Nortel Networks 411-2021-111 manual Stsr

xviList of terms

ST

Signaling Tone. In AMPS cellular, a 10 kHz tone transmitted on the Reverse Voice Channel (RVC) as a precursor to messaging activity, and for certain call- processing functions (acknowledgments, call termination). Presence of the tone mutes normal conversational audio.

STSR

Sectored-Transmit/Sectored-Receive. A cell configuration in which a different control and voice frequency assignment is designated for each sector. A directional antenna system is required for each sector.

TDMA

Time Division Multiple Access. A modulation and transmission format that allows a number of digital conversations (three in TDMA-3) to occur within the same Radio Frequency (RF) channel. Mobile units take turns transmitting/ receiving data on specific time slots of a TDMA frame.

TRU

Transmit Receive Unit. The TRU is a Digital Signal Processing (DSP) based transceiver capable of two modes of operation, analog (AMPS) and digital (TDMA).

VCH

Voice Channel. A Radio Frequency (RF) channel used to transmit cellular voice conversations. The VCH is also an integral part of call setup, handoff, and disconnect.

VSWR

Voltage Standing Wave Ratio. A measure of the mismatch between the transmitter source impedance and the load impedance to which it is connected. It is defined by the following relationship:

1	+	Reflected Power
		Forward Power
VSWR =
1	-	Reflected Power

Forward Power

411-2021-111 Standard 01.01 June 1996