Sierra Wireless Compass 597 - Manual (Page 57)

Document 2130972. Rev 1.0 Apr.08 57
A Appendix A: Glossary
1X One Times Radio Transmission Technology (the ʺone timesʺ
refers to the frequency spectrum). Supports Internet
connections with data rates up to 153
Kbps . Actual speed
depends on the network conditions. Compare to 1x‐EVDO .
1x-EVDO A high‐speed standard for cellular packet data communica‐
tions.
Rev. A supports Internet connections with data rates up to
3.1
Mbps (downlink from the network) and 1.8 Mbps (uplink
to the network).
Rev. 0 supports Internet connections with data rates up to
2.4
Mbps (downlink from the network) and 153 Kbps (uplink
to the network).
Average data rates are: for Rev. A: 450–800 Kbps (downlink
from the network) and 300–400 Kbps (uplink to the network);
for Rev. 0: 400‐700 Kbps (downlink from the network) and
40‐80 Kbps (uplink to the network).
Actual speed depends on the network conditions. Compare to
1X .
bps bits per second—The actual data speed over the transmission
medium.
CDMA Code Division Multiple Access—A wideband spread spectrum
technique used in digital cellular, personal communications
services, and other wireless networks. Wide channels
(1.25
MHz ) are obtained through spread spectrum transmis‐
sions, thus allowing many active users to share the same
channel. Each user is assigned a unique digital code, which
differentiates the individual conversations on the same
channel.
CDMA 1X Also known as 1X , this is a high‐speed standard for CDMA
cellular communications.
dormant The packet data connection has the logical PPP session left
open while the underlying physical link (the radio channel) is
released. When traffic is to resume, a radio channel is
re‐acquired and the original PPP session resumes.
ESN Electronic Serial Number—The unique first‐generation serial
number assigned to the modem for cellular network use.
Compare to
MEID .
ExpressCard™ Add‐in memory and communications cards for portable
computers. ExpressCard is a trademark of the
PCMCIA .