Broadband may seem like an ideal solution for connecting multiple sites for voice and data, including VoIP links to external telephony providers. However, using voice and data over an ADSL network presents several challenges:
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- Asymmetric Bandwidth: ADSL offers significantly lower upstream bandwidth compared to downstream. Since voice calls require symmetrical bandwidth, the number of concurrent calls is limited by the slower upload speeds, typically around 256 Kbps.
- Bandwidth Requirements: Although voice data can be compressed to as little as 8 Kbps per call (using techniques similar to MP3 compression), the overhead for packaging and transmitting voice over broadband increases the actual usage to at least 42 Kbps per call.
- Quality of Service (QoS) Limitations: For voice and data to coexist on the same network, QoS must be implemented. However, standard QoS methods perform poorly on links with less than 1000 Kbps, and even at higher speeds, they are not ideal. Delays in sending voice data lead to degraded call quality. Additionally, QoS typically cannot allocate more than 70% of available bandwidth, meaning a standard broadband link can only support up to three calls, and even then, the quality suffers when data is also being transmitted.
- Lack of QoS on Downloads: On standard BT Wholesale broadband connections, QoS cannot be applied to the download direction, further impacting voice quality.
- Security Risks: Broadband networks, often part of public or shared infrastructure, raise concerns about data security.
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