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1080 is the vertical pixel of a resolution 1920 x 1080; the number of horizontal pixels is implied from context and is
often omitted. The lower-case i denotes interlaced and the lower-case progressive.

High definition television (HDTV) has much more number of lines of resolution and produces better quality image
by about 2 to 5 times than standard television. Resolution is defined as number of horizontal pixels x number of
vertical pixels, for example 1280 x 720 or 1920 x 1080. Often the number of horizontal pixels is implied from
context and is omitted.

The resolution number is appended with i or p; the lower-case i denotes interlaced and the lower-case p
progressive. With the interlaced scanning method (when the notation is 1080i), the 1,080 lines of resolution are
divided into pairs. The first 540 alternate lines are painted on a frame and then the second 540 lines are painted
on a second frame. The progressive scanning method (when the notation is 1080p) simultaneously displays all
1,080 lines on every frame with better quality pictures, requiring greater bandwidth.

The notation can also be appended with scanning rate like 1080160,1080p30, or 720p60. The numbers after i or
p are scanning rate per second. For commercial naming of a product, the frame rate is often dropped.


802.11 and 802.11 x refers to a family of standards developed by IEEE for wireless LAN technology. Popular
standards are 802.11a, 802.11b, 802.11g and 802.11n.

AC Adapter

Alternating Current Adapter; when plugged to AC Power (usually 117VAC/60HZ in the United States) it produces
12VDC, 24VAC or others. "UL Listed" and "Regulated" recommended. It is also called Power Transformer. More

AC Power

Alternating Current Power. In the United States, the standard AC Power is single-phase 117VAC/60HZ and is
provided from power outlets in the house. 24V AC power can be produced from an AC Adapter
AGC (Automatic Gain Control)