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Anonymous users2024-02-06They all belong to the category of DSL (Digital Subscriber Line), which is a combination of transmission technologies with copper ** wire as the transmission medium, including HDSL, SDSL, VDSL, ADSL and RADSL, etc., generally known as XDSL. The main differences between them are the difference in signal transmission speed and distance, and the difference in the symmetry of the uplink rate and downlink rate.
Let's focus on the differences:
1、adsl
ADSL supports uplink rates from 640kbps to 1Mbps and downlink rates from 1Mbps to 8Mbps on a pair of copper wires, with an effective transmission distance of 3 5 km.
2、vdsl
VDSL is the fastest of the XDSL technologies, with a rate of 13 to 52 Mbps for uplink data and up to Mbps for downlink data on a pair of copper twisted-pair cables, but the transmission distance of VDSL is only within a few hundred meters.
3、hdsl
HDSL supports symmetrical transmission with an effective transmission distance of 3 4 kilometers and requires two to four pairs of copper twisted-pair** cables, making it suitable for commercial environments.
In general, ADSL is suitable for home use, VDSL is fast, but the transmission distance is short, and the HDSL is symmetrical uplink and downlink, which is suitable for commercial use.
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Anonymous users2024-02-05ADSL, Asymmetric Subscriber Digital Line, VDSL, Very High Speed Digital Subscriber Line. All are asymmetrical DSLs
Comparison of VDSL technology with ADSL technology.
Data transfer rate.
The rate of VDSL asymmetric downlink data is, and the rate of uplink data is.
Mbps, the rate of symmetric data is.
The ADSL has an uplink rate of 100m and 800Kbps, and a downlink rate of 1Kbps and 8Mbps.
Line selection ratio. Due to the short distance, VDSL technology can also overcome the problems of low line selection rate and unstable rate of ADSL technology.
Transmission mode. VDSL supports symmetric and asymmetric transmission, while ADSL only supports asymmetric transmission.
Operating frequency band. ADSL uses a frequency band higher than 3kHz to transmit digital signals, and VDSL uses a higher frequency band on twisted pairs, from.
Compatible with businesses. Compared with ADSL, VDSL is compatible not only with existing traditional voice services, but also with ISDN services.
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Anonymous users2024-02-04The main differences between VDSL (ADSL) and their main differences are reflected in the difference in signal transmission speed and distance, as well as the difference in the symmetry of upstream and downstream rates.
ADSL residents are more suitable.
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