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3.3 Email
Ngara can be configured to generate email alerts when specified noise limits are exceeded.
The email server which is used to route the required alert emails is provided by Acoustic Research Labs, free of charge.
The server address can be changed if required by submitting a request to Acoustic Research Labs.
Email alerts run independently of any type of logging session
3.3.1 Communication
The Ethernet interface on the Ngara is used for all communications to the email server. This can be interfaced
through a modem for a completely remote installation, or to a local area network as available. The connection type
can be updated using the on-board interface (Section 4.4.3.6).
When configured to use a modem for connection, Ngara will interrogate the modem for the items shown on Table
10.
If Ngara is configured to use a modem for connectivity, it will wait for valid network registration before
trying to contact the email server.
When configured to use a modem, but instead is incorrectly connected to a local area network, this
registration will never be found and all communications will appear to stop.
3.3.2 Power Saving
When configured for email alerts, and Ngara is configured to control the power to the modem, power will be provided
to the modem when there is a need to send an email. Otherwise, the modem will remain off to conserve battery
power.
The modem power will be turned off after the email is sent.
If using a modem connection, power on times for the modem will vary between 1 to 5 minutes.
Expect this amount of delay for email delivery.
3.3.3 Format
The email alert provided by Ngara is a simple text email which is appended with each new email alert. This allows
for internal buffering of alerts in the event that no communication could be established with the mail server. The
general format of each alert email entry is shown below, with details of all values described in Table 11.
YYYY-MM-DD HH:MM Lx (len band) -- xxx.x dB(fweight) [level dB(fweight)]
Version — 25-7cd7566
Table 10: Modem Status
Item
Description
status
Current SIM status
Radio signal strength
signal
technology
Radio technology in use
registration
Wireless network registration status
Ngara
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