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In addition to the [download speed](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/download-speed), the upload speed essentially determines the capacity and performance for an internet connection. It determines the amount of data a user can transmit to other services and connections over the internet within a specific amount of time. The upload speed in part also affects data reception, as some transmission protocols such as TCP use the upload port to acknowledge the data was received. If the upload bandwidth is so low the receipts cannot be sent promptly, the download speed will automatically be reduced. ### Asymmetric download and upload speeds with DSL connections DSL connections based on e.g. [ADSL](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/adsl) and VDSL, are asymmetric with different upload and download speeds. The download speed is typically a multiple of the upload speed. Since many applications primarily retrieve data from the internet and little data is actually transferred to the internet, asymmetric DSL connections are very common. However, these types of connection are inadequate for providing services via an internet connection. After all, in this case high upload speeds are required to transfer the information from the server over the internet and to the user. In this case, symmetric transmission technologies with equal download and upload speeds are a suitable solution. ### Importance of the upload speed in cloud telephony [Cloud telephony](/gb/en/products/cloudya) uses [Voice over IP (VoIP)](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/voice-over-ip) technology to transmit call information over the internet in form of data. Phone calls generally requires the same [bandwidths](/gb/get-started/cloud-telephony/lexicon/knowledge-base-detail/bandwidth) in both directions of transmission. If only one or few phone calls are made at the same time, the upload speed an asymmetric DSL connection is typically still adequate. However, when there are a lot of simultaneous phone calls, the connection should be configured to provide adequate upload and download bandwidth. ### Related Articles ### TCP/IP The acronym TCP/IP stands for Transmission Control Protocol/Internet Protocol and refers to a family of network protocols which are the basis for communication and data exchange over the internet as well as on private IP networks. The development of TCP/IP already began in the 1970s and traces back to the work of DARPA. Whilst the protocol family used to compete with alternative protocols such as AppleTalk by Apple, IPX/SPX by Novell or NetBEUI by Microsoft, TCP/IP has now established itself as a universal and worldwide popular protocol. It is platform-independent and available for devices with all operating systems imaginable. The reasons for the success of the protocol family are the victory of the Internet as well as its flexibility and versatility. 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