E1 Echo Canceller

Echo Cancellation

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.

The IPTube’s Echo Cancellation provides the elasticity to support clear connections across networks with significant delay and packet jitter.

The IP•Tube DLE1-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
Companies, that are able to provide IP Ethernet access networks generate new revenue by offering traditional E1 leased line and private line services, such as: 

Cable Operators
Cable operators connect traditional E1 leased line and private line services over their hybrid fiber coax (HFC) cable networks. HFC Cable network latency typically requires echo cancellation. 

Metropolitan Area Networks
Metropolitan carriers with IP or Ethernet access networks deliver traditional leased line and private line services. 

Utilities
Utilities generate new revenue by offering traditional E1 leased line and private line services over their fiber or power line networks.

CLEC PBX Back Haul

The IP•Tube DLE1-Ecan provides CLECs with a way to back haul E1 DS0s from a customer’s phone systems over their Internet connection. The back hauled DS0s are connected to the CLECs phone switch for connection to the Public Switched Telephone Networks. Local Exchange Carriers are able to offer an economical alternative to the local Phone Company.

LAN Network Interface: 
• Two 10/100BaseT Full/Half Ethernet
• Autonegotiation or Configurable Speed and Duplex 

LAN Network Protocols Supported:
• IP, TCP, UDP, ICMP
• Assured Delivery Protocol 
• DHCP
• DNS Address Discovery
• Dynamic DNS 

Echo Canceller:
• Voiceband Echo Cancelling according to ITU G.165 and G.168
• u- and A-Law coding according to ITU G.711
• 32 channels with end echo path delay of less than 63.75 ms 

E1/Fractional E1 Specifications: 
• One or two G.703 Port 120/75 ohm Models
• Connects directly to E1 or DS1
• Framing - CRC4 or FAS or UnFRAMED
• Coding - HDB3 or AMI
• Supports DS0 assignments from 1 to 31
• Not Contiguous Configuration x-y,z

Supported E1 Over IP Protocol:
• TDM Over IP
• Circuit Extension Services Over IP - CESOIP
• HDLC Over IP - HDLCOIP
• Frames Per Packet Configurable 8 to 40
• Low Latency Mode: 1 millisecond 8 E1 frames
• Max Payload Mode: 5 millisecond 40 E1 frames
• Comprehensive Clocking: Internal, Network, Adaptive

Lossless Data Compression Option:
• Detects idle and redundant data within each DS0
• Configurable Silence Detection Range
• Interconnect bandwidth is not consumed by silent or redundant data
• Compression settings from 8 to 1 to 40 to 1

-PRT