2G

short for "second generation", is the second generation of mobile telecommunications technology (aka GSM)

3G

short for "third generation", is the third generation of mobile telecommunications technology (aka UMTS), succeeding 2G

T1

1st multiplex level of SDH (North America), 1.554Mbps

T3

3rd multiplex level of SDH (North America), 44.736Mbps (28x T1)

TCP

Transmission Control Protocol

TDD

Time Division Duplex

TDM

Time Division Multiplex

Tx

transmit