HSCSD, or High Speed Circuit Switched Data, is an upgrade to the existing Time Division Multiple Access (TDMA) cellular phone system. HSCSD (High Speed Circuit Switched Data) is a specification for data transfer over GSM networks. HSCSD utilizes up to four Kb or Kb time slots, for a. High-Speed Circuit-Switched Data (HSCSD), is an enhancement technlogy of Circuit Switched Data (CSD), the original data transmission mechanism of the.

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The difference comes from the ability to use different coding methods and even multiple time slots to increase data throughput. Log in or register to post comments. It requires the time slots being used to be fully reserved to a single user. Such systems were limited by the quality of the audio signal to 2. Total users on TelecomSpace: This means that in the best conditions Channel allocation is done in circuit-switched mode, as with CSD. Dwta second innovation in the HSCSD radio interface was the possibility to use multiple time slots at the same time.

CSD uses a single radio time slot to deliver 9. Four times faster than GSM, with a transfer rate of up to Please help improve this article by adding citations to reliable sources. Who’s online There are currently 0 users online.

High Speed Circuit Switched Data (HSCSD)

One physical channel is one burst period per TDMA frame. Skip to main content. It is also possible to directly use the digital signal as an Integrated Services Digital Network ISDN data signal and switchrd it into the equivalent of a remote access server.

This speed makes it comparable to many fixed-line telecommunications networks and will allow users to access the Internet and other datacom services via a GSM network. The original error correction used in GSM was designed to work at the limits of coverage and in the worst case that GSM will handle.


Channels are defined by the number and position of their corresponding burst periods. The first innovation in HSCSD was to allow different error correction methods to be used for data transfer. Higher speeds are achieved as a result of superior coding methods, and the ability to use multiple time slots to increase data throughput.

The error correction used in GSM is designed to work at the limits of coverage and in the worst case hwcsd GSM will handle. Who’s new Amit Singh Hemantjha Josip11 devik abdul gafar. This enables internet access at the same speed of many dial-up modem services across fixed swwitched networks.

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High-Speed Circuit-Switched Data | TelecomSpace

Swotched is because the user of an HSCSD connection does not have to wait for permission from the network to send a packet. A single dedicated radio time slot is allocated between the phone and the base station. This means that the primary reason to use HSCSD in this environment would be access to legacy dial up systems.

In a GSM network single slots are allocated to each user, which has a standard data transfer rate of 9. This article needs attention from an expert in Telecommunications.

Channels can be divided into dedicated channels, which are allocated to a mobile station, and common channels, which are used by mobile stations in idle mode. Please add a reason datta a talk parameter to this template to explain the issue with the article.

This means that a large part of the GSM transmission capacity is taken up with error correction codes. WikiProject Telecommunications may be able to help recruit an expert.


At the MSC, it is possible to use a swirched to convert to an ” analog ” signal, though this will typically actually be encoded as a digital pulse-code modulation PCM signal when sent from the MSC.

At the same time, the speech-oriented audio compression used in GSM actually meant that data rates using a traditional modem connected to the phone would have been even lower than with older analog systems.

The service has a limited number of users, as when more slots are allocated to each user then network will become overloaded far more quickly than for voice users.

HSCSD – Telecom ABC

February Learn how and when to remove this template message. Prior to CSD, data transmission over mobile phone systems was done by using a modem, either built into the phone or attached to it.

This means that a large part of the GSM transmission capacity is taken up with error correction codes. The user is then charged, often at a rate higher than a normal phone call, and sometimes multiplied by the number of time slots allocated, based on the period of time that the user has a connection active.

Bluetooth Bluetooth is an alliance between mobile communications and mobile It switches possible that either at the beginning of the call, or at some point during a call, it will not be possible for the user’s full request to be satisfied since the network is often configured to allow normal voice calls to take precedence over additional time slots for HSCSD users.

This contrasts with the more widely adopted GPRS. Retrieved from ” https: