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Valiant offers a compact, robust and cost effective E1 echo
canceller solution in 19 inch, 3U high chassis (accomodates up to 10, E1 echo cancellers
per shelf). Echo cancellation on each channel is 64ms
Bi-directional and 128ms. Uni-Directional echo
tails - user selectable. T1 echo cancellers are also offered
and available.
Valiant offers echo cancellation and voice quality
enhancement solutions for the following network situations:
- Wireline
- Wireless
- Satellite
- International Gateway
- IP Gateway
The echo canceller solutions are ideal for
long distance telephony, GSM, CDMA, TDMA, VoIP, satellite and radio communication
applications.
Type of E1 Echo Canceller offered - upto 10, E1 Cancellers per 19 inch 3U High Chassis
E1 echo canceller: 64ms Bi-directional and 128ms.
Uni-Directional - User Selectable. Our E1 echo canceller is a fully integrated 30
channel echo canceller that cancels echo up to 64ms. bi-directional / 128ms.
uni-directional - user selectable. E1 Inputs and Outputs are balanced 120 Ohms, RJ-45.
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Network
Interface - E1 Interface at 2048 Kbps
| Number of Interfaces |
2,
1 - Input (RJ-45)
1 - Output (RJ-45) |
| Line Rate |
E1 - 2.048Mbps |
| Line Code |
HDB3 |
| Conformity |
G. 703 |
| Frame Structure |
As per ITU-T G.704 |
| Signaling |
Pass-Through
(signaling protocols supported)
- 30B+D PRI ISDN (Euro ISDN) signaling,
- 31B (31 voice channels) with out-of-band signaling,
- R2 CAS signaling,
- SS7 signaling (on any user selected time-slot).
- All signaling options are User Selectable / User Programmable. |
| PCM Sampling Rate |
8000 samples / sec |
| PCM Encoding Law |
A Law as per ITU
(CCITT) G.711 |
| Bit Rate |
2048 kbps ± 50 ppm |
| Nominal Impedance |
120 ohms balanced (75
ohms optional available) |
Peak Voltage of a mark
For 120W Balanced Interface |
3.0 V ± 0.3 V |
Peak Voltage of a
space
for 120W Balanced Interface |
0 V ± 0.3 V |
| 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 |
| Permissible
Attenuation |
6 dB at 1 MHz |
Return Loss at:
51.2 KHz to 102.4 KHz
102.4 KHz to 2048KHz
2048KHz to 3072 KHz |
> 12dB
> 18dB
> 14dB |
| Jitter Tolerance |
As per ITU (CCITT)
G.823 |
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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 and Control |
RS232 serial interface for
management through a PC COM port |
Management Port Specifications
| RS232 COM Port |
Serial Port: 9.6kbps (Async)
ASCII / VT100 / Hyper Terminal |
| 10BaseT Ethernet |
Telnet |
Power
Consumption of E1 Echo Cancellers
| Number of echo cancellers in use |
Current (in AMPS) |
Power Consumption (in WATTS) |
| Input Voltage = -48
volts |
| 1 echo canceller, power supply,
NMS card |
0.15 |
6.0 |
| 10 echo cancellers, power supply,
NMS card |
0.825 |
39.6 |
Power
Supply
| Input DC voltage |
-48V DC ( nominal ) |
| Range of input |
-40V to -60V DC |
| Output voltages |
+5V |
| Full Load Output Current |
4A at +5V, (10, Echo Cancellers) |
| Input Voltage Reversal Protection |
Provided in the Card |
| Over Current Protection |
6A for +5V |
| Short Circuit Protection |
Current limit - 6A. Recovers on
removal of short |
| Under Voltage |
< 4.5V |
| Over Voltage |
5.4V to 5.6V |
| Efficiency at full load |
>70% |
| Ripple at full load |
<5mVrms |
| Spike at full load |
<50mV |
| Power Consumption |
40W (Nominal) (10, Echo
Cancellers) |
Mechanical Specifications
| Rack Mounting |
Standard 19 Inch. DIN Rack |
| Height |
133.35mm |
| Depth |
292mm |
| Width |
482mm |
| Weight (Net) |
7.50 Kg. (10, Echo Cancellers) |
Echo Canceller
Technical Specification
- Provides voice echo cancellation of up to 64ms. / 128ms.
- Conforms to ITU-T G.165 and G.168
- G.164 / G.165 disable tone detection
- Non-Linear Processor with Comfort Noise Insertion
- Narrow-Band Detector
- Eliminates long echo tail.
E1 Echo Canceller - Highlights
- 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:
- 30B+D PRI ISDN (Euro ISDN) signaling,
- 31B (31 voice channels) with out-of-band signaling,
- R2 CAS Signaling,
- SS7 signaling (on any user selected time-slot).
- 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.
- Remote access through telnet over LAN / TCP-IP link
(10/100BaseT)
- Local access through COM port (RS232 serial port)
- 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
- Redundant Power Supply (Optional)
- E1 link by-pass on power failure. This feature helps to
maintain the link integrity even in the event of power failure
- Automatic E1 link by-pass upon removal of power supply
- Transmission (data mode), while keeping the echo
cancellation "ON" on the remaining time-slots (voice mode), on which echo is
required to be cancelled
- Fully integrated independent 30-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)
Redundancy
The echo canceller is equipped to offer
redundant power supply (optional).
Related Links
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