The award-winning Extricom Wireless LAN System incorporates multiple breakthrough innovations in a system that raises the bar for WLAN performance, flexibility, and ease of ownership.
Groundbreaking architectural thinking gives you a solution that is fully IEEE 802.11-compliant, but changes all of the paradigms about the Wi-Fi experience.
Provides stable, guaranteed performance, enabling the industry's first Service Level Agreement (SLA) for WLAN users.
Easy to deploy and maintain, without the complexities of RF cell planning.
Delivers both seamless mobility and high capacity, with blanket coverage and no co-channel interference.
Built for enterprise triple play, without performance trade-offs.
WLAN you can count on... just like a wired network... anywhere in your facility
In short, Extricom enables the All-Wireless Enterprise today. Voice (VoWLAN), data, and video, and location services are delivered with an always-on, robust and mobile Wi-Fi connection to any client, in any environment. The Interference-Free™ WLAN System is purpose-built to slash wireless complexity and future-proof your network for tomorrow's multi-service demands.
A New Generation of Business Value
A new generation of applications, such as voice over Wi-Fi, locationing, "access anywhere" data connectivity, and multimedia communications, requires a new type of WLAN.
At the heart of the Extricom solution is a simple yet powerful idea: eliminate the concept of cell-planning, and replace it with Channel Blanket™ architecture. In the Channel Blanket, each Wi-Fi radio channel is used on every access point to create continuous "blankets" of coverage.
The sophisticated Extricom WLAN Switch tightly controls a set of multi-radio 802.11 a/b/g/n UltraThinTM Access Points (APs), to deliver a series of industry firsts:
Multi-layer WLAN, composed of multiple overlapping Channel Blankets on any combination of channels in any band, powered from the same the set of access points.
No AP-to-AP handoff, which ensures seamless mobility, continuity of security session, and optimal service delivery.
The elimination of co-channel interference, the critical component to providing complete coverage, maximum bandwidth, and guaranteed connection rate and bandwidth
TrueReuse™ channel processing, which multiplies per-channel capacity by enabling frequency re-use at higher density than traditional cell-planning.
Simpler. Better. Guaranteed. This is the Extricom Experience.
Friday, 29 January 2010
Monday, 25 January 2010
The Problems Associated with Broadband ( ADSL ) Links and Voice
On the face of it, broadband should be a medium which is ideally suited for linking multiple sites for the purposes of voice and data, as well as VoIP links to external telephony providers. However, there are some very real problems associated with using voice and data over an ADSL network.
The asynchronous nature of ADSL means that there is much lower bandwidth upstream when compared to down. Since voice calls are by their very nature symmetrical in terms of bandwidth requirements, the number of simultaneous conversations that can be maintained is limited by the much slower upload speed ( typically 256Kbit/s. )
Voice information can be compressed ( using similar techniques to MP3 music compression ) to use only 8kbit/s per call. However, due to the way in which it is packaged to be sent over a broadband network, the reality is that each call will use at least 42kbit/s – significantly higher.
In order to allow voice and data to share the same network, QoS has to be employed. Standard QoS techniques do not work very well for voice carried over links with less than about 1000Kbit/s, and are not ideal even well above that. The effect of this is that voice information gets delayed because it has to wait for a free slot on the link in order to be sent – since peoples voices do not generally incorporate such delays this causes issues with voice quality.
In addition, standard QoS techniques can not allocate more than 70% of the available link bandwidth reliably. This means that on a standard broadband link, three calls is the absolute maximum that can sensibly be achieved, and the quality of those calls will still suffer where data is present.
On a standard BT Wholesale broadband link, no QoS can be applied in the download direction.
Broadband is usually part of a public or at least shared network, making security a concern.
How ViBE Technology Helps
Vibe ( Voice over IP Broadband Enhancement ) solves these problems in several important ways:
Quality of Service is implemented in a completely different way to traditional methods, being much more suited to slower links.
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.
The bandwidth budget required is reduced to that of the compression format used, so that a G.729 call really does only use 8Kbit/s over the ADSL link rather than the 42Kbit/s which is more usual. Rather than a maximum of three calls, twenty-eight calls are now practical on a single broadband line.
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.
Sites that have Vibe links can be joined together to form private networks, which means that security is easier to control.
Backup links can be implemented which can be activated without losing calls in progress.
Much more of the capacity of the link can be used.
Future development of the technology will allow multiple links to be used as a single large bandwidth connection, offering a viable alternative to costly private circuits.
The asynchronous nature of ADSL means that there is much lower bandwidth upstream when compared to down. Since voice calls are by their very nature symmetrical in terms of bandwidth requirements, the number of simultaneous conversations that can be maintained is limited by the much slower upload speed ( typically 256Kbit/s. )
Voice information can be compressed ( using similar techniques to MP3 music compression ) to use only 8kbit/s per call. However, due to the way in which it is packaged to be sent over a broadband network, the reality is that each call will use at least 42kbit/s – significantly higher.
In order to allow voice and data to share the same network, QoS has to be employed. Standard QoS techniques do not work very well for voice carried over links with less than about 1000Kbit/s, and are not ideal even well above that. The effect of this is that voice information gets delayed because it has to wait for a free slot on the link in order to be sent – since peoples voices do not generally incorporate such delays this causes issues with voice quality.
In addition, standard QoS techniques can not allocate more than 70% of the available link bandwidth reliably. This means that on a standard broadband link, three calls is the absolute maximum that can sensibly be achieved, and the quality of those calls will still suffer where data is present.
On a standard BT Wholesale broadband link, no QoS can be applied in the download direction.
Broadband is usually part of a public or at least shared network, making security a concern.
How ViBE Technology Helps
Vibe ( Voice over IP Broadband Enhancement ) solves these problems in several important ways:
Quality of Service is implemented in a completely different way to traditional methods, being much more suited to slower links.
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.
The bandwidth budget required is reduced to that of the compression format used, so that a G.729 call really does only use 8Kbit/s over the ADSL link rather than the 42Kbit/s which is more usual. Rather than a maximum of three calls, twenty-eight calls are now practical on a single broadband line.
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.
Sites that have Vibe links can be joined together to form private networks, which means that security is easier to control.
Backup links can be implemented which can be activated without losing calls in progress.
Much more of the capacity of the link can be used.
Future development of the technology will allow multiple links to be used as a single large bandwidth connection, offering a viable alternative to costly private circuits.
Friday, 22 January 2010
Digium Switchvox Unified Communications system enhances user experience
Digium Switchvox system - new 4.5 version features greater handset support
Switchvox SMB 4.5 Extends the Power of the Web Interface to Phone Handsets
Digium’s Switchvox® SMB 4.5 is a powerful, full-featured and cost-effective VoIP Unified Communications (UC) solution designed for small- to mid-sized businesses. Switchvox SMB 4.5 delivers greater flexibility for your office communications, extending control of mission-critical applications traditionally accessed through the web interface directly to phone handsets.
Based on Digul’s Asterisk, the world’s most popular open source telephony engine, Switchvox SMB is a powerful IP PBX that integrates an easy-to-use web interface with innovative UC features such as fax, chat and video calling.
Phone Feature Packs extend the power of Switchvox to Polycom phone handsets
The new Phone Feature Packs extend the power of the Switchvox to Polycom phone handsets for maximum control of the communications system. Features that were previously only available through the web interface are now made available through Phone Feature Packs to these phone handset displays. Users can easily access powerful features from their phone handsets, such as call recording, visual voicemail, a searchable company directory and call parking lots. New options for more fundamental phone functions, such as hands free click-to-call dialing, distinctive ringtones for different types of calls, extension failover to a backup Switchvox SMB server, and support for multiple extensions on a single handset, are also available in version 4.5.
Check out these other powerful Switchvox SMB 4.5 features!
· User profiles— Caller profile information such as photo, extension, title and location. This appears on the Switchboard and on the display of Polycom phones with Phone Feature Packs on internal calls.
· Flexible language support— The Switchvox 4.5 GUI, manual, and inline help are available in English, UK English, Italian, Castilian Spanish, and Latin American Spanish. Sound packs, which include all the audio prompts used in the system, are available for these languages, as well as Australian English, French, and French Canadian. For businesses with international offices, users can customize their language settings to best complement their location and language preference.
· Comprehensive monitoring—Digium has implemented the Simple Network Management Protocol (SNMP) for Switchvox 4.5, which gives administrators the ability to collect real time data about the status and health of their systems. For a comprehensive description of features, please visit www.digium.com/switchvox:
For more detail contact VCOMM on : +44 (0) 1635 232 430 or sales@vcomm.co.uk
Switchvox SMB 4.5 Extends the Power of the Web Interface to Phone Handsets
Digium’s Switchvox® SMB 4.5 is a powerful, full-featured and cost-effective VoIP Unified Communications (UC) solution designed for small- to mid-sized businesses. Switchvox SMB 4.5 delivers greater flexibility for your office communications, extending control of mission-critical applications traditionally accessed through the web interface directly to phone handsets.
Based on Digul’s Asterisk, the world’s most popular open source telephony engine, Switchvox SMB is a powerful IP PBX that integrates an easy-to-use web interface with innovative UC features such as fax, chat and video calling.
Phone Feature Packs extend the power of Switchvox to Polycom phone handsets
The new Phone Feature Packs extend the power of the Switchvox to Polycom phone handsets for maximum control of the communications system. Features that were previously only available through the web interface are now made available through Phone Feature Packs to these phone handset displays. Users can easily access powerful features from their phone handsets, such as call recording, visual voicemail, a searchable company directory and call parking lots. New options for more fundamental phone functions, such as hands free click-to-call dialing, distinctive ringtones for different types of calls, extension failover to a backup Switchvox SMB server, and support for multiple extensions on a single handset, are also available in version 4.5.
Check out these other powerful Switchvox SMB 4.5 features!
· User profiles— Caller profile information such as photo, extension, title and location. This appears on the Switchboard and on the display of Polycom phones with Phone Feature Packs on internal calls.
· Flexible language support— The Switchvox 4.5 GUI, manual, and inline help are available in English, UK English, Italian, Castilian Spanish, and Latin American Spanish. Sound packs, which include all the audio prompts used in the system, are available for these languages, as well as Australian English, French, and French Canadian. For businesses with international offices, users can customize their language settings to best complement their location and language preference.
· Comprehensive monitoring—Digium has implemented the Simple Network Management Protocol (SNMP) for Switchvox 4.5, which gives administrators the ability to collect real time data about the status and health of their systems. For a comprehensive description of features, please visit www.digium.com/switchvox:
For more detail contact VCOMM on : +44 (0) 1635 232 430 or sales@vcomm.co.uk
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