User's Manual Part 9

References:
Page 120 Element Management System (EMS) 4.0
Spectrum Transport Module (STM):
One of the two modules in the remote
unit. Its job is to transport the RF
spectrum between the antenna and host
unit using optical signals over fiber or
an optics free space link.
Standby Mode: One of the four
operating modes of the host unit. In this
mode, RF transport is disabled and
power consumption is minimized.
Standby mode occurs only due to a user
request and can be turned off by the
user to return the host unit to a Normal
operating mode.
Synthesizer: Host/remote function that
synthesizes an RF signal. There are four
synthesizers: primary forward, primary
reverse, secondary reverse, and
reference.
STM: See Spectrum Transport
Module.
Test Mode: One of the four operating
modes of the host unit. In this mode, RF
transport continues regardless of errors
that would otherwise stop transport.
Test mode is used when turning up the
host unit or remote unit to force it to
transport RF signals for test purposes.
Threshold: Value that defines when a
reported state in the host/remote pair is
considered to be in alarm.
Trim Time: Number of days that EMS
will allow an entry to remain in the log
file before being deleted. Trim time can
be changed using the Preferences
window.
Voice Channel: RF bandwidth of
about 300 KHz carrying the equivalent
of one phone conversation. In the
Digivance SDR system, up to eight
voice channels are multiplexed into a
logical RF channel.
Voice Over Internet Protocol: Packet-
switching internet protocol used to send
voice information such as telephone
conversations over the internet.
VOIP: See Voice Over Internet
Protocol.