be
made as a universal type with an input power range of 90-264 VAC, 47-63 Hz and utilizing a
standard IEC power jack.
Connectors:
Type Connector
Ethernet 10/100 Base-T: RJ45
The network clock system shall utilize standard Cat 5 or Cat 6 cabling for the distribution of either
data, or data and power using the same standard cable, and eliminating the need for an AC power
source at the clock location.
Configuration settings:
The time displayed on the face of the network clocks may either be UTC time or local time and shall
be configurable via software.
Clock displays shall offer flexibility to allow for any international time zone offset and automatic
Daylight Saving Time (DST) adjustment and shall provide maintenance free reliable operation.
Configuration changes shall be retained in non-volatile flash.
The network clocks shall utilize an internal maintenance free rechargeable battery backed real-time
clock (RTC) to retain the internal time in the event of a power outage or for conditions when the
NTP server(s) is not available. The network clocks shall not display the time during a power outage,
but shall recover from such power outage as a system without intervention.