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Gateway
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Gigabit Ethernet
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GHz
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GPON-
Gigabit PON. The latest PON (Passive Optical Network) specification that was defined by
the ITU-T in G.984 series of standards. GPON offers advantages
over other PON architectures (i.e. APON, BPON, and EPON). It
provides downstream capacity of 2.5 Gbps and upstream of 1.25
Gbps and has longer fiber reach of up to 60 km from the CO. It
supports RF video overlay, security with AES, and higher split
ratio of 1:64. GPON was designed to provide triple play services
(video, voice, data). GPON uses Ethernet encapsulation for
carrying traffic.
Also see PON.
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GPRS-
General Packet Radio Service. A packet-switching technology
that runs over GSM/TDMA network. GPRS is often mentioned as 2.5G technology (between
2G and 3G).
Internet connection using GPRS network gives true mobility.
You can browse the Internet on your notebook using your mobile phone as the modem. Or you
can also surf the Internet using your mobile phone's WAP browser.
GPRS promises faster connection up to 115 kbps. Nonetheless, the
Internet experience is like using a dial-up modem. Real world
performance (data rate) depends on GPRS and GSM traffic
condition and the connection pipe to the Internet.
GPRS allocates unused GSM cell to carry data packets.
Based on its data carrying capacity, GPRS device (e.g. mobile
phone) is often classified
into multi-slot classes as follows:
Class |
Downlink Slots |
Uplink Slots |
Active Slots |
1 |
1 |
1 |
2 |
2 |
2 |
1 |
3 |
3 |
2 |
2 |
3 |
4 |
3 |
1 |
4 |
5 |
2 |
2 |
4 |
6 |
3 |
2 |
4 |
7 |
3 |
3 |
4 |
8 |
4 |
1 |
5 |
9 |
3 |
2 |
5 |
10 |
4 |
2 |
5 |
11 |
4 |
3 |
5 |
12 |
4 |
4 |
5 |
The sum of downlink slots and uplink slots that is used by a
GPRS device in a GPRS session can not exceed the allowed active
slots. Each time slot has a maximum capacity of 14.4 kbps.
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GPS-
A navigation system in which position or coordinate calculation
is based on data coming from 3 or 4 geostationary satellites
that circle the earth at an equatorial orbit at an altitude of
35,786 km. Besides standalone GPS receiver, GPS cards are
available in the market for providing GPS basic positioning
service to mobile devices. However, enhanced positioning service
usually requires a subscription to a service provider.
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GSM
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