J2ME: Java 2 Platform, Micro Edition
Java 2 Platform Micro Edition (J2ME) is a technology that allows developers to use the Java programming language to create applications for mobile wireless devices.

Jamming
Jamming refers to the interference with the air radio transmission. It may be used by people who is trying to disturb the receiver from receiving the radio signal at a target frequency.

JavaPhone
JavaPhone is a Java API specification controlling contacts, power management, call control, and phone book management. It is intended specifically for the programming requirements of mobile phones.

JTACS or J-TAGS: Japanese Total Access Communication System
Japanese Total Access Communication System (JTAGS) is a 1G technology deployed in Japan based on the European TACS system. JTAGS is operating in the 900-MHz band.

JTAPI: Java Telephony API
The Java Telephony API (JTAPI) is an extensible API that offers an interface to all call control services. The services include those needed in a consumer device up to those of enterprise call centers. JTAPI is part of the JavaPhone API.

Ka-Band
Ka-Band refers to the bandwidth of electromagnetic wave between 33 GHz to 36 GHz, which is primarily used in satellites operating at 30 GHz uplink and 20 GHz downlink for mobile voice communications.

Key Pulse Signal
Key-pulse signal is the first signal in an multifrequency outpulsing format, which is a control signal used to prepare the remote customer installation to receive digits.

KHz: KiloHertz
One kHz (KiloHertz) is equal to 1,000 Hertz, which is a measurement of frequency.

kpbs: Kilobits per second
kpbs (Kilobits per second) is a measurement of data rate, for example, data services for 2G operates at maximum speed of 9.6kbps.

Ku-Band
Ku-Band refers to the bandwidth of electromagnetic wave between 12 GHz to 14 GHz, which is primarily used in satellites operating at 14 GHz uplink and 11 GHz downlink in supporting braodband TV and Direct Broadcast Satellite (DBS) system (DSS).