Comarra Limited provides robust
and cost effective E1 echo canceller and voice quality enhancement solutions for
the long distance, wireline, wireless, (GSM, CDMA, TDMA), VoIP, satellite and radio
communications. The echo canceller equipment is compliant to ITU-T
G.164, G.165, G.168 (2000 / 2002) requirements for echo cancellation.
The echo canceller |
 |
| solutions
offers carrier-grade voice quality per AT&T Voice Quality Assessment
Lab. The echo canceller supports fax / modem G.164 and G.165 (2100 Hz)
tone disable function. |
Network Interface
| Number of Interfaces |
2,1 - Input (RJ-45),1 - Output (RJ-45) |
| Line Rate |
E1 - 2.048 Mbps |
| Line Code |
HDB3 as per ITU-T G.703,
G.704 |
| Frame Structure |
As per ITU-T G.703, G.704 |
| PCM Encoding Law |
A Law as per ITU-T G.711 |
| 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 |
| Bit Rate |
2048 Kbps ± 50 ppm |
| Jitter Tolerance |
As per ITU-T G.823 |
| Output Jitter |
< 0.05 UI (in the frequency range of 20Hz
to 100 Khz) |
| Nominal Line Impedance |
120 Ohms Balanced RJ 45 |
| Nominal Pulse Width |
244 ns |
| Pulse Mask |
as per ITU (CCITT) Rec. G.703 |
| 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 |
Mechanical Specifications
| Height |
44.4 mm. |
| Depth |
246 mm. |
| Width |
128 mm. |
| Weight |
825 gms. |
Echo Cancellation
| Echo Tail Cancellation |
Up to 64ms Bi-directional / 128ms Uni-directional - User Selectable |
| Tone Disabler |
As per ITU-T G.164, G.165 |
| ERLE (Echo Return Loss
Enhancement) |
>35dB (with 6dB ERL) at 10dBm0
input
>65dB with NLP enabled |
| ERL (Echo Return Loss) |
Selectable Levels Options : 0, 3, 6 dB |
| Transmit / Receive Levels
(Programmable) |
Selectable Levels Options : -12,
-9, -6, -3, ,0 +3, +6, +9 |
| Comfort Noise Insertion |
User Selectable - Enable/Disable |
| Local Monitoring and Control |
RS232 serial interface for Management through
a PC COM Port |
| Local and Remote Provisioning |
CLI (text commands) and GUI |
| Front Panel Indicators |
- In SYNC / Failure
- LEDs for power on/off |
| Environmental - Operational |
0° C to 50° C |
| Humidity |
5% to 95%, non-condensing |
AC Adapter Power Supply Specifications
| Input AC voltage |
100 - 240 Volt AC |
| Range of Input Voltage |
100 V To 240 V AC |
| Output voltages |
7.5 VDC to 9.0 V DC |
| Maximum Full Load Output Current |
2.5 A at 7.5 VDC / 9.0 V DC |
| Input Voltage Reversal Protection |
Provided in the Card |
| Efficiency at full load |
>86% |
Management Port Specifications RS232 COM Port
Serial Port: 9.6Kbps (Async). ASCII / VT100
Power Consumption of T1 Echo Canceller - Stand
Alone (Desk Top Version)
| Input Voltage = 100 - 240 Volt AC |
Current (in Amps.) |
Power Consumption (in Watts) |
|
1 Unit
|
0.15
|
6.0 |
Others Links:
VoIP SS7 and C7 Solution
Quintum Tenor VOIP Gateways
E1 VOIP-GSM Gateway
GSM Gateways / GSM Channel Banks
Echo Cancellers
Digital Access Cross Connect Switch (DACS)
Groomers (Hi-Z Non-Instrusive Monitoring)
Multiplexers
Technical specifications are subject to change without
notice.
All brand names and trademarks are the property of their respective owners.
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