• T1 Echo Cancellers 1U

T1 Echo Canceller 1U - Technical Specifications

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T1 Echo Canceller 1U
Technical Specifications

T1 Echo Canceller 1U

Orion Telecom Networks Inc. offers offer latest compact, robust and cost effective T1 Echo Canceller solution in 19 inch, 1U high (44mm height) chassis (accommodates 1, T1 Echo Canceller with telnet, per chassis). Echo cancellation on each channel is 64ms. Bidirectional / 128ms. Unidirectional echo tails - user selectable.

Network Interface

Number of Interfaces 2,
1 - Input (RJ-45)
1 - Output (RJ-45)
Line Rate T1 - 1.544 Mbps
Line Code B8ZS, AMI (User Selectable)
Frame Structure D4, ESF (User Selectable)
Signaling Pass-Through: Signaling protocols supported:
- 24B (24 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.
- All signaling options are User Selectable
PCM Sampling Rate 8000 samples / sec
Bit Rate 1544 Kbps + 50 ppm
Nominal Impedance 100 Ohms Balanced RJ-45
Nominal Pulse Width 244 ns
Pulse Mask As per ITU (CCITT) rec. G.703
Output Jitter < 0.05 UI (in the frequency range of 20Hz to 100 KHz)
Jitter Tolerance As per ITU-T G.823
Output Jitter < 0.05 UI (in the frequency range of 20Hz to 100 KHz)
Loss and recovery of frame alignment As per clause 3 of ITU (CCITT) G.732
Loss and recovery of multiframe alignment As per clause 5.2 of ITU (CCITT) G.732

Echo Cancellation

Echo Tail Cancellation 64ms Bi-Directional / 128ms Uni-Directional - User Selectable / User Programmable.
Tone Disabler As per ITU-T G.164, G.165
ERLE (Echo Return Loss Enhencement) >35dB (with 6dB ERL) at -10dBm0 input
>65dB with NLP enabled
ERL (Echo Return Loss) Selectable Level Options: 0, 3, 6dB
Transmit / Receive Levels (Programmable) Selectable Level Options: -12, -9, -6, -3, 0, +3, +6, +9
Comfort Noise Insertion User Selectable - On / Off
Local Monitoring RS232 serial interface and USB Port
Remote Monitoring 10/100BaseT Ethernet Port
Local and Remote Provisioning CLI (text commands) and GUI
Front Panel Indicators - In SYNC/Failure
- LEDs for power on/off
Environmental-Operational 00 C to 500 C
Humidity 5% to 95%, non-condensing

Management and Control

Remote access through telnet over LAN/TCP-IP link (10/100BaseT)
Local access through COM Port (RS232 serial port) and USB Port

DC Power Supply Specifications

Input DC voltage -48V DC (nominal)
Range of input -40V to -60V DC
Input Voltage Reversal Protection Provided

AC Power Supply Specifications

Range of input AC voltage 100 V to 240 V AC, 50Hz / 60Hz.
Connector Type 3 PIN AC Socket (IEC 60320 C14)
Efficiency at full load > 86%

Power Consumption of T1 Echo Cancellers

Number of echo cancellers in use Current (in AMPS) Power Consumption (in WATTS)
 - 48V DC 0.15 6.0
220V AC 0.03 39.6

Mechanical Specifications

Rack Mounting Standard 19 Inch. DIN Rack
Height 44 mm
Depth 260 mm
Width 480 mm
Weight 4 Kgs.

Hardware Highlights

T1 Echo Canceller - Highlights

  • Compact T1 echo canceller solution in 19 inch, 1U high (44mm height) chassis and accommodates 1, T1 echo canceller with telnet, per shelf.
  • Provides voice echo cancellation of up to 64ms Bi-Directional / 128ms Uni-Directional - User Selectable / User Programmable.
  • Meets ITU-T G.164, G.165, G.168 (2000 / 2002) requirements for echo cancellation.
  • Signaling protocols supported:
    • 24B (24 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 user-selected time-slots.
  • The echo canceller supports fax / modem G.164 and G.165 (2100 Hz) tone disable.
  • Carrier-grade voice quality per AT&T Voice Quality Assessment Lab.
  • Local access through COM port (RS232 serial port) and USB Port
  • Remote access through telnet over LAN/TCP-IP link (10/100BaseT)
  • Easy to use text based CLI commands for management and configuration.
  • Adjustable gain/loss settings on all channels. Provides the user the flexibility to adjust and optimize the voice, transmit and receive levels.
  • Non-Linear Processor with Comfort Noise Insertion.
  • T1 link by-pass on power failure. This feature helps to maintain the link integrity even in the event of power failure.
  • 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 signaling transmission.
  • Transmission (data mode), while keeping the echo cancellation "ON" on the remaining time-slots (voice mode), on which echo is required to be cancelled.
  • Ensure echo canceller maintains excellent performance at all times in presence of tones or signals including DTMF tones.
  • Fully integrated independent 24-channel voice echo canceller.

Fault Recovery

The echo canceller equipment offers fault recovery feature. It offers automatic by-pass upon power-supply failure (i.e. it offers E1 circuit by-pass in the event of power supply failure).

Remote Monitoring and Control

  • Remote access through telnet over LAN/TCP-IP link (10/100BaseT)
  • Local access through COM Port (RS232 serial port) and USB Port

Unique T1 Echo Canceller Features:

USER PROGRAMMABLE TAIL DISPLACEMENT: User definable echo-tail displacement is selectable between 0ms. to 896ms. 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 T1 echo cancellers supports the following signaling protocols: Signaling protocols supported: 24B (24 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 user-selected time-slots.

USER PROGRAMMABLE DEDICATED DATA CHANNELS: The User my 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).

The T1 echo canceller supports 2100 Hz fax / analog data modem tone detection and echo canceller disabling on all channels.

Applications for the T1 Echo Cancellers

  • Wireless: GSM, CDMA, TDMA, PCS, and Cellular Base Stations.
  • Digital Circuit Multiplication Equipment (DCME) : Satellite Communications and Multiplexers.
  • PCS, cellular, mobile, and digital cordless wireless systems.
  • PBX and central office systems.
  • Datacomm: Voice Over Frame Relay, Voice Over ATM, and Voice Over Internet.
  • Voice over ATM, Frame Relay or packet switching systems and fax transmissions.
  • 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).

Datacomm Applications

  • Voice Over Frame Relay
  • Voice Over ATM
  • Voice Over Internet / LAN

Central Office and PBX Applications

  • Network Trunks
  • Echo Canceller Pool
  • Common Equipment
  • Audio Conferencing Bridges

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

Satellite Communications Applications

  • Digital Circuit Multiplication Equipment (DCME)

Wireless Applications

  • GSM, CDMA, TDMA
  • Digital Cordless and Cellular Basestations

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.

Data Sheet

Data Sheet (PDF)