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high bit rate (HBR)

The High Bit Rate (HBR) specification is used in various technologies and is to be interpreted as referring to a mode of operation or a special technology with a high bit rate. The specification can be found in DisplayPort, in the various DSL techniques, in the OTH hierarchy, and in All Optical Networks, to name a few.

In DisplayPort and Embedded DisplayPort, the term High Bit Rate (HBR) refers to a bandwidth specification. It was introduced and implemented in video cards as early as DisplayPort 1.0 and 1.1, and High Bit Rate (HBR) was replaced by HBR2 and HBR3 in subsequent versions. Since 2014, HBR2 has been implemented in most video cards, whereas HBR3 was introduced in 2016.

Bandwidth represents the data rate at the output of the DisplayPort, which is a shared bandwidth that can be shared by multiple monitors. The resolution and refresh rate of each monitor can be different. The data throughput of HBR2 is 5.4 Gbit/s per lane, while that of HBR3 is 8.1 Gbit/s. Thus, the total throughput for four channels is 21.6 Gbit/s gross for HBR2 and 32.4 Gbit/s gross for HBR3. Net of overhead, it is 25.9 Gbit/s.

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Englisch: high bit rate - HBR
Updated at: 06.04.2020
#Words: 268
Translations: DE