Liberty 100 Smart Electricity Meter Technical Reference Manual
6 Communication Hub (Skyline-i 510)
The communication hub is fitted inside the meter’s communication module and serves as the communication
gateway to the Head End System (HES) via a Wide Area Network (WAN) and other smart metering devices via
a Home Area Network (HAN). The hub is powered by the meter and consumes less than 2.5 W under normal
operation. It communicates with electricity meter via an UART.
The hub provides the flexibility to upgrade or change the meter’s communication technology without the need to
remove the meter or break metrological seals. Liberty’s default hub contains GPRS WAN and ZigBee HAN
communication modules. The GPRS module connects the meter to the HES over the WAN providing remote
data transfer between the meter and HES on request or as scheduled. The hub acts as coordinator for ZigBee
HAN, managing connection with other HAN devices – e.g. In Home Display (IHD) and gas meter.
The hub has an internal antenna for WAN communication. It also has provision for connecting an external
antenna to support GPRS communication if the meter has to be installed in a location with poor signal strength.
Information on the Hub front cover
Figure 3 shows information available on the front cover of Skyline-i 510 hub:
Figure 15: Skyline-i 510 front cover printings
Significance of LEDs on the Hub
: Power LED – flashes once when the meter is powered
WAN : WAN activity and GPRS signal strength indicator LED
• Continuous quick flashing signifies WAN activity
• 5 or less flashes at 2 sec interval signifies GPRS signal strength – more flashes indicates better
signal strength, 5 is maximum
• Continuous OFF signifies no signal
HAN : HAN activity indicator LED
• Continuous ON signifies HAN joining is allowed.
• Continuous OFF signifies HAN joining is not allowed.
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