Sigma Mod Master Clock

General
The required master clock shall be the Bodet Sigma MOD or equivalent.
The master clock shall generate the synchronised time information.
The time source for the master clock shall be obtained from the Global Positioning System (GPS) via a rooftop antenna.
The synchronized time information shall be provided to the slave clocks and servers via a standard NTP (Network Time Protocol) time distribution system.

System Requirements
•	A GPS receiver to provide the time source received from the satellites to the master clock via a rooftop antenna.

•	A master clock to convert the time source into a standard time signal to be used by the slave clocks and to distribute the time information via NTP on the Ethernet network.
During operation the master clock shall display time and date, synchronisation status and alarms on a 2 lines of 24 characters LCD backlit display.
The master clock shall be an Ethernet based system with an IP/NTP time signal output for LAN or WAN computer network, with slave clock control and monitoring. The master clock shall be able to operate as NTP client and as NTP server at the same time delivering time message through NTP protocol on IP network using CAT 5 or CAT 6 cables. 

Performance Specifications
Accuracy
The stability of the time base shall be guaranteed by a temperature compensated quartz oscillator (TCXO).
The TCXO quartz time based shall have a minimum accuracy of 0.1 second per 24h at stabilized temperature.
The master clock shall be synchronized with GPS satellites providing accuracy better than 5 ms per 24h with GPS locked on.

Reliability 
The master clock reliability (MTBF) shall not be less than 60.000 hours.

Safety 
All the equipment shall comply with:  EN 60950 - EN 55022 - EN 550024 – EN 301-489-3 – EN 300-220-3.
All master clock outputs shall be protected against overloads and short circuits.

Technical Requirements
GPS Antenna
The GPS antenna shall have an easy to install IP 54 waterproof casing and shall be installed outdoor preferably on a rooftop.
A yellow flashing LED indicator shall show the operating status of the antenna.
The GPS antenna power supply shall be provided by the master clock.
The antenna cable length shall be 20 meters with possibility to extend the cable up to 300 metres without amplifier system. 

Master Clock
The master clock shall have a LCD display indicating: date, hour, minute and second. 
The master clock shall automatically carry out summer/winter time changeovers and shall recognise holidays and bank holidays.
The access for parameter setting shall be protected by a PIN code.
The power for master clock shall be provided by the 110/230V AC mains or by a 24V DC power supply. 
The master clock shall be able to operate within the temperature range of 0 to 50°C.
Two casing versions shall be available: wall mounting ABS casing and aluminium casing for 19” (1U) rack.
The minimum available inputs requirement shall be as follow: GPS for synchronization, Ethernet port for programming and NTP synchronisation, external input (for connection of push button or a dry relay contact...) and RS485 input port for communication with an extension module.
The minimum outputs requirements shall include the following standard time signals: 24V minute impulses, IRIG-B/AFNOR coded time, signal for wireless time distribution, wireless relay control and wireless sounders (869MHz radio transmitter - DHF), IP for NTP network synchronisation and 3 relay outputs.
The relay outputs shall be available for alarm indication or D1-D2 time distribution (for tower clocks) or circuit programming for bell ringing control, heating control or access control.
The master clock shall be able to be configured, programmed and operated either from the built-in keypad or from a PC based software (supplied with the master clock) via the Ethernet connection or via a USB flash drive. 
The system shall permanently and automatically save all parameters and programming in the master clock unit. The saved information shall be able to be downloaded onto a USB flash drive.