Blackberry 2012 Annual Report Download - page 101

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93
GPRS
General Packet Radio Service. An enhancement to the GSM (see below)
mobile communications system that supports data packets. GPRS enables
continuous flows of IP data packets over the system for such applications as
Web browsing and data access. GPRS differs from GSM’s short messaging
service, which is limited to messa
g
es of 160 b
y
tes in len
g
th.
GPS
Global Positionin
g
S
y
stem.
GSM
Global System for Mobile Communications. A digital cellular phone
technology based on TDMA that is the predominant system in Europe, but is
also used around the world. Operating in the 900MHz and 1.8GHz bands in
Europe and the 1.9GHz PCS band in the U.S., GSM defines the entire
cellular system, not just the air interface (i.e. TDMA, CDMA). GSM phones
use a Subscriber Identity Module (SIM) smart card that contains user account
information.
HDI
High Density Interconnect. A measure of the average amount of circuitry
p
acka
g
e in a
g
iven area of assembl
y
.
HSPA
High-Speed Packet Access. A family of radio interface standards that will
improve the speed and accuracy of traffic over cellular networks. HSPA
builds on the existing WCDMA technology that has already been deployed to
allow carriers to offer better speeds and larger bandwidth intensive services
like streamin
g
audio and video.
Hybrid PBXs
Hybrid PBXs support both traditional Time Division Multiplexed (TDM)
p
hones to VoIP, easin
g
the transition from TDM to VoIP.
iDEN
Integrated Digital Enhanced Network. A wireless communications
technology from Motorola that provides support for voice, data, short
messages (SMS) and dispatch radio (two-way radio) in one phone. Operating
in the 800MHz and 1.5GHz bands and based on TDMA, iDEN uses
Motorola’s VSELP (Vector Sum Excited Linear Predictors) vocoder for
voice compression and QAM modulation to deliver 64 Kbps over a 25 kHz
channel. Each 25 kHz channel can be divided six times to transmit any mix of
voice, data, dispatch or text message. Used by various carriers around the
g
lobe, Nextel Communications
p
rovides nationwide covera
g
e in the U.S.
IM
Instant Messaging. A medium which enables two or more people to
communicate in real time utilizin
g
t
yp
ed text over an electronic network.