|E1 Voice Over IP|
The IP•Tube GE1-Ecan encapsulates full and fractional E1 circuits into IP packets. E1 Over IP connections provide for the interconnection of Channel Banks, PBXs and Telecom Switches via LANs, WANs, MANs, Satellite and Wireless Ethernet.
The IP•Tube GE1-Ecan ships with four E1 interfaces with Echo Cancellation and two 10/100 BaseT Ethernet Interfaces.
Echo is one of the most important factors that affects voice quality. The primary source of echo is the impedance mismatch at the hybrid that links a 2-wire analog loop to a 4-wire digital trunk. Echo Cancellation is essential for E1 circuit emulation that involves voice connections to the PSTN and delay in excess of 20 milliseconds. Packet networks that traverse an intranet or Internet backbone can easily exceed 20 milliseconds. The IP•Tube's Echo Cancellation provides the elasticity to support high quality voice connections across networks with significant delay and packet jitter.
The primary purpose to employ E1 Circuit Over Packet technology is to reduce or ideally eliminate the E1 leased circuit charges. For an enterprise utilizing their existing intranet is very compelling. Typically these intranets are already handling a very demanding load with significant packet jitter. The IP•Tube Echo Cancellation has jitter buffering greater than 100 milliseconds which is more than enough for the majority intranets and beyond the signaling delay tolerance of Voice PBX or Switch.
Choosing Wireless Ethernet for the transport of E1 Circuit Emulation is very popular since the circuit lease charges are eliminated. Commercial Off the Shelf Wireless Ethernet radios do not perform well with full duplex E1 circuit emulation packet traffic that is configured to keep the round trip less than 20 milliseconds. The IP•Tube's Echo Cancellation has the elasticity (Jitter Buffering and reduced Packet Frequency) to support the use of Wireless Ethernet for E1 Circuit Emulation.
Legacy phone equipment investment is preserved.
Central Site 4 port PBX to 4 remote locations
IP•Tube GE1-Ecan Standard Features
Dual LAN Interfaces
• Management interface on LAN port 2 when LAN port 1 is connected to a VPN tunnel
Assured Delivery Protocol
IP•Tube GE1-Ecan OPTIONS
Protector OPTION -PRO
The need to Protect Critical Communications is in high demand for the following applications:
• Public Safety Network Redundancy for Police, Fire and Medical
|On Demand Protection|
In “On-Demand” mode, the Protector only sends the duplicate packet stream over the second IP connection (LAN2 of the IP-Tube) if a failure is detected on the first IP connection. “On-Demand” connections can be used for cost savings or bandwidth reasons. For example, the expense associated with a backup IP Satellite connection for a full E1 (non-optimized E1 over IP requires 2.5 megabits per second) would dictate transmitting duplicate packets only during a failure condition.
Alternator Load Balancing OPTION -ALT
The IP•Tube GE1-Ecan Alternator option alternatively sends the IP packetized E1 frames on LAN 1 and LAN 2. The Alternator option enables fractional and full E1 circuits to be split over two IP WAN connections such as xDSL. The Lossless Data Compression option can be combined with the Alternator option to minimize the bandwidth required from the alternative paths.
Lossless Data Compression Option -C
Far End Echo Cancelling
IP•Tube GE1-Ecan utilizes Digital Signal Processors that detect and cancel echo at the far end so that the packet network delay has no impact on echo. The echo canceller samples the voice signal, estimates and removes the echo, leaving the original speech. The linear digital signal processor (DSP) models the echo and performs the main echo cancellation task. A non-linear DSP processor is then optimally employed to subtract out any residual echo or reflected noise components. Echo is one of the most important factors that affects voice quality. The presence of echo depends on both echo level and echo delay. The primary source of echo is the impedance mismatch at the hybrid that links a 2-wire analog loop to a 4-wire digital trunk. The hybrid is not completely efficient in carrying the electrical energy and a certain amount of the electrical energy, or voice signal, is reflected back and may be perceived as echo. Occasionally, acoustic feedback of certain phones also causes noticeable echoes. These sources of echo are able to be cancelled by the human brain as long as the time between our speech and the echoed speech is not greater than 32 milliseconds.
Engage's E1 Over IP products have a minimum delay configuration, 1 millisecond packetization and 4 packet buffering, which introduces a delay of 5 milliseconds. The amount of delay introduced by the packet network depends upon its switching times, packet processing, packet jitter, transmission, loading and quality of service configuration.
|E1 Private Line Services over IP|
Businesses, Education Districts, Universities, National, State and Local Government, incur significant recurring monthly costs for rigid-bandwidth leased lines used only for the interconnection of PBXs and Telecom switches.The IP•Tube GE1-Ecan provides enterprises with the ability to interconnect their existing phone systems over flexible bandwidth lines that are used to carry data, voice, and video. The Voice Only Leased Line Toll charges assessed by long distance and local carriers are eliminated or dramatically reduced by transporting voice traffic across LANs and WANs.
Broadband Service Providers
CLEC PBX Back Haul
Echo Cancellation enables Wireless connections to support E1 Over IP real time connections in a point to point or point to multipoint configuration with the elasticity required.