IP•Tube GT1-Ecan

The IP•Tube GT1-Ecan encapsulates full and fractional T1 circuits into IP packets. T1 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 GT1-Ecan ships with four T1 interfaces with Echo Cancellation and two 10/100 BaseT Ethernet Interfaces. 

The IP•Tube GT1-Ecan has four independent integrated T1 Echo Cancellers that cancel up to 64 milliseconds of Far End echo.  The Echo Canceller DSP detects and cancels echo at the far end so that the interconnecting packet’s network delay and jitter has no impact on echo. The echo canceller meets ITU-T G.164, G.165 and ITU-T G.168 requirements for echo cancellation.

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 T1 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 T1 Circuit Over Packet technology is to reduce or ideally eliminate the T1 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 T1 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 T1 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 T1 Circuit Emulation.

The IP•Tube GT1-Ecan’s transparent operation maintains the proprietary signaling required to support PBX features such as call conferences, call forwarding, caller ID and SS7.

Robbed Bit, PRI ISDN, SS7, and Proprietary out of band are supported. Echo cancellation is automatically disabled during FAX and Modem communications. Transparent support for Modem or Fax. Voice quality is not compromised.

Legacy phone equipment investment is preserved.

The IP•Tube GT1-Ecan's transparent operation maintains the proprietary signaling required to support PBX features such as call conferencing, call forwarding, caller ID and SS7. Legacy phone equipment investment is preserved. Transparent support for Modem, Fax, or Data circuits. Voice quality is not compromised. 

In order to assure high quality communications over links with intermittent or noisy performance, such as Wireless Ethernet. The IP•Tube GT1-Ecan employs Engage’s robust Assured Delivery Protocol with the following benefits:

• Packet out of sequence detection and re-sequencing
• Lost packet retransmission with configured delay

The Protector option provides for automatic protection of the T1 circuit over independent IP packet routes. After conversion of the T1 circuit into IP packets, two identical packet streams are created. These duplicate packet streams are used to provide redundant IP connectivity to the remote location in either “Always-On” or “On-Demand” switch over modes.

The need to Protect Critical Communications is in high demand for the following applications:

• Public Safety Network Redundancy for Police, Fire and Medical
• Auto Recovery for Military Communication
• Delivering on Service Level Agreements
• Resilient Cellular Backhaul

In “Always-On" mode, the Protector sends two identical packet streams simultaneously on the LAN1 and LAN2 ports of the local IP•Tube GT1-Ecan-Pro. The remote unit monitors both LAN1 and LAN2 incoming traffic and on a packet by packet basis selects the best packet to use for conversion from IP back to T1. In most cases, switching of the receive packet source between LAN1 and LAN2 can be done without T1 circuit interruption.

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 T1 (non-optimized T1 over IP requires 2.5 megabits per second) would dictate transmitting duplicate packets only during a failure condition.

The IP•Tube GT1-Ecan Alternator option alternatively sends the IP packetized T1 frames on LAN 1 and LAN 2. The Alternator option enables fractional and full T1 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.

The IP•Tube GT1-Ecan continuously detects idle and redundant data within each T1 Voice circuit resulting in as much as a 56 to 1 bandwidth savings.TDM over IP WAN bandwidth is not consumed by silent or redundant circuits. (Note: Compression only supported with IP•Tube GT1-Ecan-C models)