Coms Xstream

What is Coms Xstream?

Coms Xstream reduces bandwidth overhead so that more calls can be made on a DSL line. In doing so Xstream also improves Quality of Service (QoS) as voice packets are treated with priority.

As ADSL is slower sending than receiving data (i.e. the uplink has lower bandwidth than the downlink), the number of calls that can be made is limited by the much slower uplink speed (typically 256K or 446k).

Business-Class & Qos Bandwidth Service

Bandwidth is an important issue because VoIP speech is encoded using a codec, the main two codec’s used being G.711 and G.729. G.711 is considered to be the highest quality codec, but it does not compress speech, so it is very bandwidth hungry; whilst G.729 is considered the best match between compression and quality.

When speech is sent over the internet there is still a “transport overhead” for each call that increases the bandwidth used by a VoIP call, however, Coms Xstream uses only one transport overhead for all calls, thereby maximising the available bandwidth.

Bandwidth Comparison:

How Coms Xstream Works?

Voice is no longer treated as simply another type of data which happens to have a high priority. Instead, it is treated as a data stream with very specific requirements not only in terms of priority, but also in terms of spacing between packets.

Voice and data can readily coexist on a single link. Data transfer rates are not compromised by the fact that voice is present. Classes of data can be given their own share of available bandwidth in a much more granular way than traditional QoS.

Customer Premises Equipment (CPE)

Key benefits of using Coms Xstream

• Enables up to 28 simultaneous calls on a standard 256k uplink ADSL connection.
• Enables delivery of SIP trunking up to 28 ports on a single ADSL connection with only 256k upstream bandwidth, making it a viable replacement for E1 circuits.
• Dynamic and seamless blending of Voice and Data using QoS allowing FULL utilisation of all purchased bandwidth increasing overall throughput for both voice and data traffic.
• Enables low broadband bandwidth to be used for VPN connectivity in branch / retail environments offering simultaneous Voice and Data access.
• Supports multiple Voice protocols.
• Increased security for both voice and data traffic.