circuit-switched data

2G 2.5G (GPRS) 1 It does not necessarily provide faster services because bundling of timeslots is used for circuit-switched data services (HSCSD) as well

General Packet Radio Service - Channel encoding 1 In addition to GPRS, there are two other GSM technologies which deliver data services: circuit-switched data (CSD) and high-speed circuit-switched data (HSCSD). In contrast to the shared nature of GPRS, these instead establish a dedicated circuit (usually billed per minute). Some applications such as video calling may prefer HSCSD, especially when there is a continuous flow of data between the endpoints.

GSM services - Circuit-switched data protocols 1 A circuit-switched data connection reserves a certain amount of bandwidth between two points for the life of a connection, just as a traditional phone call allocates an audio channel of a certain quality between two phones for the duration of the call.

GSM services - Circuit-switched data protocols 1 Two circuit-switched data protocols are defined in the GSM standard: Circuit Switched Data (CSD) and High-Speed Circuit-Switched Data (HSCSD). These types of connections are typically charged on a per-second basis, regardless of the amount of data sent over the link. This is because a certain amount of bandwidth is dedicated to the connection regardless of whether or not it is needed.

Mobile phone features - Data communications 1 Later, there were introduced improved version of CSD - High-Speed Circuit- Switched Data|HSCSD (high speed CSD), it could use multiple time slots for downlink, improving speed

Wireless Application Protocol - Technical specifications 1 On native IP bearers such as GPRS, UMTS packet-radio service, or Point-to- Point Protocol|PPP on top of a circuit- switched data connection, WDP is in fact exactly UDP.

Universal Mobile Telecommunications System - Features 1 These speeds are significantly faster than the 9.6 kbit/s of a single GSM error- corrected circuit switched data channel, multiple 9.6 kbit/s channels in High-Speed Circuit-Switched Data|HSCSD and 14.4 kbit/s for CDMAOne channels.

Circuit Switched Data 1 * High-Speed Circuit-Switched Data (HSCSD) is a system based on CSD but designed to provide higher data rates by means of more efficient channel coding and/or multiple (up to 4) time slots.

High-Speed Circuit-Switched Data 1 'High-speed circuit-switched data' ('HSCSD'), is an enhancement to Circuit Switched Data (CSD), the original data transmission mechanism of the GSM mobile phone system, four to six times faster than GSM, with data rates 'up to 57.6kbit/s'.

GPRS - Channel encoding 1 In addition to GPRS, there are two other GSM technologies which deliver data services: Circuit Switched Data|circuit- switched data (CSD) and high-speed circuit- switched data (HSCSD). In contrast to the shared nature of GPRS, these instead establish a dedicated circuit (usually billed per minute). Some applications such as video calling may prefer HSCSD, especially when there is a continuous flow of data between the endpoints.

2.5G - 2.5G (GPRS) 1 '2.5G' ('second and a half generation') is used to describe 2G-systems that have implemented a packet-switched domain in addition to the circuit-switched domain. It does not necessarily provide faster services because bundling of timeslots is used for circuit-switched data services (HSCSD) as well.

Nokia Connectivity features of the 9500 include: Bluetooth, Infrared Data Association|infrared, Universal Serial Bus|USB, Wi-Fi (Nokia's first device with Wi-Fi), Circuit Switched Data|CSD, High-speed circuit-switched data|HSCSD, General Packet Radio Service|GPRS and Enhanced Data Rates for GSM Evolution|EDGE. It has send and receive fax facilities (without Image scanner|scanner) and multi-account Post Office Protocol|POP3/Internet Message Access Protocol|IMAP client.

Terrestrial Trunked Radio - Description 1 In addition to voice and dispatch services, the TETRA system supports several types of data communication. Status messages and short data services (SDS) are provided over the system's main control channel, while packet-switched data or circuit-switched data communication uses specifically assigned channels.

Traffic generation model - Poisson traffic model 1 Another simplified traditional traffic generation model for circuit-switched data as well as packet data, is the Poisson process, where the number of incoming packets or calls per time unit follows the Poisson distribution. The length of each phone call is typically modelled as an exponential distribution. The number of simultaneously ongoing phone calls follows the Erlang distribution.

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