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'''High-Speed Circuit-Switched Data (HSCSD)''', nyaéta standar atawa téknologi nu mangrupa paningkatan tina standar [[Circuit Switched Data]], mékanisme pangiriman data dina sistem [[telepon mobil]] nu leuwih tiheula. Laju pangiriman datana opat kali leuwih gancang batan GSM, kalayan laju data '''nepi ka 38.4 Kbps'''.
 
Saru jeung [[Circuit Switched Data|CSD]], alokasi kanal dina HSCSD digawekeun dina jero modeu [[circuit switching|circuit switched]]. Bédana jeung CSD ngan dina kamampuh pikeun ngagunakeun padika-padika pangkodeuan ([[coding]]) nu béda-béda sarta / atawa multi [[time slot]] pikeun ngaronjatkeun [[throughput]] [[data]].
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Inovasi séjenna dina HSCSD nyaéta padika koréksi kasalahan nu béda-béda bisa dipaké pikeun pangiriman data. Koréksi kasalahan orisinil nu digunakeun dina GSM mah dirarancang dina kaayaan kawatesna wengkuan GSM. Hal ieu boga harti yén sabagian gedé kapasitas pangiriman GSM dieusian ku kodeu koréksi kasalahan. Sedengkeun HSCSD nyadiakeun tingkat koréksi kasalahan nu béda-béda nu bisa digunakeun gumantung kana kualitas tumbu radiona. Hartina, dina kaayaan nu pangalusna, laju 14.4 kbit/s bisa dihontal ku HSCSD ngaliwatan sahiji [[time slot]] nu mana dina CSD mah ngan mampuh mawa 9.6 kbit/s, pikeun ngaronjatkeun [[troughput]] saloba 50%.
As with [[Circuit Switched Data|CSD]], channel allocation is done in [[circuit switching|circuit switched]] mode. The difference comes from the ability to use different coding methods and/or multiple [[time slot]]s to increase data throughput.
 
Inovasi lianna dina HSCSD nyaéta kamampuh pikeun ngagunakeun multi [[time slot]] dina waktu nu bareng. Ku cara ngagunakeun salobana opat (4) [[time slot]], HSCSD bisa ngaronjatkeun laju pangiriman maksimum nepi ka 57.6 kbit/s (4 kali 14.4 kbit/s), sarta, sanajan dina kaayaan radio nu goréng nu merlukeun koréksi kasalahan undakan nu leuwih luhur, masih bisa nawarkeun paningkatan laju opat kali dibandingkeun CSD (38.4 kbit/s vs 9.6 kbit/s).
One innovation in HSCSD is to allow different error correction methods to be used for data transfer. 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. This means that a large part of the GSM transmission capacity is taken up with error correction codes. HSCSD provides different levels of possible error correction which can be used according to the quality of the radio link. This means that in the best conditions 14.4 kbit/s can be put through a single time slot that under CSD would only carry 9.6 kbit/s, for a 50% improvement in throughput.
Ku cara ngagabungkeun nepi ka 8 [[time slot]] GSM, kapasitas bisa dironjatkeun nepi ka 115 kbit/s.
 
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The other innovation in HSCSD is the ability to use multiple time slots at the same time. Using the maximum of four (4) time slots, this can provide an increase in maximum transfer rate of up to 57.6 kbit/s (4 times 14.4 kbit/s) and, even in bad radio conditions where a higher level of error correction needs to be used, can still provide a four times speed increase over CSD (38.4 kbit/s versus 9.6 kbit/s).
By combining up to 8 GSM time slots the capacity can be increased to 115 kbit/s.
 
HSCSD requires the time slots being used to be fully reserved to a single user. It is 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 so that normal voice calls take precedence over additional time slots for HSCSD users.