VCL-EC128-T1,
Voice Echo Canceller is a fully integrated 24-channel echo canceller that cancels echo of
up to 128ms. Each of the 24 channels cancels echoes up to 128ms with disable tone
detection and meets ITU-T G.165 and ITU-T G.168 requirements for echo
cancellation. T1 Inputs and T1 Outputs are balanced 100 Ohms, RJ-45.
T1, VCL-EC128, Voice Echo Canceller - Technical Specifications
| Provides voice echo
cancellation of up to 64ms / 128ms, User Selectable |
| Meets ITU-T G.164 and G.165
and G.168 recommendations |
| Non-Linear Processor with
Comfort Noise Insertion |
| Redundant Power Supply
(Optional) |
| T1 Circuit by-pass in the
event of power supply failure |
| Fully integrated
independent 24-channel voice echo canceller |
| Supports Signaling: 23B+D
PRI ISDN (Euro ISDN) , C7, D4 Robbed-Bit, SLC-96 - User Selectable |
T1 Interface at 1544
Kbps
Network Interface
| Number of
Interface |
2,
1 - Input (RJ-45),
1 - Output (RJ-45) |
|
Line Rate |
T1-1.544 Mbps |
|
Line Code |
B8ZS, AMI (User
Selectable) |
| PCM Encoding Law
|
µ Law as per ITU-T
G.711 |
|
Signaling |
Pass-Through
Signaling protocol 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)
- Robbed Bit Signaling.
- All signaling options are USER
SELECTABLE / USER CONFIGURABLE
|
| PCM
Sampling Rate |
8000 Samples / sec. |
| Bit Rate |
1544 Kbps ± 50 ppm |
| Jitter Tolerance |
As per ITU-T G.823 |
| Output
Jitter |
< 0.05 UI (in the
frequency of range of 20Hz to 100Khz) |
| Nominal Line
Impedance |
100 W 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 |
Power
Supply Specifications
| Input DC Voltage |
-48V DC (nominal) |
| Range of Input Voltage |
-40V to -60VDC |
| Output Voltage |
+5V |
| Maximum Full Load Output Current |
10A at +5V |
| Input Voltage Reversal Protection |
Provided in the Card |
| Over Current Protection |
> 10A for +5V |
| Short Circuit Protection |
Current limit - 10A. Recovers on
removal of short |
| Under Voltage |
< 4.5V |
| Over Voltage |
5.4V |
| Efficiency at full load |
>86% |
| Ripple at full load |
<5mVrms |
| Spike at full load |
<50mV |
Management Port Specifications RS232 COM Port
Serial Port: 9.6Kbps (Async). ASCII / VT100 /
HyperTerminal.
10BaseT Ethernet: Telnet
Power Consumption of T1 Echo Cancellers
|
Card in Use |
Current (in Amps.) |
Power Consumption
(in Watts) |
| Input
Voltage = - 48 Volt |
| 1 EC Card + PSU Card
+ NMS Card |
0.15
|
6.0 |
| 10 EC Cards + PSU
Card + NMS Card |
0.825 |
39.6 |
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 |
|
Remote Monitoring and
Control |
Ethernet (10BaseT) interface for remote LAN
Management and Control |
| Local and Remote Provisioning |
CLI (text commands) and GUI |
| Front Panel Indicators |
- In SYNC / Failure
- Individual Card
- LEDs for power on/off |
| Power Supply Redundancy |
Optional: -48V DC Power Supply (1+1) |
| Environmental-Operational |
0° C to 50° C |
| Humidity |
5% to 95%, non-condensing |
Management Port Specifications 10BaseT LAN Management Port (with
Telnet)
|
Network Interface |
RJ-45 Ethernet 10BaseT or 100BaseT-TX (auto sensing) |
|
Compatibility |
Ethernet Version 2.0 IEEE802.3 |
|
Protocols Supported |
ARP, UDP/IP,
TCP/IP, Telnet, ICMP, SNMP, DHCP, BOOTP, TFTP,
Auto IP, SMTP and HTTP
|
|
LEDs |
10Base-T &
100Base-TX Activity, Full / half duplex. |
|
Management |
Serial login,
Telnet login, GUI (Graphical User Interface) |
| EMI
Compliance |
-
Radiated &
conducted emissions - complies with Class B limits of EN 55022:1998
-
Direct &
Indirect ESD - complies with EN55024:1998
-
RF
Electromagnetic Field Immunity - complies with EN55024:1998
-
Electrical
Fast Transient/Burst Immunity - complies with EN55024:1998
-
Power
Frequency Magnetic Field Immunity - complies with EN55024:1998
-
RF Common Mode
Conducted Susceptibility - complies with EN55024:1998
|
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Technical specifications are subject to change without
notice.
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