Technical Manual

70 D C U M a i n t e n a n c e a n d O p e r a t i o n M a n u a l
Front End Gain= -10.0dBm
Front End Gain is currently programmed during manufacturing value and is used in SRFN
devices to adjust the SiLabs reported RSSI values.
• The phyFrontEndGain represents the calculated front end gain (in decibels) from the
lighting arrestor (through FEM) to the T-Board SiLabs radio.
• For DCU 2+, the front end gain is set to 10dB (2*phyFrontEndGain).
• The DCU 2+ front end gain does not include any compensation for antenna gain or
antenna cable loss.
• The phyFrontEndGain value is used to calculate RSSI values.
• RSSI values reported by a DCU 2+ with a Laird antenna (5dBi) will be higher than RSSI
values reported by an EMWave antenna (3dBi).
Gateway Config = SRFN
The Gateway type (STAR/SRFN/NONE) indicates what type of network data the headend
should route to this T-board.
The NONE state is typically only used on 1 T-Board in an electric-only DCU 2+ containing
two T-Boards.
• T-Boards with a gateway=NONE send registration, hourly T-Board statistics, and
hourly RSSI statistics.
• T-Boards with a gateway=NONE will not be used by Headend to send data to
endpoints.
SRFN mac channnel sets =
467362500,467362500,
456000000,458000000,,,,,,,,,,,,,
,,,,,,,,,,,,,
The MAC is the control abstraction for the Radio physical layer.
• These channels identify the frequencies available for assignment to the SRFN
network
• May be referenced by alias of macChannelSets.
• SRFN MAC Process:
• MAC receives a request to transmit a SRFN frame.
• MAC looks in macChannelsSets and SRFN phyTxFrequencies to create list of valid
transmit channels.
• MAC randomly (if more than one) selects a transmit frequency from list for frame
so recommended that each board should only provide one SRFN transmit
frequency.
STAR mac channnel sets =
466600000,468000000,
456000000,458000000
The MAC is the control abstraction for the Radio physical layer. These channels identify
the frequencies available for assignment to the STAR network Alias
macChannelSetsSTAR. STAR MAC Process:
1. MAC receive a request to transmit a STAR frame.
2. MAC looks in macChannelsSetsSTAR and STAR phyTxFrequencies to create list of
valid transmit channels
3. MAC randomly (if more than one) selects a transmit frequency from list for frame so
recommended that each board only provide one STAR transmit frequency.
Field Example Description