User's Manual

Bridges Hardware Guide Silver Spring Networks 30
Glossary
age commercial and industrial accounts. The data
collected is used by a utility to determine peak de-
mand times and adjust its distribution system ac-
cordingly.
IEEE Institute of Electrical and Electronics Engineers,
a prominent standards body for the electrical, tele-
communications, aerospace, and engineering in-
dustries.
IETF Internet Engineering Task Force, a prominent
standards body for the development and evolution
of the Internet networking architecture and the sta-
ble operation of the Internet.
image Firmware or software programming code that
can be copied to multiple programmable chips in
one or more devices, such as NICs or electricity
meters. See also firmware and code float.
IMU Interface Management Unit. A two-way radio in-
tegrated with gas and water meters that provides
consumption reads and can be remotely config-
ured.
in-band interferers Transmitters in the same ISM
band that are not part of Silver Spring’ transmitters.
info success rate The percentage of data packets
that succeed when a process sends a poll to a spe-
cific node and receives an acknowledgement. Cal-
culated by:
(successes / (successes +
failures)) * 100
instrument transformer A step-down transformer
for scaling down actual power system quantities for
metering, protective relaying and system monitor-
ing equipment. An example of an RTU device.
interferers See in-band interferers and out-of-band
interferers.
IPv6 Internet Protocol Version 6. A network layer
standard enables devices to communicate over a
packet-switched network.
ISM band Industrial, Scientific, and Medical band.
The 902-928 MHz band, an unlicensed frequency
band governed by FCC, Part 15.
J
job In AMM, a job is a running or scheduled process,
including but not limited to metering schedules, im-
ports, exports, and reports. In common usage, the
term schedule is reserved for jobs that read meters
over the network.
jobs interface The web services API used to run and
manage jobs.
joined A NIC and its meter are said to be joined when
they have been assembled, configured, tested, and
communicating together as designed. See also un-
joined.
K
kVA Kilo Volt Ampere.
kVAh Kilo Volt Ampere Hours.
kVAR Kilo Volt Ampere Reactive. A measure of reac-
tive energy usage. See also V, and Vrms.
kVAR lag The inductive reactance, or how much the
voltage lags the current, of the circuit.
kVAR lead The capacitive reactance, or how much
the voltage leads the current, of the circuit.
kVARh Kilo Volt Ampere Reactive Hours. A unit of en-
ergy equivalent to one kVAR of power expended for
one hour. See also V.
kW Kilowatt. A unit of power equal to 1000 watts.
kWh Kilowatt-hour. A unit of energy equivalent to one
kilowatt (1 kW) of power expended for one hour.
L
lag See kVAR lag.
LAN Local Area Network. Computers and other de-
vices that share a common wireless link within a
geographic area. See also NAN (Neighborhood
Area Network) and Wide Area Network.
last gasp An asynchronous message from an elec-
tricity meter that indicates the meter has lost power.
Also known as a power out message. Last gasps
can result when the loss-of-power pin becomes ac-
tive, when a number of zero crossing events are
missed, or when a transition from utility power to
battery power occurs. There is no guarantee that a
last gasp will be received by any other device in the
network. See also Verified Single No Current.
link A connection between devices in a network. See
also hop and route.