Newton[ap]s Telecom Dictionary

D: D-Dynamotor

How each touchtone button makes two tones

J: J Box-JVM

NORTH AMERICAN HIERARCHY (T-CARRIER)

JAPANESE HIERARCHY (J-CARRIER)

M: m-MZI

INTERNATIONALLY ACCEPTED MODEM MODULATION PROTOCOLS

American Morse Code

International Morse Code

N: N-NZDF

North American Area Codes By Number

North American Area Codes By Place

S: S-Systemview

The Evolution of SDRAM

T: T-Typing Reperforator

NORTH AMERICAN HIERARCHY (T-CARRIER)

JAPANESE HIERARCHY (J-CARRIER)

EUROPEAN HIERARCHY (E-CARRIER)