LPI (Linux Professional Institute)
LPI provided a total of basic (foundation, level 1), advanced (Advanced level 2) and expert (professional level 3) three levels of certification tests.
To attend the basis of tests must also be certified to possess the same basic skills to participate in RHCE. The advanced certification test required to have a deeper skills, is a systems management certification tests.
Professional Certification test is a matter more in-depth, professional, such as the database server management, or kernel and drivers development.

LPX Hardware
A motherboard (MOTHERBOARD) specifications, the use of the slot to be known as the RISER expansion slot (EXPANSION SLOT) parallel to the direction of shift with the motherboard, that motherboard does not directly inserted expansion card, there is a slot after the plug RISER , expansion card inserted in RISER, use this approach to reduce the computer case (CASE) in size, but can be less expansion slots. LPX has gradually been replaced by NLX specification.

LTPS (Low Temperature Poly-Silicon)
LTPS is a new generation thin-film transistor liquid crystal display (TFT-LCD) manufacturing process. With the traditional a-Si LTPS display the biggest difference is that a faster reaction speed, and high brightness, high resolution and so on.
TFT-LCD can be divided into two kinds of poly-silicon and amorphous silicon technology. Currently the mainstream mostly amorphous silicon TFT-LCD-based, relevant technology is more mature. However, LTPS transistor carrier mobility due to the rate of two hundred times higher than amorphous silicon technology, the display with high brightness and high-resolution features, will be able to present a better picture quality.

LTT Subscriber Line Test Repeater
LTT (Line Test Trunk) LTT primarily provides user circuit test equipment and switch between the interface device. Subscriber Line Test repeater equipment, there are two, one for the 9-wire LTT, another four-wire LTT.
Speaking of user-loop testing the use of repeaters can be tracked for decades the day before yesterday-style crossbar switch and measurement units between the operational environment. Such as the XB-LTD9W the switch type, its nine-wire LTT contents include A, B, C, LTH, RLS, LTB, BY, LN and LTHR other signal lines.
Another test relay subscriber lines for the four-wire LTT, also known as the test into the repeater (Test Incoming Trunk, TSTICT). 4-wire LTT there A, B, C and D four lines. Where A and B as a pair of signals and the state control line, C and D as a pair of state control lines.

Zif-Welsh LZW Lempel-
By the three developers before a letter of surname made up of data compression (COMPRESS) technology, the name used in the GIF graphics file format. LZW patent by Unisys (UNISYS) company to obtain, UNISYS in 1995, announced the start of the use of all those who charge by using the Internet to protest groups, the shift to fees and charges for commercial use.