Sierra Wireless 595U manual Appendix a Glossary, Cdma

Appendix A: Glossary A

1X

1x-EVDO

bps

CDMA

CDMA 1X

circuit switched cellular

dormant

One Times Radio Transmission Technology (the ʺone timesʺ refers to the frequency spectrum). Supports Internet connec‐ tions with data rates up to 153 Kbps. Actual speed depends on the network conditions. Compare to 1x‐EVDO.

Ahigh‐speed standard for cellular packet data communica‐ tions.

Rev. A supports Internet connections with data rates up to

3.1Mbps (downlink from the network) and 1.8 Mbps (uplink to the network).

Rev. 0 supports Internet connections with data rates up to

2.4Mbps (downlink from the network) and 153 Kbps (uplink to the network).

Average data rates are roughly: for Rev. A: 600–1300 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.

bits per second—The actual data speed over the transmission medium.

Code Division Multiple Access—A wideband spread spectrum technique used in digital cellular, personal commu‐ nications services, and other wireless networks. Wide channels (1.25 MHz) are obtained through spread spectrum transmissions, 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.

Also known as 1X, this is a high‐speed standard for CDMA cellular communications.

V.xx modem communications over a cellular network. It uses a dedicated connection circuit, in contrast to packet‐switched. The user is charged by the carrier for the duration of the connection.

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‐ aquired and the original PPP session resumes.

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