Echo Canceller with
Voice Quality Enhancement
Orion Telecom Networks Inc.
offers the industry's most compact DS3 Voice Quality Enhancement
(VQE) echo canceller solution in a 19-inch, 3U (133 mm height)
chassis, with echo tail-displacement (echo
tail off-set) feature which is user programmable from 0 ms. to 512 ms.
Echo cancellation on each channel is 128 ms. bidirectional (near-end and
far-end). The DS3
VQE and echo canceller solution offers a unique, user definable
echo-tail displacement feature which
may be programmed by the user, between 0 ms. to 512 ms. on the return
path to cancel echo-tails, both at the near-end and the far-end, even in
the most demanding network conditions.
Orion offers echo cancellation and voice
quality enhancement solutions for the following network situations:
- International Gateway
- IP Gateway
This solution is also an ideal echo cancellation solution for
long distance telephony, GSM, CDMA, TDMA, VoIP, satellite and radio
The VQE and Echo Canceller equipment is compliant to ITU-T G.164,
G.165, G.168 (2000/2002) and G.169 requirements for echo
cancellation. The echo canceller solutions offers carrier-grade
voice quality per AT&T Voice Quality Assessment Lab. Echo
cancellation on each channel is 128 ms. bidirectional.
128 ms. bidirectional
(near-end and far-end) echo cancellation with echo-tail
displacement from (tail off-set)
0 ms. to 512 ms.
Programmable echo-tail displacement (echo tail off-set) from 0
ms. to 512 ms.
Echo-Tail Displacement allows
user to program a delay off-set on return path and the user can
cancel near-end and far-end echo from single installation.
Ideally suited for GSM Networks
to eliminate "back ground noise" to enable GSM Networks to
function at half-rate (HR) with full rate voice quality thereby
doubling spectrum usage in GSM networks.
Echo Cancellation on each channel is 128 ms. bidirectional
(near-end and far-end).
Compliant to ITU-T G.164, G.165, G.168 (2000 / 2002) and G.169
requirement for echo cancellation.
Electrical Echo Cancellation
resulting from network delays and delays arising due to complex
voice compression algorithms in hybrid PSTN and long distance
Acoustic Echo Cancellation
required for mobile networks for cancelling echo-tails that
originate from cellular hand-sets designed with poorly designed
Programmable echo-tail displacement (near-end and far-end) from
0ms. to 512 ms.
Auto Voice Level Control and
VQE (Voice Quality Enhancement features) required for reducing
background noise from calls originating from crowded public
places or other noisy environments and maintaining a uniform
Voice level in a Network. Improves voice quality.
User programmable dedicated data channels.
Remote access through Telnet
VQE Echo Cancellers in a 3U (44mm) high chassis industryís
smallest foot print.
User Programmable signaling options.
ISDN (23B+D), C7 / SS7, CCS (C6,C7), RBS (E&M, PLR, FXS-GS, FXO-GS,
Orion offers the industry most
compact DS3 Echo Cancellers and voice quality enhancement (VQE)
DS3 voice quality enhancement VQE and Echo Cancellers 19 inch, 3U
(44mm) chassis, 128ms bidirectional echo canceller tail. DS3 Inputs
and Outputs are balanced 75 Ohms BNC connectors.
- Wirless : GSM, CDMA, TDMA and Cellular Base Stations.
- Digital Circuit Multiplication Equipment (DCME)
: Satellite Communications and Multiplexers.
- PCS, mobile, and digital cordless wireless systems.
- PBX and central office systems.
- Datacomm: Voice over Frame Relay, Voice over ATM and Voice
- Voice over ATM, Frame Relay or packet switching systems and
- Central Office and PBX: Network Trunks, Echo Canceller Pool,
Common Equipment and Audio Conferencing Bridges
- Voice over Datacomm including Voice over Internet (VoIP),
Voice over ATM (VoATM), and Voice over Frame Relay (VoFR).
- Voice over Frame Relay delays.
- Voice over ATM
- Voice over Internet / LAN
Satellite Communications Applications
- Digital Circuit Multiplication
- GSM, CDMA
- Digital Cordless and Cellular Base Stations
Central Office and PBX Applications
- Network Trunks
- Echo Canceller Pool
Voice Over ATM Applications
- A multi-channel echo canceller resource or pool is shared
among many channels to reduce cost.
- Echo cancellation is done at a DS0 level.
Voice Over Frame Relay, ATM Applications
- Frame Relay and ATM routers and switches introduce large,
variable, and unpredictable delays.
- Echoes from the Public Switched Telephone Network (PSTN) in
combination with the delays from Frame Relay and ATM equipment
yield objectionable speech quality.
VCL-EC-DS3, VQE and DS3 Echo Canceller
To Cancel the echoes at both ends (near-end and
of the Network with one 128 ms. bidirectional Echo Canceller
To Cancel the echoes at both ends of the Network with one 128 ms.
bidirectional Echo Canceller with user programmable Echo Tail
Displacement (Echo Tail Off-set) Features
VCL-EC-DS3 Echo Canceller offers User Programmable Echo Tail
Displacement feature, User Definable
Echo-Tail Displacement is selectable between 0 ms. to 512 ms. on the
return-path. This feature allows the user to cancel echo-tails in
BOTH directions (both near-end and far-end echo tails), even in most
demanding conditions that are common on VoIP networks and satellite
DS3 VQE & Echo Canceller per chassis - Features & Highlights
- USER PROGRAMMABLE ECHO TAIL
DISPLACEMENT (Echo Tail Off-set): User definable echo-tail
displacement is selectable between 0 ms. to 512 ms. on the return-path.
This feature allows the user to cancel echo-tails in both directions (both
near-end and far-end echo tails), even in most demanding conditions that
are common on VoIP networks and satellite links.
- USER PROGRAMMABLE SIGNALING OPTION:
The DS3 Echo Cancellers supports the following signaling protocols:
Signaling protocols supported: 672 (Voice Channels) with out-of-band
signaling (C7 / SS7 Signaling on any user selected time-slot), 23B+D, PRI
ISDN (23 Voice Channels+D Signaling Channel), D4 Robbed Bit Signaling. CCS
(C6,C7), RBS (E&M, PLR, FXS-GS, FXO-GS, FXS-LS, FXO-LS ). All signaling
options are User Selectable / User Programmable. Allows digital data
transmission on any individual user-selected time-slots.
- The DS3 Echo Canceller supports 2100 Hz
fax / analog data modem tone detection and echo canceller disabling on all
- USER PROGRAMMABLE DEDICATED DATA
CHANNELS: The user may specify / define the dedicated data channels so
that they are always and completely bypassed from the echo cancellation
circuitry - leaving those specifically assigned dedicated time-slots for
digital data transmission (including video transmission).
- Option for user to select voice echo
cancellation or digital-data transmission selectively on each time-slot
for selective echo cancellation. This feature allows the user to use
selected time-slots for data transmission to enable digital data / CCS
- Transmission (data mode), while keeping
the echo cancellation "ON" on the remaining time-slots (voice mode), on
which echo is required to be cancelled.
- Provides voice echo cancellation of up to
128 ms bidirectional (near-end and far-end echo canceller) for DS3.
- Meets ITU-T G.168 (2000 / 2002)
requirements for echo cancellation.
- Meets ITU-T G.169 specifications for VQE.
- Easy to use text based CLI commands for
management and configuration.
- Orion offers the industry most compact DS3
Echo Cancellers and Voice Quality Enhancement (VQE) solution.
- Voice Quality Enhancement :
- ANR: Automatic Noise Reduction. Removes
- ALC: Automatic level control (maintains
uniform VF levels)
- ALE: Automatic level enhancement
(maintains uniform VF levels)
- Hybrid Echo Cancellation
- Acoustic Echo Cancellation
- Removes undesirable background noise and
allows the natural background audio from the PSTN to pass through
unaltered to the mobile subscriber, making the call sound clearer.
- Automatic Level Control dynamically
adjusts speech levels up or down to the level optimal for the network,
improving speech clarity and intelligibility.
- Acoustic Echo Control eliminates acoustic
echo generating from digital mobile handsets and hands-free kits, enabling
- Noise Reduction reduces the background
noise on mobile calls, enhancing overall voice quality.
- 2, DS-3 Interfaces. This saves material
costs, configuration and set-up time and ongoing maintenance. Eliminates
the need to have multiple T1 interfaces, or T1 to DS3 multiplexers, Easy
to install. Easy to manage.
- Bidirectional echo cancellers have the
capability of canceling 128ms echo-tails in BOTH directions (on the
Transmit as well as the Receive paths), by installing them at a single
location. Our equipment's unique user programmable echo-tail off-set
feature allows bidirectional echo cancellation from a single
installation, in networks which may have end-to-end delays of even up to
512ms which are be usually found on satellite links and high latency VoIP
networks rendering the other echo cancellers, without this feature,
- Tone disabling per ITU-T, G.164 and G.165.
- Echo-tail displacement allows user to
program a delay off-set on return path and user can cancel near-end and
far-end echo from single installation.
- Signaling protocols supported:
- 672 Voice Channels with out-of-band
signaling (C7 / SS7 Signaling on any user selected time-slot)
- 23B+D, PRI ISDN (23 Voice Channels + D
- Robbed Bit Signaling
- CCS (C6, C7)
- RBS (E&M, PLR, FXS-GS, FXO-GS, FXS-LS,
- All signaling options are User
Selectable / User Programmable.
- Allows digital data transmission on
- Meets ITU-T G.164, G.165, G.168 (2000 /
2002) requirements for Echo Cancellation.
- Meets ITU-T G.169 specifications for Voice
- Ensures excellent voice quality from the
start of the call, during call transfer and cell hand-offs, and even after
abrupt changes in network routing.
- Delivers clear voice quality in the most
challenging network environments.
- Offers selection of voice quality
enhancements features that include automatic level control and background
noise reduction with acoustic echo control.
- Ideally suited for mobile (GSM and CDMA)
Networks to eliminate "back ground noise" to enable GSM Networks to
function at Half-Rate (HR) thereby doubling spectrum usage in GSM
Remote Monitoring and Control
- CLI Command Interface
- Local access through COM port (RS232
- Remote Access through a 10BaseT Port over
a TCP/IP network. Telnet.
- The system is supplied with an easy to use
Windows (95, 98, Me, XP) Graphical User Interface that provides the USER a
- Ensures echo canceller maintains excellent
performance at all times in presence of tones or signals including DTMF
- Improves voice quality performance on
circuits with poor echo return loss (ERL) and unbalanced send and receive
levels, resulting in improvement in service quality.
- Allows the use of a single Echo Canceller
installation to cancel echo-tails in both directions.
- Stable performance across all hybrid and
- Low per channel power consumption reduces
cooling and power costs.
- Compact size reduces footprint
Question. What is echo tail-displacement
(echo tail off-set)
Echo Tail-displacement (echo tail off-set) is an important feature
used in bidirectional echo cancellation, to make it effective and
useful for bidirectional echo cancellation.
as near-end and far-end automatic echo cancellation operation)
echo cancellers have the capability of canceling echoes in both
directions (on the Transmit as well as the Receive paths), by
installing them at a single location. Bidirectional echo cancellers
can be installed at a single location, either the Near-End or the
Far-End, and used to cancel both Near-End and Far-End echo-tails,
from a single installation.
Usually, satellite links and intercontinental VoIP circuits have
fixed network delays which exceed the capabilities of commonly
available (192 ms) echo cancellers for bidirectional
echo cancellation, thus making them unsuitable for bidirectional
intercontinental satellite or a VoIP link may have a fixed
end-to-end round-trip delay of 300 ms, thereby rendering all
commonly available echo cancellers, with even 192 ms
echo cancellation capabilities, in-effective for bidirectional
Using the Echo Tail-Displacement (echo tail off-set) feature, the
user may offset and account for the fixed round-trip network delay
on the return path so that the echo cancellation window on the
return-path is shifted by 300 ms., so as to allow the bidirectional
echo canceller to function effectively in both directions and to
cancel both near-end, as well as the far-end echo-tails on the
return path, even if the echo canceller is installed at the Near-end
in a given network.
Echo Tail-displacement (echo tail off-set) allows the user to
program a delay off-set on the return path, so that the user may
cancel both near-end and far-end echo-tail with a single Echo
Canceller installation. The echo tail-displacement allows the user
to compensate for the fixed network delays on the return path of the
echo-tail, so that the user can effectively cancel, both near-end
and far-end echoes using a single Echo Canceller without being
limited by the fixed end-to-end delay of that network link.
Orionís Echo Canceller has a user programmable "echo tail-end
displacement" (echo tail off-set) from 0 ms. to 512 ms.
This feature allows the use of a single Echo Canceller
installation to cancel echo-tails in both directions over
intercontinental satellite or VoIP links where the fixed network
delays are excessive (beyond and in excess of (example) 192 ms.
echo cancellation capability of the commonly sold bidirectional
Echo Canceller solutions).
Question. My Network has a total of
300ms. end-to-end delay. How can I use a 128ms. Bidirectional echo
canceller to cancel, both, near-end and far-end echoes?
The use of the "programmable echo tail-displacement" (echo tail
off-set) feature in our Echo Cancellers allow the user to cancel
echoes on the return path even if the network delays exceed 128 ms.
The fixed network delay shall be calculated ascertained and
programmed as the "echo tail-displacement" on the return path. This
shall allow the user to use a single Echo Canceller to cancel
echoes, bidirectionally, even if the total network end-to end delay
is in excess of 300 ms.
The Orion 128 ms., bidirectional Echo Canceller solution,
equipped with a user programmable " echo tail-displacement" feature
is superior than a simple single 192 ms. bidirectional Echo
Canceller solution for canceling both near-end and far-end echoes,
even if the fixed round-trip network delays exceed 300 ms.
(please see the example above).